HAI

This repository contains the core smart contract code for HAI, a GEB fork. GEB is the abbreviation of Gödel, Escher and Bach as well as the name of an Egyptian god.

❱ Getting Started

Welcome to the "Getting Started" guide for the HAI Protocol. If you're new to the system or looking for a concise introduction, you've come to the right place. This section is designed to provide you with a straightforward overview of the essential concepts and steps needed to interact with the HAI ecosystem. Whether you're planning to mint stablecoins, or understand the intricacies of our smart contracts, this guide will equip you with the basic knowledge to take your first steps. Let's dive in!

Introduction to HAI

Introduction to HAI: A Framework for Stablecoin Systems

HAI serves as a framework for creating systems capable of issuing stablecoins. These stablecoins not only act as a reliable source of collateral for other DeFi protocols—when compared to assets like ETH or BTC—but also function as a store of value, complete with an integrated funding rate.

For a comprehensive understanding of the HAI framework, this documentation aims to detail each of its components. We strongly recommend reviewing Reflexer's original whitepaper as a precursor to this documentation.

Core Differentiators of HAI from GEB

HAI is an enhanced fork of GEB, but it comes with several key distinctions:

  • Advanced System Parameter Controls: HAI features refined mechanisms for managing system parameters, offering superior flexibility and control.
  • Enhanced Deployment and Upgradeability: The framework allows for streamlined deployment and upgrades, simplifying system maintenance.
  • Robust Testing and Simulation Suite: HAI includes an upgraded testing and simulation environment, aiding in the identification and mitigation of system risks.
  • Emphasis on Multi-Collateral Operations: HAI is designed with a focus on handling multiple types of collateral, broadening its application scope.
  • Inclusion of Factories for Common Contract Types: The framework comes with pre-built factories for commonly used contract types, reducing the operations needed for collateral setup.
  • Standardized Methods and Contract Utilities: HAI standardizes the way contracts and methods are utilized, making it easier for developers to generate changes across the system.
  • Revamped Contract Interactions: The framework restructures the way contracts communicate with each other, leading to more efficient and reliable operations.

By incorporating these features, HAI aims to provide a more advanced, reliable, and user-friendly stablecoin system.

RedStone Oracles

HAI uses RedStone Oracles as one of its primary solutions for crypto assets pricing. RedStone is a Modular Oracle that delivers frequently updated, reliable, and diverse data feeds in a few models. HAI utilizes Push model which ensures that data is pushed into on-chain storage via a relayer with set conditions. (heartbeat and deviation threshold)

HAI Protocol 101

HAI Framework Mechanics

What is HAI?

  • Low-Cost: The HAI protocol is deployed on the Optimism network, offering significantly low gas fees for transactions.
  • Dollar-Denominated: Both the system coin and the collaterals are denominated in US Dollar.
  • Collateral-Backed: A diverse basket of collateral types backs the minting of the system coin.
  • Control-Pegged: A PID controller dynamically adjusts the funding rate to balance value transfer between minters (debtors) and holders (creditors).
  • Settleable: The system can undergo a Global Settlement, during which all debts are squared and HAI holders can redeem tokens for a share of the collateral pool, regardless of whether they have outstanding debts.

Glossary

Units of Measurement

  • WEI: The base unit for raw ERC20 amounts.
  • WAD: A unit with 18 decimal places, used for representing balances.
  • RAY: A unit with 27 decimal places, utilized for rate computations.
  • RAD: A unit with 45 decimal places, employed for calculating owed amounts.

    Note: The Math Library handles all unit multiplications and divisions.

Tokens

  • systemCoin: The ERC20 stablecoin issued by HAI.
  • protocolToken: The ERC20 governance token, used for system parameter voting and participating in debt/surplus auctions.
  • collateral: Any ERC20 token that serves as collateral, enhancing the corresponding cType balance.

Key Concepts

  • cType: Represents a unique identifier for a collateral type within the HAI system.
  • COIN: An internal balance of system coins convertible to systemCoin on a 1:1 basis.
  • DEBT: An internal ledger entry representing unbacked debt, erasable with COIN on a 1:1 basis.
  • SAFE: A vault-like contract holding collateral and generating COINs, which may also accrue DEBT.
    • lockedCollateral: The collateral amount held within a SAFE.
    • generatedDebt: The debt incurred by a SAFE during the COIN generation process. Note that it does NOT correlate directly to the amount of COINs generated.
    • Liquidation: A process triggered for under-collateralized SAFEs, wherein their generatedDebt is moved to the system's DEBT and collateral is seized for auction to cancel out the DEBT.
  • redemptionPrice: The internal price at which system coins can be exchanged for collateral.
  • targetPrice: A reference price utilized to adjust the redemptionPrice, often aligned with market price.
  • redemptionRate: Governs how the redemptionPrice changes over time, essentially functioning as the system's funding rate.
  • stabilityFee: A separate interest rate, unconnected to the redemptionRate, applied to user debts and collected by the system.
  • accumulatedRate: Reflects the compounded stabilityFee applied to a cType, determining the relationship between generatedDebt and the COINs produced.

This guide aims to provide a comprehensive understanding of HAI's framework and its intricacies. Armed with this knowledge, you'll be better equipped to interact with the protocol effectively.

❱ Core Modules

Welcome to the core contracts that make up the HAI Protocol. This is your go-to resource for understanding the architecture and components that underpin the HAI system. From collateral management and stablecoin issuance to governance and global settlement, these contracts are the building blocks that ensure the protocol's stability, scalability, and security.

Whether you're a developer, a system administrator, or just an enthusiast interested in the mechanics of the HAI Protocol, this index provides detailed information on each core contract and its role within the system. Explore how they interact, understand their functionalities, and learn how they contribute to the robust framework that makes HAI a leader in decentralized finance.

SAFE Engine

See SAFEEngine.sol for more details.

1. Introduction

The SAFE Engine serves as the central component of the HAI framework, managing data on user-owned SAFEs (Simplified Agreement for Future Equity) and the interest rates for different forms of collateral. It performs the following functions:

  • Monitoring the debt generated at the system level, by a specific collateral type, or by individual SAFEs.
  • Facilitating the internal movement of coins, collateral, or debt between accounts.
  • Seizing collateral from SAFEs, usually during liquidation events.
  • Managing account permissions.
  • Implementing debt caps on a global scale, as well as for each type of collateral and individual SAFE.

Users have the ability to alter the status of their SAFEs via the SAFE Engine, provided that the collateralization ratio remains above the designated minimum threshold.

Notice: The SAFE Engine relies on join adapter contracts to hold the balance of ERC20 tokens of the system. Transfers within the system are handled entirely by the SAFE Engine, which does not handle any ERC20 tokens directly.

2. Contract Details

Key Methods:

Permissioned

  • transferCollateral: Transfers collateral from one account to another.
  • transferInternalCoins: Transfers coins from one account to another.
  • transferSAFECollateralAndDebt: Transfers collateral and debt from one SAFE to another.
  • modifySAFECollateralization: Locks/Releases collateral in a SAFE, and/or generates/repays a SAFE's debt.

Authorized

  • updateCollateralPrice: Updates the prices of a collateral type.
  • updateAccumulatedRate: Updates the accumulated rate of a collateral type.
  • modifyCollateralBalance: Modifies the collateral balance of an account.
  • confiscateSAFECollateralAndDebt: Confiscates collateral and debt from a SAFE.
  • disableContract: Locks the SAFEs, accumulated rates, and collateral prices from being modified.

Required Authorities:

  • Oracle Relayer: needs authorization to call updateCollateralPrice.
  • Tax Collector: needs authorization to call updateAccumulatedRate.
  • Liquidation Engine: needs authorization to call confiscateSAFECollateralAndDebt.
  • Coin Join: needs authorization to call transferInternalCoins.
  • Collateral Join: needs authorization to call modifyCollateralBalance.
  • Global Settlement: needs authorization to call disableContract.

Contract Parameters:

Global

  • globalDebtCeiling: The max amount of debt that can be generated by the system.
  • safeDebtCeiling: The max amount of debt that can be generated by a SAFE.

Per Collateral Type

  • debtCeiling: The max amount of debt that can be generated globally by the collateral type.
  • debtFloor: The min amount of debt that can be generated by a SAFE of that collateral type.

Contract Data:

Global

  • globalDebt: The amount of debt that was generated by the system.
  • globalUnbackedDebt: The amount of debt that was generated by the system and is not backed by collateral.

Per Collateral Type

  • debtAmount: The amount of debt that was generated by the collateral type.
  • lockedAmount: The amount of collateral that is locked in all SAFEs using the collateral type.
  • accumulatedRate: A value that represents the accumulated interest rate.
  • safetyPrice: The price of the collateral type (vs HAI) at which the SAFE is considered unsafe.
  • liquidationPrice: The price of the collateral type (vs HAI) at which the SAFE is considered liquidatable.

A user action should never be able to modify the SAFE collateralization resulting in an unsafe state. When an update the safetyPrice leaves the SAFE in an unsafe state, the user may only add collateral and/or repay debt in order to restore the SAFE's collateralization to a safe state.

Notice: The lockedAmount is a storage variable used to visibilize the total amount of collateral that backs the debtAmount. However, this value can be artificially increased, by creating a SAFE without debt and locking collateral in it: on the event of Global Settlement, this user would be allowed to withdraw all of his collateral and it would not be accounted for the redemptions.

3. Key Mechanisms & Concepts

ACCOUNTs vs SAFEs

The SAFE Engine handles 2 different types of entities:

  • ACCOUNTs:
    • May have coins and collateral (non confiscatable) balance
    • May have SAFEs (one for each collateral type)
    • May have authorized accounts to modify their balance (or SAFEs)
    • May have in some cases (unbacked) debt (confiscatable)
  • SAFEs:
    • Defined by the account's address (owner) and a collateral type
    • May only have locked collateral and generated debt
    • May be modified by the owner account, or by authorized accounts

Notice: The protocol may be able to confiscate collateral from SAFEs, but not from ACCOUNTs, all debt generated to ACCOUNTs has is considered unbacked. Core contracts of the protocol may have debt, and they should try to settle it by destroying COINs in their balance.

The Collaterals & SAFEs Accountances

A SAFE consists of the following information:

  • account: The address of the owner.
  • collateralType: The collateral type identifier.
  • generatedDebt: The amount of debt that was generated.
  • lockedCollateral: The amount of collateral that is locked in.

The SAFE Engine also tracks per collateral type the following information:

  • accumulatedRate: A value that represents the accumulated interest rate.
  • safetyPrice: The price of the collateral type (vs HAI) at which the SAFE is considered unsafe.
  • liquidationPrice: The price of the collateral type (vs HAI) at which the SAFE is considered liquidatable

A SAFE is considered healthy when the following condition is met:

lockedCollateral * safetyPrice >= generatedDebt * accumulatedRate

COIN, DEBT, and HAI Dynamics

In this system, COINs and DEBT function similarly to matter and antimatter, created and annulled in pairs. The HAI token acts as the ERC20 counterpart of a COIN when it's outside the system, maintaining a redeemable 1:1 ratio. The system enables users to lock COINs to mint HAI or burn HAI to unlock COINs, making them operable within the framework.

DEBT, when unsecured, can be nullified using COINs on a 1:1 basis. However, within SAFEs, the relationship between generatedDebt and generated COINs diverges from the 1:1 ratio.

Interest Accumulation

The "accumulated rate" represents the constantly accumulating interest or fees on the outstanding HAI-generated debt. Calculated over time, it's based on the amount of HAI minted and the applicable stability fee rate. This ensures that the debt owed by users evolves due to the ongoing addition of the stability fee. Whenever a user mints or repays HAI, the formula for generatedDebt is:

coinAmount = generatedDebt * accumulatedRate

Here, coinAmount is the number of coins the user wishes to mint or burn, and accumulatedRate is the relevant collateral's accumulated interest rate. The coinAmount could also be a negative figure, indicating debt dissolution.

Example: Assume a 10% annual interest rate on collateral TKN.

Initially, the accumulatedRate is 1. When Alice mints 100 HAI tokens (COINs) from the SAFE Engine, her resulting debt is 100 * 1 = 100.

After one year, Alice repays her 100 debt. Now, the accumulatedRate stands at 1.1, requiring Alice to repay 100 * 1.1 = 110 HAI tokens.

Concurrently, Bob mints 100 HAI, resulting in a (100 / 1.1) 90.9 debt.

By year two, the accumulatedRate becomes 1.21. To repay his debt, Bob needs 90.9 * 1.21 = 110 HAI tokens, identical to Alice's amount.

Note: Negative interest rates could technically be implemented using the same mechanics.

Whenever the system refreshes the accumulatedRate, it leads to a surplus of COINs that get allocated to an unspecified address. This surplus emerges from the updateAccumulatedRate function, invoked by the Tax Collector. Importantly, these additional COINs are not directly extracted from any SAFE; instead, they manifest as a simultaneous debt increment for all SAFEs holding the taxed collateral type.

Transfer Collateral and Coins events

Since the transfer of collateral and coins is handled by the SAFE Engine, the events TransferCollateral and TransferInternalCoins are emitted by the SAFE Engine, and not by the ERC20 contracts. The events emitted by the SAFE Engine try to follow the same structure as the ERC20 events, but with the addition of the collateral type identifier in the TransferCollateral event.

Generating Debt and minting HAI:

  • Lock collateral in a SAFE:
    • Deposit TKN: TransferCollateral(TKN, source, ACCOUNT, amount)
    • Lock TKN:
      • TransferCollateral(TKN, ACCOUNT, 0, amount)
      • TransferCollateral(TKN, 0, SAFE, amount)
    • Generate DEBT: TransferInternalCoins(0, ACCOUNT, amount)
    • Mint HAI:
      • TransferInternalCoins(ACCOUNT, COIN_JOIN, amount)
      • ERC20.Transfer(0, destination, amount)

4. Gotchas

Permissioned vs Authorized

Authorized accounts are addresses allowed to call SAFE Engine isAuthorized methods. While a SAFE can add approval to an account, which gives permission to the account to modify the SAFE's state (on isSAFEAllowed methods), this account is not authorized to call SAFE Engine authorized methods (isAuthorized).

SAFE State vs COIN and DEBT

The generatedDebt and lockedCollateral of a SAFE is measured in WAD units, while the COINs and DEBT (that gets limited, for example, by the debt ceilings) are measured in RAD units.

Notice: The reason for this is that the resultant COIN|DEBT is calculated by:

generatedDebt[WAD] * accumulatedRate[RAY] = COIN|DEBT[RAD]

Collateral Balance vs Locked Collateral

As stated before, an ACCOUNT can have collateral balance, and an account's SAFE can have locked collateral. The difference between these two is that the collateral balance is the amount of collateral that the user has available to use (transfer or withdraw), and the locked collateral is the amount of collateral that the user has locked in a SAFE, that the user would need to modify the SAFE collateralization in order to use.

Unbacked Debt and Debt Settlement

Unbacked debt, or debt that is accounted to an ACCOUNT (not a SAFE with locked collateral) is only generated to contracts of the protocol. This debt can only be settled by having an equal an equal amount of COINs in the ACCOUNT's balance, and calling settleDebt with the amount of DEBT/COINs to destroy.

This debt is only generated when a SAFE gets liquidated, a portion of the SAFE's collateral is transferred to the Collateral Auction House, the SAFE's debt is transferred to the Accounting Engine (unbacked). The Auction House will the transfer COINs to the Accounting Engine in order for the debt to be settled.

Confiscation of Collateral and Debt

An authorized account may call confiscateSAFECollateralAndDebt to confiscate the locked collateral and/or debt of a SAFE. This method does not perform any checks on the SAFE's state. The flow of value is inversed when it happens during liquidations, than when the system is under global settlement. This means that this method is always authorized to arbitrarily modify the SAFE's state (and the DEBT balance of an account), even after the system was shutdown.

5. Failure Modes

Parameters misconfiguration

  • Low globalDebtCeiling may limit user borrowing.
  • High globalDebtCeiling risks debt overload.
  • Low safeDebtCeiling hampers individual borrowing.
  • safeDebtCeiling above globalDebtCeiling is likely moot.
  • Low cType.debtCeiling curbs borrowing for specific collateral.
  • cType.debtCeiling above globalDebtCeiling is typically irrelevant.
  • Low cType.debtFloor raises liquidation risks.
  • High cType.debtFloor deters small borrowers.

Liquidation mechanics

Despite the fact that the SAFE Engine holds the latest collateral prices and SAFE state, the liquidation of a SAFE is handled by the Liquidation Engine. The Liquidation Engine is authorized to call confiscateSAFECollateralAndDebt, which doesn't perform healthy checks, and allows it to modify the SAFE's state in an arbitrary way. If the Liquidation Engine (or any authorized address) is misconfigured, it may result in the liquidation of SAFEs that are not unsafe, or malicious modifications to any SAFE's state.

Accumulated Rate and Collateral Prices

Both the updateAccumulatedRate and updateCollateralPrice are authorized methods that perform no further checks in the validity of the parameters passed. If the Oracle Relayer or the Tax Collector (or any other authorized address) are misconfigured, it may result in the accumulatedRate or safetyPrice being set to an arbitrary value.

If the accumulatedRate for a given collateral type is set to 0, the collateral type may be bricked beyond repair, as the accumulatedRate is iteratively calculated by multiplying the previous value to a multiplier.

Accounting Engine

See AccountingEngine.sol for more details.

1. Introduction

The Accounting Engine serves as the system's financial management hub, overseeing tasks such as:

  • Tracking system surplus and deficit.
  • Managing system debt through auctions.
  • Dealing with system surplus via auctions or transfers.
  • Accepting COINs (for instance, from auctions) and using them to offset DEBT.

2. Contract Details

Key Methods:

Public

  • popDebtFromQueue: Removes a certain amount of debt from the time-sensitive queue after the popDebtDelay duration has elapsed, for either settlement or auction.
  • settleDebt: Utilizes coin balance to settle debt.
  • cancelAuctionedDebtWithSurplus: Utilizes coins to settle debt that's in the queue.
  • auctionDebt: Triggers an auction to liquidate portions of unsettled debt.
  • auctionSurplus: Triggers an auction to liquidate surplus once all debt has been settled.
  • transferExtraSurplus: Allocates (instead of auctioning it) excess surplus following debt settlement.
  • transferPostSettlementSurplus: Allocates all remaining surplus when a Global Settlement event occurs.

Authorized

  • pushDebtToQueue: Adds a specified amount of debt to a time-sensitive queue.
  • disableContract: Deactivates both Debt and Surplus Auction Houses, clears as much debt as possible, and transfers (after disableCooldown delay) any leftover surplus to a designated drain address.

Required Authorities:

  • LiquidationEngine: needs authorization to call pushDebtToQueue.
  • Debt Auction House: needs authorization to call cancelAuctionedDebtWithSurplus.
  • Surplus Auction House: needs approval to modify the contract's state in the SAFE Engine.
  • Global Settlement: needs authorization to call disableContract.

Contract Parameters:

Global

  • SAFE Engine: Holds the coin and debt balance, is called to settle debt.
  • Surplus Auction House: Is called to start surplus auctions.
  • Debt Auction House: Is called to start debt auctions.
  • postSettlementSurplusDrain: Address to which surplus is sent following Global Settlement.
  • surplusIsTransferred: Whether the surplus should be either auctioned off or transferred.
  • surplusDelay: Time lag before the surplus becomes eligible for either auction or transfer.
  • popDebtDelay: Time interval after which debt can be popped from the time-sensitive queue.
  • disableCooldown: The waiting period following Global Settlement, after which any remaining surplus should be transferred.
  • surplusAmount: Amount of surplus eligible for auction or transfer during each operation.
  • surplusBuffer: Minimum surplus reserve to be maintained in the contract following an auction or transfer.
  • debtAuctionMintedTokens: Initial quantity of Protocol Tokens offered for minting in debt auctions.
  • debtAuctionBidSize: Chunk of debt that can be offered in each individual debt auction.

3. Key Mechanisms & Concepts

Queued Debt, On Auction Debt & Unqueued Unauctioned Debt

Within the SAFE Engine's scope, the Accounting Engine maintains a single debt balance associated with the contract address. This balance is the summation of three components: the queued debt, representing debt in line for auctioning; the unqueued debt, which is currently being auctioned; and the remaining debt not undergoing auction at the moment.

The unqueued-unauctioned debt can be calculated as follows:

unqueuedUnauctionedDebt = debtBalance - queuedDebt - onAuctionDebt

Once the unqueuedUnauctionedDebt debt reaches the specified debtAuctionBidSize threshold and the cooldown period elapses, a debt auction is initiated. During this process, the overall debt of the contract remains unchanged, but the onAuctionDebt metric increases as the debt enters the auction phase. Simultaneously, the calculation for unqueuedUnauctionedDebt decreases as the debt undergoing auction is accounted for.

4. Gotchas

Unqueued Unauctioned Debt underflow

The queuedDebt is modified through the pushDebtToQueue (authorized) and popDebtFromQueue (public) methods. They don't exclusively mirror the debtBalance recorded in the SAFE Engine. If an authorized contract uses pushDebtToQueue without transferring debt to the Accounting Engine, it could lead to an underflow issue (if queuedDebt exceeds debtBalance). This situation could potentially disrupt the contract's ability to auction debt as the unqueuedUnauctionedDebt calculation might underflow and revert.

5. Failure Modes

Parameters misconfiguration

  • High surplusDelay slows surplus actions.
  • Low surplusDelay rushes surplus auctions.
  • High popDebtDelay delays debt auctions.
  • Low popDebtDelay risks double debt coverage.
  • High surplusAmount risks unfilled surplus auctions.
  • Low surplusAmount hampers surplus actions.
  • High surplusBuffer blocks surplus auctions.
  • Low surplusBuffer risks uncovered new debt.
  • High debtAuctionMintedTokens dilutes protocol tokens.
  • Low debtAuctionMintedTokens risks failed debt auctions.
  • High debtAuctionBidSize risks unfilled debt auctions.
  • Low debtAuctionBidSize slows debt auctions.
  • Low shutdownCooldown risks premature surplus moves.
  • High shutdownCooldown delays post-shutdown surplus actions.

Post Settlement Surplus Drain misconfiguration

The postSettlementSurplusDrain address should be configured after the system is deployed. It's permissible to leave it unset, but doing so comes with implications: if Global Settlement is activated while this address is not specified, any surplus remaining after the settlement won't be drained. Instead, this surplus can only be used for debt elimination. It's worth noting that once Global Settlement is triggered, the address for postSettlementSurplusDrain becomes immutable and can't be changed.

Liquidation Engine

See LiquidationEngine.sol for more details.

1. Introduction

The Liquidation Engine is the component responsible for managing the liquidation processes of SAFEs. Its primary duties include:

  • Determining the liquidation status of a SAFE.
  • Initiating a SAFE Saviour action to enhance the SAFE's financial health, if applicable.
  • Assessing the amount of collateral required to be confiscated from a SAFE to offset its debt.
  • Activating the process to seize collateral from a SAFE.
  • Initiating collateral auctions.

2. Contract Details

Key Functions:

Public

  • liquidateSAFE: Evaluates the condition of a SAFE and commences the liquidation process if the SAFE is eligible for liquidation (and if SAFE Saviour intervention fails).

Permissioned

  • protectSAFE: Selects a SAFE Saviour to defend a SAFE against liquidation.

Authorized

  • connectSAFESaviour: Permits a SAFE Saviour contract to associate with a SAFE for the purpose of preventing its liquidation.
  • disconnectSAFESaviour: Revokes permission for a SAFE Saviour contract to be linked to SAFEs.
  • removeCoinsFromAuction: Adjusts the accounted amount of coins that are currently under auction.

Required Authorities:

  • Collateral Auction Houses: need authorization to call removeCoinsFromAuction.
  • Global Settlement: needs authorization to call disableContract (and block further liquidations).

Contract Parameters:

Global

  • SAFE Engine: Holds the SAFE state, is called to confiscate the SAFE collateral and debt.
  • Accounting Engine: The confiscated debt is transferred to the Accounting Engine balance, and pushed to its queue to be auctioned.
  • onAuctionSystemCoinLimit: Maximum amount of system coins that can be simultaneously auctioned.

Per Collateral Type

  • Collateral Auction House: Is called to start collateral auctions.
  • liquidationPenalty: Penalty applied to the debt of the SAFE that is being liquidated. This penalty represents an excess in the amount of debt that the collateral auction needs to cover.
  • liquidationQuantity: Max amount of debt that can be liquidated in each liquidation.

3. Key Mechanisms & Concepts

Liquidation Penalty

If a SAFE is subject to liquidation carrying a specific debt amount, the Liquidation Engine initiates a collateral auction. The target debt to be covered in the auction is determined by the following equation:

debtToAuction = debtToCover * liquidationPenalty

Example: Alice has a SAFE with 1000 TKN locked and a 500 COINs debt. The TKN price drops, and Alice's SAFE gets liquidated. The liquidation penalty is 1.1, so the collateral auction will auction off Alice's 1000 TKNs, to try to cover 550 COINs of debt.

Liquidation Quantity

The quantity of collateral and debt seized from a SAFE during liquidation is decided based on the following criteria:

  • If the SAFE's debt is smaller than liquidationQuantity, the SAFE undergoes full liquidation.
  • If the SAFE's debt surpasses liquidationQuantity, the SAFE is only partially liquidated, and residual debt remains.
  • If the SAFE's outstanding debt crosses the onAuctionSystemCoinLimit, partial liquidation occurs, and any remaining debt stays in the SAFE.
  • In cases of partial liquidation, a corresponding slice of collateral is seized, leaving the remaining collateral intact within the SAFE.

SAFE Saviours

These are smart contracts authorized to intervene on a user's behalf to improve the SAFE's financial condition and prevent liquidation. To become operational, SAFE Saviour contracts must receive authorization and must be chosen by each individual user.

4. Gotchas

System Coin Limit

This parameter establishes a shared upper limit for the total quantity of coins—equivalent to debt—that can be simultaneously auctioned for all kinds of collateral. Once this collective cap is reached, no additional debt auctions can occur, regardless of the type of collateral in question.

Reaching this ceiling can set off a chain reaction of consequences. For example, if a specific collateral type is unusually volatile and maxes out the debt limit through numerous auctions, it could essentially monopolize the available auction capacity, preventing other types of collateral from being auctioned. Furthermore, reaching this ceiling can freeze all new collateral auctions, affecting the liquidity and stability of the system until remedial actions are taken.

Therefore, it's vital for both users and system administrators to closely monitor how near the system is to hitting the onAuctionSystemCoinLimit. Breaching this limit could disrupt a wide range of operations.

Notice: The onAuctionSystemCoinLimit is a number with RAD precision.

5. Failure Modes

Parameters misconfiguration:

  • High onAuctionSystemCoinLimit risks mass collateral liquidation.
  • Low onAuctionSystemCoinLimit slows SAFE liquidations.
  • High liquidationPenalty amplifies user losses.
  • Low liquidationPenalty encourages overleveraging.
  • High liquidationQuantity favors full SAFE liquidations.
  • Low liquidationQuantity makes small auctions gas-inefficient.

Oracle Relayer

See OracleRelayer.sol for more details.

1. Introduction

The Oracle Relayer is the module that handles the quoting mechanism of the system. It is responsible for the following:

  • Storing the oracles addresses for each collateral type.
  • Fetching and updating the price of the collateral types.
  • Updating the redemption price, given the redemption rate.

2. Contract Details

Key Methods:

Public

  • marketPrice: Gets the market price of the system coin.
  • redemptionPrice: Gets and updates the redemption price.
  • calcRedemptionPrice: View method that calculates (but does not update) the current redemption price.
  • updateCollateralPrice: Fetchs the price of a collateral type, updates the redemption price, calculates the safety and liquidation prices, and updates them in the SAFE Engine.

Authorized

  • updateRedemptionRate: Updates the redemption rate.

Required Authorities:

  • PID Rate Setter: needs authorization to call updateRedemptionRate.

Contract Parameters:

Global

  • SAFE Engine: Is called to update the collateral prices on it.
  • System Coin Oracle: Is queried to fetch the market price of the system coin.
  • redemptionRateLowerBound: Lower bound of the redemption rate.
  • redemptionRateUpperBound: Upper bound of the redemption rate.

Per Collateral Type

  • Oracle: Is queried to fetch the price of the collateral type.
  • safetyCRatio: Ratio applied to the collateral price to define the safety price.
  • liquidationCRatio: Ratio applied to the collateral price to define the liquidation price.

3. Key Mechanisms & Concepts

Quoting Mechanism

Each collateral type needs to have an associated oracle that quotes the collateral in terms of the denomination currency (in HAI, US Dollars). The System Coin Oracle needs to be also denominated in the same currency.

The Oracle Relayer handles the quoting mechanism, in which collateral types are quoted in terms of HAI, applying a variable rate to HAI price. The collateral price is calculated as follows:

collateralPrice = oraclePrice / redemptionPrice

C Ratios

Safety and liquidation prices are calculated by applying a ratio to the collateral price. The safety price is calculated as follows:

safetyPrice = collateralPrice * safetyCRatio
liquidationPrice = collateralPrice * liquidationCRatio

The safety price is the price at which the SAFE is considered safe, a user may modify the SAFE collateralization as long as the resulting state is above the safety price.

The liquidation price is the price at which the SAFE is considered liquidatable, and the SAFE may be liquidated.

4. Gotchas

5. Failure Modes

Parameters misconfiguration:

  • High safetyCRatio limits SAFE modifications.
  • safetyCRatio near liquidationCRatio makes it redundant.
  • High liquidationCRatio may cause needless liquidations.
  • Low liquidationCRatio encourages overleveraging.

Tax Collector

See TaxCollector.sol for more details.

1. Introduction

The Tax Collector is the module that handles the collection of taxes. It is responsible for the following:

  • Storing the interest rate for each collateral type.
  • Storing the tax revenue receivers.
  • Calculating and distributing the tax revenue.

2. Contract Details

Key Methods:

Public

  • taxSingle: Calculates and distributes the tax revenue for a single collateral type.
  • taxMany: Calculates and distributes the tax revenue for a set of collateral types.

Contract Parameters:

Global

  • SAFE Engine: Is called to update the accumulated rate for each collateral type.
  • Primary Tax Receiver: Receives tax revenue for all collateral types.
  • globalStabilityFee: Global stability fee applied to all collateral types.
  • maxStabilityFeeRange: Maximum range for the stability fee to differ from 1 (no fee).

Per Collateral Type

  • Secondary Tax Receivers: Addresses (and tax percentage) that receive revenue for the collateral type total stability fees.
  • stabilityFee: Stability fee applied only to the collateral type.

3. Key Mechanisms & Concepts

Primary and Secondary Tax Receivers

The contract holds 2 types of tax receivers:

  • Primary Tax Receiver: Is a shared address across all the collateral types. It receives the remaining tax revenue after the secondary tax receivers have been paid.
  • Secondary Tax Receivers: Is a set of addresses per collateral type, that can be set to receive a fixed percentage amount of the tax revenue of the collateral type.

Global and Per Collateral Stability Fees

The tax (or Stability Fee) can be configured in 2 ways:

  • Global Stability Fee: Shared across all the collateral types.
  • Per Collateral Stability Fee: Set for each collateral type.

The final stability fee computed for a collateral type is the multiplication of both fees. To avoid retroactivity, the tax collecting routine first reads the previously stored stability fee, and then calculates and stores the new one.

4. Gotchas

5. Failure Modes

Parameters misconfiguration:

  • maxStabilityFeeRange too high may result in a bad calculation of the stability fee, resulting in broken collateral types (as their accumulated rate will be too low/high).
  • maxStabilityFeeRange too low may result in a bounded value for the stability fee, bounding the final stability fee to a value very similar to 1 (no stability fee).
  • maxSecondaryTaxReceivers too low may result in not being able to add a secondary tax receiver to a collateral type.
  • Stability fees (global * perCollateral) too high may result in users not interested in generating debt.
  • Stability fees too low may result in the protocol not being able to generate enough revenue to cover the system expenses.

PID Controller

See PIDController.sol and PIDRateSetter.sol for more details.

1. Introduction

The PID Controller is a smart contract that fine-tunes the system's redemption rate by analyzing the deviation, which is the discrepancy between the market and redemption prices. It performs the following tasks:

  • Computes and stores the system's proportional and integral deviations.
  • Applies a decay factor to the integral deviation.
  • Adjusts the redemption rate by applying proportional and integral gains to the deviation.

The PID Rate Setter schedules and triggers the PID Controller's redemption rate adjustments.

2. Contract Details

2.1 PID Controller

Key Methods:

Authorized

  • computeRate: Computes the new redemption rate, applying the proportional and integral gains to the deviation (can only be called by the PID Rate Setter contract).

Contract Parameters:

  • Seed Proposer: Authorized address for initiating redemption rate updates.
  • integralPeriodSize: Minimum duration required to calculate integral deviation.
  • perSecondCumulativeLeak: Decay constant for the integral deviation.
  • noiseBarrier: Lowest deviation percentage considered for redemption rate adjustment.
  • feedbackOutputUpperBound: Maximum limit for the redemption rate.
  • feedbackOutputLowerBound: Minimum limit for the redemption rate.
  • proportionalGain: Gain factor for proportional deviation.
  • integralGain: Gain factor for integral deviation.

2.2 PID Rate Setter

Key Methods:

Public

  • updateRate: Retrieves market and redemption prices from the Oracle Relayer and prompts the PID Controller to compute the new redemption rate.

Contract Parameters:

  • updateRateDelay: Time gap between successive redemption rate adjustments.

3. Key Mechanisms & Concepts

Deviation Metrics

The PID Controller monitors the gap between market and redemption prices and stores both the proportional and integral deviations. Whenever the deviation changes, its integral component is decayed to mitigate the impact of historical deviations on future rates.

Proportional Deviation (pTerm)

It is computed as:

pTerm = (redemptionPrice - marketPrice) / redemptionPrice

Integral Deviation (iTerm)

It is calculated iteratively:

iTerm_n = (iTerm_(n-1) * decayFactor) + ((pTerm_n - pTerm_(n-1)) / 2)

Gain Parameters

The system owner can configure the gain parameters for proportional (pGain) and integral (iGain) deviations. The redemption rate is then adjusted as follows:

redemptionRate = 1 + (pTerm * pGain + iTerm * iGain)

Notice: All of pTerm, iTerm, pGain, iGain can be negative, so the redemption rate can be lesser than 1 (decrease the rate). Yet the redemption rate can never be 0 or negative.

4. Gotchas

5. Failure Modes

  • Invalid seedProposer risks stale redemption rate.
  • High noiseBarrier hampers redemption rate adjustment.
  • High integralPeriodSize lowers PID responsiveness.
  • Over-the-top feedbackOutputUpperBound is likely disregarded.
  • Null feedbackOutputUpperBound constrains positive control range.
  • Excessive feedbackOutputLowerBound may be overlooked.
  • Null feedbackOutputLowerBound limits negative control range.
  • High perSecondCumulativeLeak quickens integral decay.
  • Low perSecondCumulativeLeak amplifies integral's historical effect.
  • High kp makes controller jittery to current deviations.
  • High ki overemphasizes historical deviations.

Stability Fee Treasury

See StabilityFeeTreasury.sol for more details.

1. Introduction

The Stability Fee Treasury functions as a specialized contract designed for managing protocol fees that are not factored into the system's surplus or deficit calculations. Unlike locked funds, the funds within this contract remain liquid and can be flexibly utilized by the system owner. Its key responsibilities encompass:

  • Facilitating the disbursement of rewards for maintenance tasks.
  • Utilizing funds to address unbacked debt.
  • Managing diverse payments initiated by the system owner.
  • Replenishing the system's surplus/deficit sheets when the treasury surpasses its predefined capacity.

2. Contract Details

Key Methods:

Public

  • settleDebt: This function efficiently allocates available funds to cover unbacked debt within the treasury's accounting.
  • transferSurplusFunds: This operation addresses outstanding debt to the maximum extent achievable and transfers any excess funds beyond the capacity back to the system's surplus/deficit sheets.

Permissioned

  • takeFunds: Enables the authorized withdrawal of funds from a consenting address to the treasury.
  • pullFunds: Allows an address with sufficient allowance to withdraw funds from the treasury.

Authorized

  • setTotalAllowance: Grant an address the permission to withdraw funds from the treasury up to a specified limit.
  • setPerHourAllowance: Assign a per-hour withdrawal limit to an address, allowing them to pull funds from the treasury within this constraint.
  • giveFunds: Move funds from the treasury to a designated address.
  • disableContract: Swiftly transfer all available funds from the contract to a predetermined drainage address.

Required Authorities:

  • Global Settlement: needs authorization to call disableContract.

Contract Parameters:

  • SAFEEngine: Query and settle the treasury's coin and debt balance.
  • Extra Surplus Receiver: Who receives the funds that are above the treasury's capacity (usually Accounting Engine).
  • CoinJoin: Used to join ERC20 HAI into the system.
  • treasuryCapacity: Maximum amount of funds that the treasury can hold (before transferring to the extra surplus receiver).
  • pullFundsMinThreshold: Minimum amount of funds that the treasury must hold to be able to pull funds from it.
  • surplusTransferDelay: Minimum delay between transfers of funds to the extra surplus receiver.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

❱ Auction Houses

Introduction

Auction Houses are core smart contracts in the HAI Protocol that manage debt, surplus, and collateral through automated auctions. Whether you're an active participant or simply interested in HAI's stability mechanisms, understanding these components is crucial.

Types of Auction Houses

  1. Collateral Auction House: Facilitates the sale of confiscated collateral from liquidated SAFEs, aiming to cover associated debts.
  2. Debt Auction House: Auctions off the system's debt, offering to mint Protocol Tokens as rewards for debt settlement.
  3. Surplus Auction House: Manages system surplus, conducting auctions (Protocol Tokens buybacks) to distribute excess funds.

Understanding these mechanisms is essential for navigating the HAI Protocol's automated balance and risk management features.

Collateral Auction House

See CollateralAuctionHouse.sol for more details.

1. Introduction

The Collateral Auction House plays a crucial role in maintaining the stability of the HAI Protocol by handling the auction of collateral seized from undercollateralized SAFEs. The primary objective is to convert this confiscated collateral into system coins, which are then forwarded to the Accounting Engine for debt destruction.

The Collateral Auction House utilizes an increasing discount model. This encourages early bidding by incrementally increasing the discount applied to the collateral over time. The rationale behind this is to expedite the auction process and ensure that debts are covered as swiftly as possible.

2. Contract Details

Key Methods:

Public

  • buyCollateral: Enables holders of the system coin to participate in auctions by purchasing available collateral.

Authorized

  • startAuction: Initiates a new collateral auction for the contract's specific collateral type.
  • terminateAuctionPrematurely: Allows for the early termination of an ongoing auction, with any remaining collateral allocated to the caller's address.

Contract Parameters

  • Liquidation Engine Address: Specifies the address of the Liquidation Engine, the module responsible for handling the on-auction system coin limit.
  • Oracle Relayer Address: Specifies the address of the Oracle Relayer, responsible for providing up-to-date price information.
  • minimumBid: Sets the minimum system coin bid required to participate in collateral auctions.
  • minDiscount: Defines the initial discount rate at which auctions commence.
  • maxDiscount: Sets the upper limit for the discount rate that auctions can achieve.
  • perSecondDiscountUpdateRate: Determines the rate at which the discount increases for each second the auction is live.

3. Key Mechanisms & Concepts

Collateral Price Feed and Discount Model

The Collateral Auction House relies on the system's collateral price feed to determine the current market price of the collateral in terms of system coins. Upon establishing this baseline, the contract employs a dynamic discount model to calculate the auction price of the collateral. Here's how the discount model works:

  • Initial Discount: Each auction kicks off with a predefined minimum discount. This discount is set by the minDiscount parameter.

  • Per-Second Discount Rate: The contract features a rate at which the discount increases on a per-second basis. This rate is determined by the perSecondDiscountUpdateRate parameter.

  • Maximum Discount Cap: Once the auction reaches the maximum allowable discount, as defined by the maxDiscount parameter, the auction remains at this discount level until either all the collateral is bought or the auction is prematurely terminated.

This approach ensures that the auction starts incentivizing early bids but also allows for adjustments over time, ultimately facilitating efficient price discovery and collateral liquidation.

4. Gotchas

5. Failure Modes

Debt Auction House

See DebtAuctionHouse.sol for more details.

1. Introduction

The Debt Auction House contract plays a crucial role in the protocol by managing and auctioning off bad debt. To achieve this, the contract mints protocol tokens, which are auctioned off to users in exchange for system coins. These system coins are then used to annihilate the corresponding bad debt from the system.

The Debt Auction House utilizes a descending bidding model. In this model, a predetermined amount of debt is up for auction. Participants bid by specifying how many protocol tokens they are willing to accept in exchange for taking on this debt. As the auction progresses, the number of protocol tokens a bidder is willing to accept decreases, leading to a more favorable exchange rate for the protocol.

This system ensures that bad debts are efficiently cleared from the protocol, while also incentivizing participants to compete for the most favorable exchange rates.

2. Contract Details

Key Methods:

Public

  • restartAuction: Allows for the resumption of an expired auction that has received no bids. This restarts the auction and increases the initial quantity of protocol tokens to be minted as an incentive for participation.
  • decreaseSoldAmount: Enables users to participate in the auction by bidding. System coins are transferred during this operation.
  • settleAuction: Finalizes an auction, distributing the protocol tokens to the winning bidder.
  • terminateAuctionPrematurely: Ends an auction before its scheduled completion. This method creates an unbacked debt entry in the Accounting Engine and returns the system coins to the highest bidder. Note that this action can only be performed when the contract is disabled.

Authorized

  • startAuction: Initiates a new debt auction.

Contract Parameters:

  • Accounting Engine: The address of the Accounting Engine contract that handles the system's financial records.

These methods and parameters provide a comprehensive control structure for managing bad debt through auctions, balancing both protocol and user interests.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

Surplus Auction House

For more details, refer to the SurplusAuctionHouse.sol contract.

1. Introduction

The Surplus Auction House is tasked with auctioning the system's surplus coins in exchange for protocol tokens. A fraction of these protocol tokens is burnt to create a deflationary effect, while the rest is transferred to a specified target address. The auction employs an ascending bidding model: a fixed number of system coins are up for auction, and participants bid by offering increasingly higher amounts of protocol tokens.

2. Contract Details

Key Methods:

Public

  • increaseBidSize: Enables users to participate in the auction by offering higher amounts of protocol tokens, which are transferred during this operation.
  • restartAuction: Resets an expired auction that has not received any bids, making it available for new bids.
  • settleAuction: Finalizes the auction, transferring the system coins to the winning bidder.
  • terminateAuctionPrematurely: Aborts an auction before its scheduled completion. This action returns the protocol tokens to the highest bidder but is only possible when the contract is deactivated.

Authorized

  • startAuction: Initiates a new surplus auction.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

❱ Settlement

The Settlement Module serves as a critical component in the lifecycle of the HAI protocol, governing its shutdown and the subsequent redemption of HAI tokens for underlying collateral. It activates in circumstances that necessitate the halting of the system—such as critical bugs, governance decisions, or market anomalies—to ensure a smooth and orderly unwinding of positions. The module's primary objective is to provide a transparent and fair mechanism for redeeming HAI tokens, thereby ensuring the protocol's integrity even in its termination phase.

Global Settlement

See GlobalSettlement.sol for more details.

1. Introduction

The Global Settlement contract serves as the emergency brake and ultimate wind-down mechanism for the system. Its responsibilities include:

  • Triggering the System Shutdown: Initiating the process to safely halt all operations.
  • Processing SAFEs: Settling all Secure, Automated, Flexible, and Efficient (SAFE) accounts to determine each collateral's deficits and surplus.
  • Terminating Auctions: Bringing all ongoing auctions to a premature end, ensuring that assets are no longer tied up.
  • Calculating Redemption Price: Determining the value at which system coin holders can redeem their coins for backing collateral.
  • Redemption: Enabling system coin holders to exchange their coins for the appropriate collateral, completing the shutdown process.

This contract is crucial for ensuring that, in the event of a system shutdown, all parties can walk away with assets that are rightfully theirs, thus maintaining a fair and secure environment.

2. Contract Details

Key Methods:

Public

  • freezeCollateralType: Captures the current market price of a specified collateral type and freezes it within the contract. This is crucial for ensuring accurate valuations during the shutdown process.
  • fastTrackAuction: Allows for the immediate termination of ongoing collateral auctions. This function ensures that assets are returned to their rightful owners as quickly as possible during a shutdown.
  • processSAFE: This method is responsible for settling the debts associated with SAFEs and determining any collateral deficit that exists. This ensures that all assets and liabilities are properly accounted for.
  • freeCollateral: Post-processing of SAFEs, this function enables SAFE owners to withdraw any remaining collateral. This ensures that users recover their tied-up assets.
  • setOutstandingCoinSupply: Sets the global coin supply (which also accounts for the system's debt). This is important for calculating how much collateral can be redeemed for each system coin.
  • calculateCashPrice: Determines the price at which system coin holders can redeem their coins for backing collateral. This provides clarity and fairness in the redemption process.
  • prepareCoinsForRedeeming: Allows system coin holders to deposit their coins into the contract in preparation for redemption. This sets the stage for users to reclaim their backing collateral.
  • redeemCollateral: Executes the redemption process, transferring the appropriate amount of collateral to system coin holders who have previously deposited their coins for redemption. This is the final step in the shutdown and asset recovery process.

Authorized

  • shutdownSystem: This function triggers the system shutdown, initiating all the processes mentioned above. This function can only be executed by an authorized entity.

These methods collectively enable a structured and secure way to halt system operations, settle accounts, and distribute assets in the event of a system shutdown.

Contract Parameters:

  • Oracle Relayer: The address used to fetch the redemption price and the collaterals price.
  • Liquidation Engine: The address used to fetch the collateral auction houses from each collateral type.
  • Coin Join: The Coin Join contract (to disable).
  • Collateral Join Factory: The Collateral Join Factory contract (to disable).
  • Collateral Auction House Factory: The Collateral Auction House Factory contract (to disable).
  • Stability Fee Treasury: The Stability Fee Treasury contract, that needs to be disabled before the Accounting Engine to transfer its funds to it.
  • Accounting Engine: The Accounting Engine contract, that tries after disablement to settle as much debt as possible, and transfer the remaining surplus to the post settlement drain account.
  • shutdownCooldown: The amount of time that must pass after the system shutdown is triggered before the outstanding coin supply can be calculated.

3. Key Mechanisms & Concepts

System Shutdown

The system shutdown is triggered by calling the shutdownSystem method, that triggers the disableContract method on the disableable contracts (see Disableable.sol). Disableable contracts implement the following tools:

  • contractEnabled: A boolean flag that indicates whether the contract is enabled or disabled.
  • _onContractDisable method: A routine that is triggered when the contract is disabled.
  • whenEnabled / whenDisabled modifiers: Modifiers that can be used to restrict the execution of a method to when the contract is enabled or disabled.

Collateral Redemption Price Calculation

The calculateCashPrice method plays a critical role in the Global Settlement contract by determining the rate at which each system coin can be redeemed for its underlying collateral. The method employs a complex formula to arrive at this price, ensuring an equitable distribution of collateral assets based on various dynamic factors.

The formula used to calculate the collateral redemption price (collateralCashPrice) is as follows:

collateralCashPrice =
(
    collateralDebt * accumulatedRate / collateralPrice
    - collateralShortfall
) / outstandingCoinSupply

Where:

  • collateralDebt: Represents the aggregate debt associated with a specific collateral type, generated by SAFEs.
  • accumulatedRate: The total accrued rate (like interest or tax rate) applied to the specific collateral type over time.
  • collateralPrice: The most recent market price for the specific collateral type, usually fetched from a trusted oracle.
  • outstandingCoinSupply: The total circulation of system coins, essentially the aggregate debt of the system.
  • collateralShortfall: Quantifies the deficit in terms of system coins for the collateral type.

    If SAFEs for a particular collateral type are under-collateralized, this value will capture the shortfall. Conversely, if SAFEs are over-collateralized, owners are entitled to withdraw the surplus.

Redemption Mechanism:

Once the collateralCashPrice is calculated, users can redeem their system coins for the backing collateral using the following formula:

redeemableCollateral = coinAmount * collateralCashPrice

This ensures that each coin is redeemable for a fair portion of collateral, aiming to clear out both coins and collateral from the system by the end of the Global Settlement process.

Notice: The design of this formula is such that by the end of the redemption process, the system should ideally have neither excess coins nor remaining collateral. It provides a balanced mechanism for winding down system operations and returning assets to participants.

4. Gotchas

5. Failure Modes

Parameters Misconfiguration

  • A too-low shutdownCooldown risks premature shutdown, leading to inaccurate collateral redemption prices due to incomplete auctions and unprocessed SAFEs.
  • A too-high shutdownCooldown prolongs the waiting period for users to redeem their coins for backing collateral, causing potential liquidity issues.

Incorrect Authorizations or State

This contract requires to have authorization in the following contracts:

  • SAFEEngine
  • OracleRelayer
  • LiquidationEngine
  • CollateralAuctionHouseFactory
  • CoinJoin
  • CollateralJoinFactory
  • StabilityFeeTreasury
  • AccountingEngine

Should one of this authorizations be missing, the contract will not work as expected, reverting on the shutdownSystem routine.

The routine also requires all above contracts to be enabled. Should one of these contracts have been manually disabled, the routine will revert.

Post Settlement Surplus Auction House

See PostSettlmentSurplusAuctionHouse.sol for more details.

1. Introduction

The Post Settlement Surplus Auction House is responsible for auctioning off the surplus coins the system has after the global settlement is triggered. The auctions resemble the Surplus Auction House auctions, with the difference that all of the protocol tokens are burned.

2. Contract Details

Key Methods:

Public

  • increaseBidSize: Allows users to bid on the auctions, protocol tokens are transferred in this call.
  • restartAuction: Restarts an auction that expired with no bids.
  • settleAuction: Settles an auction, sending the system coins to the winning bidder.

Authorized

  • startAuction: Starts a new surplus auction.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

Settlement Surplus Actioneer

See SettlementSurplusActioneer.sol for more details.

1. Introduction

The Settlement Surplus Auction Module facilitates the auctioning of surplus coins held by the system following the activation of a global settlement. The module's purpose is grounded in the idea that without conducting an auction, the total circulating coins might fall short of the overall system debt. This imbalance could lead to an increased redemption price for collateral. By orchestrating surplus auctions, the system guarantees an equitable redemption price, while also deterring ill-intentioned actors from exploiting a global settlement to acquire collaterals at a discounted rate.

2. Contract Details

Key Methods:

Public

  • auctionSurplus: Triggers a surplus auction and starts the cooldown period.

Contract Parameters:

  • Accounting Engine: Used to fetch the surplus auction parameters.
  • Surplus Auction House: The Post Settlement Surplus Auction House contract.

Notice: The contract reads the parameters from the Accounting Engine to define the surplus auction cooldown period and the size of the auctions.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

❱ Tokens & Utils

This section introduces the ERC20 tokens, and token adaptor contracts, such as CoinJoin and CollateralJoin. These contracts serve as vital bridges between tokens and the smart contract operations, enhancing interoperability and functionality.

System Coin

See SystemCoin.sol for more details.

Protocol Token

See ProtocolToken.sol for more details.

Join Adapters

See CoinJoin.sol, CollateralJoin.sol for more details.

1. Introduction

The Join Adapter contracts assume responsibility for facilitating the seamless movement of collateral and system coin ERC20s into and out of the system. Their functions encompass:

  • Safeguarding collateral ERC20 tokens through locking them within the contract, leading to an augmentation of the user's collateral type balance.
  • Liberating collateral ERC20 tokens back to the user, thereby diminishing the user's collateral type balance.
  • Generating system coin ERC20 tokens through the locking of internal coins within the contract.
  • Eradicating system coin ERC20 tokens from the user's holdings, resulting in the release of internal coins to the user.

These contracts engage directly with the SAFE Engine, necessitating occasional user approval to permit the contract to access funds from their account. In the system, a collateral balance is denoted by a specific collateral type string (for example, 'ETH-A', 'OP').

2. Contract Details

2.1 Collateral Join

Key Methods:

  • join: This operation secures collateral ERC20 tokens within the contract and augments the collateral type balance of the designated account.
  • exit: This function liberates collateral ERC20 tokens to the specified account, resulting in a reduction of the user's collateral type balance.

2.2 Coin Join

Key Methods:

  • exit: This action involves locking internal coins within the contract and generating system coin ERC20 tokens for the designated account.
  • join: This function entails releasing internal coins to the specified account while extinguishing system coin ERC20 tokens from the user's holdings.

3. Key Mechanisms & Concepts

System Coin vs Collateral Modes

The system coin ERC20 represents a transferable unit of internal COINs that were initially generated via SAFEs. The ultimate purpose of the system coin ERC20 is to integrate into the system and contribute to the reduction of DEBT. This purpose leads to a reversal in logic between the Coin and Collateral Join contracts concerning the join and exit methods.

In the Collateral Join contract, users lock collateral to create an internal balance of a specific collateral type, and they can subsequently burn this internal balance to retrieve their ERC20 tokens. Conversely, in the Coin Join contract, users perform the opposite actions: they burn or mint the system coin ERC20 to respectively release or lock internal coins.

ERC20 Decimal Conversion

To accommodate a diverse array of collaterals and price references, the system employs a standardized unit for establishing balances and quotes, utilizing WAD precision (18 decimals). To ensure this consistency, the Collateral Join contract integrates a conversion factor during the execution of its join and exit methods. This strategy guarantees that users consistently interact with the contract using wei measurements, which align with the token's inherent precision.

Notice: The CollateralJoin contract supports tokens with less than 18 decimals, but not more.

4. Gotchas

Precision Dust

Due to the potential variance between the precision of the system and that of the ERC20 tokens, users might encounter a situation where their collateral balance is lower than the system's minimum withdrawal threshold. This discrepancy can arise when the amount of collateral falls short of even 1 wei, which is the smallest unit the system can process for withdrawal purposes.

5. Failure Modes

Global Settlement Mode

When the Coin Join functionality is deactivated, the contract permits the use of the join method while restricting access to the exit method. This implies that users retain the ability to convert their system coin ERC20 into internal coins, but they are prevented from generating additional system coin ERC20 tokens.

Conversely, in the event of Collateral Join being disabled, the contract enables the exit method while prohibiting the use of the join method. This signifies that users maintain the capability to redeem their collateral ERC20 by burning their corresponding collateral type balance, but they are unable to add more collateral ERC20 tokens to the contract.

On Authorizations

  • For Coin Join to mint system coin ERC20, authorization within the System Coin contract is mandatory.
  • Prior to interaction, users are required to grant approval within the SAFE Engine for the Coin Join contracts to access and withdraw funds from their account.
  • Collateral Join necessitates authorization within the SAFE Engine contract for the purpose of modifying the collateral balance.
  • With an active ERC20 balance and SAFE Engine authorization, the Collateral Join contract is capable of withdrawing funds from the user's account.
  • The Coin Join contract can effectively burn system coin ERC20 tokens to provide funds to the user's account, provided the user has granted approval within the SAFE Engine and the Coin Join retains an internal coin balance.

Replaceability

Both the Coin and Collateral Join contracts could potentially be superseded by a single new contract through a multi-step process carried out by a single user. This process involves repeating the following sequence:

  1. Deploy and configure the new Join contract.
  2. Deactivate the current Join contract.
  3. For the Collateral Join:
    • Execute exit on the old (deactivated) contract (reducing the internal balance).
    • Execute join on the new contract (increasing the internal balance).
    • Execute exit on the old contract.
    • Repeat this sequence until all collateral is successfully transferred.
  4. For the Coin Join:
    • Remove authorization for the system coin ERC20 from the old contract.
    • Execute join on the old (deactivated) contract (increasing the internal balance).
    • Execute exit on the new contract (reducing the internal balance).
    • Repeat this sequence until all system coin ERC20 tokens are moved.

The primary objective of this procedure is to ensure that both contracts conclude with no funds remaining locked within them. This approach guarantees that the new join contract attains an internal balance equivalent to the amount of ERC20 tokens locked. Subsequently, it's essential to revoke the relevant authorizations from these contracts to complete their deprecation.

❱ Contract Utils

This section provides an in-depth exploration of inheritable utility contracts meticulously crafted to enhance and amplify the capabilities of the protocol. These adaptable utility contracts, when inherited by other protocol contracts, introduce fresh and extended functionalities that enhance the overall development process and consistency of the system. Through a detailed examination of these utilities, readers will gain a deeper understanding of how they contribute to a more robust and harmonized protocol ecosystem.

Authorizable

See Authorizable.sol for more details.

1. Introduction

This abstract contract introduces a fundamental authorization mechanism designed for contracts. It enables a contract to manage authorization for multiple accounts, granting them specific permissions. This is achieved through the use of modifiers, which serve to control and restrict access to designated methods as required.

2. Contract Details

Key Methods:

Authorized

  • addAuthorization: Grants authorization to an account.
  • removeAuthorization: Removes authorization from an account.

Notice: Both methods will revert in the case of a no-operation (i.e. the account is already authorized or unauthorized).

3. Key Mechanisms & Concepts

In the contracts that inherit this functionality, all authorized accounts possess equal access privileges, without any hierarchy of authorization. This implies that any authorized account is capable of both adding and removing authorization for any other account.

4. Gotchas

5. Failure Modes

Modifiable

See Modifiable.sol for more details.

1. Introduction

This abstract contract establishes a standardized mechanism by which contracts can modify their registry and parameters. The available methods are confined to authorized accounts, ensuring that only designated entities have the authority to make these adjustments.

2. Contract Details

Key Methods:

  • modifyParameters: Modifies a parameter of the contract.
  • _validateParameters: Hook to validate the parameters after modifying them.

3. Key Mechanisms & Concepts

Standarized Method

The modifyParameters method is standarized to be shared across contracts that may require different types of parameters. The parameter values are passed as a bytes array, and the inheriting contract is responsible for parsing them (see Encoding).

There are 2 methods that can be used to modify the parameters:

  • modifyParameters(bytes32 _param, bytes memory _data): Modifies a global contract parameter.
  • modifyParameters(bytes32 _cType, bytes32 _param, bytes memory _data): Modifies a contract per-collateral parameter.

Parameters Structs

To explicitly define the parameters that can be modified, the contracts should define a parameters struct. Contract parameters that can be modified should be accessed through this struct, and will be read either as params.__param__ or cParams[_cType].__param__.

Parameters Validation

The _validateParameters hook is called after modifying the parameters, and can be used to validate the new parameters according to the contract's logic. All contract parameters should be validated, despite they having been modified or not. Common validations may use some of the methods defined in the Assertions library.

As with the modifyParameters method, there are 2 methods that can be used to validate the parameters:

  • _validateParameters: Validates all global contract parameter.
  • _validateCParameters: Validates all contract per-collateral parameter.

Notice: The validation hooks should avoid a parameter that would cause the contract to be set in an undesired way. For example, the OracleRelayer contract implements a check on the liquidation ratio to be always above 100%, else the system would allow for overleveraged positions.

4. Gotchas

Constructors

Contracts that incorporate this functionality must guarantee that their constructors enforce initial parameter validation. This approach serves to prevent the deployment of contracts with invalid parameters. As a result, all validated parameters must be provided as arguments during the contract's construction, ensuring that only valid configurations are utilized upon deployment.

Testing

To thoroughly test the complete implementation of the modifyParameters method, the testing process should involve fuzzing a parameters struct with all potential values. Subsequently, the method should be called, and the outcome must be validated to confirm that all parameters within the struct have been altered as intended.

To achieve this testing goal, the approach involves comparing the hash of the modified parameters struct with the struct's state obtained from the contract after the modifications have been executed. This rigorous comparison ensures that the method successfully and accurately modifies each parameter as specified.

5. Failure Modes

Disableable

See Disableable.sol for more details.

1. Introduction

This abstract contract introduces a fundamental disable mechanism for contracts. It grants the ability for a contract to be effectively deactivated, and utilizes modifiers to control access to specific methods based on the contract's current state.

2. Contract Details

Key Methods:

Authorized

  • disableContract: Disables the contract.

Internal

  • _onContractDisable: Hook to be called when the contract is disabled.
  • _isEnabled: Checks if the contract is enabled.

Modifiers

  • whenEnabled: Restricts access to the method to when the contract is enabled.
  • whenDisabled: Restricts access to the method to when the contract is disabled.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

❱ Factories

This section introduces a collection of essential contracts designed to streamline the creation and operation of various factory-related components. These contracts, alongside their accompanying utility modules, are specifically engineered to be inherited within the context of factory contracts. By leveraging these building blocks, developers can expedite the process of constructing, managing, and optimizing factory contracts with enhanced efficiency and reliability.

FactoryChild

See FactoryChild.sol for more details.

1. Introduction

This abstract contract is inherited by all contracts that are deployed through a factory. It provides a reference to the parent factory.

2. Contract Details

Key Methods:

  • factory: Returns the parent factory.

3. Key Mechanisms & Concepts

The rationale behind this contract is to provide a way of extending contracts that are standalone deployable, to be deployed through a factory. Contracts that are factory deployed can also implement other factory related utils, such as AuthorizableChild or DisableableChild.

4. Gotchas

Constructors

Contracts which only change from the standalone version is the constructor routine should not create a new instance of the contract, but be considered as another child implementation of the same contract. This is the case of the CollateralJoinDelegatableChild, which is a child implementation of the CollateralJoin contract, that calls the ERC20Votes.delegate method on constructor.

5. Failure Modes

AuthorizableChild

See AuthorizableChild.sol for more details.

1. Introduction

This abstract contract extends the Authorizable contract for factory deployed instances, to allow for a contract to be authorized in the parent factory, and still be able to access restricted methods.

2. Contract Details

Overrides

  • _isAuthorized: internal method to check if the sender is authorized in the contract or the parent factory.

3. Key Mechanisms & Concepts

The contract will check if the sender is authorized in the contract or the parent factory.

4. Gotchas

5. Failure Modes

DisableableChild

See DisableableChild.sol for more details.

1. Introduction

This abstract contract extends the Disableable contract for factory deployed instances, to allow for the parent factory to be disabled, and extend the disabled state to all the child contracts.

2. Contract Details

Overrides

  • _isEnabled: internal method to check if the contract AND the parent factory are enabled.
  • _onContractDisable: can only be called by the parent factory.

3. Key Mechanisms & Concepts

The contract will check if the contract AND the parent factory are enabled. If either is disabled, the contract is considered disabled.

4. Gotchas

Contracts that inherit this contract can only be disabled by the parent factory. In that way, the factory can keep track of all the enabled contracts that have been deployed through it.

5. Failure Modes

❱ Proxy Utils

One of the core components of the HAI ecosystem is the HAI Safe Manager and Proxy Contracts. These smart contracts are designed to provide a secure and efficient way to interact with the HAI protocol, enabling users to manage their SAFEs and assets, and execute transactions in a streamlined manner.

HAI Proxy

See HaiProxy.sol for more details.

1. Introduction

The HAI Proxy contract is a powerful and flexible smart contract commonly used within the decentralized finance (DeFi) ecosystem. Its primary function is to act as an extensible, personal proxy contract that allows users to bundle multiple actions into single, atomic transactions. With HAI Proxy, users can interact with multiple smart contracts or execute complex contract calls in a secure, efficient, and modular manner.

2. Contract Details

Key Methods:

Owner

  • execute: Allows owner to call a specific contract (usually a library or helper contract containing business logic) and pass in encoded function arguments to execute a certain operation.

3. Key Mechanisms & Concepts

Delegate Calls

In the Ethereum smart contract ecosystem, a delegate call is a special type of contract invocation that allows one contract to "borrow" code from another contract, executing it as if it were part of the calling contract's own code. Unlike a regular function call, a delegate call operates within the context of the calling contract, meaning it can read and modify the calling contract's state variables.

4. Gotchas

Dealing with Delegate Calls and ERC20 Transfers

When using proxy contracts that rely on delegate calls, certain common actions like ERC20 token transfers require special handling. In a typical setup, if a user attempts to execute ERC20.transfer directly, aiming to transfer a balance that is attributed to the proxy, the operation will fail and the call will revert. This is because delegate calls operate in the context of the calling contract, not the called contract. In this case, the calling contract is the proxy, which doesn't hold the tokens, leading to a failed transaction.

To work around this issue, an intermediary contract can be introduced. This intermediary contract is responsible for parsing the intended action and then executing the transfer operation using a regular call, rather than a delegate call.

5. Failure Modes

Proxy Factory

See HaiProxyFactory.sol and HaiProxyRegistry.sol for more details.

1. Introduction

The Proxy Factory Contract serves as a smart contract template for generating multiple proxy contracts in an automated, scalable manner. The Proxy Registry is a registry that keeps track of all the proxy contracts generated by the Proxy Factory Contract.

2. Contract Details

Key Methods:

Public

  • build: Creates a new proxy contract and registers it in the Proxy Registry.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

SAFE Manager

See HaiSafeManager.sol and SAFEHandler.sol for more details.

1. Introduction

The SAFE Manager Contract serves as an interface for interacting with the SAFE Engine, which is the core contract responsible for managing SAFEs in the HAI ecosystem. While the SAFE Engine handles the intricate logic and state changes for SAFEs, the SAFE Manager simplifies and streamlines user interactions with their SAFEs. Essentially, it provides an abstraction layer that facilitates operations such as depositing collateral, withdrawing, and managing debt positions in a user-friendly manner.

2. Contract Details

Key Methods:

  • openSAFE: Deploys a new SAFE Handler contract and registers it in the SAFE Manager.
  • transferSAFEOwnership: Initiates the ownership transfer of a SAFE to another address (doesn't reset SAFE protection).
  • acceptSAFEOwnership: Commits to the ownership transfer of a SAFE to another address (needs to be called by the new SAFE owner).
  • modifySAFECollateralization: Modifies the collateralization ratio of a SAFE (lock/free collateral and/or generate/repay debt).
  • transferCollateral: Transfers collateral from one account to another.
  • transferInternalCoins: Transfers internal coins from one account to another.
  • quitSystem: Closes a SAFE and transfers all remaining collateral and debt to the user's address.
  • enterSystem: Migrates collateral and debt from a source SAFE Handler to a destination SAFE.
  • moveSAFE: Migrates a SAFE from one SAFE to another.
  • protectSAFE: Protects a SAFE from being liquidated, using a SafeSaviour position to improve the SAFE health when it falls below the liquidation ratio.

3. Key Mechanisms & Concepts

SAFE IDs

The SAFE Engine identifies each SAFE by its unique contract address and the type of collateral it holds. In contrast, the SAFE Manager simplifies this by assigning each SAFE an auto-incremental ID when it is created. This ID serves as an easy-to-use reference point for users and external contracts, streamlining interactions and management. The auto-incremental ID is particularly useful for human readability and ease of interaction, while the address and collateral type identification in the SAFE Engine provides more granularity and is essential for the underlying mechanics.

Understanding the SAFE Handler

The SAFE Handler is a specialized contract that acts as an intermediary between the SAFE Engine and the SAFE Manager in the HAI system. Spawned when a new SAFE is created from the SAFE Manager, this contract communicates directly with the SAFE Engine from its unique address, to grant the SAFE Manager authorization to manage its corresponding SAFE, allowing for simplified user interactions and enhanced security. Essentially, each SAFE Handler represents a single-collateral SAFE and is managed by the SAFE Manager, which also controls any further authorizations for it.

User Authorization

The SAFE Manager Contract allows users to specify which addresses are authorized to interact with their SAFEs. This is crucial for advanced users who may want to deploy automated strategies via external smart contracts or trusted third parties.

SAFE Ownership Transfer

One unique feature is the ability to transfer ownership of a SAFE to another address. This facilitates a range of possibilities, including the sale of debt positions or the use of SAFEs in more complex financial products.

By providing a more accessible interface to the underlying SAFE Engine, the SAFE Manager Contract is an essential tool for anyone looking to interact with SAFEs in the HAI ecosystem.

SAFE Protection

SAFE owners can choose to connect a SafeSaviour position in order to improve the SAFE health and protect it from liquidation. When the SAFE is on the process of being liquidated, the SafeSaviour contract will unwind the user's position, in order to either reduce the SAFE debt, or increase its collateral, to improve the SAFE health and try to prevent liquidation.

SAFE owners need to account that the SafeSaviour position is connected to the SAFE id, so when transferring ownership to another account, it is responsibility of the previous owner to disconnect any liquidity deposited in the SafeSaviour contract.

4. Gotchas

5. Failure Modes

❱ Actions

The Actions Contract streamlines this process by offering a collection of pre-defined "actions" or methods that can be called through a proxy contract. These actions can then be combined into a single, atomic transaction, saving both time and cost.

Basic Actions

See BasicActions.sol for more details.

1. Introduction

These actions encapsulate all functionalities needed for the comprehensive management of Single-Collateral SAFEs within the SAFE Engine. Whether you're aiming to open, modify, or close SAFEs, Basic Actions provide the modular and gas-efficient methods to achieve your goals.

The scope of these Actions is to provide the user with a set of methods to interact with the SAFE Manager Contract. These methods are used by the HAI Proxy contract to execute the corresponding operations on the SAFE Engine.

2. Contract Details

Key Methods:

  • openSAFE: Creates a new SAFEHandler (associated with a collateral type) and registers it in the SAFE Manager.
  • generateDebt: Generates debt within a SAFE and transfers the generated coins to the user's address.
  • lockTokenCollateral: Locks a certain amount of tokens as collateral within a SAFE.
  • freeTokenCollateral: Frees a certain amount of tokens from a SAFE's collateral, and transfers them to the user's address.
  • repayAllDebt: Repays all debt within a SAFE (the amount of debt to repay is automatically calculated).

3. Key Mechanisms & Concepts

Key Concepts for SAFE Management

Managing Single-Collateral SAFEs involves a series of actions to effectively handle your collateral and debt. In this context, four core concepts—Lock, Free, Collect, and Exit—play a pivotal role. These actions are integrated into the Basic Actions module, simplifying the interaction with the SAFE Manager Contract and the SAFE Engine. Here's a closer look at each:

  • LOCK: Deposit collateral into a specified SAFE. This effectively "locks" your assets within the SAFE, providing the foundation upon which you can draw debt. It's the starting point for leveraging your assets within the SAFE ecosystem.
  • FREE: The inverse of "Lock." It lets you withdraw or "release" collateral from a SAFE back to your designated address, given that you meet the SAFE's conditions (e.g., maintaining a specific collateral ratio).
  • COLLECT: The "Collect" action is used to transfer collateral from an external address into the proxy contract. This is generally a preparatory step for other actions, such as "Lock," where the collateral will be moved from the proxy to the SAFE.
  • EXIT: The "Exit" action allows you to burn the internal representation of collateral in exchange for ERC20 tokens, which are transferred to your own address. This action is often used when you wish to exit the SAFE ecosystem and convert your assets back to a fungible, transferable form.

4. Gotchas

Internal Balances of the User

In proxy-based systems designed for asset management, the internal balances within the proxy contract are often automatically reset to zero after each transaction. This is because actions are configured to "exit" or transfer any remaining coins or tokens back to the user's own wallet. The design serves dual purposes: it enhances security by not leaving residual assets exposed in the proxy contract, and it simplifies user experience by allowing users to see their complete asset balances directly in their own accounts. Thus, if you observe that the internal balances of your proxy contract are consistently zero, it's because the system is purposefully designed to "exit" any remaining assets, ensuring that no residual value is left lingering within the proxy.

5. Failure Modes

Rewarded Actions

See RewardedActions.sol for more details.

1. Introduction

Maintaining the protocol's overall health often involves executing key maintenance methods. To incentivize these interactions, the Rewarded Actions Contract exists as a specialized layer that batches transactions for interacting with Jobs contracts. These Jobs contracts offer rewards to users for successfully calling specific maintenance methods critical to the protocol. By consolidating these calls into batch transactions via the Rewarded Actions Contract, users can more efficiently earn rewards while aiding in the protocol's upkeep.

2. Contract Details

Key Methods:

  • startDebtAuction: Starts a debt auction.
  • startSurplusAction: Starts a surplus auction.
  • popDebtFromQueue: Pops a debt block from the Accounting Engine's queue.
  • transferExtraSurplus: Transfers surplus (instead of auctioning it).
  • liquidateSAFE: Liquidates a SAFE.
  • updateCollateralPrice: Fether the latest price for a collateral type to update the system.
  • updateRedemptionRate: Triggers the redemption rate to be updated.

3. Key Mechanisms & Concepts

Payment Flow

In the HAI ecosystem, when users interact with Jobs contracts for performing key maintenance tasks, the rewards for these actions come from the Stability Fee Treasury. Upon successful execution of a job, the treasury transfers these rewards internally to the user's account within the protocol. Following this, a proxy action is triggered, designed specifically to "burn" these internal coins. This burning process essentially converts the internal balance into ERC20 HAI tokens, which are then withdrawn to the user's external wallet. Thus, the process seamlessly ensures that users are rewarded in a liquid form of HAI tokens that can be freely used or traded.

4. Gotchas

5. Failure Modes

Bidding Actions

See CollateralBidActions.sol, DebtBidActions.sol, SurplusBidActions.sol and PostSettlementSurplusBidActions.sol for more details.

1. Introduction

These contracts serve as the interaction layer between users and the auction houses responsible for handling collateral liquidations, debt auctions, and surplus auctions respectively.

2. Contract Details

Key Methods:

  • buyCollateral: Allows users to bid on collateral auctions.
  • decreaseSoldAmount: Allows users to bid on debt auctions.
  • increaseBidSize: Allows users to bid on surplus auctions.
  • settleAuction: Settles an auction and withraws the corresponding funds to the user's account.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

Settlement Actions

See GlobalSettlementActions.sol for more details.

1. Introduction

Following a Global Settlement, the Settlement Actions Contract plays a critical role by batching essential transactions needed to interact with the protocol. This contract simplifies user interactions and boosts efficiency by consolidating multiple calls into one, easing the transition to the system's final state. Whether claiming collateral or finalizing debts, the Settlement Actions Contract is the go-to mechanism for all post-settlement activities.

2. Contract Details

Key Methods:

  • freeCollateral: Allows users to claim their remaining collateral after a SAFE was processed.
  • prepareCoinsForRedeeming: Deposits system coins for them to be later redeemed.
  • redeemCollateral: Claims the corresponding collateral for a given amount of system coins deposited.

3. Key Mechanisms & Concepts

4. Gotchas

5. Failure Modes

Contents

Contents

AuthorizableChild

Git Source

Inherits: Authorizable, FactoryChild, IAuthorizableChild

This abstract contract is used to handle Authorizable children contracts through a parent factory

To give permissions to all children contracts, add authorization on the parent factory

To give permissions to a specific child contract, add authorization on the child contract

Functions

_isAuthorized

Method override to check for authorization also in the parent factory

function _isAuthorized(address _account) internal view virtual override returns (bool _authorized);

Parameters

NameTypeDescription
_accountaddressAccount to check authorization for

Returns

NameTypeDescription
_authorizedboolWhether the account is authorized either in contract or in factory

BeefyVeloVaultRelayerChild

Git Source

Inherits: BeefyVeloVaultRelayer, FactoryChild, IBeefyVeloVaultRelayerChild

This contract inherits all the functionality of BeefyVeloVaultRelayer to be factory deployed

Functions

constructor

constructor(
  IBaseOracle _token0priceSource,
  IBaseOracle _token1priceSource,
  IBeefyVaultV7 _beefyVault,
  IVeloPool _veloPool
) BeefyVeloVaultRelayer(_token0priceSource, _token1priceSource, _beefyVault, _veloPool);

Parameters

NameTypeDescription
_token0priceSourceIBaseOracleAddress of the price source for the first token in the velo pool
_token1priceSourceIBaseOracleAddress of the price source for the second token in the velo pool
_beefyVaultIBeefyVaultV7The address of the beefy vault contract
_veloPoolIVeloPoolThe address of the velo pool underlying the beefy vault

BeefyVeloVaultRelayerFactory

Git Source

Inherits: Authorizable, IBeefyVeloVaultRelayerFactory

This contract is used to deploy BeefyVeloVaultRelayer contracts

The deployed contracts are BeefyVeloVaultRelayerChild instances

State Variables

_beefyVeloVaultRelayers

The enumerable set of deployed BeefyVeloVaultRelayer contracts

EnumerableSet.AddressSet internal _beefyVeloVaultRelayers;

Functions

constructor

constructor() Authorizable(msg.sender);

deployBeefyVeloVaultRelayer

Deploys a new BeefyVeloVaultRelayer contract

function deployBeefyVeloVaultRelayer(
  IBaseOracle _token0priceSource,
  IBaseOracle _token1priceSource,
  IBeefyVaultV7 _beefyVault,
  IVeloPool _veloPool
) external isAuthorized returns (IBaseOracle _beefyVeloVaultRelayer);

Parameters

NameTypeDescription
_token0priceSourceIBaseOracleAddress of the price source for the first token in the velo pool
_token1priceSourceIBaseOracleAddress of the price source for the second token in the velo pool
_beefyVaultIBeefyVaultV7The address of the beefy vault contract
_veloPoolIVeloPoolThe address of the velo pool underlying the beefy vault

Returns

NameTypeDescription
_beefyVeloVaultRelayerIBaseOracleAddress of the deployed BeefyVeloVaultRelayer contract

beefyVeloVaultRelayersList

Getter for the list of BeefyVeloVaultRelayer contracts

function beefyVeloVaultRelayersList() external view returns (address[] memory _beefyVeloVaultRelayersList);

Returns

NameTypeDescription
_beefyVeloVaultRelayersListaddress[]List of BeefyVeloVaultRelayer contracts

ChainlinkRelayerChild

Git Source

Inherits: ChainlinkRelayer, FactoryChild, IChainlinkRelayerChild

This contract inherits all the functionality of ChainlinkRelayer to be factory deployed

Functions

constructor

constructor(
  address _priceFeed,
  address __sequencerUptimeFeed,
  uint256 _staleThreshold
) ChainlinkRelayer(_priceFeed, __sequencerUptimeFeed, _staleThreshold);

Parameters

NameTypeDescription
_priceFeedaddressThe address of the price feed to relay
__sequencerUptimeFeedaddressThe address of the sequencer uptime feed to relay
_staleThresholduint256The threshold in seconds to consider the aggregator stale

sequencerUptimeFeed

function sequencerUptimeFeed()
  public
  view
  override(ChainlinkRelayer, IChainlinkRelayer)
  returns (IChainlinkOracle __sequencerUptimeFeed);

_setSequencerUptimeFeed

Sets the Chainlink sequencer uptime feed contract address

Modifying sequencerUptimeFeed's address results in a no-operation (is read from factory)

function _setSequencerUptimeFeed(address __sequencerUptimeFeed) internal override;

Parameters

NameTypeDescription
__sequencerUptimeFeedaddressIgnored parameter (read from factory)

ChainlinkRelayerFactory

Git Source

Inherits: Authorizable, IChainlinkRelayerFactory

This contract is used to deploy ChainlinkRelayer contracts

The deployed contracts are ChainlinkRelayerChild instances

State Variables

sequencerUptimeFeed

Address of the Chainlink sequencer uptime feed used to consult the sequencer status

IChainlinkOracle public sequencerUptimeFeed;

_chainlinkRelayers

The enumerable set of deployed ChainlinkRelayer contracts

EnumerableSet.AddressSet internal _chainlinkRelayers;

Functions

constructor

constructor(address _sequencerUptimeFeed) Authorizable(msg.sender);

Parameters

NameTypeDescription
_sequencerUptimeFeedaddressThe address of the Chainlink sequencer uptime feed

deployChainlinkRelayer

Deploys a new ChainlinkRelayer contract

function deployChainlinkRelayer(
  address _priceFeed,
  uint256 _staleThreshold
) external isAuthorized returns (IBaseOracle _chainlinkRelayer);

Parameters

NameTypeDescription
_priceFeedaddressAddress of the price feed to be used by the ChainlinkRelayer contract
_staleThresholduint256Stale threshold to be used by the ChainlinkRelayer contract

Returns

NameTypeDescription
_chainlinkRelayerIBaseOracleAddress of the deployed ChainlinkRelayer contract

chainlinkRelayersList

Getter for the list of ChainlinkRelayer contracts

function chainlinkRelayersList() external view returns (address[] memory _chainlinkRelayersList);

Returns

NameTypeDescription
_chainlinkRelayersListaddress[]List of ChainlinkRelayer contracts

setSequencerUptimeFeed

Sets the Chainlink sequencer uptime feed contract address

function setSequencerUptimeFeed(address _sequencerUptimeFeed) external isAuthorized;

Parameters

NameTypeDescription
_sequencerUptimeFeedaddressThe address of the Chainlink sequencer uptime feed

_setSequencerUptimeFeed

function _setSequencerUptimeFeed(address _sequencerUptimeFeed) internal;

CollateralAuctionHouseChild

Git Source

Inherits: DisableableChild, AuthorizableChild, CollateralAuctionHouse, ICollateralAuctionHouseChild

This contract inherits all the functionality of CollateralAuctionHouse to be factory deployed

Functions

constructor

constructor(
  address _safeEngine,
  address _liquidationEngine,
  address _oracleRelayer,
  bytes32 _cType,
  CollateralAuctionHouseParams memory _cahParams
) CollateralAuctionHouse(_safeEngine, _liquidationEngine, _oracleRelayer, _cType, _cahParams);

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_liquidationEngineaddressIgnored parameter (read from factory)
_oracleRelayeraddressIgnored parameter (read from factory)
_cTypebytes32Bytes32 representation of the collateral type
_cahParamsCollateralAuctionHouseParamsInitial valid CollateralAuctionHouse parameters struct

liquidationEngine

Address of the LiquidationEngine contract

Overriding method reads liquidationEngine from factory

function liquidationEngine()
  public
  view
  override(CollateralAuctionHouse, ICollateralAuctionHouse)
  returns (ILiquidationEngine _liquidationEngine);

oracleRelayer

Address of the OracleRelayer contract

Overriding method reads oracleRelayer from factory

function oracleRelayer()
  public
  view
  override(CollateralAuctionHouse, ICollateralAuctionHouse)
  returns (IOracleRelayer _oracleRelayer);

_setLiquidationEngine

Modifying liquidationEngine's address results in a no-operation (is read from factory)

function _setLiquidationEngine(address _newLiquidationEngine) internal override;

Parameters

NameTypeDescription
_newLiquidationEngineaddressIgnored parameter (read from factory)

_setOracleRelayer

Modifying oracleRelayer's address results in a no-operation (is read from factory)

function _setOracleRelayer(address _newOracleRelayer) internal override;

Parameters

NameTypeDescription
_newOracleRelayeraddressIgnored parameter (read from factory)

_isAuthorized

Method override to check for authorization also in the parent factory

function _isAuthorized(address _account)
  internal
  view
  override(AuthorizableChild, Authorizable)
  returns (bool _authorized);

Parameters

NameTypeDescription
_accountaddressAccount to check authorization for

Returns

NameTypeDescription
_authorizedboolWhether the account is authorized either in contract or in factory

_isEnabled

Method override to check for contract enablement also in the parent factory

function _isEnabled() internal view override(DisableableChild, Disableable) returns (bool _enabled);

Returns

NameTypeDescription
_enabledboolWhether the contract and the factory are enabled or not

_onContractDisable

Method override to allow disabling contract only through the parent factory

function _onContractDisable() internal override(DisableableChild, Disableable);

CollateralAuctionHouseFactory

Git Source

Inherits: Authorizable, Modifiable, ModifiablePerCollateral, Disableable, ICollateralAuctionHouseFactory

This contract is used to deploy CollateralAuctionHouse contracts

The deployed contracts are CollateralAuctionHouseChild instances

State Variables

safeEngine

Address of the SAFEEngine contract

address public safeEngine;

liquidationEngine

Address of the LiquidationEngine contract

address public liquidationEngine;

oracleRelayer

Address of the OracleRelayer contract

address public oracleRelayer;

collateralAuctionHouses

Getter for the address of the CollateralAuctionHouse contract associated with a collateral type

mapping(bytes32 _cType => address) public collateralAuctionHouses;

Functions

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType)
  external
  view
  returns (ICollateralAuctionHouse.CollateralAuctionHouseParams memory _cahParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_cahParamsICollateralAuctionHouse.CollateralAuctionHouseParamsCollateralAuctionHouse parameters struct

_cParams

Getter for the unpacked collateral parameters struct

function _cParams(bytes32 _cType)
  external
  view
  returns (uint256 _minimumBid, uint256 _minDiscount, uint256 _maxDiscount, uint256 _perSecondDiscountUpdateRate);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_minimumBiduint256Minimum bid for the collateral auctions [wad]
_minDiscountuint256Minimum discount for the collateral auctions [wad %]
_maxDiscountuint256Maximum discount for the collateral auctions [wad %]
_perSecondDiscountUpdateRateuint256Per second rate at which the discount is updated [ray]

constructor

Adds authorization to the LiquidationEngine (extended to all child contracts)

constructor(
  address _safeEngine,
  address _liquidationEngine,
  address _oracleRelayer
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_liquidationEngineaddressAddress of the LiquidationEngine contract
_oracleRelayeraddressAddress of the OracleRelayer contract

collateralAuctionHousesList

Getter for the list of CollateralAuctionHouse contracts

function collateralAuctionHousesList() external view returns (address[] memory _collateralAuctionHousesList);

Returns

NameTypeDescription
_collateralAuctionHousesListaddress[]_collateralAuctionHouses List of CollateralAuctionHouse contracts

_initializeCollateralType

function _initializeCollateralType(bytes32 _cType, bytes memory _collateralParams) internal override whenEnabled;

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_modifyParameters

Set a new value for a collateral specific parameter

function _modifyParameters(bytes32 _cType, bytes32 _param, bytes memory _data) internal override;

Parameters

NameTypeDescription
_cTypebytes32String identifier of the collateral to modify
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

_setLiquidationEngine

Sets the LiquidationEngine contract address, revoking the previous, and granting the new one authorization

function _setLiquidationEngine(address _newLiquidationEngine) internal;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

CollateralJoinChild

Git Source

Inherits: CollateralJoin, DisableableChild, ICollateralJoinChild

This contract inherits all the functionality of CollateralJoin to be factory deployed

Functions

constructor

constructor(address _safeEngine, bytes32 _cType, address _collateral) CollateralJoin(_safeEngine, _cType, _collateral);

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SafeEngine contract
_cTypebytes32Bytes32 representation of the collateral type
_collateraladdressAddress of the ERC20 collateral token

_isEnabled

Method override to check for contract enablement also in the parent factory

function _isEnabled() internal view override(DisableableChild, Disableable) returns (bool _enabled);

Returns

NameTypeDescription
_enabledboolWhether the contract and the factory are enabled or not

_onContractDisable

Method override to allow disabling contract only through the parent factory

function _onContractDisable() internal override(DisableableChild, Disableable);

CollateralJoinDelegatableChild

Git Source

Inherits: CollateralJoinChild, ICollateralJoinDelegatableChild

This contract inherits all the functionality of CollateralJoin to be factory deployed and adds a ERC20Votes delegation

For well behaved ERC20Votes tokens with less than 18 decimals

State Variables

delegatee

Address to whom the voting power is delegated

address public delegatee;

Functions

constructor

constructor(
  address _safeEngine,
  bytes32 _cType,
  address _collateral,
  address _delegatee
) CollateralJoinChild(_safeEngine, _cType, _collateral);

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SafeEngine contract
_cTypebytes32Bytes32 representation of the collateral type
_collateraladdressAddress of the ERC20Votes collateral token
_delegateeaddressAddress to whom the voting power is delegated

CollateralJoinFactory

Git Source

Inherits: Authorizable, Disableable, ICollateralJoinFactory

This contract is used to deploy CollateralJoin contracts

The deployed contracts are CollateralJoinChild or CollateralJoinDelegatableChild instances

State Variables

safeEngine

Address of the SAFEEngine contract

address public safeEngine;

_collateralTypes

The enumerable set of deployed CollateralJoin contracts

EnumerableSet.Bytes32Set internal _collateralTypes;

collateralJoins

Getter for the address of the CollateralJoin contract associated with a collateral type

mapping(bytes32 _cType => address _collateralJoin) public collateralJoins;

Functions

constructor

constructor(address _safeEngine) Authorizable(msg.sender);

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract

deployCollateralJoin

Deploys a CollateralJoinChild contract

function deployCollateralJoin(
  bytes32 _cType,
  address _collateral
) external isAuthorized whenEnabled returns (ICollateralJoin _collateralJoin);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_collateraladdressAddress of the ERC20 collateral token

Returns

NameTypeDescription
_collateralJoinICollateralJoinAddress of the deployed CollateralJoinChild contract

deployDelegatableCollateralJoin

Deploys a CollateralJoinDelegatableChild contract

function deployDelegatableCollateralJoin(
  bytes32 _cType,
  address _collateral,
  address _delegatee
) external isAuthorized whenEnabled returns (ICollateralJoin _collateralJoin);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_collateraladdressAddress of the ERC20Votes collateral token
_delegateeaddressAddress to whom the deployed child will delegate the voting power to

Returns

NameTypeDescription
_collateralJoinICollateralJoinAddress of the deployed CollateralJoinDelegatableChild contract

disableCollateralJoin

Disables a CollateralJoin contract and removes it from the collateral types list

Allows the deployment of other CollateralJoin contract for the same collateral type

function disableCollateralJoin(bytes32 _cType) external isAuthorized;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

collateralTypesList

Getter for the list of collateral types

function collateralTypesList() external view returns (bytes32[] memory _collateralTypesList);

Returns

NameTypeDescription
_collateralTypesListbytes32[]List of collateral types

collateralJoinsList

Getter for the list of CollateralJoin contracts

function collateralJoinsList() external view returns (address[] memory _collateralJoinsList);

Returns

NameTypeDescription
_collateralJoinsListaddress[]List of CollateralJoin contracts

DelayedOracleChild

Git Source

Inherits: DelayedOracle, FactoryChild, IDelayedOracleChild

This contract inherits all the functionality of DelayedOracle to be factory deployed

Functions

constructor

constructor(IBaseOracle _priceSource, uint256 _updateDelay) DelayedOracle(_priceSource, _updateDelay);

Parameters

NameTypeDescription
_priceSourceIBaseOracleAddress of the price source
_updateDelayuint256Amount of seconds to be applied between the price source and the delayed oracle feeds

DelayedOracleFactory

Git Source

Inherits: Authorizable, IDelayedOracleFactory

This contract is used to deploy DelayedOracle contracts

The deployed contracts are DelayedOracleChild instances

State Variables

_delayedOracles

The enumerable set of deployed DelayedOracle contracts

EnumerableSet.AddressSet internal _delayedOracles;

Functions

constructor

constructor() Authorizable(msg.sender);

deployDelayedOracle

Deploys a new DelayedOracle contract

function deployDelayedOracle(
  IBaseOracle _priceSource,
  uint256 _updateDelay
) external isAuthorized returns (IDelayedOracle _delayedOracle);

Parameters

NameTypeDescription
_priceSourceIBaseOracleAddress of the price source for the DelayedOracle contract
_updateDelayuint256Delay in seconds to be applied between the price source and the delayed oracle feeds

Returns

NameTypeDescription
_delayedOracleIDelayedOracleAddress of the deployed DelayedOracle contract

delayedOraclesList

Getter for the list of DelayedOracle contracts

function delayedOraclesList() external view returns (address[] memory _delayedOraclesList);

Returns

NameTypeDescription
_delayedOraclesListaddress[]List of DelayedOracle contracts

DenominatedOracleChild

Git Source

Inherits: DenominatedOracle, FactoryChild, IDenominatedOracleChild

This contract inherits all the functionality of DenominatedOracle to be factory deployed

Functions

constructor

constructor(
  IBaseOracle _priceSource,
  IBaseOracle _denominationPriceSource,
  bool _inverted
) DenominatedOracle(_priceSource, _denominationPriceSource, _inverted);

Parameters

NameTypeDescription
_priceSourceIBaseOracleAddress of the price source
_denominationPriceSourceIBaseOracleAddress of the denomination price source
_invertedboolBoolean indicating if the denomination quote should be inverted

DenominatedOracleFactory

Git Source

Inherits: Authorizable, IDenominatedOracleFactory

This contract is used to deploy DenominatedOracle contracts

The deployed contracts are DenominatedOracleChild instances

State Variables

_denominatedOracles

The enumerable set of deployed DenominatedOracle contracts

EnumerableSet.AddressSet internal _denominatedOracles;

Functions

constructor

constructor() Authorizable(msg.sender);

deployDenominatedOracle

Deploys a new DenominatedOracle contract

The denomination quote should follow the format: (A / B) * (B / C) = A / C

function deployDenominatedOracle(
  IBaseOracle _priceSource,
  IBaseOracle _denominationPriceSource,
  bool _inverted
) external isAuthorized returns (IBaseOracle _denominatedOracle);

Parameters

NameTypeDescription
_priceSourceIBaseOracleAddress of the price source for the DenominatedOracle contract
_denominationPriceSourceIBaseOracleAddress of the denomination price source for the DenominatedOracle contract
_invertedboolBoolean indicating if the denomination calculation quote should be inverted

Returns

NameTypeDescription
_denominatedOracleIBaseOracleAddress of the deployed DenominatedOracle contract

denominatedOraclesList

Getter for the list of DenominatedOracle contracts

function denominatedOraclesList() external view returns (address[] memory _denominatedOraclesList);

Returns

NameTypeDescription
_denominatedOraclesListaddress[]List of DenominatedOracle contracts

DisableableChild

Git Source

Inherits: Disableable, FactoryChild, IDisableableChild

This abstract contract is used to disable Disableable children contracts through a parent factory

Functions

_isEnabled

Internal virtual view to check if the contract is enabled

Method override to check for contract enablement also in the parent factory

function _isEnabled() internal view virtual override returns (bool _enabled);

Returns

NameTypeDescription
_enabledboolWhether the contract and the factory are enabled or not

_onContractDisable

Internal virtual method to be called when the contract is disabled

Method override to allow disabling contract only through the parent factory

function _onContractDisable() internal virtual override onlyFactory;

FactoryChild

Git Source

Inherits: IFactoryChild

This abstract contract adds a factory address and modifier to the inheriting contract

State Variables

factory

Getter for the address of the factory that deployed the inheriting contract

address public factory;

Functions

constructor

Verifies that the contract is being deployed by a contract address

constructor();

onlyFactory

Verifies that the caller is the factory

modifier onlyFactory();

UniV3RelayerChild

Git Source

Inherits: UniV3Relayer, FactoryChild, IUniV3RelayerChild

This contract inherits all the functionality of UniV3Relayer to be factory deployed

Functions

constructor

constructor(
  address _uniV3Factory,
  address _baseToken,
  address _quoteToken,
  uint24 _feeTier,
  uint32 _quotePeriod
) UniV3Relayer(_uniV3Factory, _baseToken, _quoteToken, _feeTier, _quotePeriod);

Parameters

NameTypeDescription
_uniV3Factoryaddress
_baseTokenaddressAddress of the base token to be quoted
_quoteTokenaddressAddress of the quote reference token
_feeTieruint24Fee tier used to identify the UniV3 pool
_quotePerioduint32Length of the period used to calculate the TWAP quote

UniV3RelayerFactory

Git Source

Inherits: Authorizable, IUniV3RelayerFactory

This contract is used to deploy UniV3Relayer contracts

The deployed contracts are UniV3RelayerChild instances

State Variables

_UNI_V3_FACTORY

Address of the UniswapV3Factory used to fetch the pool address

address internal immutable _UNI_V3_FACTORY;

_uniV3Relayers

The enumerable set of deployed UniV3Relayer contracts

EnumerableSet.AddressSet internal _uniV3Relayers;

Functions

constructor

constructor(address _uniV3Factory) Authorizable(msg.sender);

deployUniV3Relayer

Deploys a new UniV3Relayer contract

function deployUniV3Relayer(
  address _baseToken,
  address _quoteToken,
  uint24 _feeTier,
  uint32 _quotePeriod
) external isAuthorized returns (IBaseOracle _uniV3Relayer);

Parameters

NameTypeDescription
_baseTokenaddressAddress of the base token to be quoted
_quoteTokenaddressAddress of the quote reference token
_feeTieruint24Fee tier used to identify the UniV3 pool
_quotePerioduint32Length of the period used to calculate the TWAP quote

Returns

NameTypeDescription
_uniV3RelayerIBaseOracleAddress of the deployed UniV3Relayer contract

uniV3RelayersList

Getter for the list of UniV3Relayer contracts

function uniV3RelayersList() external view returns (address[] memory _uniV3RelayersList);

Returns

NameTypeDescription
_uniV3RelayersListaddress[]List of UniV3Relayer contracts

Contents

DeviatedOracle

Git Source

Inherits: IBaseOracle

This oracle is used to simulate a price source that returns a price deviated from the redemption price

State Variables

deviation

The proportional deviation from the redemption price [wad %]

uint256 public deviation;

symbol

Symbol of the quote: token / baseToken (e.g. 'ETH / USD')

string public symbol;

oracleRelayer

The oracle relayer contract

IOracleRelayer public oracleRelayer;

Functions

constructor

constructor(string memory _symbol, address _oracleRelayer, uint256 _deviation);

Parameters

NameTypeDescription
_symbolstringThe symbol of the oracle
_oracleRelayeraddressThe address of the oracle relayer contract
_deviationuint256The proportional deviation from the redemption price [wad %]

getResultWithValidity

Fetch the latest oracle result and whether it is valid or not

This method should never revert

function getResultWithValidity() external view returns (uint256 _price, bool _validity);

read

Fetch the latest oracle result

Will revert if is the price feed is invalid

function read() external view returns (uint256 _price);

HardcodedOracle

Git Source

Inherits: IBaseOracle

This oracle is used to simulate a price source that returns a hardcoded price

State Variables

price

The hardcoded price the oracle returns [wad]

uint256 public price;

symbol

Symbol of the quote: token / baseToken (e.g. 'ETH / USD')

string public symbol;

Functions

constructor

constructor(string memory _symbol, uint256 _price);

Parameters

NameTypeDescription
_symbolstringThe symbol of the oracle
_priceuint256The hardcoded price the oracle returns [wad]

getResultWithValidity

Fetch the latest oracle result and whether it is valid or not

This method should never revert

function getResultWithValidity() external view returns (uint256 _price, bool _validity);

read

Fetch the latest oracle result

Will revert if is the price feed is invalid

function read() external view returns (uint256 _value);

MintableERC20

Git Source

Inherits: IERC20Metadata, ERC20

This ERC20 contract is used for testing purposes, to allow users to mint tokens

State Variables

_decimals

The number of decimals the token uses

uint8 internal _decimals;

Functions

constructor

constructor(string memory _name, string memory _symbol, uint8 __decimals) ERC20(_name, _symbol);

Parameters

NameTypeDescription
_namestringThe name of the ERC20 token
_symbolstringThe symbol of the ERC20 token
__decimalsuint8The number of decimals the token uses

decimals

function decimals() public view virtual override(ERC20, IERC20Metadata) returns (uint8 __decimals);

mint

Mint tokens to the caller

The minting amount is capped to uint192 to avoid overflowing supply

function mint(uint256 _wei) external;

Parameters

NameTypeDescription
_weiuint256The amount of tokens to mint (in wei representation)

mint

Mint tokens to the specified user

The minting amount is capped to uint192 to avoid overflowing supply

function mint(address _usr, uint256 _wei) external;

Parameters

NameTypeDescription
_usraddressAddress of the user to mint tokens to
_weiuint256The amount of tokens to mint (in wei representation)

Contents

HaiDelegatee

Git Source

Inherits: IHaiDelegatee, Ownable

This contract is used to proxy the voting power delegated to it to a delegatee

Compatible with OpenZeppelin's Governor contract

State Variables

delegatee

Get the address of the delegatee of the contract

address public delegatee;

Functions

constructor

constructor(address _owner) Ownable(_owner);

setDelegatee

Set the delegatee of the contract

function setDelegatee(address _delegatee) external onlyOwner;

Parameters

NameTypeDescription
_delegateeaddressThe address of the new delegatee

castVote

Cast a vote using the voting power delegated to this contract

function castVote(
  IGovernor _governor,
  uint256 _proposalId,
  uint8 _support
) public onlyDelegatee returns (uint256 _weight);

Parameters

NameTypeDescription
_governorIGovernorThe governor contract to vote on
_proposalIduint256The id of the proposal
_supportuint8The vote type

Returns

NameTypeDescription
_weightuint256The weight of the vote

castVoteWithReason

Cast a vote with reason using the voting power delegated to this contract

function castVoteWithReason(
  IGovernor _governor,
  uint256 _proposalId,
  uint8 _support,
  string memory _reason
) public onlyDelegatee returns (uint256 _weight);

Parameters

NameTypeDescription
_governorIGovernorThe governor contract to vote on
_proposalIduint256The id of the proposal
_supportuint8The vote type
_reasonstringThe reason for the vote

Returns

NameTypeDescription
_weightuint256The weight of the vote

castVoteWithReasonAndParams

Cast a vote with reason and params using the voting power delegated to this contract

function castVoteWithReasonAndParams(
  IGovernor _governor,
  uint256 _proposalId,
  uint8 _support,
  string memory _reason,
  bytes memory _params
) public onlyDelegatee returns (uint256 _weight);

Parameters

NameTypeDescription
_governorIGovernorThe governor contract to vote on
_proposalIduint256The id of the proposal
_supportuint8The vote type
_reasonstringThe reason for the vote
_paramsbytesThe params for the vote

onlyDelegatee

modifier onlyDelegatee();

HaiGovernor

Git Source

Inherits: Governor, GovernorSettings, GovernorCountingSimple, GovernorVotes, GovernorVotesQuorumFraction, GovernorPreventLateQuorum, GovernorTimelockControl

This contract implements OpenZeppelin's Governor contract overriding the clock to use block.timestamp

Functions

constructor

constructor(
  IVotes _token,
  string memory _governorName,
  IHaiGovernor.HaiGovernorParams memory _params
)
  Governor(_governorName)
  GovernorSettings(_params.votingDelay, _params.votingPeriod, _params.proposalThreshold)
  GovernorVotes(_token)
  GovernorVotesQuorumFraction(_params.quorumNumeratorValue)
  GovernorPreventLateQuorum(_params.quorumVoteExtension)
  GovernorTimelockControl(
    new TimelockController(_params.timelockMinDelay, new address[](0), new address[](0), address(this))
  );

clock

Set the clock to block timestamp, as opposed to the default block number

function clock() public view override(Governor, GovernorVotes) returns (uint48 _timestamp);

CLOCK_MODE

function CLOCK_MODE() public view virtual override(Governor, GovernorVotes) returns (string memory _mode);

_cancel

The following functions are overrides required by Solidity

function _cancel(
  address[] memory _targets,
  uint256[] memory _values,
  bytes[] memory _calldatas,
  bytes32 _descriptionHash
) internal override(Governor, GovernorTimelockControl) returns (uint256 _proposalId);

_executeOperations

function _executeOperations(
  uint256 _proposalId,
  address[] memory _targets,
  uint256[] memory _values,
  bytes[] memory _calldatas,
  bytes32 _descriptionHash
) internal override(Governor, GovernorTimelockControl);

_executor

function _executor() internal view override(Governor, GovernorTimelockControl) returns (address _addy);

_queueOperations

function _queueOperations(
  uint256 _proposalId,
  address[] memory _targets,
  uint256[] memory _values,
  bytes[] memory _calldatas,
  bytes32 _descriptionHash
) internal override(Governor, GovernorTimelockControl) returns (uint48 _scheduledTime);

proposalNeedsQueuing

function proposalNeedsQueuing(uint256 _proposalId)
  public
  view
  override(Governor, GovernorTimelockControl)
  returns (bool _needsQueuing);

proposalThreshold

function proposalThreshold() public view override(Governor, GovernorSettings) returns (uint256 _threshold);

state

function state(uint256 _proposalId)
  public
  view
  override(Governor, GovernorTimelockControl)
  returns (ProposalState _state);

_castVote

function _castVote(
  uint256 _proposalId,
  address _account,
  uint8 _support,
  string memory _reason,
  bytes memory _params
) internal override(Governor, GovernorPreventLateQuorum) returns (uint256 _voteId);

proposalDeadline

function proposalDeadline(uint256 _proposalId)
  public
  view
  override(Governor, GovernorPreventLateQuorum)
  returns (uint256 _deadline);

Contents

AccountingJob

Git Source

Inherits: Authorizable, Modifiable, Job, IAccountingJob

This contract contains rewarded methods to handle the accounting engine debt and surplus

State Variables

shouldWorkPopDebtFromQueue

Whether the pop debt from queue job should be worked

bool public shouldWorkPopDebtFromQueue;

shouldWorkAuctionDebt

Whether the auction debt job should be worked

bool public shouldWorkAuctionDebt;

shouldWorkAuctionSurplus

Whether the auction surplus job should be worked

bool public shouldWorkAuctionSurplus;

shouldWorkTransferExtraSurplus

Whether the transfer extra surplus job should be worked

bool public shouldWorkTransferExtraSurplus;

accountingEngine

Address of the AccountingEngine contract

IAccountingEngine public accountingEngine;

Functions

constructor

constructor(
  address _accountingEngine,
  address _stabilityFeeTreasury,
  uint256 _rewardAmount
) Job(_stabilityFeeTreasury, _rewardAmount) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_accountingEngineaddressAddress of the AccountingEngine contract
_stabilityFeeTreasuryaddressAddress of the StabilityFeeTreasury contract
_rewardAmountuint256Amount of tokens to reward per job transaction [wad]

workPopDebtFromQueue

Rewarded method to pop debt from the AccountingEngine's queue

function workPopDebtFromQueue(uint256 _debtBlockTimestamp) external reward;

Parameters

NameTypeDescription
_debtBlockTimestampuint256Timestamp of the debt block to pop

workAuctionDebt

Rewarded method to auction debt from the AccountingEngine

function workAuctionDebt() external reward;

workAuctionSurplus

Rewarded method to auction surplus from the AccountingEngine

function workAuctionSurplus() external reward;

workTransferExtraSurplus

Rewarded method to transfer surplus from the AccountingEngine

function workTransferExtraSurplus() external reward;

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override(Modifiable, Job);

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override(Modifiable, Job);

Job

Git Source

Inherits: Authorizable, Modifiable, IJob

This abstract contract is inherited by all jobs to add a reward modifier

State Variables

rewardAmount

Amount of tokens to reward per job transaction [wad]

uint256 public rewardAmount;

stabilityFeeTreasury

Address of the StabilityFeeTreasury contract

IStabilityFeeTreasury public stabilityFeeTreasury;

Functions

constructor

constructor(address _stabilityFeeTreasury, uint256 _rewardAmount);

Parameters

NameTypeDescription
_stabilityFeeTreasuryaddressAddress of the StabilityFeeTreasury contract
_rewardAmountuint256Amount of tokens to reward per job transaction [wad]

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal virtual override;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view virtual override;

reward

Modifier to reward the caller for calling the function

modifier reward();

LiquidationJob

Git Source

Inherits: Authorizable, Modifiable, Job, ILiquidationJob

This contract contains rewarded methods to handle the SAFE liquidations

State Variables

shouldWork

Whether the liquidation job should be worked

bool public shouldWork;

liquidationEngine

Address of the LiquidationEngine contract

ILiquidationEngine public liquidationEngine;

Functions

constructor

constructor(
  address _liquidationEngine,
  address _stabilityFeeTreasury,
  uint256 _rewardAmount
) Job(_stabilityFeeTreasury, _rewardAmount) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_liquidationEngineaddressAddress of the LiquidationEngine contract
_stabilityFeeTreasuryaddressAddress of the StabilityFeeTreasury contract
_rewardAmountuint256Amount of tokens to reward per job transaction [wad]

workLiquidation

Rewarded method to liquidate a SAFE

function workLiquidation(bytes32 _cType, address _safe) external reward;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE to liquidate

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override(Job, Modifiable);

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override(Job, Modifiable);

OracleJob

Git Source

Inherits: Authorizable, Modifiable, Job, IOracleJob

This contract contains rewarded methods to handle the oracle relayer and the PID rate setter updates

State Variables

shouldWorkUpdateCollateralPrice

Whether the update collateral price job should be worked

bool public shouldWorkUpdateCollateralPrice;

shouldWorkUpdateRate

Whether the update rate job should be worked

bool public shouldWorkUpdateRate;

oracleRelayer

Address of the OracleRelayer contract

IOracleRelayer public oracleRelayer;

pidRateSetter

Address of the PIDRateSetter contract

IPIDRateSetter public pidRateSetter;

Functions

constructor

constructor(
  address _oracleRelayer,
  address _pidRateSetter,
  address _stabilityFeeTreasury,
  uint256 _rewardAmount
) Job(_stabilityFeeTreasury, _rewardAmount) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_oracleRelayeraddressAddress of the OracleRelayer contract
_pidRateSetteraddressAddress of the PIDRateSetter contract
_stabilityFeeTreasuryaddressAddress of the StabilityFeeTreasury contract
_rewardAmountuint256Amount of tokens to reward per job transaction [wad]

workUpdateCollateralPrice

Rewarded method to update a collateral price

function workUpdateCollateralPrice(bytes32 _cType) external reward;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

workUpdateRate

Rewarded method to update the redemption rate

function workUpdateRate() external reward;

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override(Job, Modifiable);

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override(Job, Modifiable);

Contents

BeefyVeloVaultRelayer

Git Source

Inherits: IBaseOracle, IBeefyVeloVaultRelayer

Deconstructs a Beefy Vault to it's Velodrome liquidity pool and that pool's constituent tokens to return a price feed

Requires an underlying Velodrome pool and price feeds for the pool's tokens

State Variables

token0priceSource

Address of the token0 price source that is used to calculate the price

Assumes that the price source is a valid IBaseOracle

IBaseOracle public token0priceSource;

token1priceSource

Address of the token1 price source that is used to calculate the price

Assumes that the price source is a valid IBaseOracle

IBaseOracle public token1priceSource;

beefyVault

Address of the beefy vault

Assumes that the beefy vault is a valid IBeefyVaultV7

IBeefyVaultV7 public beefyVault;

veloPool

Address of the velo pool underlying the beefy vault

Assumes that the price source is a valid IVeloPool

IVeloPool public veloPool;

symbol

Symbol of the quote: token / baseToken (e.g. 'ETH / USD')

string public symbol;

Functions

constructor

constructor(
  IBaseOracle _token0priceSource,
  IBaseOracle _token1priceSource,
  IBeefyVaultV7 _beefyVault,
  IVeloPool _veloPool
);

Parameters

NameTypeDescription
_token0priceSourceIBaseOracleAddress of the price source for the first token in the velo pool
_token1priceSourceIBaseOracleAddress of the price source for the second token in the velo pool
_beefyVaultIBeefyVaultV7The address of the beefy vault contract
_veloPoolIVeloPoolThe address of the velo pool underlying the beefy vault

getResultWithValidity

Fetch the latest oracle result and whether it is valid or not

This method should never revert

function getResultWithValidity() external view returns (uint256 _result, bool _validity);

read

Fetch the latest oracle result

Will revert if is the price feed is invalid

function read() external view returns (uint256 _result);

_getCombinedPriceValue

Returns the combined price of the two tokens in the velo pool

function _getCombinedPriceValue(
  uint256 _token0priceSourceValue,
  uint256 _token1priceSourceValue
) internal view returns (uint256 _combinedPriceValue);

ChainlinkRelayer

Git Source

Inherits: IBaseOracle, IChainlinkRelayer

This contracts transforms a Chainlink price feed into a standard IBaseOracle feed It also verifies that the reading is new enough, compared to a staleThreshold

State Variables

priceFeed

Address of the Chainlink price feed used to consult the price

IChainlinkOracle public priceFeed;

_sequencerUptimeFeed

Internal storage variable to allow overrides in child implementation contract

IChainlinkOracle internal _sequencerUptimeFeed;

symbol

Symbol of the quote: token / baseToken (e.g. 'ETH / USD')

string public symbol;

multiplier

The multiplier used to convert the quote into an 18 decimals format

uint256 public multiplier;

staleThreshold

The time threshold after which a Chainlink response is considered stale

uint256 public staleThreshold;

Functions

constructor

constructor(address _priceFeed, address __sequencerUptimeFeed, uint256 _staleThreshold);

Parameters

NameTypeDescription
_priceFeedaddressThe address of the Chainlink price feed
__sequencerUptimeFeedaddressThe address of the Chainlink sequencer uptime feed
_staleThresholduint256The threshold after which the price is considered stale

sequencerUptimeFeed

Address of the Chainlink sequencer uptime feed used to consult the sequencer status

function sequencerUptimeFeed() public view virtual returns (IChainlinkOracle __sequencerUptimeFeed);

getResultWithValidity

Fetch the latest oracle result and whether it is valid or not

This method should never revert

function getResultWithValidity() external view returns (uint256 _result, bool _validity);

read

Fetch the latest oracle result

Will revert if is the price feed is invalid

function read() external view returns (uint256 _result);

_parseResult

Parses the result from the price feed into 18 decimals format

function _parseResult(int256 _feedResult) internal view returns (uint256 _result);

_isValidFeed

Checks if the feed is valid, considering the sequencer status, the staleThreshold and the feed timestamp

function _isValidFeed(uint256 _feedTimestamp) internal view returns (bool _valid);

_setSequencerUptimeFeed

Sets the Chainlink sequencer uptime feed contract address

function _setSequencerUptimeFeed(address __sequencerUptimeFeed) internal virtual;

DelayedOracle

Git Source

Inherits: IBaseOracle, IDelayedOracle

Transforms a price feed into a delayed price feed with a step function

Requires an external mechanism to call updateResult every updateDelay seconds

State Variables

priceSource

Address of the non-delayed price source

Assumes that the price source is a valid IBaseOracle

IBaseOracle public priceSource;

symbol

Symbol of the quote: token / baseToken (e.g. 'ETH / USD')

string public symbol;

updateDelay

The delay in seconds that should elapse between updates

uint256 public updateDelay;

lastUpdateTime

The timestamp of the last update

uint256 public lastUpdateTime;

_currentFeed

The current valid price feed storage struct

Feed internal _currentFeed;

_nextFeed

The next valid price feed storage struct

Feed internal _nextFeed;

Functions

constructor

constructor(IBaseOracle _priceSource, uint256 _updateDelay);

Parameters

NameTypeDescription
_priceSourceIBaseOracleThe address of the non-delayed price source
_updateDelayuint256The delay in seconds that should elapse between updates

updateResult

Updates the current price with the last next price, and reads the next price feed

Will revert if the delay since last update has not elapsed

function updateResult() external returns (bool _success);

Returns

NameTypeDescription
_successboolWhether the update was successful or not

getResultWithValidity

Fetch the latest oracle result and whether it is valid or not

This method should never revert

function getResultWithValidity() external view returns (uint256 _result, bool _validity);

read

Fetch the latest oracle result

Will revert if is the price feed is invalid

function read() external view returns (uint256 _result);

shouldUpdate

Indicates if a delay has passed since the last update

function shouldUpdate() external view returns (bool _ok);

Returns

NameTypeDescription
_okboolWhether the oracle should be updated or not

getNextResultWithValidity

The next valid price feed, taking effect at the next updateResult call

function getNextResultWithValidity() external view returns (uint256 _result, bool _validity);

Returns

NameTypeDescription
_resultuint256The value in 18 decimals format of the next price feed
_validityboolWhether the next price feed is valid or not

_getPriceSourceResult

Internal view function that queries the standard price source

function _getPriceSourceResult() internal view returns (uint256 _priceFeedValue, bool _hasValidValue);

_delayHasElapsed

Internal view function that returns whether the delay between calls has been passed

function _delayHasElapsed() internal view returns (bool _ok);

DenominatedOracle

Git Source

Inherits: IBaseOracle, IDenominatedOracle

Transforms two price feeds with a shared token into a new denominated price feed between the other two tokens of the feeds

Requires an external base price feed with a shared token between the price source and the denomination price source

State Variables

priceSource

Address of the base price source that is used to calculate the price

Assumes that the price source is a valid IBaseOracle

IBaseOracle public priceSource;

denominationPriceSource

Address of the base price source that is used to calculate the denominated price

Assumes that the price source is a valid IBaseOracle

IBaseOracle public denominationPriceSource;

symbol

Concatenated symbols of the two price sources used for quoting (e.g. '(WBTC / ETH) * (ETH / USD)')

The order of the symbols must follow a continuous chain of tokens

string public symbol;

inverted

Whether the price source quote should be inverted or not

Used to fix an inverted path of token quotes into a continuous chain of tokens (e.g. '(ETH / WBTC)^-1 * (ETH / USD)')

bool public inverted;

Functions

constructor

constructor(IBaseOracle _priceSource, IBaseOracle _denominationPriceSource, bool _inverted);

Parameters

NameTypeDescription
_priceSourceIBaseOracleAddress of the base price source that is used to calculate the price
_denominationPriceSourceIBaseOracleAddress of the denomination price source that is used to calculate price
_invertedboolFlag that indicates whether the price source quote should be inverted or not

getResultWithValidity

Fetch the latest oracle result and whether it is valid or not

This method should never revert

function getResultWithValidity() external view returns (uint256 _result, bool _validity);

read

Fetch the latest oracle result

Will revert if is the price feed is invalid

function read() external view returns (uint256 _result);

UniV3Relayer

Git Source

Inherits: IBaseOracle, IUniV3Relayer

This contracts consults a UniswapV3Pool TWAP and transforms the result into a standard IBaseOracle feed

The quote obtained from the pool query is transformed into an 18 decimals format

State Variables

uniV3Pool

Address of the UniswapV3Pool used to consult the TWAP

address public uniV3Pool;

baseToken

Address of the base token used to consult the quote from

address public baseToken;

quoteToken

Address of the token used as a quote reference

address public quoteToken;

symbol

Symbol of the quote: token / baseToken (e.g. 'ETH / USD')

string public symbol;

baseAmount

The amount in wei of the base token used to consult the pool for a quote

uint128 public baseAmount;

multiplier

The multiplier used to convert the quote into an 18 decimals format

uint256 public multiplier;

quotePeriod

The length of the TWAP used to consult the pool

uint32 public quotePeriod;

Functions

constructor

constructor(address _uniV3Factory, address _baseToken, address _quoteToken, uint24 _feeTier, uint32 _quotePeriod);

Parameters

NameTypeDescription
_uniV3Factoryaddress
_baseTokenaddressAddress of the base token used to consult the quote
_quoteTokenaddressAddress of the token used as a quote reference
_feeTieruint24Fee tier of the pool used to consult the quote
_quotePerioduint32Length in seconds of the TWAP used to consult the pool

getResultWithValidity

Fetch the latest oracle result and whether it is valid or not

Method will return invalid if the pool doesn't have enough history

function getResultWithValidity() external view returns (uint256 _result, bool _validity);

read

Fetch the latest oracle result

This method may revert with 'OLD!' if the pool doesn't have enough cardinality or initialized history

function read() external view returns (uint256 _result);

_parseResult

Parses the result from the aggregator into 18 decimals format

function _parseResult(uint256 _quoteResult) internal view returns (uint256 _result);

Contents

Contents

BasicActions

Git Source

Inherits: CommonActions, IBasicActions

This contract defines the actions that can be executed to manage a SAFE

Functions

_getGeneratedDeltaDebt

Gets delta debt generated for delta wad (always positive)

Total SAFE debt minus available safeHandler COIN balance

function _getGeneratedDeltaDebt(
  address _safeEngine,
  bytes32 _cType,
  address _safeHandler,
  uint256 _deltaWad
) internal view returns (int256 _deltaDebt);

_getRepaidDeltaDebt

Gets repaid delta debt generated

The rate adjusted debt of the SAFE

function _getRepaidDeltaDebt(
  address _safeEngine,
  bytes32 _cType,
  address _safeHandler
) internal view returns (int256 _deltaDebt);

_getRepaidDebt

Gets repaid debt

The rate adjusted SAFE's debt minus COIN balance available in usr's address

function _getRepaidDebt(
  address _safeEngine,
  address _usr,
  bytes32 _cType,
  address _safeHandler
) internal view returns (uint256 _deltaWad);

_generateDebt

Generates debt

Modifies the SAFE collateralization ratio, increasing the debt and sends the COIN amount to the user's address

function _generateDebt(
  address _manager,
  address _taxCollector,
  address _coinJoin,
  uint256 _safeId,
  uint256 _deltaWad
) internal;

_repayDebt

Repays debt

Joins COIN amount into the safeEngine and modifies the SAFE collateralization reducing the debt

function _repayDebt(
  address _manager,
  address _taxCollector,
  address _coinJoin,
  uint256 _safeId,
  uint256 _deltaWad
) internal;

_openSAFE

Routes the openSAFE call to the HaiSafeManager contract

function _openSAFE(address _manager, bytes32 _cType, address _usr) internal returns (uint256 _safeId);

_transferCollateral

Routes the transferCollateral call to the HaiSafeManager contract

function _transferCollateral(address _manager, uint256 _safeId, address _dst, uint256 _deltaWad) internal;

_transferInternalCoins

Routes the transferInternalCoins call to the HaiSafeManager contract

function _transferInternalCoins(address _manager, uint256 _safeId, address _dst, uint256 _rad) internal;

_modifySAFECollateralization

Routes the modifySAFECollateralization call to the HaiSafeManager contract

function _modifySAFECollateralization(
  address _manager,
  uint256 _safeId,
  int256 _deltaCollateral,
  int256 _deltaDebt
) internal;

_lockTokenCollateralAndGenerateDebt

Joins collateral and exits an amount of COIN

function _lockTokenCollateralAndGenerateDebt(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  uint256 _safeId,
  uint256 _collateralAmount,
  uint256 _deltaWad
) internal;

_collectAndExitCoins

Transfers an amount of COIN to the proxy address and exits to the user's address

function _collectAndExitCoins(address _manager, address _coinJoin, uint256 _safeId, uint256 _deltaWad) internal;

_collectAndExitCollateral

Transfers an amount of collateral to the proxy address and exits collateral tokens to the user

function _collectAndExitCollateral(
  address _manager,
  address _collateralJoin,
  uint256 _safeId,
  uint256 _deltaWad
) internal;

openSAFE

Opens a brand new SAFE

function openSAFE(address _manager, bytes32 _cType, address _usr) external onlyDelegateCall returns (uint256 _safeId);

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_cTypebytes32Bytes32 representing the collateral type
_usraddressAddress of the SAFE owner

Returns

NameTypeDescription
_safeIduint256Id of the created SAFE

generateDebt

Generates debt and sends COIN amount to msg.sender

function generateDebt(
  address _manager,
  address _taxCollector,
  address _coinJoin,
  uint256 _safeId,
  uint256 _deltaWad
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of COIN to generate [wad]

repayDebt

Repays an amount of debt

function repayDebt(
  address _manager,
  address _taxCollector,
  address _coinJoin,
  uint256 _safeId,
  uint256 _deltaWad
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of COIN to repay [wad]

lockTokenCollateral

Locks a collateral token amount in the SAFE

function lockTokenCollateral(
  address _manager,
  address _collateralJoin,
  uint256 _safeId,
  uint256 _deltaWad
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_collateralJoinaddressAddress of the CollateralJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of collateral to collateralize [wad]

freeTokenCollateral

Unlocks a collateral token amount from the SAFE, and transfers the ERC20 collateral to the user's address

function freeTokenCollateral(
  address _manager,
  address _collateralJoin,
  uint256 _safeId,
  uint256 _deltaWad
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_collateralJoinaddressAddress of the CollateralJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of collateral to free [wad]

repayAllDebt

Repays the total amount of debt of a SAFE

This method is used to close a SAFE's debt, when the amount of debt is increasing due to stability fees

function repayAllDebt(
  address _manager,
  address _taxCollector,
  address _coinJoin,
  uint256 _safeId
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE

lockTokenCollateralAndGenerateDebt

Locks a collateral token amount in the SAFE and generates debt

function lockTokenCollateralAndGenerateDebt(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  uint256 _safe,
  uint256 _collateralAmount,
  uint256 _deltaWad
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_collateralJoinaddressAddress of the CollateralJoin contract
_coinJoinaddressAddress of the CoinJoin contract
_safeuint256Id of the SAFE
_collateralAmountuint256Amount of collateral to collateralize [wad]
_deltaWaduint256Amount of COIN to generate [wad]

openLockTokenCollateralAndGenerateDebt

Creates a SAFE, locks a collateral token amount in it and generates debt

function openLockTokenCollateralAndGenerateDebt(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  bytes32 _cType,
  uint256 _collateralAmount,
  uint256 _deltaWad
) external onlyDelegateCall returns (uint256 _safe);

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_collateralJoinaddressAddress of the CollateralJoin contract
_coinJoinaddressAddress of the CoinJoin contract
_cTypebytes32Bytes32 representing the collateral type
_collateralAmountuint256Amount of collateral to collateralize [wad]
_deltaWaduint256Amount of COIN to generate [wad]

Returns

NameTypeDescription
_safeuint256Id of the created SAFE

repayDebtAndFreeTokenCollateral

Repays debt and unlocks a collateral token amount from the SAFE

function repayDebtAndFreeTokenCollateral(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  uint256 _safeId,
  uint256 _collateralWad,
  uint256 _debtWad
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_collateralJoinaddressAddress of the CollateralJoin contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE
_collateralWaduint256Amount of collateral to free [wad]
_debtWaduint256Amount of COIN to repay [wad]

repayAllDebtAndFreeTokenCollateral

Repays all debt and unlocks collateral from the SAFE

function repayAllDebtAndFreeTokenCollateral(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  uint256 _safeId,
  uint256 _collateralWad
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_collateralJoinaddressAddress of the CollateralJoin contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE
_collateralWaduint256Amount of collateral to free [wad]

collectTokenCollateral

Collects a collateral token amount from the SAFE handler, and transfers the ERC20 collateral to the user's address

function collectTokenCollateral(
  address _manager,
  address _collateralJoin,
  uint256 _safeId,
  uint256 _deltaWad
) external onlyDelegateCall;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_collateralJoinaddressAddress of the CollateralJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of collateral to collect [wad]

CollateralBidActions

Git Source

Inherits: CommonActions, ICollateralBidActions

All methods here are executed as delegatecalls from the user's proxy

Functions

buyCollateral

Buys collateral tokens from a collateral auction

This method will fail if the purchased amount is lower than the minimum, or the bid higher than the specified amount

function buyCollateral(
  address _coinJoin,
  address _collateralJoin,
  address _collateralAuctionHouse,
  uint256 _auctionId,
  uint256 _minCollateralAmount,
  uint256 _bidAmount
) external onlyDelegateCall;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_collateralJoinaddressAddress of the CollateralJoin contract
_collateralAuctionHouseaddressAddress of the CollateralAuctionHouse contract
_auctionIduint256Id of the auction to bid on
_minCollateralAmountuint256Minimum amount of collateral tokens to buy [wad]
_bidAmountuint256Amount of system coins to bid [wad]

CommonActions

Git Source

Inherits: ICommonActions

This abstract contract defines common actions to be used by the proxy actions contracts

State Variables

_THIS

Address of the inheriting contract, used to check if the call is being made through a delegate call

address internal immutable _THIS = address(this);

Functions

joinSystemCoins

Joins system coins into the safeEngine

function joinSystemCoins(address _coinJoin, address _dst, uint256 _wad) external onlyDelegateCall;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_dstaddressAddress of the SAFE to join the coins into
_waduint256Amount of coins to join [wad]

exitSystemCoins

Exits system coins from the safeEngine

function exitSystemCoins(address _coinJoin, uint256 _coinsToExit) external onlyDelegateCall;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_coinsToExituint256Amount of coins to exit [rad]

exitAllSystemCoins

Exits all system coins from the safeEngine

function exitAllSystemCoins(address _coinJoin) external onlyDelegateCall;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract

exitCollateral

Exits collateral tokens from the safeEngine

function exitCollateral(address _collateralJoin, uint256 _wad) external onlyDelegateCall;

Parameters

NameTypeDescription
_collateralJoinaddressAddress of the CollateralJoin contract
_waduint256Amount of collateral tokens to exit [wad]

_joinSystemCoins

Joins system coins into the safeEngine

Transfers ERC20 coins from the user to the proxy, then joins them through the CoinJoin contract into the destination SAFE

function _joinSystemCoins(address _coinJoin, address _dst, uint256 _wad) internal;

_exitSystemCoins

Exits system coins from the safeEngine

Exits system coins through the CoinJoin contract, transferring the ERC20 coins to the user

function _exitSystemCoins(address _coinJoin, uint256 _coinsToExit) internal virtual;

_joinCollateral

Joins collateral tokens into the safeEngine

Transfers ERC20 tokens from the user to the proxy, then joins them through the CollateralJoin contract into the destination SAFE

function _joinCollateral(address _collateralJoin, address _safe, uint256 _wad) internal;

_exitCollateral

Exits collateral tokens from the safeEngine

Exits collateral tokens through the CollateralJoin contract, transferring the ERC20 tokens to the user

The exited tokens will be rounded down to collateral decimals precision

function _exitCollateral(address _collateralJoin, uint256 _wad) internal;

onlyDelegateCall

Checks if the call is being made through a delegate call

modifier onlyDelegateCall();

DebtBidActions

Git Source

Inherits: CommonActions, IDebtBidActions

All methods here are executed as delegatecalls from the user's proxy

Functions

decreaseSoldAmount

Place a bid offering to receive a lesser amount of protocol tokens for covering the auctioned debt amount

function decreaseSoldAmount(
  address _coinJoin,
  address _debtAuctionHouse,
  uint256 _auctionId,
  uint256 _soldAmount
) external onlyDelegateCall;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_debtAuctionHouseaddressAddress of the DebtAuctionHouse contract
_auctionIduint256Id of the auction to bid on
_soldAmountuint256Amount of protocol tokens to receive [wad]

settleAuction

Settles an auction, collecting the protocol tokens if the user is the highest bidder

This method will fail if the auction is not finished

function settleAuction(address _coinJoin, address _debtAuctionHouse, uint256 _auctionId) external onlyDelegateCall;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_debtAuctionHouseaddressAddress of the DebtAuctionHouse contract
_auctionIduint256Id of the auction to settle

collectProtocolTokens

Collects the protocol tokens that the proxy has

This method is used to collect protocol tokens from an auction that was settled by another user

function collectProtocolTokens(address _protocolToken) external onlyDelegateCall;

Parameters

NameTypeDescription
_protocolTokenaddressAddress of the protocol token

GlobalSettlementActions

Git Source

Inherits: CommonActions, IGlobalSettlementActions

All methods here are executed as delegatecalls from the user's proxy

Functions

freeCollateral

Free remaining collateral from a SAFE after being processed by the global settlement

function freeCollateral(
  address _manager,
  address _globalSettlement,
  address _collateralJoin,
  uint256 _safeId
) external onlyDelegateCall returns (uint256 _collateralAmount);

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_globalSettlementaddressAddress of the GlobalSettlement contract
_collateralJoinaddressAddress of the CollateralJoin contract
_safeIduint256Id of the SAFE to free collateral from

Returns

NameTypeDescription
_collateralAmountuint256Amount of collateral freed [wad]

prepareCoinsForRedeeming

Prepare coins for redeeming

function prepareCoinsForRedeeming(
  address _globalSettlement,
  address _coinJoin,
  uint256 _coinAmount
) external onlyDelegateCall;

Parameters

NameTypeDescription
_globalSettlementaddressAddress of the GlobalSettlement contract
_coinJoinaddressAddress of the CoinJoin contract
_coinAmountuint256Amount of coins to prepare for redeeming [wad]

redeemCollateral

Redeem collateral tokens from the global settlement

function redeemCollateral(
  address _globalSettlement,
  address _collateralJoin
) external onlyDelegateCall returns (uint256 _collateralAmount);

Parameters

NameTypeDescription
_globalSettlementaddressAddress of the GlobalSettlement contract
_collateralJoinaddressAddress of the CollateralJoin contract

Returns

NameTypeDescription
_collateralAmountuint256Amount of collateral redeemed [wad]

PostSettlementSurplusBidActions

Git Source

Inherits: SurplusBidActions

All methods here are executed as delegatecalls from the user's proxy

Functions

_exitSystemCoins

Exits system coins from the safeEngine

Post settlement it is not possible to exit system coins

function _exitSystemCoins(address, uint256) internal override;

RewardedActions

Git Source

Inherits: CommonActions, IRewardedActions

All methods here are executed as delegatecalls from the user's proxy

Functions

startDebtAuction

Starts a debt auction and transfers the reward to the user

function startDebtAuction(address _accountingJob, address _coinJoin) external onlyDelegateCall;

Parameters

NameTypeDescription
_accountingJobaddressAddress of the AccountingJob contract
_coinJoinaddressAddress of the CoinJoin contract

startSurplusAuction

Starts a surplus auction and transfers the reward to the user

function startSurplusAuction(address _accountingJob, address _coinJoin) external onlyDelegateCall;

Parameters

NameTypeDescription
_accountingJobaddressAddress of the AccountingJob contract
_coinJoinaddressAddress of the CoinJoin contract

popDebtFromQueue

Pops debt from accounting engine's queue and transfers the reward to the user

function popDebtFromQueue(address _accountingJob, address _coinJoin, uint256 _debtTimestamp) external onlyDelegateCall;

Parameters

NameTypeDescription
_accountingJobaddressAddress of the AccountingJob contract
_coinJoinaddressAddress of the CoinJoin contract
_debtTimestampuint256Timestamp of the debt to pop from the queue

transferExtraSurplus

Transfers surplus from accounting engine and transfers the reward to the user

function transferExtraSurplus(address _accountingJob, address _coinJoin) external onlyDelegateCall;

Parameters

NameTypeDescription
_accountingJobaddressAddress of the AccountingJob contract
_coinJoinaddressAddress of the CoinJoin contract

liquidateSAFE

Starts a liquidation and transfers the reward to the user

function liquidateSAFE(
  address _liquidationJob,
  address _coinJoin,
  bytes32 _cType,
  address _safe
) external onlyDelegateCall;

Parameters

NameTypeDescription
_liquidationJobaddressAddress of the LiquidationJob contract
_coinJoinaddressAddress of the CoinJoin contract
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE to liquidate

updateCollateralPrice

Updates the price of a collateral type and transfers the reward to the user

function updateCollateralPrice(address _oracleJob, address _coinJoin, bytes32 _cType) external onlyDelegateCall;

Parameters

NameTypeDescription
_oracleJobaddressAddress of the OracleJob contract
_coinJoinaddressAddress of the CoinJoin contract
_cTypebytes32Bytes32 representation of the collateral type

updateRedemptionRate

Updates the redemption rate and transfers the reward to the user

function updateRedemptionRate(address _oracleJob, address _coinJoin) external onlyDelegateCall;

Parameters

NameTypeDescription
_oracleJobaddressAddress of the OracleJob contract
_coinJoinaddressAddress of the CoinJoin contract

_exitReward

Exits the reward from the job and transfers it to the user

function _exitReward(address _job, address _coinJoin) internal;

Parameters

NameTypeDescription
_jobaddressAddress of the job contract
_coinJoinaddressAddress of the CoinJoin contract

SurplusBidActions

Git Source

Inherits: ISurplusBidActions, CommonActions

All methods here are executed as delegatecalls from the user's proxy

Functions

increaseBidSize

Place a bid offering to provide a higher amount of coins for receiving the auctioned protocol tokens

function increaseBidSize(
  address _surplusAuctionHouse,
  uint256 _auctionId,
  uint256 _bidAmount
) external onlyDelegateCall;

Parameters

NameTypeDescription
_surplusAuctionHouseaddressAddress of the SurplusAuctionHouse contract
_auctionIduint256Id of the auction to bid on
_bidAmountuint256Amount of system coins to bid [wad]

settleAuction

Settles an auction, collecting the system coins if the user is the highest bidder

This method will fail if the auction is not finished

function settleAuction(address _coinJoin, address _surplusAuctionHouse, uint256 _auctionId) external onlyDelegateCall;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_surplusAuctionHouseaddressAddress of the SurplusAuctionHouse contract
_auctionIduint256Id of the auction to settle

HaiProxy

Git Source

Inherits: HaiOwnable2Step, IHaiProxy

This contract is an ownable proxy to execute batched transactions in the protocol contracts

The proxy executes a delegate call to an Actions contract, which have the logic to execute the batched transactions

Functions

constructor

constructor(address _owner) Ownable(_owner);

Parameters

NameTypeDescription
_owneraddressThe owner of the proxy contract

execute

Executes a call to the target contract through a delegate call

The proxy will call the target through a delegate call (the target must not be a direct protocol contract)

function execute(address _target, bytes memory _data) external payable onlyOwner returns (bytes memory _response);

Parameters

NameTypeDescription
_targetaddressAddress of the target Actions contract
_databytesEncoded data of the transaction to execute

Returns

NameTypeDescription
_responsebytesThe raw response of the target call

owner

Emitted when an ownership transfer is initiated

function owner() public view override(HaiOwnable2Step, IHaiOwnable2Step) returns (address _owner);

pendingOwner

The address of the pending owner

function pendingOwner() public view override(HaiOwnable2Step, IHaiOwnable2Step) returns (address _pendingOwner);

renounceOwnership

Leaves the contract without an owner, thereby disabling any functionality that is only available to the owner

It will not be possible to call onlyOwner functions

function renounceOwnership() public override(HaiOwnable2Step, IHaiOwnable2Step) onlyOwner;

transferOwnership

Starts the ownership transfer of the contract to a new account

Replaces the pending transfer if there is one

function transferOwnership(address _newOwner) public override(HaiOwnable2Step, IHaiOwnable2Step) onlyOwner;

Parameters

NameTypeDescription
_newOwneraddressThe address of the new owner

acceptOwnership

Accepts the ownership transfer

Can only be called by the current pending owner

function acceptOwnership() public override(HaiOwnable2Step, IHaiOwnable2Step);

HaiProxyFactory

Git Source

Inherits: IHaiProxyFactory

This contract is used to deploy new HaiProxy instances

State Variables

isProxy

Mapping of proxy addresses to boolean state

mapping(address _proxyAddress => bool _exists) public isProxy;

proxies

Mapping of user addresses to proxy instances

mapping(address _owner => IHaiProxy) public proxies;

nonces

Mapping of the next nonce to be used for the specified owner

mapping(address _owner => uint256 nonce) public nonces;

Functions

build

Deploys a new proxy instance, setting the caller as the owner

function build() external returns (address payable _proxy);

Returns

NameTypeDescription
_proxyaddress payableAddress of the new proxy

build

Deploys a new proxy instance, setting the caller as the owner

function build(address _owner) external returns (address payable _proxy);

Returns

NameTypeDescription
_proxyaddress payableAddress of the new proxy

_build

Internal method used to deploy a new proxy instance

function _build(address _owner) internal returns (address payable _proxy);

HaiSafeManager

Git Source

Inherits: IHaiSafeManager

This contract acts as interface to the SAFEEngine, facilitating the management of SAFEs

This contract is meant to be used by users that interact with the protocol through a proxy contract

State Variables

safeEngine

Address of the SAFEEngine

address public safeEngine;

_safeId

Nonce used to generate safe ids (autoincremental)

uint256 internal _safeId;

_usrSafes

Mapping of user addresses to their enumerable set of safes

mapping(address _safeOwner => EnumerableSet.UintSet) internal _usrSafes;

_usrSafesPerCollat

Mapping of user addresses to their enumerable set of safes per collateral type

mapping(address _safeOwner => mapping(bytes32 _cType => EnumerableSet.UintSet)) internal _usrSafesPerCollat;

_safeData

Mapping of safe ids to their data

mapping(uint256 _safeId => SAFEData) internal _safeData;

safeCan

Mapping of owner and safe permissions to a caller permissions

mapping(address _owner => mapping(uint256 _safeId => mapping(address _caller => bool _ok))) public safeCan;

handlerCan

Mapping of handler to a caller permissions

mapping(address _safeHandler => mapping(address _caller => bool _ok)) public handlerCan;

Functions

safeAllowed

Checks if the sender is the owner of the safe or the safe has permissions to call the function

modifier safeAllowed(uint256 _safe);

Parameters

NameTypeDescription
_safeuint256Id of the safe to check if msg.sender has permissions for

handlerAllowed

Checks if the sender is the safe handler has permissions to call the function

modifier handlerAllowed(address _handler);

Parameters

NameTypeDescription
_handleraddressAddress of the handler to check if msg.sender has permissions for

constructor

constructor(address _safeEngine);

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine

getSafes

Getter for the list of safes owned by a user

function getSafes(address _usr) external view returns (uint256[] memory _safes);

Parameters

NameTypeDescription
_usraddressAddress of the user

Returns

NameTypeDescription
_safesuint256[]List of safe ids owned by the user

getSafes

Getter for the list of safes owned by a user

function getSafes(address _usr, bytes32 _cType) external view returns (uint256[] memory _safes);

Parameters

NameTypeDescription
_usraddressAddress of the user
_cTypebytes32

Returns

NameTypeDescription
_safesuint256[]List of safe ids owned by the user

getSafesData

Getter for the details of the safes owned by a user

function getSafesData(address _usr)
  external
  view
  returns (uint256[] memory _safes, address[] memory _safeHandlers, bytes32[] memory _cTypes);

Parameters

NameTypeDescription
_usraddressAddress of the user

Returns

NameTypeDescription
_safesuint256[]List of safe ids owned by the user
_safeHandlersaddress[]List of safe handlers addresses owned by the user
_cTypesbytes32[]List of collateral types of the safes owned by the user

safeData

Getter for the details of a SAFE

function safeData(uint256 _safe) external view returns (SAFEData memory _sData);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE

Returns

NameTypeDescription
_sDataSAFEDataStruct with the safe data

allowSAFE

Allow/disallow a user address to manage the safe

function allowSAFE(uint256 _safe, address _usr, bool _ok) external safeAllowed(_safe);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_usraddressAddress of the user to allow/disallow
_okboolBoolean state to allow/disallow

allowHandler

Allow/disallow a handler address to manage the safe

function allowHandler(address _usr, bool _ok) external;

Parameters

NameTypeDescription
_usraddressAddress of the user to allow/disallow
_okboolBoolean state to allow/disallow

openSAFE

Open a new safe for a user address

function openSAFE(bytes32 _cType, address _usr) external returns (uint256 _id);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_usraddressAddress of the user to open the safe for

Returns

NameTypeDescription
_iduint256Id of the new SAFE

transferSAFEOwnership

Initiate the transfer of the ownership of a safe to a dst address

function transferSAFEOwnership(uint256 _safe, address _dst) external safeAllowed(_safe);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_dstaddressAddress of the dst address

acceptSAFEOwnership

Accept the transfer of the ownership of a safe

function acceptSAFEOwnership(uint256 _safe) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE

modifySAFECollateralization

Modify a SAFE's collateralization ratio while keeping the generated COIN or collateral freed in the safe handler address

function modifySAFECollateralization(
  uint256 _safe,
  int256 _deltaCollateral,
  int256 _deltaDebt
) external safeAllowed(_safe);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_deltaCollateralint256Delta of collateral to add/remove [wad]
_deltaDebtint256Delta of debt to add/remove [wad]

transferCollateral

Transfer wad amount of safe collateral from the safe address to a dst address

function transferCollateral(uint256 _safe, address _dst, uint256 _wad) external safeAllowed(_safe);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_dstaddressAddress of the dst address
_waduint256Amount of collateral to transfer [wad]

transferCollateral

Transfer wad amount of safe collateral from the safe address to a dst address

function transferCollateral(bytes32 _cType, uint256 _safe, address _dst, uint256 _wad) external safeAllowed(_safe);

Parameters

NameTypeDescription
_cTypebytes32
_safeuint256Id of the SAFE
_dstaddressAddress of the dst address
_waduint256Amount of collateral to transfer [wad]

transferInternalCoins

Transfer an amount of COIN from the safe address to a dst address [rad]

function transferInternalCoins(uint256 _safe, address _dst, uint256 _rad) external safeAllowed(_safe);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_dstaddressAddress of the dst address
_raduint256Amount of COIN to transfer [rad]

quitSystem

Quit the system, migrating the safe (lockedCollateral, generatedDebt) to a different dst handler

function quitSystem(uint256 _safe, address _dst) external safeAllowed(_safe) handlerAllowed(_dst);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_dstaddressAddress of the dst handler

enterSystem

Enter the system, migrating the safe (lockedCollateral, generatedDebt) from a src handler to the safe handler

function enterSystem(address _src, uint256 _safe) external handlerAllowed(_src) safeAllowed(_safe);

Parameters

NameTypeDescription
_srcaddressAddress of the src handler
_safeuint256Id of the SAFE

moveSAFE

Move a position from safeSrc handler to the safeDst handler

function moveSAFE(uint256 _safeSrc, uint256 _safeDst) external safeAllowed(_safeSrc) safeAllowed(_safeDst);

Parameters

NameTypeDescription
_safeSrcuint256Id of the source SAFE
_safeDstuint256Id of the destination SAFE

addSAFE

Add a safe to the user's list of safes (doesn't set safe ownership)

This function is meant to allow the user to add a safe to their list (if it was previously removed)

function addSAFE(uint256 _safe) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE

removeSAFE

Remove a safe from the user's list of safes (doesn't erase safe ownership)

This function is meant to allow the user to remove a safe from their list (if it was added against their will)

function removeSAFE(uint256 _safe) external safeAllowed(_safe);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE

protectSAFE

Choose a safe saviour inside LiquidationEngine for the SAFE

function protectSAFE(uint256 _safe, address _liquidationEngine, address _saviour) external safeAllowed(_safe);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_liquidationEngineaddressAddress of the LiquidationEngine
_saviouraddressAddress of the saviour

SAFEHandler

Git Source

This contract is spawned to provide a unique safe handler address for each user's SAFE

When a new SAFE is created inside HaiSafeManager, this contract is deployed and calls the SAFEEngine to add permissions to the SAFE manager

Functions

constructor

Grants permissions to the SAFE manager to modify the SAFE of this contract's address

constructor(address _safeEngine);

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract

Contents

GlobalSettlement

Git Source

Inherits: Authorizable, Modifiable, Disableable, IGlobalSettlement

This contract is responsible for processing the system settlement, a stateful process that takes place over nine steps.

System shutdown:

We must freeze the system and start the cooldown period before we can process any system state. In particular, oracle prices are frozen, and no more debt can be generated from the SAFEEngine.

  1. shutdownSystem()
  • freeze the system and start the cooldown period
  1. freezeCollateralType(_cType)
  • reads and store the final price for each collateral type
  • initializes collateralTotalDebt to the total debt registered in safe engine

Cooldown period:

We must process some system state before it is possible to calculate the final coin / collateral price. In particular, we need to determine:

  • (a) collateralShortfall (considers under-collateralized SAFEs)
  • (b) outstandingCoinSupply (after including system surplus / deficit)
  • We determine (a) by processing all under-collateralized SAFEs.
  • We determine (b) by processing ongoing coin generating processes, i.e. auctions. We need to ensure that auctions will not generate any further coin income.
  1. processSAFE(_cType, _safe)
  • confiscates SAFE debt and backing collateral (excess of collateral remains).
  1. Auctions at SAH and DAH can be terminated prematurely, while CAH auctions are handled by this contract
  • 4.a. SAH.terminateAuctionPrematurely(_id)
  • settles the auction
  • transfers the surplus to the highest bidder
  • 4.b. DAH.terminateAuctionPrematurely(_id)
  • settles the auction
  • returns the coins to the highest bidder
  • registers the unbacked debt at the accounting engine
  • 4.c. this.fastTrackAuction(_cType, _id)
  • settles the auction: returns collateral and debt to the SAFE
  • registers returned debt in collateralTotalDebt

When an overcollateralized SAFE has been processed and has no debt remaining, the remaining collateral can be withdrawn:

  1. freeCollateral(_cType)
  • remove collateral from the caller's SAFE (requires SAFE to have no debt)

After cooldown period:

We enable calculation of the final price for each collateral type. Requires accounting engine to have no surplus.

  1. setOutstandingCoinSupply()
  • fixes the total outstanding supply of coin
  1. calculateCashPrice(_cType)
  • calculate collateralCashPrice adjusted in the case of deficit / surplus

Redeeming:

At this point we have computed the final price for each collateral type and coin holders can now turn their coin into collateral.

  1. prepareCoinsForRedeeming(_wad)
  • deposit the amount of coins to redeem in caller's accountance
  • Each unit of coin can claim a proportional amount of all of the system's collateral
  • At any point a user can get and prepare more coins to redeem for more collateral
  1. redeemCollateral(_cType, _wad)
  • claim tokens from a specific collateral type given the amount of coins caller has deposited
  • The amount of collateral to redeem depends exclusively in the state variables calculated in the previous steps
  • The amount of collaterals left when all circulating coins are redeemed should be 0

State Variables

shutdownTime

The timestamp when settlement was triggered

uint256 public shutdownTime;

outstandingCoinSupply

The outstanding coin supply computed during the settlement process [rad]

uint256 public outstandingCoinSupply;

finalCoinPerCollateralPrice

The final coin per collateral price computed during the settlement process

mapping(bytes32 _cType => uint256 _ray) public finalCoinPerCollateralPrice;

collateralShortfall

The total amount of bad debt for a collateral type computed during the settlement process

mapping(bytes32 _cType => uint256 _wad) public collateralShortfall;

collateralTotalDebt

The total amount of debt for a collateral type computed during the settlement process

mapping(bytes32 _cType => uint256 _wad) public collateralTotalDebt;

collateralCashPrice

Final collateral cash price computed during the settlement process, accounting for surplus / shortfall

mapping(bytes32 _cType => uint256 _ray) public collateralCashPrice;

coinBag

Mapping containing the total amount of coins a user has prepared for redeeming

mapping(address _usr => uint256 _wad) public coinBag;

coinsUsedToRedeem

Mapping containing the total amount of coins a user has used to redeem collateral

mapping(bytes32 _cType => mapping(address _usr => uint256 _wad)) public coinsUsedToRedeem;

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

liquidationEngine

Address of the LiquidationEngine contract

ILiquidationEngine public liquidationEngine;

oracleRelayer

Address of the OracleRelayer contract

IOracleRelayer public oracleRelayer;

coinJoin

Address of the CoinJoin contract

IDisableable public coinJoin;

collateralJoinFactory

Address of the CollateralJoinFactory contract

IDisableable public collateralJoinFactory;

collateralAuctionHouseFactory

Address of the CollateralAuctionHouseFactory contract

IDisableable public collateralAuctionHouseFactory;

stabilityFeeTreasury

Address of the StabilityFeeTreasury contract

IDisableable public stabilityFeeTreasury;

accountingEngine

Address of the AccountingEngine contract

IDisableable public accountingEngine;

_params

Getter for the unpacked contract parameters struct

GlobalSettlementParams public _params;

Functions

params

Getter for the contract parameters struct

function params() external view returns (GlobalSettlementParams memory _globalSettlementParams);

Returns

NameTypeDescription
_globalSettlementParamsGlobalSettlementParamsGlobalSettlement parameters struct

constructor

constructor(
  address _safeEngine,
  address _liquidationEngine,
  address _oracleRelayer,
  address _coinJoin,
  address _collateralJoinFactory,
  address _collateralAuctionHouseFactory,
  address _stabilityFeeTreasury,
  address _accountingEngine,
  GlobalSettlementParams memory _gsParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_liquidationEngineaddressAddress of the LiquidationEngine contract
_oracleRelayeraddressAddress of the OracleRelayer contract
_coinJoinaddressAddress of the CoinJoin contract
_collateralJoinFactoryaddressAddress of the CollateralJoinFactory contract
_collateralAuctionHouseFactoryaddressAddress of the CollateralAuctionHouseFactory contract
_stabilityFeeTreasuryaddressAddress of the StabilityFeeTreasury contract
_accountingEngineaddressAddress of the AccountingEngine contract
_gsParamsGlobalSettlementParamsInitial valid GlobalSettlement parameters struct

_onContractDisable

Internal virtual method to be called when the contract is disabled

Method override avoids externally disabling this contract

function _onContractDisable() internal pure override;

shutdownSystem

Freeze the system and start the cooldown period

This function switches the whenEnabled/whenDisabled modifiers across the system contracts

function shutdownSystem() external isAuthorized whenEnabled;

freezeCollateralType

Calculate a collateral type's final price according to the latest system coin redemption price

function freezeCollateralType(bytes32 _cType) external whenDisabled;

Parameters

NameTypeDescription
_cTypebytes32The collateral type to calculate the price for

fastTrackAuction

Fast track an ongoing collateral auction

function fastTrackAuction(bytes32 _cType, uint256 _auctionId) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral type associated with the auction contract
_auctionIduint256The ID of the auction to be fast tracked

processSAFE

Cancel a SAFE's debt and leave any extra collateral in it

function processSAFE(bytes32 _cType, address _safe) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral type associated with the SAFE
_safeaddressThe SAFE to be processed

freeCollateral

Remove collateral from the caller's SAFE (requires SAFE to have no debt)

function freeCollateral(bytes32 _cType) external whenDisabled;

Parameters

NameTypeDescription
_cTypebytes32The collateral type to free

setOutstandingCoinSupply

Set the final outstanding supply of system coins

There must be no remaining surplus in the accounting engine

function setOutstandingCoinSupply() external whenDisabled;

calculateCashPrice

Calculate a collateral's price taking into consideration system surplus/deficit and the finalCoinPerCollateralPrice

function calculateCashPrice(bytes32 _cType) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral whose cash price will be calculated

prepareCoinsForRedeeming

Add coins into a 'bag' so that you can use them to redeem collateral

function prepareCoinsForRedeeming(uint256 _coinAmount) external;

Parameters

NameTypeDescription
_coinAmountuint256The amount of internal system coins to add into the bag

redeemCollateral

Redeem a specific collateral type using an amount of internal system coins from your bag

function redeemCollateral(bytes32 _cType, uint256 _coinsAmount) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral type to redeem
_coinsAmountuint256The amount of internal coins to use from your bag

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override whenEnabled;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

PostSettlementSurplusAuctionHouse

Git Source

Inherits: Authorizable, Modifiable, IPostSettlementSurplusAuctionHouse

This contract enables the sell of system coins in exchange for protocol tokens after Global Settlement is triggered

The reason to auction the post settlement surplus is to avoid incentives to trigger Global Settlement if the system has a surplus

State Variables

AUCTION_HOUSE_TYPE

bytes32 public constant AUCTION_HOUSE_TYPE = bytes32('SURPLUS');

_auctions

Raw data of an auction

mapping(uint256 => Auction) public _auctions;

auctionsStarted

Total amount of surplus auctions created

uint256 public auctionsStarted;

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

protocolToken

Address of the ProtocolToken contract

IProtocolToken public protocolToken;

_params

Getter for the unpacked contract parameters struct

PostSettlementSAHParams public _params;

Functions

auctions

Data of an auction

function auctions(uint256 _id) external view returns (Auction memory _auction);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_auctionAuctionAuction data struct

params

Getter for the contract parameters struct

function params() external view returns (PostSettlementSAHParams memory _pssahParams);

Returns

NameTypeDescription
_pssahParamsPostSettlementSAHParamsThe contract parameters struct

constructor

constructor(
  address _safeEngine,
  address _protocolToken,
  PostSettlementSAHParams memory _pssahParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_protocolTokenaddressAddress of the ProtocolToken contract
_pssahParamsPostSettlementSAHParamsInitial valid PostSettlementSAH parameters struct

startAuction

Start a new surplus auction

function startAuction(uint256 _amountToSell, uint256 _initialBid) external isAuthorized returns (uint256 _id);

Parameters

NameTypeDescription
_amountToSelluint256Total amount of system coins to sell [rad]
_initialBiduint256Initial protocol token bid [wad]

Returns

NameTypeDescription
_iduint256ID of the started auction

restartAuction

Restart an auction if no bids were submitted for it

function restartAuction(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256ID of the auction to restart

increaseBidSize

Submit a higher protocol token bid for the same amount of system coins

function increaseBidSize(uint256 _id, uint256 _bid) external;

Parameters

NameTypeDescription
_iduint256ID of the auction you want to submit the bid for
_biduint256New bid submitted [wad]

settleAuction

Settle/finish an auction

function settleAuction(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256ID of the auction to settle

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

SettlementSurplusAuctioneer

Git Source

Inherits: Authorizable, Modifiable, ISettlementSurplusAuctioneer

This contract receives post-settlement surplus coins from the AccountingEngine and starts auctions for them

State Variables

lastSurplusTime

The last time when this contract triggered a surplus auction

uint256 public lastSurplusTime;

accountingEngine

The address of the AccountingEngine

IAccountingEngine public accountingEngine;

surplusAuctionHouse

The address of the SurplusAuctionHouse

ISurplusAuctionHouse public surplusAuctionHouse;

safeEngine

The address of the SAFEEngine

ISAFEEngine public safeEngine;

Functions

constructor

constructor(address _accountingEngine, address _surplusAuctionHouse) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_accountingEngineaddressAddress of the AccountingEngine
_surplusAuctionHouseaddressAddress of the SurplusAuctionHouse

auctionSurplus

Starts a new surplus auction

The contract reads surplus auction parameters from the AccountingEngine

function auctionSurplus() external returns (uint256 _id);

Returns

NameTypeDescription
_iduint256The id of the started auction

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_setSurplusAuctionHouse

Sets the SurplusAuctionHouse, revoking the previous one permissions and approving the new one

function _setSurplusAuctionHouse(address _address) internal;

Contents

ProtocolToken

Git Source

Inherits: ERC20, ERC20Permit, ERC20Votes, ERC20Pausable, Authorizable, IProtocolToken

This contract represents the protocol ERC20Votes token to be used for governance purposes

Functions

constructor

constructor(
  string memory _name,
  string memory _symbol
) ERC20(_name, _symbol) ERC20Permit(_name) Authorizable(msg.sender);

Parameters

NameTypeDescription
_namestringString with the name of the token
_symbolstringString with the symbol of the token

mint

Mint an amount of tokens to an account

Only authorized addresses can mint tokens

function mint(address _dst, uint256 _wad) external isAuthorized;

Parameters

NameTypeDescription
_dstaddress
_waduint256

burn

Burn an amount of tokens from the sender

function burn(uint256 _wad) external;

Parameters

NameTypeDescription
_waduint256

unpause

Unpause the token transfers, minting and burning

Only authorized addresses can unpause the token

function unpause() external isAuthorized;

_update

function _update(address _from, address _to, uint256 _value) internal override(ERC20, ERC20Votes, ERC20Pausable);

nonces

function nonces(address _owner) public view override(ERC20Permit, IERC20Permit, Nonces) returns (uint256 _nonce);

clock

Set the clock to block timestamp, as opposed to the default block number.

function clock() public view override returns (uint48 _timestamp);

CLOCK_MODE

function CLOCK_MODE() public view virtual override returns (string memory _mode);

SystemCoin

Git Source

Inherits: ERC20, ERC20Permit, Authorizable, ISystemCoin

This contract represents the system coin ERC20 token to be used outside the system

Functions

constructor

constructor(
  string memory _name,
  string memory _symbol
) ERC20(_name, _symbol) ERC20Permit(_name) Authorizable(msg.sender);

Parameters

NameTypeDescription
_namestringString with the name of the token
_symbolstringString with the symbol of the token

mint

Mint an amount of tokens to an account

Only authorized addresses can mint tokens

function mint(address _dst, uint256 _wad) external isAuthorized;

Parameters

NameTypeDescription
_dstaddress
_waduint256

burn

Burn an amount of tokens from the sender

function burn(uint256 _wad) external;

Parameters

NameTypeDescription
_waduint256

TokenDistributor

Git Source

Inherits: Authorizable, ITokenDistributor

This contract allows users to claim tokens from a merkle tree proof

State Variables

token

Address of the ERC20 token to be distributed

IProtocolToken public token;

root

The merkle root of the token distribution

bytes32 public root;

totalClaimable

Total amount of tokens to be distributed

uint256 public totalClaimable;

claimPeriodStart

Timestamp when the claim period starts

uint256 public claimPeriodStart;

claimPeriodEnd

Timestamp when the claim period ends

uint256 public claimPeriodEnd;

claimed

Mapping containing the users that have already claimed

mapping(address _user => bool _hasClaimed) public claimed;

Functions

constructor

constructor(address _token, TokenDistributorParams memory _tokenDistributorParams) Authorizable(msg.sender);

Parameters

NameTypeDescription
_tokenaddressAddress of the ERC20 token to be distributed
_tokenDistributorParamsTokenDistributorParamsTokenDistributor valid parameters struct

canClaim

Checks if a user can claim tokens

function canClaim(bytes32[] calldata _proof, address _user, uint256 _amount) external view returns (bool _claimable);

Parameters

NameTypeDescription
_proofbytes32[]Array of bytes32 merkle proof hashes
_useraddressAddress of the user to check
_amountuint256Amount of tokens to check

Returns

NameTypeDescription
_claimableboolWhether the user can claim the amount with the proof provided

claim

Claims tokens from the distributor

function claim(bytes32[] calldata _proof, uint256 _amount) external;

Parameters

NameTypeDescription
_proofbytes32[]Array of bytes32 merkle proof hashes
_amountuint256Amount of tokens to claim

claimAndDelegate

Claims tokens from the distributor and delegates them using a signature

function claimAndDelegate(
  bytes32[] calldata _proof,
  uint256 _amount,
  address _delegatee,
  uint256 _expiry,
  uint8 _v,
  bytes32 _r,
  bytes32 _s
) external;

Parameters

NameTypeDescription
_proofbytes32[]Array of bytes32 merkle proof hashes
_amountuint256Amount of tokens to claim
_delegateeaddressAddress to delegate the token votes to
_expiryuint256Expiration timestamp of the signature
_vuint8Recovery byte of the signature
_rbytes32ECDSA signature r value
_sbytes32ECDSA signature s value

sweep

Withdraws tokens from the distributor to a given address after the claim period has ended

function sweep(address _sweepReceiver) external override isAuthorized;

Parameters

NameTypeDescription
_sweepReceiveraddressAddress to send the tokens to

_canClaim

function _canClaim(bytes32[] calldata _proof, address _user, uint256 _amount) internal view returns (bool _claimable);

_claim

function _claim(bytes32[] calldata _proof, uint256 _amount) internal;

Contents

Authorizable

Git Source

Inherits: IAuthorizable

Implements authorization control for contracts

Authorization control is boolean and handled by isAuthorized modifier

State Variables

_authorizedAccounts

EnumerableSet of authorized accounts

EnumerableSet.AddressSet internal _authorizedAccounts;

Functions

constructor

constructor(address _account);

Parameters

NameTypeDescription
_accountaddressInitial account to add authorization to

authorizedAccounts

Checks whether an account is authorized

function authorizedAccounts(address _account) external view returns (bool _authorized);

Returns

NameTypeDescription
_authorizedboolWhether the account is authorized or not

authorizedAccounts

Getter for the authorized accounts

function authorizedAccounts() external view returns (address[] memory _accounts);

Returns

NameTypeDescription
_accountsaddress[]Array of authorized accounts

addAuthorization

Add auth to an account

function addAuthorization(address _account) external virtual isAuthorized;

Parameters

NameTypeDescription
_accountaddressAccount to add auth to

removeAuthorization

Remove auth from an account

function removeAuthorization(address _account) external virtual isAuthorized;

Parameters

NameTypeDescription
_accountaddressAccount to remove auth from

_addAuthorization

function _addAuthorization(address _account) internal;

_removeAuthorization

function _removeAuthorization(address _account) internal;

_isAuthorized

function _isAuthorized(address _account) internal view virtual returns (bool _authorized);

isAuthorized

Checks whether msg.sender can call an authed function

Will revert with Unauthorized if the sender is not authorized

modifier isAuthorized();

CoinJoin

Git Source

Inherits: Authorizable, Disableable, ICoinJoin

This contract allows to connect the SAFEEngine with the system coin

This contract needs to be authorized in Coin and SAFEEngine

State Variables

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

systemCoin

Address of the SystemCoin contract

ISystemCoin public systemCoin;

decimals

Number of decimals the coin has

uint256 public decimals;

Functions

constructor

constructor(address _safeEngine, address _systemCoin) Authorizable(msg.sender);

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_systemCoinaddressAddress of the SystemCoin contract

join

Join system coins in the system

Exited coins have 18 decimals but inside the system they have 45 [rad] decimals. When we join, the amount [wad] is multiplied by 10**27 [ray]

function join(address _account, uint256 _wad) external;

Parameters

NameTypeDescription
_accountaddressAccount that will receive the joined coins
_waduint256Amount of external coins to join [wad]

exit

Exit system coins from the system

New coins cannot be minted after the system is disabled

function exit(address _account, uint256 _wad) external whenEnabled;

Parameters

NameTypeDescription
_accountaddressAccount that will receive the exited coins
_waduint256Amount of internal coins to join (18 decimal number)

CollateralJoin

Git Source

Inherits: Disableable, ICollateralJoin

This contract allows to connect the SAFEEngine to arbitrary external token implementations

For well behaved ERC20 tokens with less than 18 decimals. All Join adapters need to implement two basic methods: join and exit

State Variables

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

collateral

Address of the ERC20 collateral token contract

IERC20Metadata public collateral;

collateralType

The collateral type that this contract handles

bytes32 public collateralType;

decimals

Number of decimals of the collateral token

uint256 public decimals;

multiplier

Multiplier used to transform collateral into 18 decimals within the system

uint256 public multiplier;

Functions

constructor

constructor(address _safeEngine, bytes32 _cType, address _collateral) Authorizable(msg.sender);

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_cTypebytes32Bytes32 representation of the collateral type
_collateraladdressAddress of the ERC20 collateral token

join

Join collateral in the system

This function locks collateral in the adapter and creates a representation of the locked collateral inside the system. The representation uses 18 decimals.

function join(address _account, uint256 _wei) external whenEnabled;

Parameters

NameTypeDescription
_accountaddressAccount to which we add collateral into the system
_weiuint256Amount of collateral to transfer in the system (represented as a number with token decimals)

exit

Exit collateral from the system

This function destroys the collateral representation from inside the system and exits the collateral from this adapter. The transferred collateral uses the same decimals as the original collateral token.

function exit(address _account, uint256 _wei) external;

Parameters

NameTypeDescription
_accountaddressAccount to which we transfer the collateral out of the system
_weiuint256Amount of collateral to transfer to account (represented as a number with token decimals)

Disableable

Git Source

Inherits: IDisableable, Authorizable

This abstract contract provides the ability to disable the inheriting contract, triggering (if implemented) an on-disable routine hook.

This contract also implements whenEnabled and whenDisabled modifiers to restrict the methods that can be called on each state.

State Variables

contractEnabled

Check if the contract is enabled

bool public contractEnabled = true;

Functions

disableContract

External method to trigger the contract disablement

Triggers an internal call to _onContractDisable virtual method

function disableContract() external isAuthorized whenEnabled;

_onContractDisable

Internal virtual method to be called when the contract is disabled

This method is virtual and should be overriden to implement

function _onContractDisable() internal virtual;

_isEnabled

Internal virtual view to check if the contract is enabled

This method is virtual and could be overriden for non-standard implementations

function _isEnabled() internal view virtual returns (bool _enabled);

whenEnabled

Allows method calls only when the contract is enabled

modifier whenEnabled();

whenDisabled

Allows method calls only when the contract is disabled

modifier whenDisabled();

HaiOwnable2Step

Git Source

Inherits: Ownable2Step, IHaiOwnable2Step

This abstract contract inherits Ownable2Step

Functions

owner

Emitted when an ownership transfer is initiated

function owner() public view virtual override(Ownable, IHaiOwnable2Step) returns (address _owner);

pendingOwner

The address of the pending owner

function pendingOwner() public view virtual override(Ownable2Step, IHaiOwnable2Step) returns (address _pendingOwner);

renounceOwnership

Leaves the contract without an owner, thereby disabling any functionality that is only available to the owner

It will not be possible to call onlyOwner functions

function renounceOwnership() public virtual override(Ownable, IHaiOwnable2Step) onlyOwner;

transferOwnership

Starts the ownership transfer of the contract to a new account

Replaces the pending transfer if there is one

function transferOwnership(address _newOwner) public virtual override(Ownable2Step, IHaiOwnable2Step) onlyOwner;

Parameters

NameTypeDescription
_newOwneraddressThe address of the new owner

acceptOwnership

Accepts the ownership transfer

Can only be called by the current pending owner

function acceptOwnership() public virtual override(Ownable2Step, IHaiOwnable2Step);

Modifiable

Git Source

Inherits: Authorizable, IModifiable

Allows inheriting contracts to modify parameters values

Requires inheriting contracts to override _modifyParameters virtual methods

State Variables

_GLOBAL_PARAM

Used to emit a global parameter modification event

bytes32 internal constant _GLOBAL_PARAM = bytes32(0);

Functions

modifyParameters

Set a new value for a global specific parameter

function modifyParameters(bytes32 _param, bytes memory _data) external isAuthorized validParams;

Parameters

NameTypeDescription
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal virtual;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view virtual;

validParams

Triggers a routine to validate parameters after a modification

modifier validParams();

ModifiablePerCollateral

Git Source

Inherits: Authorizable, IModifiablePerCollateral

Allows inheriting contracts to modify parameters values and initialize collateral types

Requires inheriting contracts to override _modifyParameters virtual methods and implement _initializeCollateralType

State Variables

_collateralList

EnumerableSet.Bytes32Set internal _collateralList;

Functions

collateralList

List of all the collateral types registered in the OracleRelayer

function collateralList() external view returns (bytes32[] memory __collateralList);

Returns

NameTypeDescription
__collateralListbytes32[]Array of all the collateral types registered

initializeCollateralType

Register a new collateral type in the SAFEEngine

function initializeCollateralType(
  bytes32 _cType,
  bytes memory _collateralParams
) public virtual isAuthorized validCParams(_cType);

Parameters

NameTypeDescription
_cTypebytes32Collateral type to register
_collateralParamsbytesCollateral parameters

modifyParameters

Set a new value for a collateral specific parameter

function modifyParameters(
  bytes32 _cType,
  bytes32 _param,
  bytes memory _data
) external isAuthorized validCParams(_cType);

Parameters

NameTypeDescription
_cTypebytes32String identifier of the collateral to modify
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

_modifyParameters

Set a new value for a collateral specific parameter

function _modifyParameters(bytes32 _cType, bytes32 _param, bytes memory _data) internal virtual;

Parameters

NameTypeDescription
_cTypebytes32String identifier of the collateral to modify
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

_initializeCollateralType

Register a new collateral type in the SAFEEngine

function _initializeCollateralType(bytes32 _cType, bytes memory _collateralParams) internal virtual;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to register
_collateralParamsbytesCollateral parameters

_validateCParameters

Internal function to be overriden with custom logic to validate collateral parameters

function _validateCParameters(bytes32 _cType) internal view virtual;

validCParams

Triggers a routine to validate collateral parameters after a modification

modifier validCParams(bytes32 _cType);

AccountingEngine

Git Source

Inherits: Authorizable, Modifiable, Disableable, IAccountingEngine

This contract is responsible for handling protocol surplus and debt

It allows the system to auction surplus and debt, as well as transfer surplus

This is a system contract, therefore it is not meant to be used by users directly

State Variables

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

surplusAuctionHouse

Address of the SurplusAuctionHouse contract

ISurplusAuctionHouse public surplusAuctionHouse;

debtAuctionHouse

Address of the DebtAuctionHouse contract

IDebtAuctionHouse public debtAuctionHouse;

postSettlementSurplusDrain

The post settlement surplus drain is used to transfer remaining surplus after settlement is triggered

Usually the SettlementSurplusAuctioneer contract

address public postSettlementSurplusDrain;

extraSurplusReceiver

The extra surplus receiver is used to transfer surplus if is not being auctioned

address public extraSurplusReceiver;

_params

Getter for the unpacked contract parameters struct

AccountingEngineParams public _params;

debtQueue

A mapping storing debtBlocks that need to be covered by auctions

A debtBlock can be popped from the queue (to be auctioned) if more than popDebtDelay has elapsed since creation

mapping(uint256 _timestamp => uint256 _rad) public debtQueue;

totalOnAuctionDebt

The total amount of debt that is currently on auction in the DebtAuctionHouse

uint256 public totalOnAuctionDebt;

totalQueuedDebt

The total amount of debt that is currently in the debtQueue to be auctioned

uint256 public totalQueuedDebt;

lastSurplusTime

The timestamp of the last time surplus was transferred or auctioned

uint256 public lastSurplusTime;

disableTimestamp

When the contract is disabled (usually by GlobalSettlement) it has to wait disableCooldown before any remaining surplus can be transferred to postSettlementSurplusDrain

uint256 public disableTimestamp;

Functions

addAuthorization

Overriding method allows new authorizations only if the contract is enabled

Method will revert if the account is already authorized

function addAuthorization(address _account) external override(Authorizable, IAuthorizable) isAuthorized whenEnabled;

Parameters

NameTypeDescription
_accountaddressThe account to authorize

params

Getter for the contract parameters struct

function params() external view returns (AccountingEngineParams memory _accEngineParams);

Returns

NameTypeDescription
_accEngineParamsAccountingEngineParams_params AccountingEngine parameters struct

constructor

constructor(
  address _safeEngine,
  address _surplusAuctionHouse,
  address _debtAuctionHouse,
  AccountingEngineParams memory _accEngineParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine
_surplusAuctionHouseaddressAddress of the SurplusAuctionHouse
_debtAuctionHouseaddressAddress of the DebtAuctionHouse
_accEngineParamsAccountingEngineParamsInitial valid AccountingEngine parameters struct

unqueuedUnauctionedDebt

Returns the amount of bad debt that is not in the debtQueue and is not currently handled by debt auctions

The difference between the debt in the SAFEEngine and the debt in the debtQueue and on auction

function unqueuedUnauctionedDebt() external view returns (uint256 __unqueuedUnauctionedDebt);

Returns

NameTypeDescription
__unqueuedUnauctionedDebtuint256_unqueuedUnauctionedDebt Amount of debt in RAD that is currently not in the debtQueue and not on auction [rad]

_unqueuedUnauctionedDebt

function _unqueuedUnauctionedDebt(uint256 _debtBalance) internal view returns (uint256 __unqueuedUnauctionedDebt);

pushDebtToQueue

Push a block of debt to the debt queue

Usually called by the LiquidationEngine when a SAFE is liquidated

function pushDebtToQueue(uint256 _debtBlock) external isAuthorized;

Parameters

NameTypeDescription
_debtBlockuint256Amount of debt to push [rad]

popDebtFromQueue

Pop a block of debt from the debt queue

A debtBlock can be popped from the queue after popDebtDelay seconds have passed since creation

function popDebtFromQueue(uint256 _debtBlockTimestamp) external;

Parameters

NameTypeDescription
_debtBlockTimestampuint256Timestamp of the block of debt that should be popped out

settleDebt

Destroy an equal amount of coins and debt

It can only destroy debt that is not locked in the queue and also not in a debt auction (unqueuedUnauctionedDebt)

function settleDebt(uint256 _rad) external;

Parameters

NameTypeDescription
_raduint256Amount of coins & debt to destroy [rad]

_settleDebt

function _settleDebt(
  uint256 _coinBalance,
  uint256 _debtBalance,
  uint256 _rad
) internal returns (uint256 _newCoinBalance, uint256 _newDebtBalance);

cancelAuctionedDebtWithSurplus

Use surplus coins to destroy debt that was in a debt auction

Usually called by the DebtAuctionHouse after a debt bid is made

function cancelAuctionedDebtWithSurplus(uint256 _rad) external;

Parameters

NameTypeDescription
_raduint256Amount of coins & debt to destroy with surplus [rad]

auctionDebt

Start a debt auction (print protocol tokens in exchange for coins so that the system can be recapitalized)

It can only auction debt that has been popped from the debt queue and is not already being auctioned

function auctionDebt() external returns (uint256 _id);

Returns

NameTypeDescription
_iduint256Id of the debt auction that was started

auctionSurplus

Start a surplus auction (sell surplus stability fees for protocol tokens)

It can only auction surplus if surplusIsTransferred is set to false

function auctionSurplus() external returns (uint256 _id);

Returns

NameTypeDescription
_iduint256Id of the surplus auction that was started

transferExtraSurplus

Transfer surplus to an address as an alternative to surplus auctions

It can only transfer surplus if surplusIsTransferred is set to true

function transferExtraSurplus() external;

_onContractDisable

Runtime to be run when the contract is disabled (normally triggered by GlobalSettlement)

When it's being disabled, the contract will record the current timestamp. Afterwards, the contract tries to settle as much debt as possible (if there's any) with any surplus that's left in the AccountingEngine

function _onContractDisable() internal override;

transferPostSettlementSurplus

Transfer any remaining surplus after the disable cooldown has passed. Meant to be a backup in case GlobalSettlement.processSAFE has a bug, governance doesn't have power over the system and there's still surplus left in the AccountingEngine which then blocks GlobalSettlement.setOutstandingCoinSupply.

Transfer any remaining surplus after disableCooldown seconds have passed since disabling the contract

function transferPostSettlementSurplus() external whenDisabled;

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_setSurplusAuctionHouse

Set the surplus auction house, deny permissions on the old one and approve on the new one

function _setSurplusAuctionHouse(address _surplusAuctionHouse) internal;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

CollateralAuctionHouse

Git Source

Inherits: Authorizable, Modifiable, Disableable, ICollateralAuctionHouse

This contract enables the sell of a confiscated collateral in exchange for system coins to cover a SAFE's debt

State Variables

AUCTION_HOUSE_TYPE

Type of the auction house

bytes32 public constant AUCTION_HOUSE_TYPE = bytes32('COLLATERAL');

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

_liquidationEngine

Internal storage variable to allow overrides in child implementation contract

ILiquidationEngine internal _liquidationEngine;

_oracleRelayer

Internal storage variable to allow overrides in child implementation contract

IOracleRelayer internal _oracleRelayer;

collateralType

The collateral type of the auctions created by this contract

bytes32 public collateralType;

auctionsStarted

Total amount of collateral auctions created

uint256 public auctionsStarted;

_auctions

Unpacked data of an auction

mapping(uint256 _auctionId => Auction) public _auctions;

_params

Getter for the unpacked contract parameters struct

CollateralAuctionHouseParams public _params;

Functions

liquidationEngine

Address of the LiquidationEngine contract

function liquidationEngine() public view virtual returns (ILiquidationEngine __liquidationEngine);

oracleRelayer

Address of the OracleRelayer contract

function oracleRelayer() public view virtual returns (IOracleRelayer __oracleRelayer);

auctions

Data of an auction

function auctions(uint256 _auctionId) external view returns (Auction memory _auction);

Parameters

NameTypeDescription
_auctionIduint256Id of the auction

Returns

NameTypeDescription
_auctionAuctionAuction data struct

params

Getter for the contract parameters struct

function params() external view returns (CollateralAuctionHouseParams memory _cahParams);

Returns

NameTypeDescription
_cahParamsCollateralAuctionHouseParamsAuction house parameters struct

constructor

constructor(
  address _safeEngine,
  address __liquidationEngine,
  address __oracleRelayer,
  bytes32 _cType,
  CollateralAuctionHouseParams memory _cahParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
__liquidationEngineaddressAddress of the LiquidationEngine contract
__oracleRelayeraddressAddress of the OracleRelayer contract
_cTypebytes32Bytes32 representation of the collateral type
_cahParamsCollateralAuctionHouseParamsInitial valid CollateralAuctionHouse parameters struct

_getBoughtCollateral

Get the amount of bought collateral from a specific auction using collateral and system coin prices, with a custom discount

The inputted bid is capped to the amount of system coins needed to buy all collateral

function _getBoughtCollateral(
  uint256 _collateralPrice,
  uint256 _systemCoinPrice,
  uint256 _amountToSell,
  uint256 _adjustedBid,
  uint256 _customDiscount
) internal pure returns (uint256 _boughtCollateral, uint256 _readjustedBid);

Parameters

NameTypeDescription
_collateralPriceuint256The collateral price fetched from the Oracle
_systemCoinPriceuint256The system coin redemption price fetched from the OracleRelayer
_amountToSelluint256The amount of collateral being auctioned
_adjustedBiduint256The limited system coin bid
_customDiscountuint256The discount offered

Returns

NameTypeDescription
_boughtCollateraluint256Amount of collateral bought for given parameters
_readjustedBiduint256Amount of system coins actually used to buy the collateral

_getCollateralPrice

Get the collateral price from the oracle

function _getCollateralPrice() internal view returns (uint256 _collateralPrice);

Returns

NameTypeDescription
_collateralPriceuint256The collateral price if valid [wad]

_getAuctionDiscount

Get the upcoming discount that will be used in a specific auction

function _getAuctionDiscount(uint256 _id) internal view returns (uint256 _auctionDiscount);

Parameters

NameTypeDescription
_iduint256The ID of the auction to calculate the upcoming discount for

Returns

NameTypeDescription
_auctionDiscountuint256The upcoming discount that will be used in the targeted auction

_getAdjustedBid

Get the actual bid that will be used in an auction (taking into account the bidder input)

The inputted bid is capped to the amount of system coins the auction needs to raise

function _getAdjustedBid(uint256 _id, uint256 _wad) internal view returns (uint256 _adjustedBid);

Parameters

NameTypeDescription
_iduint256The id of the auction to calculate the adjusted bid for
_waduint256The initial bid submitted

Returns

NameTypeDescription
_adjustedBiduint256The adjusted bid

startAuction

Starts a new collateral auction

function startAuction(
  address _forgoneCollateralReceiver,
  address _auctionIncomeRecipient,
  uint256 _amountToRaise,
  uint256 _amountToSell
) external isAuthorized whenEnabled returns (uint256 _id);

Parameters

NameTypeDescription
_forgoneCollateralReceiveraddressWho receives leftover collateral that is not sold in the auction (usually the liquidated SAFE)
_auctionIncomeRecipientaddressWho receives the coins raised by the auction (usually the AccountingEngine)
_amountToRaiseuint256Total/max amount of coins to raise [rad]
_amountToSelluint256

Returns

NameTypeDescription
_iduint256Id of the started auction

getAuctionDiscount

Calculates the current discount of an auction

function getAuctionDiscount(uint256 _id) external view returns (uint256 _auctionDiscount);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_auctionDiscountuint256Current discount of the auction [wad %]

getCollateralBought

Calculates the amount of collateral that will be bought with a given bid

function getCollateralBought(
  uint256 _id,
  uint256 _wad
) external view returns (uint256 _boughtCollateral, uint256 _adjustedBid);

Parameters

NameTypeDescription
_iduint256Id of the auction
_waduint256Bid amount [wad]

Returns

NameTypeDescription
_boughtCollateraluint256_collateralBought Amount of collateral that will be bought [wad]
_adjustedBiduint256Adjusted bid amount [wad]

buyCollateral

Buys collateral from an auction

function buyCollateral(
  uint256 _id,
  uint256 _wad
) external whenEnabled returns (uint256 _boughtCollateral, uint256 _adjustedBid);

Parameters

NameTypeDescription
_iduint256Id of the auction
_waduint256Bid amount [wad]

Returns

NameTypeDescription
_boughtCollateraluint256Amount of collateral that was bought [wad]
_adjustedBiduint256Adjusted bid amount [wad]

terminateAuctionPrematurely

Terminates an auction prematurely

Transfers collateral and coins to the authorized caller address

function terminateAuctionPrematurely(uint256 _id) external isAuthorized;

Parameters

NameTypeDescription
_iduint256

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal virtual override;

_setLiquidationEngine

Sets the LiquidationEngine contract address, revoking the previous, and granting the new one authorization

function _setLiquidationEngine(address _newLiquidationEngine) internal virtual;

_setOracleRelayer

Sets the OracleRelayer contract address

function _setOracleRelayer(address _newOracleRelayer) internal virtual;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

DebtAuctionHouse

Git Source

Inherits: Authorizable, Modifiable, Disableable, IDebtAuctionHouse

This contract enables the sell of newly minted protocol tokens in exchange for system coins to cover a protocol debt

State Variables

AUCTION_HOUSE_TYPE

Type of the auction house

bytes32 public constant AUCTION_HOUSE_TYPE = bytes32('DEBT');

_auctions

Unpacked data of an auction

mapping(uint256 _auctionId => Auction) public _auctions;

auctionsStarted

Total amount of debt auctions created

uint256 public auctionsStarted;

activeDebtAuctions

Total amount of simultaneous active debt auctions

uint256 public activeDebtAuctions;

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

protocolToken

Address of the ProtocolToken contract

IProtocolToken public protocolToken;

accountingEngine

Address of the AccountingEngine contract

address public accountingEngine;

_params

Getter for the unpacked contract parameters struct

DebtAuctionHouseParams public _params;

Functions

auctions

Data of an auction

function auctions(uint256 _id) external view returns (Auction memory _auction);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_auctionAuctionAuction data struct

params

Getter for the contract parameters struct

function params() external view returns (DebtAuctionHouseParams memory _dahParams);

Returns

NameTypeDescription
_dahParamsDebtAuctionHouseParamsAuction house parameters struct

constructor

constructor(
  address _safeEngine,
  address _protocolToken,
  DebtAuctionHouseParams memory _dahParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_protocolTokenaddressAddress of the protocol governance token
_dahParamsDebtAuctionHouseParamsInitial valid DebtAuctionHouse parameters struct

_onContractDisable

Internal virtual method to be called when the contract is disabled

Sets the accountingEngine state var to the caller's address

function _onContractDisable() internal override;

startAuction

Start a new debt auction

function startAuction(
  address _incomeReceiver,
  uint256 _amountToSell,
  uint256 _initialBid
) external isAuthorized whenEnabled returns (uint256 _id);

Parameters

NameTypeDescription
_incomeReceiveraddressWho receives the auction proceeds
_amountToSelluint256Initial amount of protocol tokens to be minted [wad]
_initialBiduint256Amount of debt to be sold [rad]

Returns

NameTypeDescription
_iduint256Id of the auction

restartAuction

Restart an auction if no bids were placed

An auction can be restarted if the auction expired with no bids

function restartAuction(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256Id of the auction

decreaseSoldAmount

Decrease the protocol token amount you're willing to receive in exchange for providing the same amount of system coins being raised by the auction

function decreaseSoldAmount(uint256 _id, uint256 _amountToBuy) external whenEnabled;

Parameters

NameTypeDescription
_iduint256ID of the auction for which you want to submit a new bid
_amountToBuyuint256Amount of protocol tokens to buy (must be smaller than the previous proposed amount) [wad]

settleAuction

Settle an auction

Can only be called after the auction expired with a winning bid

function settleAuction(uint256 _id) external whenEnabled;

Parameters

NameTypeDescription
_iduint256Id of the auction

terminateAuctionPrematurely

Terminate an auction prematurely

Can only be called after the contract is disabled

function terminateAuctionPrematurely(uint256 _id) external whenDisabled;

Parameters

NameTypeDescription
_iduint256Id of the auction

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

LiquidationEngine

Git Source

Inherits: Authorizable, Disableable, Modifiable, ModifiablePerCollateral, ReentrancyGuard, ILiquidationEngine

Handles the liquidations of SAFEs if the accumulated debt is higher than the collateral liquidation value

State Variables

safeSaviours

Allowed contracts that can be chosen to save SAFEs from liquidation

mapping(address _saviour => bool _allowed) public safeSaviours;

chosenSAFESaviour

Saviour contract chosen for each SAFE by its owner

mapping(bytes32 _cType => mapping(address _safe => address _saviour)) public chosenSAFESaviour;

currentOnAuctionSystemCoins

Total amount of system coins currently being auctioned

uint256 public currentOnAuctionSystemCoins;

safeEngine

The SAFEEngine is used to query the state of the SAFEs, confiscate the collateral and transfer the debt

ISAFEEngine public safeEngine;

accountingEngine

The AccountingEngine is used to push the debt into the system, and set as the first bidder on the collateral auctions

IAccountingEngine public accountingEngine;

_params

Getter for the unpacked contract parameters struct

LiquidationEngineParams public _params;

_cParams

Getter for the unpacked collateral parameters struct

mapping(bytes32 _cType => LiquidationEngineCollateralParams) public _cParams;

Functions

params

Getter for the contract parameters struct

function params() external view returns (LiquidationEngineParams memory _liqEngineParams);

Returns

NameTypeDescription
_liqEngineParamsLiquidationEngineParamsLiquidationEngine parameters struct

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType) external view returns (LiquidationEngineCollateralParams memory _liqEngineCParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_liqEngineCParamsLiquidationEngineCollateralParamsLiquidationEngine collateral parameters struct

constructor

constructor(
  address _safeEngine,
  address _accountingEngine,
  LiquidationEngineParams memory _liqEngineParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_accountingEngineaddressAddress of the AccountingEngine contract
_liqEngineParamsLiquidationEngineParamsInitial valid LiquidationEngine parameters struct

connectSAFESaviour

Authed function to add contracts that can save SAFEs from liquidation

function connectSAFESaviour(address _saviour) external isAuthorized;

Parameters

NameTypeDescription
_saviouraddressSAFE saviour contract to be whitelisted

disconnectSAFESaviour

Authed function to remove contracts that can save SAFEs from liquidation

function disconnectSAFESaviour(address _saviour) external isAuthorized;

Parameters

NameTypeDescription
_saviouraddressSAFE saviour contract to be removed

protectSAFE

Choose a saviour contract for your SAFE

function protectSAFE(bytes32 _cType, address _safe, address _saviour) external;

Parameters

NameTypeDescription
_cTypebytes32The SAFE's collateral type
_safeaddressThe SAFE's address
_saviouraddressThe chosen saviour

liquidateSAFE

Liquidate a SAFE

A SAFE can be liquidated if the accumulated debt plus the liquidation penalty is higher than the collateral value

function liquidateSAFE(bytes32 _cType, address _safe) external whenEnabled nonReentrant returns (uint256 _auctionId);

Parameters

NameTypeDescription
_cTypebytes32The SAFE's collateral type
_safeaddressThe SAFE's address

Returns

NameTypeDescription
_auctionIduint256The auction id of the collateral auction

attemptSave

function attemptSave(
  bytes32 _cType,
  address _safe,
  address _liquidator,
  ISAFEEngine.SAFE calldata _safeData
) external returns (ISAFEEngine.SAFE memory _newSafeData);

removeCoinsFromAuction

Remove debt that was being auctioned

Usually called by CollateralAuctionHouse when an auction is settled

function removeCoinsFromAuction(uint256 _rad) public isAuthorized;

Parameters

NameTypeDescription
_raduint256The amount of debt in RAD to withdraw from currentOnAuctionSystemCoins

getLimitAdjustedDebtToCover

The limit adjusted debt to cover

function getLimitAdjustedDebtToCover(
  bytes32 _cType,
  address _safe
) external view returns (uint256 _limitAdjustedDebtToCover);

Parameters

NameTypeDescription
_cTypebytes32The SAFE's collateral type
_safeaddressThe SAFE's address

Returns

NameTypeDescription
_limitAdjustedDebtToCoveruint256_wad The limit adjusted debt to cover

_getLimitAdjustedDebt

function _getLimitAdjustedDebt(
  uint256 _generatedDebt,
  uint256 _accumulatedRate,
  uint256 _liquidationQuantity,
  uint256 _liquidationPenalty,
  uint256 _debtFloor
) internal pure returns (uint256 _limitAdjustedDebt);

_initializeCollateralType

Register a new collateral type in the SAFEEngine

function _initializeCollateralType(bytes32 _cType, bytes memory _collateralParams) internal override whenEnabled;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to register
_collateralParamsbytesCollateral parameters

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_modifyParameters

Set a new value for a collateral specific parameter

function _modifyParameters(bytes32 _cType, bytes32 _param, bytes memory _data) internal override;

Parameters

NameTypeDescription
_cTypebytes32String identifier of the collateral to modify
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

_validateCParameters

Internal function to be overriden with custom logic to validate collateral parameters

function _validateCParameters(bytes32 _cType) internal view override;

_setCollateralAuctionHouse

Set the collateral auction house, deny permissions on the old one and approve on the new one

function _setCollateralAuctionHouse(bytes32 _cType, address _newCollateralAuctionHouse) internal;

OracleRelayer

Git Source

Inherits: Authorizable, Disableable, Modifiable, ModifiablePerCollateral, IOracleRelayer

Handles the collateral prices inside the system (SAFEEngine) and calculates the redemption price using the rate

State Variables

safeEngine

The SAFEEngine is called to update the price of the collateral in the system

ISAFEEngine public safeEngine;

systemCoinOracle

The oracle used to fetch the system coin market price

IBaseOracle public systemCoinOracle;

_params

Getter for the unpacked contract parameters struct

OracleRelayerParams public _params;

_cParams

Getter for the unpacked collateral parameters struct

mapping(bytes32 _cType => OracleRelayerCollateralParams) public _cParams;

_redemptionPrice

Virtual redemption price (not the most updated value) [ray]

uint256 internal _redemptionPrice;

redemptionRate

The redemption rate is the rate at which the redemption price changes over time

By changing the redemption rate, it changes the incentives of the system users

uint256 public redemptionRate;

redemptionPriceUpdateTime

Last time when the redemption price was changed

Used to calculate the current redemption price

uint256 public redemptionPriceUpdateTime;

Functions

params

Getter for the contract parameters struct

function params() external view override returns (OracleRelayerParams memory _oracleRelayerParams);

Returns

NameTypeDescription
_oracleRelayerParamsOracleRelayerParamsAn OracleRelayerParams struct

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType) external view returns (OracleRelayerCollateralParams memory _oracleRelayerCParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_oracleRelayerCParamsOracleRelayerCollateralParamsAn OracleRelayerCollateralParams struct

constructor

constructor(
  address _safeEngine,
  IBaseOracle _systemCoinOracle,
  OracleRelayerParams memory _oracleRelayerParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine
_systemCoinOracleIBaseOracleAddress of the system coin oracle
_oracleRelayerParamsOracleRelayerParamsInitial OracleRelayer valid parameters struct

marketPrice

The current system coin market price

function marketPrice() external view returns (uint256 _marketPrice);

Returns

NameTypeDescription
_marketPriceuint256The current system coin market price [ray]

calcRedemptionPrice

View method to fetch the current redemption price

To be used within view functions, not to be used in transactions, use redemptionPrice instead

function calcRedemptionPrice() external view returns (uint256 _virtualRedemptionPrice);

Returns

NameTypeDescription
_virtualRedemptionPriceuint256_redemptionPrice The current calculated redemption price [ray]

_updateRedemptionPrice

Calculates and updates the redemption price using the current redemption rate

function _updateRedemptionPrice() internal virtual returns (uint256 _updatedPrice);

redemptionPrice

Fetch the latest redemption price by first updating it

function redemptionPrice() external returns (uint256 _updatedPrice);

Returns

NameTypeDescription
_updatedPriceuint256The newly updated redemption price [ray]

_getRedemptionPrice

Avoids reupdating the redemptionPrice if no seconds have passed since last update

function _getRedemptionPrice() internal virtual returns (uint256 _updatedPrice);

updateCollateralPrice

Update the collateral price inside the system (inside SAFEEngine)

Usually called by a keeper, incentivized by the system to keep the prices up to date

function updateCollateralPrice(bytes32 _cType) external whenEnabled;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

updateRedemptionRate

Update the system redemption rate, the rate at which the redemption price changes over time

Usually called by the PIDRateSetter

function updateRedemptionRate(uint256 _redemptionRate) external isAuthorized whenEnabled;

Parameters

NameTypeDescription
_redemptionRateuint256The newly calculated redemption rate [ray]

_onContractDisable

Internal virtual method to be called when the contract is disabled

Sets the redemption rate to 1 (no change in the redemption price)

function _onContractDisable() internal override;

_initializeCollateralType

Register a new collateral type in the SAFEEngine

function _initializeCollateralType(bytes32 _cType, bytes memory _collateralParams) internal override;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to register
_collateralParamsbytesCollateral parameters

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override whenEnabled;

_modifyParameters

Set a new value for a collateral specific parameter

function _modifyParameters(bytes32 _cType, bytes32 _param, bytes memory _data) internal override whenEnabled;

Parameters

NameTypeDescription
_cTypebytes32String identifier of the collateral to modify
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

_validateCParameters

Internal function to be overriden with custom logic to validate collateral parameters

function _validateCParameters(bytes32 _cType) internal view override;

PIDController

Git Source

Inherits: Authorizable, Modifiable, IPIDController

Redemption Rate Feedback Mechanism (RRFM) controller that implements a PI controller

State Variables

_NEGATIVE_RATE_LIMIT

The lower (when negative) bound for the redemption rate

Represents a rate of -99.999% per second (as -100% is not allowed) in RAY precision

uint256 internal constant _NEGATIVE_RATE_LIMIT = RAY - 1;

_POSITIVE_RATE_LIMIT

The upper bound for the redemption rate

Maximum possible value that can be safely casted to int256

uint256 internal constant _POSITIVE_RATE_LIMIT = uint256(type(int256).max);

seedProposer

Returns the address allowed to call computeRate method

address public seedProposer;

_params

Getter for the unpacked contract parameters struct

PIDControllerParams public _params;

_deviationObservation

Raw data about the last deviation observation

The last deviation observation, containing latest timestamp, proportional and integral terms

DeviationObservation public _deviationObservation;

_controllerGains

Raw data about the Kp and Ki values used in this calculator

ControllerGains public _controllerGains;

Functions

params

Getter for the contract parameters struct

function params() external view returns (PIDControllerParams memory _pidParams);

Returns

NameTypeDescription
_pidParamsPIDControllerParamsThe PID controller parameters struct

deviationObservation

Returns the last deviation observation, containing latest timestamp, proportional and integral terms

function deviationObservation() external view returns (DeviationObservation memory __deviationObservation);

Returns

NameTypeDescription
__deviationObservationDeviationObservationThe last deviation observation struct

controllerGains

Returns the Kp and Ki values used in this calculator

The values are expressed in WAD, Kp stands for proportional and Ki for integral terms

function controllerGains() external view returns (ControllerGains memory _cGains);

constructor

constructor(
  ControllerGains memory _cGains,
  PIDControllerParams memory _pidParams,
  DeviationObservation memory _importedState
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_cGainsControllerGainsInitial valid controller gains settings struct
_pidParamsPIDControllerParamsInitial valid PID controller parameters struct
_importedStateDeviationObservationImported initial state of the controller (optional)

getBoundedRedemptionRate

Return a redemption rate bounded by feedbackOutputLowerBound and feedbackOutputUpperBound as well as the timeline over which that rate will take effect

function getBoundedRedemptionRate(int256 _piOutput) external view returns (uint256 _newRedemptionRate);

Parameters

NameTypeDescription
_piOutputint256The raw redemption rate computed from the proportional and integral terms

Returns

NameTypeDescription
_newRedemptionRateuint256_redemptionRate The bounded redemption rate

_getBoundedRedemptionRate

Computes the new redemption rate by taking into account the feedbackOutputUpperBound and feedbackOutputLowerBound

function _getBoundedRedemptionRate(int256 _piOutput) internal view virtual returns (uint256 _newRedemptionRate);

_getBoundedPIOutput

Computes the pi output by taking into account the feedbackOutputUpperBound and feedbackOutputLowerBound

function _getBoundedPIOutput(int256 _piOutput) internal view virtual returns (int256 _boundedPIOutput);

computeRate

Compute a new redemption rate

function computeRate(uint256 _marketPrice, uint256 _redemptionPrice) external returns (uint256 _newRedemptionRate);

Parameters

NameTypeDescription
_marketPriceuint256The system coin market price
_redemptionPriceuint256The system coin redemption price

Returns

NameTypeDescription
_newRedemptionRateuint256_redemptionRate The computed redemption rate

_getProportionalTerm

Computes the proportional term using the scaled difference between market price and redemption price

function _getProportionalTerm(
  uint256 _marketPrice,
  uint256 _redemptionPrice
) internal view virtual returns (int256 _proportionalTerm);

breaksNoiseBarrier

Returns whether the P + I sum exceeds the noise barrier

function breaksNoiseBarrier(uint256 _piSum, uint256 _redemptionPrice) external view virtual returns (bool _breaksNb);

Parameters

NameTypeDescription
_piSumuint256Represents a sum between P + I
_redemptionPriceuint256The system coin redemption price

Returns

NameTypeDescription
_breaksNbboolWhether the P + I sum exceeds the noise barrier

_breaksNoiseBarrier

Returns whether the P + I sum exceeds the noise barrier

function _breaksNoiseBarrier(uint256 _piSum, uint256 _redemptionPrice) internal view virtual returns (bool _breaksNb);

getGainAdjustedPIOutput

Apply Kp to the proportional term and Ki to the integral term (by multiplication) and then sum P and I

function getGainAdjustedPIOutput(
  int256 _proportionalTerm,
  int256 _integralTerm
) external view returns (int256 _gainAdjustedPIOutput);

Parameters

NameTypeDescription
_proportionalTermint256The proportional term
_integralTermint256The integral term

Returns

NameTypeDescription
_gainAdjustedPIOutputint256_piOutput The sum of P and I

_getGainAdjustedPIOutput

Computes the gain adjusted PI output by multiplying P by Kp and I by Ki and then sum P & I

function _getGainAdjustedPIOutput(
  int256 _proportionalTerm,
  int256 _integralTerm
) internal view virtual returns (int256 _adjustedPIOutput);

_getGainAdjustedTerms

Computes the gain adjusted terms by multiplying P by Kp and I by Ki

function _getGainAdjustedTerms(
  int256 _proportionalTerm,
  int256 _integralTerm
) internal view virtual returns (int256 _ajustedProportionalTerm, int256 _adjustedIntegralTerm);

getGainAdjustedTerms

Independently return and calculate P * Kp and I * Ki

function getGainAdjustedTerms(
  int256 _proportionalTerm,
  int256 _integralTerm
) external view returns (int256 _ajustedProportionalTerm, int256 _adjustedIntegralTerm);

Parameters

NameTypeDescription
_proportionalTermint256The proportional term
_integralTermint256The integral term

Returns

NameTypeDescription
_ajustedProportionalTermint256_proportionalGain The proportional gain
_adjustedIntegralTermint256_integralGain The integral gain

_updateDeviation

Push new observations in deviationObservations while also updating priceDeviationCumulative

function _updateDeviation(
  int256 _proportionalTerm,
  uint256 _accumulatedLeak
) internal virtual returns (int256 _integralTerm);

Parameters

NameTypeDescription
_proportionalTermint256The proportionalTerm
_accumulatedLeakuint256The total leak (similar to a negative interest rate) applied to priceDeviationCumulative before proportionalTerm is added to it

getNextDeviationCumulative

Compute a new priceDeviationCumulative (integral term)

function getNextDeviationCumulative(
  int256 _proportionalTerm,
  uint256 _accumulatedLeak
) external view returns (int256 _nextDeviationCumulative, int256 _appliedDeviation);

Parameters

NameTypeDescription
_proportionalTermint256The proportional term (redemptionPrice - marketPrice)
_accumulatedLeakuint256The total leak applied to priceDeviationCumulative before it is summed with the new time adjusted deviation

Returns

NameTypeDescription
_nextDeviationCumulativeint256_priceDeviationCumulative The new priceDeviationCumulative
_appliedDeviationint256_timeAdjustedDeviation The new time adjusted deviation

_getNextDeviationCumulative

Computes the new priceDeviationCumulative (integral term)

function _getNextDeviationCumulative(
  int256 _proportionalTerm,
  uint256 _accumulatedLeak
) internal view virtual returns (int256 _nextDeviationCumulative, int256 _appliedDeviation);

getNextRedemptionRate

Compute and return the upcoming redemption rate

This method is used to provide a view of the next redemption rate without updating the state of the controller

function getNextRedemptionRate(
  uint256 _marketPrice,
  uint256 _redemptionPrice,
  uint256 _accumulatedLeak
) external view returns (uint256 _redemptionRate, int256 _proportionalTerm, int256 _integralTerm);

Parameters

NameTypeDescription
_marketPriceuint256The system coin market price
_redemptionPriceuint256The system coin redemption price
_accumulatedLeakuint256The total leak applied to priceDeviationCumulative before it is summed with the proportionalTerm

Returns

NameTypeDescription
_redemptionRateuint256The upcoming redemption rate
_proportionalTermint256The upcoming proportional term
_integralTermint256The upcoming integral term

timeSinceLastUpdate

Returns the time elapsed since the last computeRate call

function timeSinceLastUpdate() external view returns (uint256 _elapsed);

_timeSinceLastUpdate

function _timeSinceLastUpdate() internal view returns (uint256 _elapsed);

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

PIDRateSetter

Git Source

Inherits: Authorizable, Modifiable, IPIDRateSetter

This contract is used to trigger the update of the redemption rate using the PID controller

State Variables

oracleRelayer

The oracle relayer where the redemption price and rate are stored

IOracleRelayer public oracleRelayer;

pidCalculator

The PID calculator used to compute the redemption rate

IPIDController public pidCalculator;

_params

Getter for the unpacked contract parameters struct

PIDRateSetterParams public _params;

lastUpdateTime

The timestamp of the last update

uint256 public lastUpdateTime;

Functions

params

Getter for the contract parameters struct

function params() external view returns (PIDRateSetterParams memory _pidRateSetterParams);

Returns

NameTypeDescription
_pidRateSetterParamsPIDRateSetterParamsPIDRateSetter parameters struct

constructor

constructor(
  address _oracleRelayer,
  address _pidCalculator,
  PIDRateSetterParams memory _pidRateSetterParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_oracleRelayeraddressAddress of the oracle relayer
_pidCalculatoraddressAddress of the PID calculator
_pidRateSetterParamsPIDRateSetterParamsInitial valid PID rate setter parameters struct

updateRate

Compute and set a new redemption rate

function updateRate() external;

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

SAFEEngine

Git Source

Inherits: Authorizable, Disableable, Modifiable, ModifiablePerCollateral, ISAFEEngine

Core contract that manages the state of the SAFE system

State Variables

_params

Getter for the unpacked contract parameters struct

SAFEEngineParams public _params;

_cParams

Getter for the unpacked collateral parameters struct

mapping(bytes32 _cType => SAFEEngineCollateralParams) public _cParams;

_cData

Getter for the unpacked collateral data struct

mapping(bytes32 _cType => SAFEEngineCollateralData) public _cData;

_safes

Unpacked data about each SAFE

mapping(bytes32 _cType => mapping(address _safe => SAFE)) public _safes;

safeRights

Who can transfer collateral & debt in/out of a SAFE

mapping(address _caller => mapping(address _account => bool _isAllowed)) public safeRights;

tokenCollateral

Balance of each collateral type

mapping(bytes32 _cType => mapping(address _safe => uint256 _wad)) public tokenCollateral;

coinBalance

Internal balance of system coins held by an account

mapping(address _safe => uint256 _rad) public coinBalance;

debtBalance

Amount of debt held by an account

mapping(address _safe => uint256 _rad) public debtBalance;

globalDebt

Total amount of debt (coins) currently issued

uint256 public globalDebt;

globalUnbackedDebt

'Bad' debt that's not covered by collateral

uint256 public globalUnbackedDebt;

Functions

params

Getter for the contract parameters struct

function params() external view returns (SAFEEngineParams memory _safeEngineParams);

Returns

NameTypeDescription
_safeEngineParamsSAFEEngineParamsThe active SAFEEngineParams

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType) external view returns (SAFEEngineCollateralParams memory _safeEngineCParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_safeEngineCParamsSAFEEngineCollateralParamsSAFEEngineCollateralParams for the collateral type

cData

Getter for the collateral data struct

function cData(bytes32 _cType) external view returns (SAFEEngineCollateralData memory _safeEngineCData);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_safeEngineCDataSAFEEngineCollateralDataSAFEEngineCollateralData for the collateral type

safes

Data about each SAFE

function safes(bytes32 _cType, address _safe) external view returns (SAFE memory _safeData);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddress

Returns

NameTypeDescription
_safeDataSAFESAFE data for the specified collateral type of the specified safe.

constructor

constructor(SAFEEngineParams memory _safeEngineParams) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineParamsSAFEEngineParamsInitial SAFEEngine valid parameters struct

transferCollateral

Transfer collateral between accounts

function transferCollateral(
  bytes32 _cType,
  address _source,
  address _destination,
  uint256 _wad
) external isSAFEAllowed(_source, msg.sender);

Parameters

NameTypeDescription
_cTypebytes32Collateral type transferred
_sourceaddressCollateral source
_destinationaddressCollateral destination
_waduint256Amount of collateral transferred

transferInternalCoins

Transfer internal coins (does not affect external balances from Coin.sol)

function transferInternalCoins(
  address _source,
  address _destination,
  uint256 _rad
) external isSAFEAllowed(_source, msg.sender);

Parameters

NameTypeDescription
_sourceaddressCoins source
_destinationaddressCoins destination
_raduint256Amount of coins transferred

modifyCollateralBalance

Join/exit collateral into and and out of the system

function modifyCollateralBalance(bytes32 _cType, address _account, int256 _wad) external isAuthorized;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to join/exit
_accountaddressAccount that gets credited/debited
_wadint256Amount of collateral

modifySAFECollateralization

Add/remove collateral or put back/generate more debt in a SAFE

function modifySAFECollateralization(
  bytes32 _cType,
  address _safe,
  address _collateralSource,
  address _debtDestination,
  int256 _deltaCollateral,
  int256 _deltaDebt
) external whenEnabled;

Parameters

NameTypeDescription
_cTypebytes32Type of collateral to withdraw/deposit in and from the SAFE
_safeaddressTarget SAFE
_collateralSourceaddressAccount we take collateral from/put collateral into
_debtDestinationaddressAccount from which we credit/debit coins and debt
_deltaCollateralint256Amount of collateral added/extracted from the SAFE [wad]
_deltaDebtint256Amount of debt to generate/repay [wad]

transferSAFECollateralAndDebt

Transfer collateral and/or debt between SAFEs

function transferSAFECollateralAndDebt(
  bytes32 _cType,
  address _src,
  address _dst,
  int256 _deltaCollateral,
  int256 _deltaDebt
) external isSAFEAllowed(_src, msg.sender) isSAFEAllowed(_dst, msg.sender);

Parameters

NameTypeDescription
_cTypebytes32Collateral type transferred between SAFEs
_srcaddressSource SAFE
_dstaddressDestination SAFE
_deltaCollateralint256Amount of collateral to take/add into src and give/take from dst [wad]
_deltaDebtint256Amount of debt to take/add into src and give/take from dst [wad]

confiscateSAFECollateralAndDebt

Normally used by the LiquidationEngine in order to confiscate collateral and debt from a SAFE and give them to someone else

function confiscateSAFECollateralAndDebt(
  bytes32 _cType,
  address _safe,
  address _collateralSource,
  address _debtDestination,
  int256 _deltaCollateral,
  int256 _deltaDebt
) external isAuthorized;

Parameters

NameTypeDescription
_cTypebytes32Collateral type the SAFE has locked inside
_safeaddressTarget SAFE
_collateralSourceaddressWho we take/give collateral to
_debtDestinationaddressWho we take/give debt to
_deltaCollateralint256Amount of collateral taken/added into the SAFE [wad]
_deltaDebtint256Amount of debt taken/added into the SAFE [wad]

settleDebt

Nullify an amount of coins with an equal amount of debt

Coins & debt are like matter and antimatter, they nullify each other

function settleDebt(uint256 _rad) external;

Parameters

NameTypeDescription
_raduint256Amount of debt & coins to destroy

createUnbackedDebt

Allows an authorized contract to create debt without collateral

Usually called by DebtAuctionHouse in order to terminate auctions prematurely post settlement

function createUnbackedDebt(address _debtDestination, address _coinDestination, uint256 _rad) external isAuthorized;

Parameters

NameTypeDescription
_debtDestinationaddressThe account that will receive the newly created debt
_coinDestinationaddressThe account that will receive the newly created coins
_raduint256Amount of debt to create

updateAccumulatedRate

Allows an authorized contract to accrue interest on a specific collateral type

The rateMultiplier is usually calculated by the TaxCollector contract

function updateAccumulatedRate(
  bytes32 _cType,
  address _surplusDst,
  int256 _rateMultiplier
) external isAuthorized whenEnabled;

Parameters

NameTypeDescription
_cTypebytes32Collateral type we accrue interest for
_surplusDstaddressDestination for the newly created surplus
_rateMultiplierint256Multiplier applied to the debtAmount in order to calculate the surplus [ray]

updateCollateralPrice

Allows an authorized contract to update the safety price and liquidation price of a collateral type

function updateCollateralPrice(
  bytes32 _cType,
  uint256 _safetyPrice,
  uint256 _liquidationPrice
) external isAuthorized whenEnabled;

Parameters

NameTypeDescription
_cTypebytes32Collateral type we update the prices for
_safetyPriceuint256New safety price [ray]
_liquidationPriceuint256New liquidation price [ray]

addAuthorization

Add auth to an account

This overriden method avoids adding new authorizations after the contract has been disabled

function addAuthorization(address _account) external override(Authorizable, IAuthorizable) isAuthorized whenEnabled;

Parameters

NameTypeDescription
_accountaddressAccount to add auth to

removeAuthorization

Remove auth from an account

function removeAuthorization(address _account) external override(Authorizable, IAuthorizable) isAuthorized whenEnabled;

Parameters

NameTypeDescription
_accountaddressAccount to remove auth from

approveSAFEModification

Allow an address to modify your SAFE

function approveSAFEModification(address _account) external;

Parameters

NameTypeDescription
_accountaddressAccount to give SAFE permissions to

denySAFEModification

Deny an address the rights to modify your SAFE

function denySAFEModification(address _account) external;

Parameters

NameTypeDescription
_accountaddressAccount that is denied SAFE permissions

canModifySAFE

Checks whether an account has the right to modify a SAFE

function canModifySAFE(address _safe, address _account) public view returns (bool _canModifySafe);

Parameters

NameTypeDescription
_safeaddressThe safe to check
_accountaddressThe account to check

Returns

NameTypeDescription
_canModifySafebool_allowed Whether the account can modify the safe

_modifyCollateralBalance

function _modifyCollateralBalance(bytes32 _cType, address _account, int256 _wad) internal;

_modifyInternalCoins

function _modifyInternalCoins(address _dst, int256 _rad) internal;

_modifySAFECollateralization

function _modifySAFECollateralization(
  bytes32 _cType,
  address _safe,
  int256 _deltaCollateral,
  int256 _deltaDebt
) internal;

_emitTransferCollateral

function _emitTransferCollateral(bytes32 _cType, address _src, address _dst, int256 _deltaCollateral) internal;

_initializeCollateralType

Register a new collateral type in the SAFEEngine

function _initializeCollateralType(bytes32 _cType, bytes memory _collateralParams) internal override whenEnabled;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to register
_collateralParamsbytesCollateral parameters

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_modifyParameters

Set a new value for a collateral specific parameter

function _modifyParameters(bytes32 _cType, bytes32 _param, bytes memory _data) internal override;

Parameters

NameTypeDescription
_cTypebytes32String identifier of the collateral to modify
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

isSAFEAllowed

modifier isSAFEAllowed(address _safe, address _account);

StabilityFeeTreasury

Git Source

Inherits: Authorizable, Modifiable, Disableable, IStabilityFeeTreasury

This contract is in charge of distributing the accrued stability fees to allowed addresses

State Variables

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

systemCoin

Address of the SystemCoin contract

ISystemCoin public systemCoin;

coinJoin

Address of the CoinJoin contract

ICoinJoin public coinJoin;

extraSurplusReceiver

Address that receives surplus funds when treasury exceeds capacity (or is disabled)

address public extraSurplusReceiver;

_params

Getter for the unpacked contract parameters struct

StabilityFeeTreasuryParams public _params;

_allowance

Getter for the unpacked allowance struct of a given account

A null per hour allowance means that the account has no per hour limit

mapping(address _account => Allowance) public _allowance;

pulledPerHour

Amount of internal coins a given account has pulled from the treasury in a given block hour

mapping(address _account => mapping(uint256 _blockHour => uint256 _rad)) public pulledPerHour;

latestSurplusTransferTime

Timestamp of the last time that surplus funds were transferred

uint256 public latestSurplusTransferTime;

Functions

params

Getter for the contract parameters struct

function params() external view returns (StabilityFeeTreasuryParams memory _sfTreasuryParams);

Returns

NameTypeDescription
_sfTreasuryParamsStabilityFeeTreasuryParamsStabilityFee parameters struct

allowance

Getter for the allowance struct of a given account

function allowance(address _account) external view returns (Allowance memory __allowance);

Parameters

NameTypeDescription
_accountaddressThe account to query

Returns

NameTypeDescription
__allowanceAllowanceData structure containing total and per hour allowance for the given account

accountNotTreasury

Modifier to check if an account is not the treasury (this contract)

This modifier is used to prevent the treasury from giving funds to itself

modifier accountNotTreasury(address _account);

Parameters

NameTypeDescription
_accountaddressThe account to check whether it's the treasury or not

constructor

constructor(
  address _safeEngine,
  address _extraSurplusReceiver,
  address _coinJoin,
  StabilityFeeTreasuryParams memory _sfTreasuryParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_extraSurplusReceiveraddressAddress that receives surplus funds when treasury exceeds capacity
_coinJoinaddressAddress of the CoinJoin contract
_sfTreasuryParamsStabilityFeeTreasuryParamsInitial valid StabilityFeeTreasury parameters struct

_onContractDisable

Disable this contract (normally called by GlobalSettlement)

This method is virtual and should be overriden to implement

function _onContractDisable() internal override;

_joinAllCoins

Join all ERC20 system coins that the treasury has inside the SAFEEngine

Converts all ERC20 system coins to internal system coins

function _joinAllCoins() internal;

settleDebt

Settle as much bad debt as possible (if this contract has any)

function settleDebt() external returns (uint256 _coinBalance, uint256 _debtBalance);

Returns

NameTypeDescription
_coinBalanceuint256Amount of internal system coins that this contract has after settling debt
_debtBalanceuint256Amount of bad debt that this contract has after settling debt

_settleDebt

Settle as much bad debt as possible (if this contract has any)

function _settleDebt() internal returns (uint256 _coinBalance, uint256 _debtBalance);

Returns

NameTypeDescription
_coinBalanceuint256Amount of internal system coins that this contract has after settling debt
_debtBalanceuint256Amount of bad debt that this contract has after settling debt

setTotalAllowance

Modify an address' total allowance in order to withdraw SF from the treasury

function setTotalAllowance(address _account, uint256 _rad) external isAuthorized accountNotTreasury(_account);

Parameters

NameTypeDescription
_accountaddressThe approved address
_raduint256The total approved amount of SF to withdraw [rad]

setPerHourAllowance

Modify an address' per hour allowance in order to withdraw SF from the treasury

function setPerHourAllowance(address _account, uint256 _rad) external isAuthorized accountNotTreasury(_account);

Parameters

NameTypeDescription
_accountaddressThe approved address
_raduint256The per hour approved amount of SF to withdraw [rad]

giveFunds

Governance transfers SF to an address

function giveFunds(address _account, uint256 _rad) external isAuthorized accountNotTreasury(_account);

Parameters

NameTypeDescription
_accountaddressAddress to transfer SF to
_raduint256Amount of internal system coins to transfer [rad]

takeFunds

Governance takes funds from an address

function takeFunds(address _account, uint256 _rad) external isAuthorized accountNotTreasury(_account);

Parameters

NameTypeDescription
_accountaddressAddress to take system coins from
_raduint256Amount of internal system coins to take from the account [rad]

pullFunds

Pull stability fees from the treasury

The caller of this method needs to have enough allowance in order to pull funds

function pullFunds(address _dstAccount, uint256 _wad) external;

Parameters

NameTypeDescription
_dstAccountaddressAddress to transfer funds to
_waduint256Amount of system coins (SF) to transfer [wad]

transferSurplusFunds

Transfer surplus stability fees to the extraSurplusReceiver. This is here to make sure that the treasury doesn't accumulate fees that it doesn't even need in order to pay for allowances. It ensures that there are enough funds left in the treasury to account for posterior expenses

function transferSurplusFunds() external;

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

SurplusAuctionHouse

Git Source

Inherits: Authorizable, Modifiable, Disableable, ISurplusAuctionHouse

This contract enables the sell of system coins in exchange for protocol tokens

A percentage of the protocol tokens raised in the auction are sent to a receiver, the rest is burnt

State Variables

AUCTION_HOUSE_TYPE

Type of the auction house

bytes32 public constant AUCTION_HOUSE_TYPE = bytes32('SURPLUS');

_auctions

Raw data of an auction

mapping(uint256 _auctionId => Auction) public _auctions;

auctionsStarted

Total amount of surplus auctions created

uint256 public auctionsStarted;

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

protocolToken

Address of the ProtocolToken contract

IProtocolToken public protocolToken;

_params

Getter for the unpacked contract parameters struct

SurplusAuctionHouseParams public _params;

Functions

auctions

Data of an auction

function auctions(uint256 _id) external view returns (Auction memory _auction);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_auctionAuctionAuction data struct

params

Getter for the contract parameters struct

function params() external view returns (SurplusAuctionHouseParams memory _sahParams);

Returns

NameTypeDescription
_sahParamsSurplusAuctionHouseParamsAuction house parameters struct

constructor

constructor(
  address _safeEngine,
  address _protocolToken,
  SurplusAuctionHouseParams memory _sahParams
) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_protocolTokenaddressAddress of the protocol governance token
_sahParamsSurplusAuctionHouseParamsInitial valid SurplusAuctionHouse parameters struct

_onContractDisable

Internal virtual method to be called when the contract is disabled

Transfer all system coins back to the caller's address (usually the AccountingEngine)

function _onContractDisable() internal override;

startAuction

Start a new surplus auction

function startAuction(
  uint256 _amountToSell,
  uint256 _initialBid
) external isAuthorized whenEnabled returns (uint256 _id);

Parameters

NameTypeDescription
_amountToSelluint256Total amount of system coins to sell [rad]
_initialBiduint256Initial protocol token bid [wad]

Returns

NameTypeDescription
_iduint256ID of the started auction

restartAuction

Restart an auction if no bids were submitted for it

function restartAuction(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256ID of the auction to restart

increaseBidSize

Submit a higher protocol token bid for the same amount of system coins

function increaseBidSize(uint256 _id, uint256 _bid) external whenEnabled;

Parameters

NameTypeDescription
_iduint256ID of the auction you want to submit the bid for
_biduint256New bid submitted [wad]

settleAuction

Settle/finish an auction

function settleAuction(uint256 _id) external whenEnabled;

Parameters

NameTypeDescription
_iduint256ID of the auction to settle

terminateAuctionPrematurely

Terminate an auction prematurely.

function terminateAuctionPrematurely(uint256 _id) external whenDisabled;

Parameters

NameTypeDescription
_iduint256ID of the auction to settle/terminate

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

TaxCollector

Git Source

Inherits: Authorizable, Modifiable, ModifiablePerCollateral, ITaxCollector

This contract calculates and collects the stability fee from all collateral types

State Variables

safeEngine

Address of the SAFEEngine contract

ISAFEEngine public safeEngine;

_params

Getter for the unpacked contract parameters struct

TaxCollectorParams public _params;

_cParams

Getter for the unpacked collateral parameters struct

mapping(bytes32 _cType => TaxCollectorCollateralParams) public _cParams;

_cData

Getter for the unpacked collateral data struct

mapping(bytes32 _cType => TaxCollectorCollateralData) public _cData;

_secondaryReceiverRevenueSources

List of collateral types that send SF to a specific tax receiver

mapping(address _taxReceiver => EnumerableSet.Bytes32Set) internal _secondaryReceiverRevenueSources;

_secondaryTaxReceivers

Getter for the unpacked data about a specific secondary tax receiver

mapping(bytes32 _cType => mapping(address _taxReceiver => TaxReceiver)) public _secondaryTaxReceivers;

_secondaryReceivers

Enumerable set with the active secondary tax receivers

EnumerableSet.AddressSet internal _secondaryReceivers;

Functions

params

Getter for the contract parameters struct

function params() external view returns (TaxCollectorParams memory _taxCollectorParams);

Returns

NameTypeDescription
_taxCollectorParamsTaxCollectorParamsTax collector parameters struct

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType) external view returns (TaxCollectorCollateralParams memory _taxCollectorCParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_taxCollectorCParamsTaxCollectorCollateralParamsTax collector collateral parameters struct

cData

Getter for the collateral data struct

function cData(bytes32 _cType) external view returns (TaxCollectorCollateralData memory _taxCollectorCData);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_taxCollectorCDataTaxCollectorCollateralDataTax collector collateral data struct

secondaryTaxReceivers

Getter for the data about a specific secondary tax receiver

function secondaryTaxReceivers(
  bytes32 _cType,
  address _receiver
) external view returns (TaxReceiver memory _secondaryTaxReceiver);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_receiveraddressTax receiver address to check

Returns

NameTypeDescription
_secondaryTaxReceiverTaxReceiverTax receiver struct

constructor

constructor(address _safeEngine, TaxCollectorParams memory _taxCollectorParams) Authorizable(msg.sender) validParams;

Parameters

NameTypeDescription
_safeEngineaddressAddress of the SAFEEngine contract
_taxCollectorParamsTaxCollectorParamsInitial valid TaxCollector parameters struct

collectedManyTax

Check if multiple collateral types are up to date with taxation

function collectedManyTax(uint256 _start, uint256 _end) public view returns (bool _ok);

Parameters

NameTypeDescription
_startuint256Index of the first collateral type to check
_enduint256Index of the last collateral type to check

Returns

NameTypeDescription
_okboolWhether all collateral types are up to date

taxManyOutcome

Check how much SF will be charged (to collateral types between indexes 'start' and 'end' in the collateralList) during the next taxation

function taxManyOutcome(uint256 _start, uint256 _end) public view returns (bool _ok, int256 _rad);

Parameters

NameTypeDescription
_startuint256Index in collateralList from which to start looping and calculating the tax outcome
_enduint256Index in collateralList at which we stop looping and calculating the tax outcome

Returns

NameTypeDescription
_okboolWhether the tax outcome can be computed
_radint256The total amount of SF that will be charged during the next taxation

taxSingleOutcome

Get how much SF will be distributed after taxing a specific collateral type

function taxSingleOutcome(bytes32 _cType) public view returns (uint256 _newlyAccumulatedRate, int256 _deltaRate);

Parameters

NameTypeDescription
_cTypebytes32Collateral type to compute the taxation outcome for

Returns

NameTypeDescription
_newlyAccumulatedRateuint256The newly accumulated rate
_deltaRateint256The delta between the new and the last accumulated rates

secondaryReceiversListLength

Get the secondary tax receiver list length

function secondaryReceiversListLength() public view returns (uint256 _secondaryReceiversListLength);

collateralListLength

Get the collateralList length

function collateralListLength() public view returns (uint256 _collateralListLength);

isSecondaryReceiver

Check if a tax receiver is at a certain position in the list

function isSecondaryReceiver(address _receiver) public view returns (bool _isSecondaryReceiver);

Parameters

NameTypeDescription
_receiveraddressTax receiver address to check

Returns

NameTypeDescription
_isSecondaryReceiverboolWhether the tax receiver for at least one collateral type

secondaryReceiversList

Get the list of all secondary tax receivers

function secondaryReceiversList() external view returns (address[] memory _secondaryReceiversList);

secondaryReceiverRevenueSourcesList

Get the list of all collateral types for which a specific address is a secondary tax receiver

function secondaryReceiverRevenueSourcesList(address _secondaryReceiver)
  external
  view
  returns (bytes32[] memory _secondaryReceiverRevenueSourcesList);

Parameters

NameTypeDescription
_secondaryReceiveraddressSecondary tax receiver address to check

Returns

NameTypeDescription
_secondaryReceiverRevenueSourcesListbytes32[]List of collateral types for which the address is a secondary tax receiver

taxMany

Collect tax from multiple collateral types at once

function taxMany(uint256 _start, uint256 _end) external;

Parameters

NameTypeDescription
_startuint256Index in collateralList from which to start looping and calculating the tax outcome
_enduint256Index in collateralList at which we stop looping and calculating the tax outcome

taxSingle

Collect tax from a single collateral type

function taxSingle(bytes32 _cType) public returns (uint256 _latestAccumulatedRate);

Parameters

NameTypeDescription
_cTypebytes32Collateral type to tax

Returns

NameTypeDescription
_latestAccumulatedRateuint256The newly accumulated rate after taxation

_getNextStabilityFee

Compute the next stability fee for a collateral type, bounded by the maxStabilityFeeRange

The stability fee calculation is bounded by the maxStabilityFeeRange

function _getNextStabilityFee(bytes32 _cType) internal view returns (uint256 _nextStabilityFee);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 identifier of the collateral type

Returns

NameTypeDescription
_nextStabilityFeeuint256The next stability fee to be applied for the collateral type

_splitTaxIncome

Split SF between all tax receivers

function _splitTaxIncome(bytes32 _cType, uint256 _debtAmount, int256 _deltaRate) internal;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to distribute SF for
_debtAmountuint256Total debt currently issued for the collateral type
_deltaRateint256Difference between the last and the latest accumulate rates for the collateralType

_distributeTax

Give/withdraw SF from a tax receiver

function _distributeTax(bytes32 _cType, address _receiver, uint256 _debtAmount, int256 _deltaRate) internal;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to distribute SF for
_receiveraddressTax receiver address
_debtAmountuint256Total debt currently issued
_deltaRateint256Difference between the latest and the last accumulated rates for the collateralType

_initializeCollateralType

If SF is negative and a tax receiver doesn't have enough coins to absorb the loss, compute a new tax cut that can be absorbed If the tax receiver's tax cut is not null and if the receiver accepts negative SF offer/take SF to/from them

function _initializeCollateralType(bytes32 _cType, bytes memory _collateralParams) internal override;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to register
_collateralParamsbytesCollateral parameters

_modifyParameters

Internal function to be overriden with custom logic to modify parameters

This function is set to revert if not overriden

function _modifyParameters(bytes32 _param, bytes memory _data) internal override;

_modifyParameters

Set a new value for a collateral specific parameter

function _modifyParameters(bytes32 _cType, bytes32 _param, bytes memory _data) internal override;

Parameters

NameTypeDescription
_cTypebytes32String identifier of the collateral to modify
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

_validateParameters

Internal function to be overriden with custom logic to validate parameters

function _validateParameters() internal view override;

_validateCParameters

Internal function to be overriden with custom logic to validate collateral parameters

function _validateCParameters(bytes32 _cType) internal view override;

_setPrimaryTaxReceiver

Sets the primary tax receiver, the address that receives the unallocated SF from all collateral types

function _setPrimaryTaxReceiver(address _primaryTaxReceiver) internal;

Parameters

NameTypeDescription
_primaryTaxReceiveraddressAddress of the primary tax receiver

_setSecondaryTaxReceiver

Add a new secondary tax receiver or update data (add a new SF source or modify % of SF taken from a collateral type)

function _setSecondaryTaxReceiver(bytes32 _cType, TaxReceiver memory _data) internal;

Parameters

NameTypeDescription
_cTypebytes32Collateral type that will give SF to the tax receiver
_dataTaxReceiverEncoded data containing the receiver, tax percentage, and whether it supports negative tax

Contents

Contents

IBeefyVaultV7

Git Source

Functions

getPricePerFullShare

function getPricePerFullShare() external view returns (uint256 _pricePerFullShare);

symbol

function symbol() external view returns (string memory _symbol);

ISAFESaviour

Git Source

Functions

saveSAFE

function saveSAFE(
  address _liquidator,
  bytes32 _cType,
  address _safe
) external returns (bool _ok, uint256 _collateralAdded, uint256 _liquidatorReward);

IVeloPool

Git Source

Functions

totalSupply

Returns the value of tokens in existence.

function totalSupply() external view returns (uint256 _totalSupply);

reserve0

Amount of token0 in pool

function reserve0() external view returns (uint256 _reserve0);

reserve1

Amount of token1 in pool

function reserve1() external view returns (uint256 _reserve1);

symbol

function symbol() external view returns (string memory _symbol);

IWeth

Git Source

Inherits: IERC20

Functions

deposit

function deposit() external payable;

withdraw

function withdraw(uint256 _amount) external;

Contents

IAuthorizableChild

Git Source

Inherits: IAuthorizable, IFactoryChild

IBeefyVeloVaultRelayerChild

Git Source

Inherits: IBeefyVeloVaultRelayer, IFactoryChild

IBeefyVeloVaultRelayerFactory

Git Source

Inherits: IAuthorizable

Functions

deployBeefyVeloVaultRelayer

Deploys a new BeefyVeloVaultRelayer contract

function deployBeefyVeloVaultRelayer(
  IBaseOracle _token0priceSource,
  IBaseOracle _token1priceSource,
  IBeefyVaultV7 _beefyVault,
  IVeloPool _veloPool
) external returns (IBaseOracle _beefyVeloVaultRelayer);

Parameters

NameTypeDescription
_token0priceSourceIBaseOracleAddress of the price source for the first token in the velo pool
_token1priceSourceIBaseOracleAddress of the price source for the second token in the velo pool
_beefyVaultIBeefyVaultV7The address of the beefy vault contract
_veloPoolIVeloPoolThe address of the velo pool underlying the beefy vault

Returns

NameTypeDescription
_beefyVeloVaultRelayerIBaseOracleAddress of the deployed BeefyVeloVaultRelayer contract

beefyVeloVaultRelayersList

Getter for the list of BeefyVeloVaultRelayer contracts

function beefyVeloVaultRelayersList() external view returns (address[] memory _beefyVeloVaultRelayersList);

Returns

NameTypeDescription
_beefyVeloVaultRelayersListaddress[]List of BeefyVeloVaultRelayer contracts

Events

NewBeefyVeloVaultRelayer

Emitted when a new BeefyVeloVaultRelayer contract is deployed

event NewBeefyVeloVaultRelayer(
  address indexed _beefyVeloVaultRelayer,
  address _token0priceSource,
  address _token1priceSource,
  address _beefyVault,
  address _veloPool
);

Parameters

NameTypeDescription
_beefyVeloVaultRelayeraddressAddress of the deployed DenominatedOracle contract
_token0priceSourceaddressAddress of the price source for the first token in the velo pool
_token1priceSourceaddressAddress of the price source for the second token in the velo pool
_beefyVaultaddressThe address of the beefy vault contract
_veloPooladdressThe address of the velo pool underlying the beefy vault

IChainlinkRelayerChild

Git Source

Inherits: IChainlinkRelayer, IFactoryChild

IChainlinkRelayerFactory

Git Source

Inherits: IAuthorizable

Functions

sequencerUptimeFeed

Address of the Chainlink sequencer uptime feed used to consult the sequencer status

function sequencerUptimeFeed() external view returns (IChainlinkOracle _sequencerUptimeFeed);

deployChainlinkRelayer

Deploys a new ChainlinkRelayer contract

function deployChainlinkRelayer(
  address _priceFeed,
  uint256 _staleThreshold
) external returns (IBaseOracle _chainlinkRelayer);

Parameters

NameTypeDescription
_priceFeedaddressAddress of the price feed to be used by the ChainlinkRelayer contract
_staleThresholduint256Stale threshold to be used by the ChainlinkRelayer contract

Returns

NameTypeDescription
_chainlinkRelayerIBaseOracleAddress of the deployed ChainlinkRelayer contract

chainlinkRelayersList

Getter for the list of ChainlinkRelayer contracts

function chainlinkRelayersList() external view returns (address[] memory _chainlinkRelayersList);

Returns

NameTypeDescription
_chainlinkRelayersListaddress[]List of ChainlinkRelayer contracts

setSequencerUptimeFeed

Sets the Chainlink sequencer uptime feed contract address

function setSequencerUptimeFeed(address _sequencerUptimeFeed) external;

Parameters

NameTypeDescription
_sequencerUptimeFeedaddressThe address of the Chainlink sequencer uptime feed

Events

NewChainlinkRelayer

Emitted when a new ChainlinkRelayer contract is deployed

event NewChainlinkRelayer(
  address indexed _chainlinkRelayer, address _priceFeed, address _sequencerUptimeFeed, uint256 _staleThreshold
);

Parameters

NameTypeDescription
_chainlinkRelayeraddressAddress of the deployed ChainlinkRelayer contract
_priceFeedaddressAddress of the price feed to be used by the ChainlinkRelayer contract
_sequencerUptimeFeedaddressAddress of the sequencer uptime feed to be used by the ChainlinkRelayer contract
_staleThresholduint256Stale threshold to be used by the ChainlinkRelayer contract

Errors

ChainlinkRelayerFactory_NullSequencerUptimeFeed

Throws if the provided sequencer uptime feed address is null

error ChainlinkRelayerFactory_NullSequencerUptimeFeed();

ICollateralAuctionHouseChild

Git Source

Inherits: ICollateralAuctionHouse, IFactoryChild

ICollateralAuctionHouseFactory

Git Source

Inherits: IAuthorizable, IModifiable, IModifiablePerCollateral

Functions

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType)
  external
  view
  returns (ICollateralAuctionHouse.CollateralAuctionHouseParams memory _cahParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_cahParamsICollateralAuctionHouse.CollateralAuctionHouseParamsCollateralAuctionHouse parameters struct

_cParams

Getter for the unpacked collateral parameters struct

function _cParams(bytes32 _cType)
  external
  view
  returns (uint256 _minimumBid, uint256 _minDiscount, uint256 _maxDiscount, uint256 _perSecondDiscountUpdateRate);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_minimumBiduint256Minimum bid for the collateral auctions [wad]
_minDiscountuint256Minimum discount for the collateral auctions [wad %]
_maxDiscountuint256Maximum discount for the collateral auctions [wad %]
_perSecondDiscountUpdateRateuint256Per second rate at which the discount is updated [ray]

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (address _safeEngine);

liquidationEngine

Address of the LiquidationEngine contract

function liquidationEngine() external view returns (address _liquidationEngine);

oracleRelayer

Address of the OracleRelayer contract

function oracleRelayer() external view returns (address _oracleRelayer);

collateralAuctionHouses

Getter for the address of the CollateralAuctionHouse contract associated with a collateral type

function collateralAuctionHouses(bytes32 _cType) external view returns (address _collateralAuctionHouse);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_collateralAuctionHouseaddressAddress of the CollateralAuctionHouse contract

collateralAuctionHousesList

Getter for the list of CollateralAuctionHouse contracts

function collateralAuctionHousesList() external view returns (address[] memory _collateralAuctionHouses);

Returns

NameTypeDescription
_collateralAuctionHousesaddress[]List of CollateralAuctionHouse contracts

Events

DeployCollateralAuctionHouse

Emitted when a new CollateralAuctionHouse contract is deployed

event DeployCollateralAuctionHouse(bytes32 indexed _cType, address indexed _collateralAuctionHouse);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_collateralAuctionHouseaddressAddress of the deployed CollateralAuctionHouse contract

ICollateralJoinChild

Git Source

Inherits: ICollateralJoin, IFactoryChild

ICollateralJoinDelegatableChild

Git Source

Inherits: ICollateralJoinChild

Functions

delegatee

Address to whom the votes are delegated

function delegatee() external view returns (address _delegatee);

ICollateralJoinFactory

Git Source

Inherits: IAuthorizable, IDisableable

Functions

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (address _safeEngine);

collateralJoins

Getter for the address of the CollateralJoin contract associated with a collateral type

function collateralJoins(bytes32 _cType) external view returns (address _collateralJoin);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_collateralJoinaddressAddress of the CollateralJoin contract

collateralTypesList

Getter for the list of collateral types

function collateralTypesList() external view returns (bytes32[] memory _collateralTypesList);

Returns

NameTypeDescription
_collateralTypesListbytes32[]List of collateral types

collateralJoinsList

Getter for the list of CollateralJoin contracts

function collateralJoinsList() external view returns (address[] memory _collateralJoinsList);

Returns

NameTypeDescription
_collateralJoinsListaddress[]List of CollateralJoin contracts

deployCollateralJoin

Deploys a CollateralJoinChild contract

function deployCollateralJoin(bytes32 _cType, address _collateral) external returns (ICollateralJoin _collateralJoin);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_collateraladdressAddress of the ERC20 collateral token

Returns

NameTypeDescription
_collateralJoinICollateralJoinAddress of the deployed CollateralJoinChild contract

deployDelegatableCollateralJoin

Deploys a CollateralJoinDelegatableChild contract

function deployDelegatableCollateralJoin(
  bytes32 _cType,
  address _collateral,
  address _delegatee
) external returns (ICollateralJoin _collateralJoin);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_collateraladdressAddress of the ERC20Votes collateral token
_delegateeaddressAddress to whom the deployed child will delegate the voting power to

Returns

NameTypeDescription
_collateralJoinICollateralJoinAddress of the deployed CollateralJoinDelegatableChild contract

disableCollateralJoin

Disables a CollateralJoin contract and removes it from the collateral types list

Allows the deployment of other CollateralJoin contract for the same collateral type

function disableCollateralJoin(bytes32 _cType) external;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Events

DeployCollateralJoin

Emitted when a new CollateralJoin contract is deployed

event DeployCollateralJoin(bytes32 indexed _cType, address indexed _collateral, address indexed _collateralJoin);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_collateraladdressAddress of the ERC20 collateral token
_collateralJoinaddressAddress of the deployed CollateralJoin contract

DisableCollateralJoin

Emitted when a CollateralJoin contract is disabled

event DisableCollateralJoin(address indexed _collateralJoin);

Parameters

NameTypeDescription
_collateralJoinaddressAddress of the disabled CollateralJoin contract

Errors

CollateralJoinFactory_CollateralJoinExistent

Throws when trying to deploy a CollateralJoin contract for an existent collateral type

error CollateralJoinFactory_CollateralJoinExistent();

CollateralJoinFactory_CollateralJoinNonExistent

Throws when trying to disable a non-existent CollateralJoin contract

error CollateralJoinFactory_CollateralJoinNonExistent();

IDelayedOracleChild

Git Source

Inherits: IDelayedOracle, IFactoryChild

IDelayedOracleFactory

Git Source

Inherits: IAuthorizable

Functions

deployDelayedOracle

Deploys a new DelayedOracle contract

function deployDelayedOracle(
  IBaseOracle _priceSource,
  uint256 _updateDelay
) external returns (IDelayedOracle _delayedOracle);

Parameters

NameTypeDescription
_priceSourceIBaseOracleAddress of the price source for the DelayedOracle contract
_updateDelayuint256Delay in seconds to be applied between the price source and the delayed oracle feeds

Returns

NameTypeDescription
_delayedOracleIDelayedOracleAddress of the deployed DelayedOracle contract

delayedOraclesList

Getter for the list of DelayedOracle contracts

function delayedOraclesList() external view returns (address[] memory _delayedOraclesList);

Returns

NameTypeDescription
_delayedOraclesListaddress[]List of DelayedOracle contracts

Events

NewDelayedOracle

Emitted when a new DelayedOracle contract is deployed

event NewDelayedOracle(address indexed _delayedOracle, address _priceSource, uint256 _updateDelay);

Parameters

NameTypeDescription
_delayedOracleaddressAddress of the deployed DelayedOracle contract
_priceSourceaddressAddress of the price source for the DelayedOracle contract
_updateDelayuint256Delay in seconds to be applied between the price source and the delayed oracle feeds

IDenominatedOracleChild

Git Source

Inherits: IDenominatedOracle, IFactoryChild

IDenominatedOracleFactory

Git Source

Inherits: IAuthorizable

Functions

deployDenominatedOracle

Deploys a new DenominatedOracle contract

The denomination quote should follow the format: (A / B) * (B / C) = A / C

If the quote is inverted, the format should be read as: (B / A)^-1 * (B / C) = A / C

function deployDenominatedOracle(
  IBaseOracle _priceSource,
  IBaseOracle _denominationPriceSource,
  bool _inverted
) external returns (IBaseOracle _denominatedOracle);

Parameters

NameTypeDescription
_priceSourceIBaseOracleAddress of the price source for the DenominatedOracle contract
_denominationPriceSourceIBaseOracleAddress of the denomination price source for the DenominatedOracle contract
_invertedboolBoolean indicating if the denomination calculation quote should be inverted

Returns

NameTypeDescription
_denominatedOracleIBaseOracleAddress of the deployed DenominatedOracle contract

denominatedOraclesList

Getter for the list of DenominatedOracle contracts

function denominatedOraclesList() external view returns (address[] memory _denominatedOraclesList);

Returns

NameTypeDescription
_denominatedOraclesListaddress[]List of DenominatedOracle contracts

Events

NewDenominatedOracle

Emitted when a new DenominatedOracle contract is deployed

event NewDenominatedOracle(
  address indexed _denominatedOracle, address _priceSource, address _denominationPriceSource, bool _inverted
);

Parameters

NameTypeDescription
_denominatedOracleaddressAddress of the deployed DenominatedOracle contract
_priceSourceaddressAddress of the price source for the DenominatedOracle contract
_denominationPriceSourceaddressAddress of the denomination price source for the DenominatedOracle contract
_invertedboolBoolean indicating if the denomination calculation quote should be inverted

IDisableableChild

Git Source

Inherits: IDisableable, IFactoryChild

IFactoryChild

Git Source

Functions

factory

Getter for the address of the factory that deployed the inheriting contract

function factory() external view returns (address _factory);

Returns

NameTypeDescription
_factoryaddressFactory address

Errors

NotFactoryDeployment

Throws when the contract is being deployed by a non-contract address

error NotFactoryDeployment();

CallerNotFactory

Throws when trying to call an onlyFactory function from a non-factory address

error CallerNotFactory();

IUniV3RelayerChild

Git Source

Inherits: IUniV3Relayer, IFactoryChild

IUniV3RelayerFactory

Git Source

Inherits: IAuthorizable

Functions

deployUniV3Relayer

Deploys a new UniV3Relayer contract

function deployUniV3Relayer(
  address _baseToken,
  address _quoteToken,
  uint24 _feeTier,
  uint32 _quotePeriod
) external returns (IBaseOracle _uniV3Relayer);

Parameters

NameTypeDescription
_baseTokenaddressAddress of the base token to be quoted
_quoteTokenaddressAddress of the quote reference token
_feeTieruint24Fee tier used to identify the UniV3 pool
_quotePerioduint32Length of the period used to calculate the TWAP quote

Returns

NameTypeDescription
_uniV3RelayerIBaseOracleAddress of the deployed UniV3Relayer contract

uniV3RelayersList

Getter for the list of UniV3Relayer contracts

function uniV3RelayersList() external view returns (address[] memory _uniV3RelayersList);

Returns

NameTypeDescription
_uniV3RelayersListaddress[]List of UniV3Relayer contracts

Events

NewUniV3Relayer

Emitted when a new UniV3Relayer contract is deployed

event NewUniV3Relayer(
  address indexed _uniV3Relayer, address _baseToken, address _quoteToken, uint24 _feeTier, uint32 _quotePeriod
);

Parameters

NameTypeDescription
_uniV3RelayeraddressAddress of the deployed UniV3Relayer contract
_baseTokenaddressAddress of the base token to be quoted by the UniV3Relayer contract
_quoteTokenaddressAddress of the quote reference token for the UniV3Relayer contract
_feeTieruint24Fee tier used to identify the pool for the UniV3Relayer contract
_quotePerioduint32Length of the period used to calculate the TWAP quote for the UniV3Relayer contract

Contents

IHaiDelegatee

Git Source

Functions

delegatee

Get the address of the delegatee of the contract

function delegatee() external view returns (address _delegatee);

Returns

NameTypeDescription
_delegateeaddressThe address of the delegatee

setDelegatee

Set the delegatee of the contract

function setDelegatee(address _delegatee) external;

Parameters

NameTypeDescription
_delegateeaddressThe address of the new delegatee

castVote

Cast a vote using the voting power delegated to this contract

function castVote(IGovernor _governor, uint256 _proposalId, uint8 _support) external returns (uint256 _weight);

Parameters

NameTypeDescription
_governorIGovernorThe governor contract to vote on
_proposalIduint256The id of the proposal
_supportuint8The vote type

Returns

NameTypeDescription
_weightuint256The weight of the vote

castVoteWithReason

Cast a vote with reason using the voting power delegated to this contract

function castVoteWithReason(
  IGovernor _governor,
  uint256 _proposalId,
  uint8 _support,
  string memory _reason
) external returns (uint256 _weight);

Parameters

NameTypeDescription
_governorIGovernorThe governor contract to vote on
_proposalIduint256The id of the proposal
_supportuint8The vote type
_reasonstringThe reason for the vote

Returns

NameTypeDescription
_weightuint256The weight of the vote

castVoteWithReasonAndParams

Cast a vote with reason and params using the voting power delegated to this contract

function castVoteWithReasonAndParams(
  IGovernor _governor,
  uint256 _proposalId,
  uint8 _support,
  string memory _reason,
  bytes memory _params
) external returns (uint256 _weight);

Parameters

NameTypeDescription
_governorIGovernorThe governor contract to vote on
_proposalIduint256The id of the proposal
_supportuint8The vote type
_reasonstringThe reason for the vote
_paramsbytesThe params for the vote

Events

DelegateeSet

Emitted when the delegatee of the contract is set

event DelegateeSet(address _delegatee);

Parameters

NameTypeDescription
_delegateeaddressThe address of the new delegatee

Errors

OnlyDelegatee

Throws if called by any account other than the delegatee

error OnlyDelegatee();

IHaiGovernor

Git Source

Structs

HaiGovernorParams

struct HaiGovernorParams {
  uint48 votingDelay;
  uint32 votingPeriod;
  uint48 quorumVoteExtension;
  uint256 proposalThreshold;
  uint256 quorumNumeratorValue;
  uint256 timelockMinDelay;
}

Contents

IAccountingJob

Git Source

Inherits: IAuthorizable, IModifiable, IJob

Functions

shouldWorkPopDebtFromQueue

Whether the pop debt from queue job should be worked

function shouldWorkPopDebtFromQueue() external view returns (bool _shouldWorkPopDebtFromQueue);

shouldWorkAuctionDebt

Whether the auction debt job should be worked

function shouldWorkAuctionDebt() external view returns (bool _shouldWorkAuctionDebt);

shouldWorkAuctionSurplus

Whether the auction surplus job should be worked

function shouldWorkAuctionSurplus() external view returns (bool _shouldWorkAuctionSurplus);

shouldWorkTransferExtraSurplus

Whether the transfer extra surplus job should be worked

function shouldWorkTransferExtraSurplus() external view returns (bool _shouldWorkTransferExtraSurplus);

accountingEngine

Address of the AccountingEngine contract

function accountingEngine() external view returns (IAccountingEngine _accountingEngine);

workPopDebtFromQueue

Rewarded method to pop debt from the AccountingEngine's queue

function workPopDebtFromQueue(uint256 _debtBlockTimestamp) external;

Parameters

NameTypeDescription
_debtBlockTimestampuint256Timestamp of the debt block to pop

workAuctionDebt

Rewarded method to auction debt from the AccountingEngine

function workAuctionDebt() external;

workAuctionSurplus

Rewarded method to auction surplus from the AccountingEngine

function workAuctionSurplus() external;

workTransferExtraSurplus

Rewarded method to transfer surplus from the AccountingEngine

function workTransferExtraSurplus() external;

IJob

Git Source

Inherits: IAuthorizable, IModifiable

Functions

rewardAmount

Amount of tokens to reward per job transaction [wad]

function rewardAmount() external view returns (uint256 _rewardAmount);

stabilityFeeTreasury

Address of the StabilityFeeTreasury contract

function stabilityFeeTreasury() external view returns (IStabilityFeeTreasury _stabilityFeeTreasury);

Events

Rewarded

Emitted when a reward is issued

event Rewarded(address _rewardedAccount, uint256 _rewardAmount);

Parameters

NameTypeDescription
_rewardedAccountaddressAccount that received the reward
_rewardAmountuint256Amount of reward issued [wad]

Errors

NotWorkable

Throws when trying to call a not-workable job function

error NotWorkable();

ILiquidationJob

Git Source

Inherits: IAuthorizable, IModifiable, IJob

Functions

shouldWork

Whether the liquidation job should be worked

function shouldWork() external view returns (bool _shouldWork);

liquidationEngine

Address of the LiquidationEngine contract

function liquidationEngine() external view returns (ILiquidationEngine _liquidationEngine);

workLiquidation

Rewarded method to liquidate a SAFE

function workLiquidation(bytes32 _cType, address _safe) external;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE to liquidate

IOracleJob

Git Source

Inherits: IAuthorizable, IModifiable, IJob

Functions

shouldWorkUpdateCollateralPrice

Whether the update collateral price job should be worked

function shouldWorkUpdateCollateralPrice() external view returns (bool _shouldWorkUpdateCollateralPrice);

shouldWorkUpdateRate

Whether the update rate job should be worked

function shouldWorkUpdateRate() external view returns (bool _shouldWorkUpdateRate);

oracleRelayer

Address of the OracleRelayer contract

function oracleRelayer() external view returns (IOracleRelayer _oracleRelayer);

pidRateSetter

Address of the PIDRateSetter contract

function pidRateSetter() external view returns (IPIDRateSetter _pidRateSetter);

workUpdateCollateralPrice

Rewarded method to update a collateral price

function workUpdateCollateralPrice(bytes32 _cType) external;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

workUpdateRate

Rewarded method to update the redemption rate

function workUpdateRate() external;

Errors

OracleJob_InvalidPrice

Throws when trying to update an invalid collateral price

error OracleJob_InvalidPrice();

Contents

IBaseOracle

Git Source

Basic interface for a system price feed All price feeds should be translated into an 18 decimals format

Functions

symbol

Symbol of the quote: token / baseToken (e.g. 'ETH / USD')

function symbol() external view returns (string memory _symbol);

getResultWithValidity

Fetch the latest oracle result and whether it is valid or not

This method should never revert

function getResultWithValidity() external view returns (uint256 _result, bool _validity);

read

Fetch the latest oracle result

Will revert if is the price feed is invalid

function read() external view returns (uint256 _value);

Errors

InvalidPriceFeed

error InvalidPriceFeed();

IBeefyVeloVaultRelayer

Git Source

Inherits: IBaseOracle

Functions

token0priceSource

Address of the token0 price source that is used to calculate the price

Assumes that the price source is a valid IBaseOracle

function token0priceSource() external view returns (IBaseOracle _token0priceSource);

token1priceSource

Address of the token1 price source that is used to calculate the price

Assumes that the price source is a valid IBaseOracle

function token1priceSource() external view returns (IBaseOracle _token1priceSource);

beefyVault

Address of the beefy vault

Assumes that the beefy vault is a valid IBeefyVaultV7

function beefyVault() external view returns (IBeefyVaultV7 _beefyVault);

veloPool

Address of the velo pool underlying the beefy vault

Assumes that the price source is a valid IVeloPool

function veloPool() external view returns (IVeloPool _veloPool);

Errors

BeefyVeloVaultRelayer_NullPriceSource

Throws if either the provided token0 price source or the token1 price source are null

error BeefyVeloVaultRelayer_NullPriceSource();

BeefyVeloVaultRelayer_NullBeefyVault

Throws if the provided beefy vault address is null

error BeefyVeloVaultRelayer_NullBeefyVault();

BeefyVeloVaultRelayer_NullVeloPool

Throws if the provided velo pool address is null

error BeefyVeloVaultRelayer_NullVeloPool();

BeefyVeloVaultRelayer_InvalidPriceSource

Throws if either of the provided price sources are invalid

error BeefyVeloVaultRelayer_InvalidPriceSource();

IChainlinkOracle

Git Source

Functions

decimals

function decimals() external view returns (uint8 _decimals);

description

function description() external view returns (string memory _description);

getAnswer

function getAnswer(uint256 _roundId) external view returns (int256 _answer);

getRoundData

function getRoundData(uint256 __roundId)
  external
  view
  returns (uint256 _roundId, int256 _answer, uint256 _startedAt, uint256 _updatedAt, uint256 _answeredInRound);

getTimestamp

function getTimestamp(uint256 _roundId) external view returns (uint256 _timestamp);

latestAnswer

function latestAnswer() external view returns (int256 _latestAnswer);

latestRound

function latestRound() external view returns (uint256 _latestRound);

latestRoundData

function latestRoundData()
  external
  view
  returns (uint256 _roundId, int256 _answer, uint256 _startedAt, uint256 _updatedAt, uint256 _answeredInRound);

latestTimestamp

function latestTimestamp() external view returns (uint256 _latestTimestamp);

IChainlinkRelayer

Git Source

Inherits: IBaseOracle

Functions

priceFeed

Address of the Chainlink price feed used to consult the price

function priceFeed() external view returns (IChainlinkOracle _priceFeed);

sequencerUptimeFeed

Address of the Chainlink sequencer uptime feed used to consult the sequencer status

function sequencerUptimeFeed() external view returns (IChainlinkOracle _sequencerUptimeFeed);

multiplier

The multiplier used to convert the quote into an 18 decimals format

function multiplier() external view returns (uint256 _multiplier);

staleThreshold

The time threshold after which a Chainlink response is considered stale

function staleThreshold() external view returns (uint256 _staleThreshold);

Errors

ChainlinkRelayer_NullPriceFeed

Throws if the provided price feed address is null

error ChainlinkRelayer_NullPriceFeed();

ChainlinkRelayer_NullSequencerUptimeFeed

Throws if the provided sequencer uptime feed address is null

error ChainlinkRelayer_NullSequencerUptimeFeed();

ChainlinkRelayer_NullStaleThreshold

Throws if the provided stale threshold is null

error ChainlinkRelayer_NullStaleThreshold();

IDelayedOracle

Git Source

Inherits: IBaseOracle

Functions

priceSource

Address of the non-delayed price source

Assumes that the price source is a valid IBaseOracle

function priceSource() external view returns (IBaseOracle _priceSource);

getNextResultWithValidity

The next valid price feed, taking effect at the next updateResult call

function getNextResultWithValidity() external view returns (uint256 _result, bool _validity);

Returns

NameTypeDescription
_resultuint256The value in 18 decimals format of the next price feed
_validityboolWhether the next price feed is valid or not

updateDelay

The delay in seconds that should elapse between updates

function updateDelay() external view returns (uint256 _updateDelay);

lastUpdateTime

The timestamp of the last update

function lastUpdateTime() external view returns (uint256 _lastUpdateTime);

shouldUpdate

Indicates if a delay has passed since the last update

function shouldUpdate() external view returns (bool _ok);

Returns

NameTypeDescription
_okboolWhether the oracle should be updated or not

updateResult

Updates the current price with the last next price, and reads the next price feed

Will revert if the delay since last update has not elapsed

function updateResult() external returns (bool _success);

Returns

NameTypeDescription
_successboolWhether the update was successful or not

Events

UpdateResult

Emitted when the oracle is updated

event UpdateResult(uint256 _newMedian, uint256 _lastUpdateTime);

Parameters

NameTypeDescription
_newMedianuint256The new median value
_lastUpdateTimeuint256The timestamp of the update

Errors

DelayedOracle_NullPriceSource

Throws if the provided price source address is null

error DelayedOracle_NullPriceSource();

DelayedOracle_NullDelay

Throws if the provided delay is null

error DelayedOracle_NullDelay();

DelayedOracle_DelayHasNotElapsed

Throws when trying to update the oracle before the delay has elapsed

error DelayedOracle_DelayHasNotElapsed();

DelayedOracle_NoCurrentValue

Throws when trying to read the current value and it is invalid

error DelayedOracle_NoCurrentValue();

Structs

Feed

struct Feed {
  uint256 value;
  bool isValid;
}

IDenominatedOracle

Git Source

Inherits: IBaseOracle

Functions

priceSource

Address of the base price source that is used to calculate the price

Assumes that the price source is a valid IBaseOracle

function priceSource() external view returns (IBaseOracle _priceSource);

denominationPriceSource

Address of the base price source that is used to calculate the denominated price

Assumes that the price source is a valid IBaseOracle

function denominationPriceSource() external view returns (IBaseOracle _denominationPriceSource);

inverted

Whether the price source quote should be inverted or not

Used to fix an inverted path of token quotes into a continuous chain of tokens (e.g. '(ETH / WBTC)^-1 * (ETH / USD)')

function inverted() external view returns (bool _inverted);

Errors

DenominatedOracle_NullPriceSource

Throws if either the provided price source or denominated price source are null

error DenominatedOracle_NullPriceSource();

IUniV3Relayer

Git Source

Inherits: IBaseOracle

Functions

uniV3Pool

Address of the UniswapV3Pool used to consult the TWAP

function uniV3Pool() external view returns (address _uniV3Pool);

baseToken

Address of the base token used to consult the quote from

function baseToken() external view returns (address _baseToken);

quoteToken

Address of the token used as a quote reference

function quoteToken() external view returns (address _quoteToken);

baseAmount

The amount in wei of the base token used to consult the pool for a quote

function baseAmount() external view returns (uint128 _baseAmount);

multiplier

The multiplier used to convert the quote into an 18 decimals format

function multiplier() external view returns (uint256 _multiplier);

quotePeriod

The length of the TWAP used to consult the pool

function quotePeriod() external view returns (uint32 _quotePeriod);

Errors

UniV3Relayer_InvalidPool

Throws if the provided pool (baseToken, quoteToken, feeTier) is non-existent

error UniV3Relayer_InvalidPool();

Contents

Contents

IBasicActions

Git Source

Inherits: ICommonActions

Functions

openSAFE

Opens a brand new SAFE

function openSAFE(address _manager, bytes32 _cType, address _usr) external returns (uint256 _safeId);

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_cTypebytes32Bytes32 representing the collateral type
_usraddressAddress of the SAFE owner

Returns

NameTypeDescription
_safeIduint256Id of the created SAFE

generateDebt

Generates debt and sends COIN amount to msg.sender

function generateDebt(
  address _manager,
  address _taxCollector,
  address _coinJoin,
  uint256 _safeId,
  uint256 _deltaWad
) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of COIN to generate [wad]

repayDebt

Repays an amount of debt

function repayDebt(
  address _manager,
  address _taxCollector,
  address _coinJoin,
  uint256 _safeId,
  uint256 _deltaWad
) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of COIN to repay [wad]

lockTokenCollateral

Locks a collateral token amount in the SAFE

function lockTokenCollateral(address _manager, address _collateralJoin, uint256 _safeId, uint256 _deltaWad) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_collateralJoinaddressAddress of the CollateralJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of collateral to collateralize [wad]

freeTokenCollateral

Unlocks a collateral token amount from the SAFE, and transfers the ERC20 collateral to the user's address

function freeTokenCollateral(address _manager, address _collateralJoin, uint256 _safeId, uint256 _deltaWad) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_collateralJoinaddressAddress of the CollateralJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of collateral to free [wad]

repayAllDebt

Repays the total amount of debt of a SAFE

This method is used to close a SAFE's debt, when the amount of debt is increasing due to stability fees

function repayAllDebt(address _manager, address _taxCollector, address _coinJoin, uint256 _safeId) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE

lockTokenCollateralAndGenerateDebt

Locks a collateral token amount in the SAFE and generates debt

function lockTokenCollateralAndGenerateDebt(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  uint256 _safe,
  uint256 _collateralAmount,
  uint256 _deltaWad
) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_collateralJoinaddressAddress of the CollateralJoin contract
_coinJoinaddressAddress of the CoinJoin contract
_safeuint256Id of the SAFE
_collateralAmountuint256Amount of collateral to collateralize [wad]
_deltaWaduint256Amount of COIN to generate [wad]

openLockTokenCollateralAndGenerateDebt

Creates a SAFE, locks a collateral token amount in it and generates debt

function openLockTokenCollateralAndGenerateDebt(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  bytes32 _cType,
  uint256 _collateralAmount,
  uint256 _deltaWad
) external returns (uint256 _safe);

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_collateralJoinaddressAddress of the CollateralJoin contract
_coinJoinaddressAddress of the CoinJoin contract
_cTypebytes32Bytes32 representing the collateral type
_collateralAmountuint256Amount of collateral to collateralize [wad]
_deltaWaduint256Amount of COIN to generate [wad]

Returns

NameTypeDescription
_safeuint256Id of the created SAFE

repayDebtAndFreeTokenCollateral

Repays debt and unlocks a collateral token amount from the SAFE

function repayDebtAndFreeTokenCollateral(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  uint256 _safeId,
  uint256 _collateralWad,
  uint256 _debtWad
) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_collateralJoinaddressAddress of the CollateralJoin contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE
_collateralWaduint256Amount of collateral to free [wad]
_debtWaduint256Amount of COIN to repay [wad]

repayAllDebtAndFreeTokenCollateral

Repays all debt and unlocks collateral from the SAFE

function repayAllDebtAndFreeTokenCollateral(
  address _manager,
  address _taxCollector,
  address _collateralJoin,
  address _coinJoin,
  uint256 _safeId,
  uint256 _collateralWad
) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_taxCollectoraddressAddress of the TaxCollector contract
_collateralJoinaddressAddress of the CollateralJoin contract
_coinJoinaddressAddress of the CoinJoin contract
_safeIduint256Id of the SAFE
_collateralWaduint256Amount of collateral to free [wad]

collectTokenCollateral

Collects a collateral token amount from the SAFE handler, and transfers the ERC20 collateral to the user's address

function collectTokenCollateral(address _manager, address _collateralJoin, uint256 _safeId, uint256 _deltaWad) external;

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_collateralJoinaddressAddress of the CollateralJoin contract
_safeIduint256Id of the SAFE
_deltaWaduint256Amount of collateral to collect [wad]

ICollateralBidActions

Git Source

Inherits: ICommonActions

Functions

buyCollateral

Buys collateral tokens from a collateral auction

This method will fail if the purchased amount is lower than the minimum, or the bid higher than the specified amount

function buyCollateral(
  address _coinJoin,
  address _collateralJoin,
  address _collateralAuctionHouse,
  uint256 _auctionId,
  uint256 _minCollateralAmount,
  uint256 _bidAmount
) external;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_collateralJoinaddressAddress of the CollateralJoin contract
_collateralAuctionHouseaddressAddress of the CollateralAuctionHouse contract
_auctionIduint256Id of the auction to bid on
_minCollateralAmountuint256Minimum amount of collateral tokens to buy [wad]
_bidAmountuint256Amount of system coins to bid [wad]

Errors

ColActions_InvalidAdjustedBid

Throws if the adjusted bid is invalid

error ColActions_InvalidAdjustedBid();

ColActions_InsufficientCollateralReceived

Throws if the received collateral is less than the minimum

error ColActions_InsufficientCollateralReceived(uint256 _minCollateralAmount, uint256 _received);

ICommonActions

Git Source

Functions

joinSystemCoins

Joins system coins into the safeEngine

function joinSystemCoins(address _coinJoin, address _dst, uint256 _wad) external;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_dstaddressAddress of the SAFE to join the coins into
_waduint256Amount of coins to join [wad]

exitSystemCoins

Exits system coins from the safeEngine

function exitSystemCoins(address _coinJoin, uint256 _coinsToExit) external;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_coinsToExituint256Amount of coins to exit [rad]

exitAllSystemCoins

Exits all system coins from the safeEngine

function exitAllSystemCoins(address _coinJoin) external;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract

exitCollateral

Exits collateral tokens from the safeEngine

function exitCollateral(address _collateralJoin, uint256 _wad) external;

Parameters

NameTypeDescription
_collateralJoinaddressAddress of the CollateralJoin contract
_waduint256Amount of collateral tokens to exit [wad]

Errors

OnlyDelegateCalls

Throws if the method is being directly called, without a delegate call

error OnlyDelegateCalls();

IDebtBidActions

Git Source

Inherits: ICommonActions

Functions

decreaseSoldAmount

Place a bid offering to receive a lesser amount of protocol tokens for covering the auctioned debt amount

function decreaseSoldAmount(
  address _coinJoin,
  address _debtAuctionHouse,
  uint256 _auctionId,
  uint256 _soldAmount
) external;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_debtAuctionHouseaddressAddress of the DebtAuctionHouse contract
_auctionIduint256Id of the auction to bid on
_soldAmountuint256Amount of protocol tokens to receive [wad]

settleAuction

Settles an auction, collecting the protocol tokens if the user is the highest bidder

This method will fail if the auction is not finished

function settleAuction(address _coinJoin, address _debtAuctionHouse, uint256 _auctionId) external;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_debtAuctionHouseaddressAddress of the DebtAuctionHouse contract
_auctionIduint256Id of the auction to settle

collectProtocolTokens

Collects the protocol tokens that the proxy has

This method is used to collect protocol tokens from an auction that was settled by another user

function collectProtocolTokens(address _protocolToken) external;

Parameters

NameTypeDescription
_protocolTokenaddressAddress of the protocol token

IGlobalSettlementActions

Git Source

Inherits: ICommonActions

Functions

freeCollateral

Free remaining collateral from a SAFE after being processed by the global settlement

function freeCollateral(
  address _manager,
  address _globalSettlement,
  address _collateralJoin,
  uint256 _safeId
) external returns (uint256 _collateralAmount);

Parameters

NameTypeDescription
_manageraddressAddress of the HaiSafeManager contract
_globalSettlementaddressAddress of the GlobalSettlement contract
_collateralJoinaddressAddress of the CollateralJoin contract
_safeIduint256Id of the SAFE to free collateral from

Returns

NameTypeDescription
_collateralAmountuint256Amount of collateral freed [wad]

prepareCoinsForRedeeming

Prepare coins for redeeming

function prepareCoinsForRedeeming(address _globalSettlement, address _coinJoin, uint256 _coinAmount) external;

Parameters

NameTypeDescription
_globalSettlementaddressAddress of the GlobalSettlement contract
_coinJoinaddressAddress of the CoinJoin contract
_coinAmountuint256Amount of coins to prepare for redeeming [wad]

redeemCollateral

Redeem collateral tokens from the global settlement

function redeemCollateral(
  address _globalSettlement,
  address _collateralJoin
) external returns (uint256 _collateralAmount);

Parameters

NameTypeDescription
_globalSettlementaddressAddress of the GlobalSettlement contract
_collateralJoinaddressAddress of the CollateralJoin contract

Returns

NameTypeDescription
_collateralAmountuint256Amount of collateral redeemed [wad]

IRewardedActions

Git Source

Inherits: ICommonActions

Functions

startDebtAuction

Starts a debt auction and transfers the reward to the user

function startDebtAuction(address _accountingJob, address _coinJoin) external;

Parameters

NameTypeDescription
_accountingJobaddressAddress of the AccountingJob contract
_coinJoinaddressAddress of the CoinJoin contract

startSurplusAuction

Starts a surplus auction and transfers the reward to the user

function startSurplusAuction(address _accountingJob, address _coinJoin) external;

Parameters

NameTypeDescription
_accountingJobaddressAddress of the AccountingJob contract
_coinJoinaddressAddress of the CoinJoin contract

popDebtFromQueue

Pops debt from accounting engine's queue and transfers the reward to the user

function popDebtFromQueue(address _accountingJob, address _coinJoin, uint256 _debtTimestamp) external;

Parameters

NameTypeDescription
_accountingJobaddressAddress of the AccountingJob contract
_coinJoinaddressAddress of the CoinJoin contract
_debtTimestampuint256Timestamp of the debt to pop from the queue

transferExtraSurplus

Transfers surplus from accounting engine and transfers the reward to the user

function transferExtraSurplus(address _accountingJob, address _coinJoin) external;

Parameters

NameTypeDescription
_accountingJobaddressAddress of the AccountingJob contract
_coinJoinaddressAddress of the CoinJoin contract

liquidateSAFE

Starts a liquidation and transfers the reward to the user

function liquidateSAFE(address _liquidationJob, address _coinJoin, bytes32 _cType, address _safe) external;

Parameters

NameTypeDescription
_liquidationJobaddressAddress of the LiquidationJob contract
_coinJoinaddressAddress of the CoinJoin contract
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE to liquidate

updateCollateralPrice

Updates the price of a collateral type and transfers the reward to the user

function updateCollateralPrice(address _oracleJob, address _coinJoin, bytes32 _cType) external;

Parameters

NameTypeDescription
_oracleJobaddressAddress of the OracleJob contract
_coinJoinaddressAddress of the CoinJoin contract
_cTypebytes32Bytes32 representation of the collateral type

updateRedemptionRate

Updates the redemption rate and transfers the reward to the user

function updateRedemptionRate(address _oracleJob, address _coinJoin) external;

Parameters

NameTypeDescription
_oracleJobaddressAddress of the OracleJob contract
_coinJoinaddressAddress of the CoinJoin contract

ISurplusBidActions

Git Source

Inherits: ICommonActions

Functions

increaseBidSize

Place a bid offering to provide a higher amount of coins for receiving the auctioned protocol tokens

function increaseBidSize(address _surplusAuctionHouse, uint256 _auctionId, uint256 _bidAmount) external;

Parameters

NameTypeDescription
_surplusAuctionHouseaddressAddress of the SurplusAuctionHouse contract
_auctionIduint256Id of the auction to bid on
_bidAmountuint256Amount of system coins to bid [wad]

settleAuction

Settles an auction, collecting the system coins if the user is the highest bidder

This method will fail if the auction is not finished

function settleAuction(address _coinJoin, address _surplusAuctionHouse, uint256 _auctionId) external;

Parameters

NameTypeDescription
_coinJoinaddressAddress of the CoinJoin contract
_surplusAuctionHouseaddressAddress of the SurplusAuctionHouse contract
_auctionIduint256Id of the auction to settle

IHaiProxy

Git Source

Inherits: IHaiOwnable2Step

Functions

execute

Executes a call to the target contract through a delegate call

The proxy will call the target through a delegate call (the target must not be a direct protocol contract)

function execute(address _target, bytes memory _data) external payable returns (bytes memory _response);

Parameters

NameTypeDescription
_targetaddressAddress of the target Actions contract
_databytesEncoded data of the transaction to execute

Returns

NameTypeDescription
_responsebytesThe raw response of the target call

Errors

TargetAddressRequired

Throws if the target address is null

error TargetAddressRequired();

IHaiProxyFactory

Git Source

Functions

isProxy

Mapping of proxy addresses to boolean state

function isProxy(address _proxyAddress) external view returns (bool _exists);

proxies

Mapping of user addresses to proxy instances

function proxies(address _owner) external view returns (IHaiProxy _proxy);

nonces

Mapping of the next nonce to be used for the specified owner

function nonces(address _owner) external view returns (uint256 _nonce);

build

Deploys a new proxy instance, setting the caller as the owner

function build() external returns (address payable _proxy);

Returns

NameTypeDescription
_proxyaddress payableAddress of the new proxy

build

Deploys a new proxy instance, setting the specified address as the owner

function build(address _owner) external returns (address payable _proxy);

Parameters

NameTypeDescription
_owneraddressAddress of the owner of the new proxy

Returns

NameTypeDescription
_proxyaddress payableAddress of the new proxy

Events

Created

Emitted when a new proxy is deployed

event Created(address indexed _sender, address indexed _owner, address _proxy);

Parameters

NameTypeDescription
_senderaddressAddress of the caller that deployed the proxy
_owneraddressAddress of the owner of the new proxy
_proxyaddressAddress of the new proxy

Errors

AlreadyHasProxy

Throws if the user already has a proxy and remains being the owner

error AlreadyHasProxy(address _owner, IHaiProxy _proxy);

IHaiSafeManager

Git Source

Functions

safeEngine

Address of the SAFEEngine

function safeEngine() external view returns (address _safeEngine);

safeCan

Mapping of owner and safe permissions to a caller permissions

function safeCan(address _owner, uint256 _safeId, address _caller) external view returns (bool _ok);

handlerCan

Mapping of handler to a caller permissions

function handlerCan(address _safeHandler, address _caller) external view returns (bool _ok);

getSafes

Getter for the list of safes owned by a user

function getSafes(address _usr) external view returns (uint256[] memory _safes);

Parameters

NameTypeDescription
_usraddressAddress of the user

Returns

NameTypeDescription
_safesuint256[]List of safe ids owned by the user

getSafes

Getter for the list of safes owned by a user for a given collateral type

function getSafes(address _usr, bytes32 _cType) external view returns (uint256[] memory _safes);

Parameters

NameTypeDescription
_usraddressAddress of the user
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_safesuint256[]List of safe ids owned by the user for the given collateral type

getSafesData

Getter for the details of the safes owned by a user

function getSafesData(address _usr)
  external
  view
  returns (uint256[] memory _safes, address[] memory _safeHandlers, bytes32[] memory _cTypes);

Parameters

NameTypeDescription
_usraddressAddress of the user

Returns

NameTypeDescription
_safesuint256[]List of safe ids owned by the user
_safeHandlersaddress[]List of safe handlers addresses owned by the user
_cTypesbytes32[]List of collateral types of the safes owned by the user

safeData

Getter for the details of a SAFE

function safeData(uint256 _safe) external view returns (SAFEData memory _sData);

Parameters

NameTypeDescription
_safeuint256Id of the SAFE

Returns

NameTypeDescription
_sDataSAFEDataStruct with the safe data

allowSAFE

Allow/disallow a user address to manage the safe

function allowSAFE(uint256 _safe, address _usr, bool _ok) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_usraddressAddress of the user to allow/disallow
_okboolBoolean state to allow/disallow

allowHandler

Allow/disallow a handler address to manage the safe

function allowHandler(address _usr, bool _ok) external;

Parameters

NameTypeDescription
_usraddressAddress of the user to allow/disallow
_okboolBoolean state to allow/disallow

openSAFE

Open a new safe for a user address

function openSAFE(bytes32 _cType, address _usr) external returns (uint256 _id);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_usraddressAddress of the user to open the safe for

Returns

NameTypeDescription
_iduint256Id of the new SAFE

transferSAFEOwnership

Initiate the transfer of the ownership of a safe to a dst address

function transferSAFEOwnership(uint256 _safe, address _dst) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_dstaddressAddress of the dst address

acceptSAFEOwnership

Accept the transfer of the ownership of a safe

function acceptSAFEOwnership(uint256 _safe) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE

modifySAFECollateralization

Modify a SAFE's collateralization ratio while keeping the generated COIN or collateral freed in the safe handler address

function modifySAFECollateralization(uint256 _safe, int256 _deltaCollateral, int256 _deltaDebt) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_deltaCollateralint256Delta of collateral to add/remove [wad]
_deltaDebtint256Delta of debt to add/remove [wad]

transferCollateral

Transfer wad amount of safe collateral from the safe address to a dst address

function transferCollateral(uint256 _safe, address _dst, uint256 _wad) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_dstaddressAddress of the dst address
_waduint256Amount of collateral to transfer [wad]

transferCollateral

Transfer wad amount of any type of collateral from the safe address to a dst address

This function has the purpose to take away collateral from the system that doesn't correspond to the safe but was sent there wrongly.

function transferCollateral(bytes32 _cType, uint256 _safe, address _dst, uint256 _wad) external;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeuint256Id of the SAFE
_dstaddressAddress of the dst address
_waduint256Amount of collateral to transfer [wad]

transferInternalCoins

Transfer an amount of COIN from the safe address to a dst address [rad]

function transferInternalCoins(uint256 _safe, address _dst, uint256 _rad) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_dstaddressAddress of the dst address
_raduint256Amount of COIN to transfer [rad]

quitSystem

Quit the system, migrating the safe (lockedCollateral, generatedDebt) to a different dst handler

function quitSystem(uint256 _safe, address _dst) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_dstaddressAddress of the dst handler

enterSystem

Enter the system, migrating the safe (lockedCollateral, generatedDebt) from a src handler to the safe handler

function enterSystem(address _src, uint256 _safe) external;

Parameters

NameTypeDescription
_srcaddressAddress of the src handler
_safeuint256Id of the SAFE

moveSAFE

Move a position from safeSrc handler to the safeDst handler

function moveSAFE(uint256 _safeSrc, uint256 _safeDst) external;

Parameters

NameTypeDescription
_safeSrcuint256Id of the source SAFE
_safeDstuint256Id of the destination SAFE

addSAFE

Add a safe to the user's list of safes (doesn't set safe ownership)

This function is meant to allow the user to add a safe to their list (if it was previously removed)

function addSAFE(uint256 _safe) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE

removeSAFE

Remove a safe from the user's list of safes (doesn't erase safe ownership)

This function is meant to allow the user to remove a safe from their list (if it was added against their will)

function removeSAFE(uint256 _safe) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE

protectSAFE

Choose a safe saviour inside LiquidationEngine for the SAFE

function protectSAFE(uint256 _safe, address _liquidationEngine, address _saviour) external;

Parameters

NameTypeDescription
_safeuint256Id of the SAFE
_liquidationEngineaddressAddress of the LiquidationEngine
_saviouraddressAddress of the saviour

Events

AllowSAFE

Emitted when calling allowSAFE with the sender address and the method arguments

event AllowSAFE(address indexed _sender, uint256 indexed _safe, address _usr, bool _ok);

AllowHandler

Emitted when calling allowHandler with the sender address and the method arguments

event AllowHandler(address indexed _sender, address _usr, bool _ok);

InitiateTransferSAFEOwnership

Emitted when calling initiateTransferSAFEOwnership with the sender address and the method arguments

event InitiateTransferSAFEOwnership(address indexed _sender, uint256 indexed _safe, address _dst);

TransferSAFEOwnership

Emitted when calling transferSAFEOwnership with the sender address and the method arguments

event TransferSAFEOwnership(address indexed _sender, uint256 indexed _safe, address _dst);

OpenSAFE

Emitted when calling openSAFE with the sender address and the method arguments

event OpenSAFE(address indexed _sender, address indexed _own, uint256 indexed _safe);

ModifySAFECollateralization

Emitted when calling modifySAFECollateralization with the sender address and the method arguments

event ModifySAFECollateralization(
  address indexed _sender, uint256 indexed _safe, int256 _deltaCollateral, int256 _deltaDebt
);

TransferCollateral

Emitted when calling transferCollateral with the sender address and the method arguments

event TransferCollateral(address indexed _sender, uint256 indexed _safe, address _dst, uint256 _wad);

TransferCollateral

Emitted when calling transferCollateral (specifying cType) with the sender address and the method arguments

event TransferCollateral(address indexed _sender, bytes32 _cType, uint256 indexed _safe, address _dst, uint256 _wad);

TransferInternalCoins

Emitted when calling transferInternalCoins with the sender address and the method arguments

event TransferInternalCoins(address indexed _sender, uint256 indexed _safe, address _dst, uint256 _rad);

QuitSystem

Emitted when calling quitSystem with the sender address and the method arguments

event QuitSystem(address indexed _sender, uint256 indexed _safe, address _dst);

EnterSystem

Emitted when calling enterSystem with the sender address and the method arguments

event EnterSystem(address indexed _sender, address _src, uint256 indexed _safe);

MoveSAFE

Emitted when calling moveSAFE with the sender address and the method arguments

event MoveSAFE(address indexed _sender, uint256 indexed _safeSrc, uint256 indexed _safeDst);

ProtectSAFE

Emitted when calling protectSAFE with the sender address and the method arguments

event ProtectSAFE(address indexed _sender, uint256 indexed _safe, address _liquidationEngine, address _saviour);

Errors

ZeroAddress

Throws if the provided address is null

error ZeroAddress();

SafeNotAllowed

Throws when trying to call a function not allowed for a given safe

error SafeNotAllowed();

HandlerNotAllowed

Throws when trying to call a function not allowed for a given handler

error HandlerNotAllowed();

AlreadySafeOwner

Throws when trying to transfer safe ownership to the current owner

error AlreadySafeOwner();

CollateralTypesMismatch

Throws when trying to move a safe to another one with different collateral type

error CollateralTypesMismatch();

Structs

SAFEData

struct SAFEData {
  address owner;
  address pendingOwner;
  address safeHandler;
  bytes32 collateralType;
}

Contents

IGlobalSettlement

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable

Functions

params

Getter for the contract parameters struct

function params() external view returns (GlobalSettlementParams memory _globalSettlementParams);

Returns

NameTypeDescription
_globalSettlementParamsGlobalSettlementParamsGlobalSettlement parameters struct

_params

Getter for the unpacked contract parameters struct

function _params() external view returns (uint256 _shutdownCooldown);

Returns

NameTypeDescription
_shutdownCooldownuint256Amount of seconds to wait before calculating redemptions after shutdown

shutdownTime

The timestamp when settlement was triggered

function shutdownTime() external view returns (uint256 _shutdownTime);

outstandingCoinSupply

The outstanding coin supply computed during the settlement process [rad]

function outstandingCoinSupply() external view returns (uint256 _outstandingCoinSupply);

finalCoinPerCollateralPrice

The final coin per collateral price computed during the settlement process

function finalCoinPerCollateralPrice(bytes32 _cType) external view returns (uint256 _finalCoinPerCollateralPrice);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_finalCoinPerCollateralPriceuint256The final amount of collateral that a system coin can redeem [rad]

collateralShortfall

The total amount of bad debt for a collateral type computed during the settlement process

function collateralShortfall(bytes32 _cType) external view returns (uint256 _collateralShortfall);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_collateralShortfalluint256The total amount of bad debt for a collateral type [wad]

collateralTotalDebt

The total amount of debt for a collateral type computed during the settlement process

function collateralTotalDebt(bytes32 _cType) external view returns (uint256 _collateralTotalDebt);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_collateralTotalDebtuint256The total amount of debt for a collateral type [wad]

collateralCashPrice

Final collateral cash price computed during the settlement process, accounting for surplus / shortfall

function collateralCashPrice(bytes32 _cType) external view returns (uint256 _collateralCashPrice);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_collateralCashPriceuint256The final collateral cash price [ray]

coinBag

Mapping containing the total amount of coins a user has prepared for redeeming

function coinBag(address _coinHolder) external view returns (uint256 _coinBag);

Parameters

NameTypeDescription
_coinHolderaddressThe address of the user

Returns

NameTypeDescription
_coinBaguint256Amount of coins prepared for redeeming [wad]

coinsUsedToRedeem

Mapping containing the total amount of coins a user has used to redeem collateral

function coinsUsedToRedeem(bytes32 _cType, address _coinHolder) external view returns (uint256 _coinsUsedToRedeem);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_coinHolderaddressThe address of the user

Returns

NameTypeDescription
_coinsUsedToRedeemuint256Amount of coins already used to redeem collateral [wad]

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

liquidationEngine

Address of the LiquidationEngine contract

function liquidationEngine() external view returns (ILiquidationEngine _liquidationEngine);

oracleRelayer

Address of the OracleRelayer contract

function oracleRelayer() external view returns (IOracleRelayer _oracleRelayer);

accountingEngine

Address of the AccountingEngine contract

function accountingEngine() external view returns (IDisableable _accountingEngine);

stabilityFeeTreasury

Address of the StabilityFeeTreasury contract

function stabilityFeeTreasury() external view returns (IDisableable _stabilityFeeTreasury);

coinJoin

Address of the CoinJoin contract

function coinJoin() external view returns (IDisableable _coinJoin);

collateralJoinFactory

Address of the CollateralJoinFactory contract

function collateralJoinFactory() external view returns (IDisableable _collateralJoinFactory);

collateralAuctionHouseFactory

Address of the CollateralAuctionHouseFactory contract

function collateralAuctionHouseFactory() external view returns (IDisableable _collateralAuctionHouseFactory);

shutdownSystem

Freeze the system and start the cooldown period

This function switches the whenEnabled/whenDisabled modifiers across the system contracts

function shutdownSystem() external;

freezeCollateralType

Calculate a collateral type's final price according to the latest system coin redemption price

function freezeCollateralType(bytes32 _cType) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral type to calculate the price for

fastTrackAuction

Fast track an ongoing collateral auction

function fastTrackAuction(bytes32 _cType, uint256 _auctionId) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral type associated with the auction contract
_auctionIduint256The ID of the auction to be fast tracked

processSAFE

Cancel a SAFE's debt and leave any extra collateral in it

function processSAFE(bytes32 _cType, address _safe) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral type associated with the SAFE
_safeaddressThe SAFE to be processed

freeCollateral

Remove collateral from the caller's SAFE (requires SAFE to have no debt)

function freeCollateral(bytes32 _cType) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral type to free

setOutstandingCoinSupply

Set the final outstanding supply of system coins

There must be no remaining surplus in the accounting engine

function setOutstandingCoinSupply() external;

calculateCashPrice

Calculate a collateral's price taking into consideration system surplus/deficit and the finalCoinPerCollateralPrice

function calculateCashPrice(bytes32 _cType) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral whose cash price will be calculated

prepareCoinsForRedeeming

Add coins into a 'bag' so that you can use them to redeem collateral

function prepareCoinsForRedeeming(uint256 _coinAmount) external;

Parameters

NameTypeDescription
_coinAmountuint256The amount of internal system coins to add into the bag

redeemCollateral

Redeem a specific collateral type using an amount of internal system coins from your bag

function redeemCollateral(bytes32 _cType, uint256 _coinsAmount) external;

Parameters

NameTypeDescription
_cTypebytes32The collateral type to redeem
_coinsAmountuint256The amount of internal coins to use from your bag

Events

ShutdownSystem

Emitted when the system is shutdown and the global settlement process begins

event ShutdownSystem();

FreezeCollateralType

Emitted when a collateral type's final price is calculated

event FreezeCollateralType(bytes32 indexed _cType, uint256 _finalCoinPerCollateralPrice);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_finalCoinPerCollateralPriceuint256The final amount of collateral that a system coin can redeem [rad]

FastTrackAuction

Emitted when a collateral auction is fast tracked

event FastTrackAuction(bytes32 indexed _cType, uint256 indexed _auctionId, uint256 _collateralTotalDebt);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_auctionIduint256The ID of the auction to be fast tracked
_collateralTotalDebtuint256The cumulative amount of debt for the collateral type [wad]

ProcessSAFE

Emitted when a SAFE is processed

event ProcessSAFE(bytes32 indexed _cType, address indexed _safe, uint256 _collateralShortfall);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the processed SAFE
_collateralShortfalluint256The cumulative amount of bad debt for the collateral type [wad]

FreeCollateral

Emitted when a SAFE's surplus collateral is withdrawn

event FreeCollateral(bytes32 indexed _cType, address indexed _sender, uint256 _collateralAmount);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_senderaddressAddress of the caller (representing the SAFE)
_collateralAmountuint256The amount of collateral withdrawn [wad]

SetOutstandingCoinSupply

Emitted when the final outstanding coin supply is set

event SetOutstandingCoinSupply(uint256 _outstandingCoinSupply);

Parameters

NameTypeDescription
_outstandingCoinSupplyuint256The final outstanding coin supply [rad]

CalculateCashPrice

Emitted when a collateral type's cash price is calculated

event CalculateCashPrice(bytes32 indexed _cType, uint256 _collateralCashPrice);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_collateralCashPriceuint256The final collateral cash price [ray]

PrepareCoinsForRedeeming

Emitted when a user adds coins into a 'bag' so that they can use them to redeem collateral

event PrepareCoinsForRedeeming(address indexed _sender, uint256 _coinBag);

Parameters

NameTypeDescription
_senderaddressAddress of the caller
_coinBaguint256The cumulative of coins prepared for redeeming [wad]

RedeemCollateral

Emitted when a user redeems a specific collateral type using an amount of internal system coins from their bag

event RedeemCollateral(
  bytes32 indexed _cType, address indexed _sender, uint256 _coinsAmount, uint256 _collateralAmount
);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_senderaddressAddress of the caller
_coinsAmountuint256The amount of internal coins used from the bag [wad]
_collateralAmountuint256The amount of collateral redeemed [wad]

Errors

GS_FinalCollateralPriceAlreadyDefined

Throws when trying to freeze a collateral type that has already been frozen

error GS_FinalCollateralPriceAlreadyDefined();

GS_FinalCollateralPriceNotDefined

Throws when trying to fast track an auction while the collateral type is not frozen

error GS_FinalCollateralPriceNotDefined();

GS_SafeDebtNotZero

Throws when trying to free the collateral from an unprocessed SAFE

error GS_SafeDebtNotZero();

GS_OutstandingCoinSupplyNotZero

Throws when trying to set the final outstanding coin supply, when it was already set

error GS_OutstandingCoinSupplyNotZero();

GS_OutstandingCoinSupplyZero

Throws when trying to set the final collateral cash price, when the outstanding coin supply was not set

error GS_OutstandingCoinSupplyZero();

GS_SurplusNotZero

Throws when trying to set the final outstanding coin supply, when there's still surplus in the protocol

error GS_SurplusNotZero();

GS_ShutdownCooldownNotFinished

Throws when trying to set the final outstanding coin supply, when the cooldown period has not passed

error GS_ShutdownCooldownNotFinished();

GS_CollateralCashPriceAlreadyDefined

Throws when trying to set the final collateral cash price, when it was already set

error GS_CollateralCashPriceAlreadyDefined();

GS_CollateralCashPriceNotDefined

Throws when trying to redeem collateral when the final collateral cash price was not set

error GS_CollateralCashPriceNotDefined();

GS_InsufficientBagBalance

Throws when trying to redeem more collateral than the user's bag can afford

error GS_InsufficientBagBalance();

Structs

GlobalSettlementParams

struct GlobalSettlementParams {
  uint256 shutdownCooldown;
}

IPostSettlementSurplusAuctionHouse

Git Source

Inherits: IAuthorizable, IModifiable, ICommonSurplusAuctionHouse

Functions

params

Getter for the contract parameters struct

function params() external view returns (PostSettlementSAHParams memory _pssahParams);

Returns

NameTypeDescription
_pssahParamsPostSettlementSAHParamsThe contract parameters struct

_params

Getter for the unpacked contract parameters struct

function _params() external view returns (uint256 _bidIncrease, uint256 _bidDuration, uint256 _totalAuctionLength);

Returns

NameTypeDescription
_bidIncreaseuint256A percentage of the last bid that needs to be added in order to take the new bid in consideration
_bidDurationuint256The duration of the bid after which an auction is considered finished
_totalAuctionLengthuint256The total duration of the auction after which an auction is considered finished

Structs

PostSettlementSAHParams

struct PostSettlementSAHParams {
  uint256 bidIncrease;
  uint256 bidDuration;
  uint256 totalAuctionLength;
}

ISettlementSurplusAuctioneer

Git Source

Inherits: IAuthorizable, IModifiable

Functions

lastSurplusTime

The last time when this contract triggered a surplus auction

function lastSurplusTime() external view returns (uint256 _lastSurplusTime);

accountingEngine

The address of the AccountingEngine

function accountingEngine() external view returns (IAccountingEngine _accountingEngine);

surplusAuctionHouse

The address of the SurplusAuctionHouse

function surplusAuctionHouse() external view returns (ISurplusAuctionHouse _surplusAuctionHouse);

safeEngine

The address of the SAFEEngine

function safeEngine() external view returns (ISAFEEngine _safeEngine);

auctionSurplus

Starts a new surplus auction

The contract reads surplus auction parameters from the AccountingEngine

function auctionSurplus() external returns (uint256 _id);

Returns

NameTypeDescription
_iduint256The id of the started auction

Events

AuctionSurplus

Emitted when the contract triggers a surplus auction

event AuctionSurplus(uint256 indexed _id, uint256 _lastSurplusAuctionTime, uint256 _coinBalance);

Parameters

NameTypeDescription
_iduint256The id of the started auction
_lastSurplusAuctionTimeuint256The timestamp of the surplus auction
_coinBalanceuint256The remaining coin balance of the contract

Errors

SSA_AccountingEngineStillEnabled

Throws if the AccountingEngine is still enabled

error SSA_AccountingEngineStillEnabled();

SSA_SurplusAuctionDelayNotPassed

Throws if the surplus auction delay has not passed

error SSA_SurplusAuctionDelayNotPassed();

Contents

IProtocolToken

Git Source

Inherits: IERC20Metadata, IERC20Permit, IVotes, IAuthorizable

Functions

mint

Mint an amount of tokens to an account

Only authorized addresses can mint tokens

function mint(address _account, uint256 _amount) external;

Parameters

NameTypeDescription
_accountaddressAddress of the account to mint tokens to
_amountuint256Amount of tokens to mint [wad]

burn

Burn an amount of tokens from the sender

function burn(uint256 _amount) external;

Parameters

NameTypeDescription
_amountuint256Amount of tokens to burn [wad]

unpause

Unpause the token transfers, minting and burning

Only authorized addresses can unpause the token

function unpause() external;

ISystemCoin

Git Source

Inherits: IERC20Metadata, IAuthorizable

Functions

mint

Mint an amount of tokens to an account

Only authorized addresses can mint tokens

function mint(address _account, uint256 _amount) external;

Parameters

NameTypeDescription
_accountaddressAddress of the account to mint tokens to
_amountuint256Amount of tokens to mint [wad]

burn

Burn an amount of tokens from the sender

function burn(uint256 _amount) external;

Parameters

NameTypeDescription
_amountuint256Amount of tokens to burn [wad]

ITokenDistributor

Git Source

Inherits: IAuthorizable

Functions

token

Address of the ERC20 token to be distributed

function token() external view returns (IProtocolToken _token);

root

The merkle root of the token distribution

function root() external view returns (bytes32 _root);

totalClaimable

Total amount of tokens to be distributed

function totalClaimable() external view returns (uint256 _totalClaimable);

claimPeriodStart

Timestamp when the claim period starts

function claimPeriodStart() external view returns (uint256 _claimPeriodStart);

claimPeriodEnd

Timestamp when the claim period ends

function claimPeriodEnd() external view returns (uint256 _claimPeriodEnd);

canClaim

Checks if a user can claim tokens

function canClaim(bytes32[] calldata _proof, address _user, uint256 _amount) external view returns (bool _claimable);

Parameters

NameTypeDescription
_proofbytes32[]Array of bytes32 merkle proof hashes
_useraddressAddress of the user to check
_amountuint256Amount of tokens to check

Returns

NameTypeDescription
_claimableboolWhether the user can claim the amount with the proof provided

claim

Claims tokens from the distributor

function claim(bytes32[] calldata _proof, uint256 _amount) external;

Parameters

NameTypeDescription
_proofbytes32[]Array of bytes32 merkle proof hashes
_amountuint256Amount of tokens to claim

claimAndDelegate

Claims tokens from the distributor and delegates them using a signature

function claimAndDelegate(
  bytes32[] calldata _proof,
  uint256 _amount,
  address _delegatee,
  uint256 _expiry,
  uint8 _v,
  bytes32 _r,
  bytes32 _s
) external;

Parameters

NameTypeDescription
_proofbytes32[]Array of bytes32 merkle proof hashes
_amountuint256Amount of tokens to claim
_delegateeaddressAddress to delegate the token votes to
_expiryuint256Expiration timestamp of the signature
_vuint8Recovery byte of the signature
_rbytes32ECDSA signature r value
_sbytes32ECDSA signature s value

claimed

Mapping containing the users that have already claimed

function claimed(address _user) external view returns (bool _claimed);

Parameters

NameTypeDescription
_useraddressAddress of the user to check

Returns

NameTypeDescription
_claimedboolBoolean indicating if the user has claimed

sweep

Withdraws tokens from the distributor to a given address after the claim period has ended

function sweep(address _sweepReceiver) external;

Parameters

NameTypeDescription
_sweepReceiveraddressAddress to send the tokens to

Events

Claimed

Emitted when a user claims tokens

event Claimed(address _user, uint256 _amount);

Parameters

NameTypeDescription
_useraddressAddress of the user that claimed
_amountuint256Amount of tokens claimed

Swept

Emitted when the distributor is swept (after the claim period has ended)

event Swept(address _sweepReceiver, uint256 _amount);

Parameters

NameTypeDescription
_sweepReceiveraddressAddress that received the swept tokens
_amountuint256Amount of tokens swept

Errors

TokenDistributor_ClaimPeriodNotEnded

Throws when trying to sweep before the claim period has ended

error TokenDistributor_ClaimPeriodNotEnded();

TokenDistributor_ClaimInvalid

Throws when trying to claim but the claim is not valid

error TokenDistributor_ClaimInvalid();

Structs

TokenDistributorParams

struct TokenDistributorParams {
  bytes32 root;
  uint256 totalClaimable;
  uint256 claimPeriodStart;
  uint256 claimPeriodEnd;
}

Contents

IAuthorizable

Git Source

Functions

authorizedAccounts

Checks whether an account is authorized on the contract

function authorizedAccounts(address _account) external view returns (bool _authorized);

Parameters

NameTypeDescription
_accountaddressAccount to check

Returns

NameTypeDescription
_authorizedboolWhether the account is authorized or not

authorizedAccounts

Getter for the authorized accounts

function authorizedAccounts() external view returns (address[] memory _accounts);

Returns

NameTypeDescription
_accountsaddress[]Array of authorized accounts

addAuthorization

Add authorization to an account

Method will revert if the account is already authorized

function addAuthorization(address _account) external;

Parameters

NameTypeDescription
_accountaddressAccount to add authorization to

removeAuthorization

Remove authorization from an account

Method will revert if the account is not authorized

function removeAuthorization(address _account) external;

Parameters

NameTypeDescription
_accountaddressAccount to remove authorization from

Events

AddAuthorization

Emitted when an account is authorized

event AddAuthorization(address _account);

Parameters

NameTypeDescription
_accountaddressAccount that is authorized

RemoveAuthorization

Emitted when an account is unauthorized

event RemoveAuthorization(address _account);

Parameters

NameTypeDescription
_accountaddressAccount that is unauthorized

Errors

AlreadyAuthorized

Throws if the account is already authorized on addAuthorization

error AlreadyAuthorized();

NotAuthorized

Throws if the account is not authorized on removeAuthorization

error NotAuthorized();

Unauthorized

Throws if the account is not authorized and tries to call an onlyAuthorized method

error Unauthorized();

ICoinJoin

Git Source

Inherits: IAuthorizable, IDisableable

Functions

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

systemCoin

Address of the SystemCoin contract

function systemCoin() external view returns (ISystemCoin _systemCoin);

decimals

Number of decimals the coin has

function decimals() external view returns (uint256 _decimals);

join

Join system coins in the system

Exited coins have 18 decimals but inside the system they have 45 [rad] decimals. When we join, the amount [wad] is multiplied by 10**27 [ray]

function join(address _account, uint256 _wad) external;

Parameters

NameTypeDescription
_accountaddressAccount that will receive the joined coins
_waduint256Amount of external coins to join [wad]

exit

Exit system coins from the system

New coins cannot be minted after the system is disabled

Inside the system, coins have 45 decimals [rad] but outside of it they have 18 decimals [wad]. When we exit, we specify a wad amount of coins and then the contract automatically multiplies wad by 10**27 to move the correct 45 decimal coin amount to this adapter

function exit(address _account, uint256 _wad) external;

Parameters

NameTypeDescription
_accountaddressAccount that will receive the exited coins
_waduint256Amount of internal coins to join (18 decimal number)

Events

Join

Emitted when an account joins coins into the system

event Join(address _sender, address _account, uint256 _wad);

Parameters

NameTypeDescription
_senderaddressAddress of the account that called the function (sent the ERC20 coins)
_accountaddressAddress of the account that received the coins
_waduint256Amount of coins joined [wad]

Exit

Emitted when an account exits coins from the system

event Exit(address _sender, address _account, uint256 _wad);

Parameters

NameTypeDescription
_senderaddressAddress of the account that called the function (sent the internal coins)
_accountaddressAddress of the account that received the ERC20 coins
_waduint256Amount of coins exited [wad]

ICollateralJoin

Git Source

Inherits: IAuthorizable, IDisableable

Functions

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

collateral

Address of the ERC20 collateral token contract

function collateral() external view returns (IERC20Metadata _collateral);

collateralType

The collateral type that this contract handles

function collateralType() external view returns (bytes32 _cType);

Returns

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateralType

decimals

Number of decimals of the collateral token

function decimals() external view returns (uint256 _decimals);

multiplier

Multiplier used to transform collateral into 18 decimals within the system

function multiplier() external view returns (uint256 _multiplier);

join

Join collateral in the system

function join(address _account, uint256 _wei) external;

Parameters

NameTypeDescription
_accountaddressAccount to which we add collateral into the system
_weiuint256Amount of collateral to transfer in the system (represented as a number with token decimals)

exit

Exit collateral from the system

function exit(address _account, uint256 _wei) external;

Parameters

NameTypeDescription
_accountaddressAccount to which we transfer the collateral out of the system
_weiuint256Amount of collateral to transfer to account (represented as a number with token decimals)

Events

Join

Emitted when an account joins collateral tokens into the system

event Join(address _sender, address _account, uint256 _wad);

Parameters

NameTypeDescription
_senderaddressAddress of the account that called the function (sent the ERC20 collateral tokens)
_accountaddressAddress of the account that received the collateral tokens
_waduint256Amount of collateral tokens joined [wad]

Exit

Emitted when an account exits collateral tokens from the system

event Exit(address _sender, address _account, uint256 _wad);

Parameters

NameTypeDescription
_senderaddressAddress of the account that called the function (sent the internal collateral tokens)
_accountaddressAddress of the account that received the ERC20 collateral tokens
_waduint256Amount of collateral tokens exited [wad]

IDisableable

Git Source

Inherits: IAuthorizable

Functions

contractEnabled

Check if the contract is enabled

function contractEnabled() external view returns (bool _contractEnabled);

Returns

NameTypeDescription
_contractEnabledboolTrue if the contract is enabled

disableContract

External method to trigger the contract disablement

Triggers an internal call to _onContractDisable virtual method

function disableContract() external;

Events

DisableContract

Emitted when the inheriting contract is disabled

event DisableContract();

Errors

ContractIsEnabled

Throws when trying to call a whenDisabled method when the contract is enabled

error ContractIsEnabled();

ContractIsDisabled

Throws when trying to call a whenEnabled method when the contract is disabled

error ContractIsDisabled();

NonDisableable

Throws when trying to disable a contract that cannot be disabled

error NonDisableable();

IHaiOwnable2Step

Git Source

Functions

owner

Emitted when an ownership transfer is initiated

Throws if the caller account is not authorized to perform an operation

Throws if the owner is not a valid owner account

The address of the current owner

function owner() external view returns (address _owner);

pendingOwner

The address of the pending owner

function pendingOwner() external view returns (address _pendingOwner);

renounceOwnership

Leaves the contract without an owner, thereby disabling any functionality that is only available to the owner

It will not be possible to call onlyOwner functions

Can only be called by the current owner

function renounceOwnership() external;

transferOwnership

Starts the ownership transfer of the contract to a new account

Replaces the pending transfer if there is one

Can only be called by the current owner

function transferOwnership(address _newOwner) external;

Parameters

NameTypeDescription
_newOwneraddressThe address of the new owner

acceptOwnership

Accepts the ownership transfer

Can only be called by the current pending owner

function acceptOwnership() external;

IModifiable

Git Source

Inherits: IAuthorizable

Functions

modifyParameters

Set a new value for a global specific parameter

function modifyParameters(bytes32 _param, bytes memory _data) external;

Parameters

NameTypeDescription
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

Events

ModifyParameters

Event topic 1 is always a parameter, topic 2 can be empty (global params)

event ModifyParameters(bytes32 indexed _param, bytes32 indexed _cType, bytes _data);

Errors

UnrecognizedParam

error UnrecognizedParam();

UnrecognizedCType

error UnrecognizedCType();

IModifiablePerCollateral

Git Source

Inherits: IAuthorizable, IModifiable

Functions

collateralList

List of all the collateral types registered in the OracleRelayer

function collateralList() external view returns (bytes32[] memory __collateralList);

Returns

NameTypeDescription
__collateralListbytes32[]Array of all the collateral types registered

initializeCollateralType

Register a new collateral type in the SAFEEngine

function initializeCollateralType(bytes32 _cType, bytes memory _collateralParams) external;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to register
_collateralParamsbytesCollateral parameters

modifyParameters

Set a new value for a collateral specific parameter

function modifyParameters(bytes32 _cType, bytes32 _param, bytes memory _data) external;

Parameters

NameTypeDescription
_cTypebytes32String identifier of the collateral to modify
_parambytes32String identifier of the parameter to modify
_databytesEncoded data to modify the parameter

Events

InitializeCollateralType

Emitted when a new collateral type is registered

event InitializeCollateralType(bytes32 _cType);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Errors

CollateralTypeAlreadyInitialized

error CollateralTypeAlreadyInitialized();

IAccountingEngine

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable

Functions

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

surplusAuctionHouse

Address of the SurplusAuctionHouse contract

function surplusAuctionHouse() external view returns (ISurplusAuctionHouse _surplusAuctionHouse);

debtAuctionHouse

Address of the DebtAuctionHouse contract

function debtAuctionHouse() external view returns (IDebtAuctionHouse _debtAuctionHouse);

postSettlementSurplusDrain

The post settlement surplus drain is used to transfer remaining surplus after settlement is triggered

Usually the SettlementSurplusAuctioneer contract

function postSettlementSurplusDrain() external view returns (address _postSettlementSurplusDrain);

Returns

NameTypeDescription
_postSettlementSurplusDrainaddressAddress of the contract that handles post settlement surplus

extraSurplusReceiver

The extra surplus receiver is used to transfer surplus if is not being auctioned

function extraSurplusReceiver() external view returns (address _extraSurplusReceiver);

Returns

NameTypeDescription
_extraSurplusReceiveraddressAddress of the contract that handles extra surplus transfers

params

Getter for the contract parameters struct

function params() external view returns (AccountingEngineParams memory _params);

Returns

NameTypeDescription
_paramsAccountingEngineParamsAccountingEngine parameters struct

_params

Getter for the unpacked contract parameters struct

function _params()
  external
  view
  returns (
    uint256 _surplusIsTransferred,
    uint256 _surplusDelay,
    uint256 _popDebtDelay,
    uint256 _disableCooldown,
    uint256 _surplusAmount,
    uint256 _surplusBuffer,
    uint256 _debtAuctionMintedTokens,
    uint256 _debtAuctionBidSize
  );

Returns

NameTypeDescription
_surplusIsTransferreduint256Whether the system transfers surplus instead of auctioning it [0/1]
_surplusDelayuint256Amount of seconds between surplus actions
_popDebtDelayuint256Amount of seconds after which debt can be popped from debtQueue
_disableCooldownuint256Amount of seconds to wait (post settlement) until surplus can be drained
_surplusAmountuint256Amount of surplus transferred or sold in one surplus action [rad]
_surplusBufferuint256Amount of surplus that needs to accrue in this contract before any surplus action can start [rad]
_debtAuctionMintedTokensuint256Amount of protocol tokens to be minted in debt auctions [wad]
_debtAuctionBidSizeuint256Amount of debt sold in one debt auction [rad]

totalOnAuctionDebt

The total amount of debt that is currently on auction in the DebtAuctionHouse

function totalOnAuctionDebt() external view returns (uint256 _totalOnAuctionDebt);

Returns

NameTypeDescription
_totalOnAuctionDebtuint256Total amount of debt that is currently on auction [rad]

debtQueue

A mapping storing debtBlocks that need to be covered by auctions

A debtBlock can be popped from the queue (to be auctioned) if more than popDebtDelay has elapsed since creation

function debtQueue(uint256 _blockTimestamp) external view returns (uint256 _debtBlock);

Parameters

NameTypeDescription
_blockTimestampuint256The timestamp of the debtBlock

Returns

NameTypeDescription
_debtBlockuint256The amount of debt created in the inputted blockTimestamp [rad]

totalQueuedDebt

The total amount of debt that is currently in the debtQueue to be auctioned

function totalQueuedDebt() external view returns (uint256 _totalQueuedDebt);

Returns

NameTypeDescription
_totalQueuedDebtuint256Total amount of debt in RAD that is currently in the debtQueue [rad]

lastSurplusTime

The timestamp of the last time surplus was transferred or auctioned

function lastSurplusTime() external view returns (uint256 _lastSurplusTime);

Returns

NameTypeDescription
_lastSurplusTimeuint256Timestamp of when the last surplus transfer or auction was triggered

unqueuedUnauctionedDebt

Returns the amount of bad debt that is not in the debtQueue and is not currently handled by debt auctions

The difference between the debt in the SAFEEngine and the debt in the debtQueue and on auction

function unqueuedUnauctionedDebt() external view returns (uint256 _unqueuedUnauctionedDebt);

Returns

NameTypeDescription
_unqueuedUnauctionedDebtuint256Amount of debt in RAD that is currently not in the debtQueue and not on auction [rad]

disableTimestamp

When the contract is disabled (usually by GlobalSettlement) it has to wait disableCooldown before any remaining surplus can be transferred to postSettlementSurplusDrain

function disableTimestamp() external view returns (uint256 _disableTimestamp);

Returns

NameTypeDescription
_disableTimestampuint256Timestamp of when the contract was disabled

pushDebtToQueue

Push a block of debt to the debt queue

Usually called by the LiquidationEngine when a SAFE is liquidated

Debt is locked in a queue to give the system enough time to auction collateral and gather surplus

function pushDebtToQueue(uint256 _debtBlock) external;

Parameters

NameTypeDescription
_debtBlockuint256Amount of debt to push [rad]

popDebtFromQueue

Pop a block of debt from the debt queue

A debtBlock can be popped from the queue after popDebtDelay seconds have passed since creation

function popDebtFromQueue(uint256 _debtBlockTimestamp) external;

Parameters

NameTypeDescription
_debtBlockTimestampuint256Timestamp of the block of debt that should be popped out

settleDebt

Destroy an equal amount of coins and debt

It can only destroy debt that is not locked in the queue and also not in a debt auction (unqueuedUnauctionedDebt)

function settleDebt(uint256 _rad) external;

Parameters

NameTypeDescription
_raduint256Amount of coins & debt to destroy [rad]

cancelAuctionedDebtWithSurplus

Use surplus coins to destroy debt that was in a debt auction

Usually called by the DebtAuctionHouse after a debt bid is made

function cancelAuctionedDebtWithSurplus(uint256 _rad) external;

Parameters

NameTypeDescription
_raduint256Amount of coins & debt to destroy with surplus [rad]

auctionDebt

Start a debt auction (print protocol tokens in exchange for coins so that the system can be recapitalized)

It can only auction debt that has been popped from the debt queue and is not already being auctioned

function auctionDebt() external returns (uint256 _id);

Returns

NameTypeDescription
_iduint256Id of the debt auction that was started

auctionSurplus

Start a surplus auction (sell surplus stability fees for protocol tokens)

It can only auction surplus if surplusIsTransferred is set to false

It can only auction surplus if surplusDelay seconds have elapsed since the last surplus auction/transfer was triggered

It can only auction surplus if enough surplus remains in the buffer and if there is no more debt left to settle

function auctionSurplus() external returns (uint256 _id);

Returns

NameTypeDescription
_iduint256Id of the surplus auction that was started

transferExtraSurplus

Transfer surplus to an address as an alternative to surplus auctions

It can only transfer surplus if surplusIsTransferred is set to true

It can only transfer surplus if surplusDelay seconds have elapsed since the last surplus auction/transfer was triggered

It can only transfer surplus if enough surplus remains in the buffer and if there is no more debt left to settle

function transferExtraSurplus() external;

transferPostSettlementSurplus

Transfer any remaining surplus after the disable cooldown has passed. Meant to be a backup in case GlobalSettlement.processSAFE has a bug, governance doesn't have power over the system and there's still surplus left in the AccountingEngine which then blocks GlobalSettlement.setOutstandingCoinSupply.

Transfer any remaining surplus after disableCooldown seconds have passed since disabling the contract

function transferPostSettlementSurplus() external;

Events

PushDebtToQueue

Emitted when a block of debt is pushed to the debt queue

event PushDebtToQueue(uint256 indexed _timestamp, uint256 _debtAmount);

Parameters

NameTypeDescription
_timestampuint256Timestamp of the block of debt that was pushed
_debtAmountuint256Amount of debt that was pushed [rad]

PopDebtFromQueue

Emitted when a block of debt is popped from the debt queue

event PopDebtFromQueue(uint256 indexed _timestamp, uint256 _debtAmount);

Parameters

NameTypeDescription
_timestampuint256Timestamp of the block of debt that was popped
_debtAmountuint256Amount of debt that was popped [rad]

SettleDebt

Emitted when the contract destroys an equal amount of coins and debt

event SettleDebt(uint256 _rad, uint256 _coinBalance, uint256 _debtBalance);

Parameters

NameTypeDescription
_raduint256Amount of coins & debt that was destroyed [rad]
_coinBalanceuint256Amount of coins that remains after debt settlement [rad]
_debtBalanceuint256Amount of debt that remains after debt settlement [rad]

CancelDebt

Emitted when the contract destroys an equal amount of coins and debt with surplus

Normally called with coins received from the DebtAuctionHouse

event CancelDebt(uint256 _rad, uint256 _coinBalance, uint256 _debtBalance);

Parameters

NameTypeDescription
_raduint256Amount of coins & debt that was destroyed with surplus [rad]
_coinBalanceuint256Amount of coins that remains after debt settlement [rad]
_debtBalanceuint256Amount of debt that remains after debt settlement [rad]

AuctionDebt

Emitted when a debt auction is started

event AuctionDebt(uint256 indexed _id, uint256 _initialBid, uint256 _debtAuctioned);

Parameters

NameTypeDescription
_iduint256Id of the debt auction that was started
_initialBiduint256Amount of protocol tokens that are initially offered in the debt auction [wad]
_debtAuctioneduint256Amount of debt that is being auctioned [rad]

AuctionSurplus

Emitted when a surplus auction is started

event AuctionSurplus(uint256 indexed _id, uint256 _initialBid, uint256 _surplusAuctioned);

Parameters

NameTypeDescription
_iduint256Id of the surplus auction that was started
_initialBiduint256Amount of protocol tokens that are initially bidded in the surplus auction [wad]
_surplusAuctioneduint256Amount of surplus that is being auctioned [rad]

TransferSurplus

Emitted when surplus is transferred to an address

event TransferSurplus(address indexed _extraSurplusReceiver, uint256 _surplusTransferred);

Parameters

NameTypeDescription
_extraSurplusReceiveraddressAddress that received the surplus
_surplusTransferreduint256Amount of surplus that was transferred [rad]

Errors

AccEng_DebtAuctionDisabled

Throws when trying to auction debt when it is disabled

error AccEng_DebtAuctionDisabled();

AccEng_SurplusAuctionDisabled

Throws when trying to auction surplus when it is disabled

error AccEng_SurplusAuctionDisabled();

AccEng_SurplusTransferDisabled

Throws when trying to transfer surplus when it is disabled

error AccEng_SurplusTransferDisabled();

AccEng_InsufficientDebt

Throws when trying to settle debt when there is not enough debt left to settle

error AccEng_InsufficientDebt();

AccEng_InsufficientSurplus

Throws when trying to auction / transfer surplus when there is not enough surplus

error AccEng_InsufficientSurplus();

AccEng_NullAmount

Throws when trying to push / pop / auction a null amount of debt / surplus

error AccEng_NullAmount();

AccEng_NullSurplusReceiver

Throws when trying to transfer surplus to a null address

error AccEng_NullSurplusReceiver();

AccEng_SurplusCooldown

Throws when trying to auction / transfer surplus before the cooldown has passed

error AccEng_SurplusCooldown();

AccEng_PopDebtCooldown

Throws when trying to pop debt before the cooldown has passed

error AccEng_PopDebtCooldown();

AccEng_PostSettlementCooldown

Throws when trying to transfer post-settlement surplus before the disable cooldown has passed

error AccEng_PostSettlementCooldown();

Structs

AccountingEngineParams

struct AccountingEngineParams {
  uint256 surplusIsTransferred;
  uint256 surplusDelay;
  uint256 popDebtDelay;
  uint256 disableCooldown;
  uint256 surplusAmount;
  uint256 surplusBuffer;
  uint256 debtAuctionMintedTokens;
  uint256 debtAuctionBidSize;
}

ICollateralAuctionHouse

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable

Functions

AUCTION_HOUSE_TYPE

Type of the auction house

function AUCTION_HOUSE_TYPE() external view returns (bytes32 _auctionHouseType);

Returns

NameTypeDescription
_auctionHouseTypebytes32Bytes32 representation of the auction house type

auctions

Data of an auction

function auctions(uint256 _auctionId) external view returns (Auction memory _auction);

Parameters

NameTypeDescription
_auctionIduint256Id of the auction

Returns

NameTypeDescription
_auctionAuctionAuction data struct

_auctions

Unpacked data of an auction

function _auctions(uint256 _auctionId)
  external
  view
  returns (
    uint256 _amountToSell,
    uint256 _amountToRaise,
    uint256 _initialTimestamp,
    address _forgoneCollateralReceiver,
    address _auctionIncomeRecipient
  );

Parameters

NameTypeDescription
_auctionIduint256Id of the auction

Returns

NameTypeDescription
_amountToSelluint256How much collateral is sold in an auction [wad]
_amountToRaiseuint256Total/max amount of coins to raise [rad]
_initialTimestampuint256Time when the auction was created
_forgoneCollateralReceiveraddressWho receives leftover collateral that is not sold in the auction (usually the liquidated SAFE)
_auctionIncomeRecipientaddressWho receives the coins raised by the auction (usually the AccountingEngine)

params

Getter for the contract parameters struct

function params() external view returns (CollateralAuctionHouseParams memory _cahParams);

Returns

NameTypeDescription
_cahParamsCollateralAuctionHouseParamsAuction house parameters struct

_params

Getter for the unpacked contract parameters struct

function _params()
  external
  view
  returns (uint256 _minimumBid, uint256 _minDiscount, uint256 _maxDiscount, uint256 _perSecondDiscountUpdateRate);

Returns

NameTypeDescription
_minimumBiduint256Minimum acceptable bid [wad]
_minDiscountuint256Minimum discount at which collateral is being sold [wad %]
_maxDiscountuint256Maximum discount at which collateral is being sold [wad %]
_perSecondDiscountUpdateRateuint256Rate at which the discount will be updated in an auction [ray]

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

liquidationEngine

Address of the LiquidationEngine contract

function liquidationEngine() external view returns (ILiquidationEngine _liquidationEngine);

oracleRelayer

Address of the OracleRelayer contract

function oracleRelayer() external view returns (IOracleRelayer _oracleRelayer);

collateralType

The collateral type of the auctions created by this contract

function collateralType() external view returns (bytes32 _cType);

Returns

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

auctionsStarted

Total amount of collateral auctions created

function auctionsStarted() external view returns (uint256 _auctionsStarted);

getAuctionDiscount

Calculates the current discount of an auction

function getAuctionDiscount(uint256 _id) external view returns (uint256 _auctionDiscount);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_auctionDiscountuint256Current discount of the auction [wad %]

getCollateralBought

Calculates the amount of collateral that will be bought with a given bid

function getCollateralBought(
  uint256 _id,
  uint256 _wad
) external view returns (uint256 _collateralBought, uint256 _adjustedBid);

Parameters

NameTypeDescription
_iduint256Id of the auction
_waduint256Bid amount [wad]

Returns

NameTypeDescription
_collateralBoughtuint256Amount of collateral that will be bought [wad]
_adjustedBiduint256Adjusted bid amount [wad]

buyCollateral

Buys collateral from an auction

function buyCollateral(uint256 _id, uint256 _wad) external returns (uint256 _boughtCollateral, uint256 _adjustedBid);

Parameters

NameTypeDescription
_iduint256Id of the auction
_waduint256Bid amount [wad]

Returns

NameTypeDescription
_boughtCollateraluint256Amount of collateral that was bought [wad]
_adjustedBiduint256Adjusted bid amount [wad]

startAuction

Starts a new collateral auction

function startAuction(
  address _forgoneCollateralReceiver,
  address _auctionIncomeRecipient,
  uint256 _amountToRaise,
  uint256 _collateralToSell
) external returns (uint256 _id);

Parameters

NameTypeDescription
_forgoneCollateralReceiveraddressWho receives leftover collateral that is not sold in the auction (usually the liquidated SAFE)
_auctionIncomeRecipientaddressWho receives the coins raised by the auction (usually the AccountingEngine)
_amountToRaiseuint256Total/max amount of coins to raise [rad]
_collateralToSelluint256How much collateral is sold in an auction [wad]

Returns

NameTypeDescription
_iduint256Id of the started auction

terminateAuctionPrematurely

Terminates an auction prematurely

Transfers collateral and coins to the authorized caller address

function terminateAuctionPrematurely(uint256 _auctionId) external;

Parameters

NameTypeDescription
_auctionIduint256Id of the auction

Events

StartAuction

Emitted when a new auction is started

event StartAuction(
  uint256 indexed _id,
  address indexed _auctioneer,
  uint256 _blockTimestamp,
  uint256 _amountToSell,
  uint256 _amountToRaise
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_auctioneeraddressAddress who started the auction
_blockTimestampuint256Time when the auction was started
_amountToSelluint256How much collateral is sold in an auction [wad]
_amountToRaiseuint256Total/max amount of coins to raise [rad]

BuyCollateral

Emitted when a bid is made in an auction

event BuyCollateral(
  uint256 indexed _id, address _bidder, uint256 _blockTimestamp, uint256 _raisedAmount, uint256 _soldAmount
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_bidderaddressWho made the bid
_blockTimestampuint256Time when the bid was made
_raisedAmountuint256Amount of coins raised in the bid [rad]
_soldAmountuint256Amount of collateral sold in the bid [wad]

SettleAuction

Emitted when an auction is settled

An auction is settled when either all collateral is sold or all coins are raised

event SettleAuction(
  uint256 indexed _id, uint256 _blockTimestamp, address _leftoverReceiver, uint256 _leftoverCollateral
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_blockTimestampuint256Time when the auction was settled
_leftoverReceiveraddressWho receives leftover collateral that is not sold in the auction (usually the liquidated SAFE)
_leftoverCollateraluint256Amount of leftover collateral that is not sold in the auction [wad]

TerminateAuctionPrematurely

Emitted when an auction is terminated prematurely

event TerminateAuctionPrematurely(
  uint256 indexed _id, uint256 _blockTimestamp, address _leftoverReceiver, uint256 _leftoverCollateral
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_blockTimestampuint256Time when the auction was terminated
_leftoverReceiveraddressWho receives leftover collateral that is not sold in the auction (usually the liquidated SAFE)
_leftoverCollateraluint256Amount of leftover collateral that is not sold in the auction [wad]

Errors

CAH_InvalidRedemptionPriceProvided

Throws when the redemption price is invalid

error CAH_InvalidRedemptionPriceProvided();

CAH_CollateralOracleInvalidValue

Throws when the collateral price is invalid

error CAH_CollateralOracleInvalidValue();

CAH_NoCollateralForSale

Throws when trying to start an auction without collateral to sell

error CAH_NoCollateralForSale();

CAH_NothingToRaise

Throws when trying to start an auction without coins to raise

error CAH_NothingToRaise();

CAH_DustyAuction

Throws when trying to start an auction with a dusty amount to raise

error CAH_DustyAuction();

CAH_InexistentAuction

Throws when trying to bid in a nonexistent auction

error CAH_InexistentAuction();

CAH_InvalidBid

Throws when trying to bid an invalid amount

error CAH_InvalidBid();

CAH_NullBoughtAmount

Throws when the resulting bid amount is null

error CAH_NullBoughtAmount();

CAH_InvalidLeftToRaise

Throws when the resulting bid leftover to raise is invalid

error CAH_InvalidLeftToRaise();

Structs

CollateralAuctionHouseParams

struct CollateralAuctionHouseParams {
  uint256 minimumBid;
  uint256 minDiscount;
  uint256 maxDiscount;
  uint256 perSecondDiscountUpdateRate;
}

Auction

struct Auction {
  uint256 amountToSell;
  uint256 amountToRaise;
  uint256 initialTimestamp;
  address forgoneCollateralReceiver;
  address auctionIncomeRecipient;
}

ICommonSurplusAuctionHouse

Git Source

Functions

AUCTION_HOUSE_TYPE

Type of the auction house

function AUCTION_HOUSE_TYPE() external view returns (bytes32 _auctionHouseType);

Returns

NameTypeDescription
_auctionHouseTypebytes32Bytes32 representation of the auction house type

auctions

Data of an auction

function auctions(uint256 _id) external view returns (Auction memory _auction);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_auctionAuctionAuction data struct

_auctions

Raw data of an auction

function _auctions(uint256 _id)
  external
  view
  returns (uint256 _bidAmount, uint256 _amountToSell, address _highBidder, uint256 _bidExpiry, uint256 _auctionDeadline);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_bidAmountuint256How many system coins are offered for the protocol tokens [rad]
_amountToSelluint256How protocol tokens are sold to buy the surplus system coins [wad]
_highBidderaddressWho the high bidder is
_bidExpiryuint256When the latest bid expires and the auction can be settled [timestamp]
_auctionDeadlineuint256Hard deadline for the auction after which no more bids can be placed [timestamp]

auctionsStarted

Total amount of surplus auctions created

function auctionsStarted() external view returns (uint256 _auctionsStarted);

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

protocolToken

Address of the ProtocolToken contract

function protocolToken() external view returns (IProtocolToken _protocolToken);

startAuction

Start a new surplus auction

function startAuction(uint256 _amountToSell, uint256 _initialBid) external returns (uint256 _id);

Parameters

NameTypeDescription
_amountToSelluint256Total amount of system coins to sell [rad]
_initialBiduint256Initial protocol token bid [wad]

Returns

NameTypeDescription
_iduint256ID of the started auction

restartAuction

Restart an auction if no bids were submitted for it

function restartAuction(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256ID of the auction to restart

increaseBidSize

Submit a higher protocol token bid for the same amount of system coins

function increaseBidSize(uint256 _id, uint256 _bid) external;

Parameters

NameTypeDescription
_iduint256ID of the auction you want to submit the bid for
_biduint256New bid submitted [wad]

settleAuction

Settle/finish an auction

function settleAuction(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256ID of the auction to settle

Events

StartAuction

Emitted when a new auction is started

event StartAuction(
  uint256 indexed _id,
  address indexed _auctioneer,
  uint256 _blockTimestamp,
  uint256 _amountToSell,
  uint256 _amountToRaise,
  uint256 _auctionDeadline
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_auctioneeraddressAddress who started the auction
_blockTimestampuint256Time when the auction was started
_amountToSelluint256How many protocol tokens are initially bidded [wad]
_amountToRaiseuint256Amount of system coins to raise [rad]
_auctionDeadlineuint256Time when the auction expires

RestartAuction

Emitted when an auction is restarted

event RestartAuction(uint256 indexed _id, uint256 _blockTimestamp, uint256 _auctionDeadline);

Parameters

NameTypeDescription
_iduint256Id of the auction
_blockTimestampuint256Time when the auction was restarted
_auctionDeadlineuint256New time when the auction expires

IncreaseBidSize

Emitted when a bid is made in an auction

event IncreaseBidSize(
  uint256 indexed _id,
  address _bidder,
  uint256 _blockTimestamp,
  uint256 _raisedAmount,
  uint256 _soldAmount,
  uint256 _bidExpiry
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_bidderaddressWho made the bid
_blockTimestampuint256Time when the bid was made
_raisedAmountuint256Amount of system coins raised in the bid [rad]
_soldAmountuint256Amount of protocol tokens offered to buy in the bid [wad]
_bidExpiryuint256Time when the bid expires

SettleAuction

Emitted when an auction is settled

event SettleAuction(uint256 indexed _id, uint256 _blockTimestamp, address _highBidder, uint256 _raisedAmount);

Parameters

NameTypeDescription
_iduint256Id of the auction
_blockTimestampuint256Time when the auction was settled
_highBidderaddressWho won the auction
_raisedAmountuint256Amount of system coins raised in the auction [rad]

Errors

SAH_AuctionNeverStarted

Throws when trying to bid in an auction that hasn't started yet

error SAH_AuctionNeverStarted();

SAH_AuctionNotFinished

Throws when trying to settle an auction that hasn't finished yet

error SAH_AuctionNotFinished();

SAH_AuctionAlreadyExpired

Throws when trying to bid in an auction that has already expired

error SAH_AuctionAlreadyExpired();

SAH_BidAlreadyExpired

Throws when trying to bid in an auction that has an expired bid

error SAH_BidAlreadyExpired();

SAH_BidAlreadyPlaced

Throws when trying to restart an auction that has an active bid

error SAH_BidAlreadyPlaced();

SAH_AmountsNotMatching

Throws when trying to place a bid that differs from the amount to raise

error SAH_AmountsNotMatching();

SAH_BidNotHigher

Throws when trying to place a bid that is not higher than the previous one

error SAH_BidNotHigher();

SAH_InsufficientIncrease

Throws when trying to place a bid that is not higher than the previous one by the minimum increase

error SAH_InsufficientIncrease();

SAH_HighBidderNotSet

Throws when trying to prematurely terminate an auction that has no bids

error SAH_HighBidderNotSet();

Structs

Auction

struct Auction {
  uint256 bidAmount;
  uint256 amountToSell;
  address highBidder;
  uint256 bidExpiry;
  uint256 auctionDeadline;
}

IDebtAuctionHouse

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable

Functions

AUCTION_HOUSE_TYPE

Type of the auction house

function AUCTION_HOUSE_TYPE() external view returns (bytes32 _auctionHouseType);

Returns

NameTypeDescription
_auctionHouseTypebytes32Bytes32 representation of the auction house type

auctions

Data of an auction

function auctions(uint256 _id) external view returns (Auction memory _auction);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_auctionAuctionAuction data struct

_auctions

Unpacked data of an auction

function _auctions(uint256 _id)
  external
  view
  returns (uint256 _bidAmount, uint256 _amountToSell, address _highBidder, uint256 _bidExpiry, uint256 _auctionDeadline);

Parameters

NameTypeDescription
_iduint256Id of the auction

Returns

NameTypeDescription
_bidAmountuint256How much protocol tokens are to be minted [wad]
_amountToSelluint256How many system coins are raised [rad]
_highBidderaddressAddress of the highest bidder
_bidExpiryuint256Time when the latest bid expires and the auction can be settled
_auctionDeadlineuint256Time when the auction expires

auctionsStarted

Total amount of debt auctions created

function auctionsStarted() external view returns (uint256 _auctionsStarted);

activeDebtAuctions

Total amount of simultaneous active debt auctions

function activeDebtAuctions() external view returns (uint256 _activeDebtAuctions);

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

protocolToken

Address of the ProtocolToken contract

function protocolToken() external view returns (IProtocolToken _protocolToken);

accountingEngine

Address of the AccountingEngine contract

function accountingEngine() external view returns (address _accountingEngine);

params

Getter for the contract parameters struct

function params() external view returns (DebtAuctionHouseParams memory _dahParams);

Returns

NameTypeDescription
_dahParamsDebtAuctionHouseParamsAuction house parameters struct

_params

Getter for the unpacked contract parameters struct

function _params()
  external
  view
  returns (uint256 _bidDecrease, uint256 _amountSoldIncrease, uint256 _bidDuration, uint256 _totalAuctionLength);

Returns

NameTypeDescription
_bidDecreaseuint256Minimum bid increase compared to the last bid in order to take the new one in consideration [wad %]
_amountSoldIncreaseuint256Increase in protocol tokens sold in case an auction is restarted [wad %]
_bidDurationuint256How long the auction lasts after a new bid is submitted [seconds]
_totalAuctionLengthuint256Total length of the auction [seconds]

startAuction

Start a new debt auction

function startAuction(
  address _incomeReceiver,
  uint256 _amountToSell,
  uint256 _initialBid
) external returns (uint256 _id);

Parameters

NameTypeDescription
_incomeReceiveraddressWho receives the auction proceeds
_amountToSelluint256Initial amount of protocol tokens to be minted [wad]
_initialBiduint256Amount of debt to be sold [rad]

Returns

NameTypeDescription
_iduint256Id of the auction

restartAuction

Restart an auction if no bids were placed

An auction can be restarted if the auction expired with no bids

function restartAuction(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256Id of the auction

decreaseSoldAmount

Decrease the protocol token amount you're willing to receive in exchange for providing the same amount of system coins being raised by the auction

function decreaseSoldAmount(uint256 _id, uint256 _amountToBuy) external;

Parameters

NameTypeDescription
_iduint256ID of the auction for which you want to submit a new bid
_amountToBuyuint256Amount of protocol tokens to buy (must be smaller than the previous proposed amount) [wad]

settleAuction

Settle an auction

Can only be called after the auction expired with a winning bid

function settleAuction(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256Id of the auction

terminateAuctionPrematurely

Terminate an auction prematurely

Can only be called after the contract is disabled

The method creates an unbacked debt position in the AccountingEngine for the remaining debt

function terminateAuctionPrematurely(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256Id of the auction

Events

StartAuction

Emitted when a new auction is started

event StartAuction(
  uint256 indexed _id,
  address indexed _auctioneer,
  uint256 _blockTimestamp,
  uint256 _amountToSell,
  uint256 _amountToRaise,
  uint256 _auctionDeadline
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_auctioneeraddressAddress who started the auction
_blockTimestampuint256Time when the auction was started
_amountToSelluint256How much protocol tokens are initially offered [wad]
_amountToRaiseuint256Amount of system coins to raise [rad]
_auctionDeadlineuint256Time when the auction expires

RestartAuction

Emitted when an auction is restarted

event RestartAuction(uint256 indexed _id, uint256 _blockTimestamp, uint256 _auctionDeadline);

Parameters

NameTypeDescription
_iduint256Id of the auction
_blockTimestampuint256Time when the auction was restarted
_auctionDeadlineuint256New time when the auction expires

DecreaseSoldAmount

Emitted when a bid is made in an auction

event DecreaseSoldAmount(
  uint256 indexed _id,
  address _bidder,
  uint256 _blockTimestamp,
  uint256 _raisedAmount,
  uint256 _soldAmount,
  uint256 _bidExpiry
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_bidderaddressWho made the bid
_blockTimestampuint256Time when the bid was made
_raisedAmountuint256Amount of system coins raised in the bid [rad]
_soldAmountuint256Amount of protocol tokens offered to buy in the bid [wad]
_bidExpiryuint256Time when the bid expires

SettleAuction

Emitted when an auction is settled

An auction is settled after the winning bid or the auction expire

event SettleAuction(uint256 indexed _id, uint256 _blockTimestamp, address _highBidder, uint256 _raisedAmount);

Parameters

NameTypeDescription
_iduint256Id of the auction
_blockTimestampuint256Time when the auction was settled
_highBidderaddressWho won the auction
_raisedAmountuint256Amount of system coins raised in the auction [rad]

TerminateAuctionPrematurely

Emitted when an auction is terminated prematurely

event TerminateAuctionPrematurely(
  uint256 indexed _id, uint256 _blockTimestamp, address _highBidder, uint256 _raisedAmount
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_blockTimestampuint256Time when the auction was terminated
_highBidderaddressWho won the auction
_raisedAmountuint256Amount of system coins raised in the auction [rad]

Errors

DAH_AuctionNeverStarted

Throws when trying to restart an auction that never started

error DAH_AuctionNeverStarted();

DAH_AuctionNotFinished

Throws when trying to restart an auction that is still active

error DAH_AuctionNotFinished();

DAH_BidAlreadyPlaced

Throws when trying to restart an auction that already has a winning bid

error DAH_BidAlreadyPlaced();

DAH_AuctionAlreadyExpired

Throws when trying to bid in an auction that already has expired

error DAH_AuctionAlreadyExpired();

DAH_BidAlreadyExpired

Throws when trying to bid in an auction that has a bid already expired

error DAH_BidAlreadyExpired();

DAH_NotMatchingBid

Throws when trying to bid in an auction with a bid that doesn't match the current bid

error DAH_NotMatchingBid();

DAH_AmountBoughtNotLower

Throws when trying to place a bid that is not lower than the current bid

error DAH_AmountBoughtNotLower();

DAH_InsufficientDecrease

Throws when trying to place a bid not lower than the current bid threshold

error DAH_InsufficientDecrease();

DAH_HighBidderNotSet

Throws when prematurely terminating an auction that has no bids

error DAH_HighBidderNotSet();

Structs

Auction

struct Auction {
  uint256 bidAmount;
  uint256 amountToSell;
  address highBidder;
  uint256 bidExpiry;
  uint256 auctionDeadline;
}

DebtAuctionHouseParams

struct DebtAuctionHouseParams {
  uint256 bidDecrease;
  uint256 amountSoldIncrease;
  uint256 bidDuration;
  uint256 totalAuctionLength;
}

ILiquidationEngine

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable, IModifiablePerCollateral

Functions

safeEngine

The SAFEEngine is used to query the state of the SAFEs, confiscate the collateral and transfer the debt

function safeEngine() external view returns (ISAFEEngine _safeEngine);

Returns

NameTypeDescription
_safeEngineISAFEEngineAddress of the contract that handles the state of the SAFEs

accountingEngine

The AccountingEngine is used to push the debt into the system, and set as the first bidder on the collateral auctions

function accountingEngine() external view returns (IAccountingEngine _accountingEngine);

Returns

NameTypeDescription
_accountingEngineIAccountingEngineAddress of the AccountingEngine

params

Getter for the contract parameters struct

function params() external view returns (LiquidationEngineParams memory _liqEngineParams);

Returns

NameTypeDescription
_liqEngineParamsLiquidationEngineParamsLiquidationEngine parameters struct

_params

Getter for the unpacked contract parameters struct

function _params() external view returns (uint256 _onAuctionSystemCoinLimit, uint256 _saviourGasLimit);

Returns

NameTypeDescription
_onAuctionSystemCoinLimituint256Max amount of system coins to be auctioned at the same time [rad]
_saviourGasLimituint256

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType) external view returns (LiquidationEngineCollateralParams memory _liqEngineCParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_liqEngineCParamsLiquidationEngineCollateralParamsLiquidationEngine collateral parameters struct

_cParams

Getter for the unpacked collateral parameters struct

function _cParams(bytes32 _cType)
  external
  view
  returns (address _collateralAuctionHouse, uint256 _liquidationPenalty, uint256 _liquidationQuantity);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_collateralAuctionHouseaddressAddress of the collateral auction house handling liquidations
_liquidationPenaltyuint256Penalty applied to every liquidation involving this collateral type [wad%]
_liquidationQuantityuint256Max amount of system coins to request in one auction for this collateral type [rad]

getLimitAdjustedDebtToCover

The limit adjusted debt to cover

function getLimitAdjustedDebtToCover(bytes32 _cType, address _safe) external view returns (uint256 _wad);

Parameters

NameTypeDescription
_cTypebytes32The SAFE's collateral type
_safeaddressThe SAFE's address

Returns

NameTypeDescription
_waduint256The limit adjusted debt to cover

currentOnAuctionSystemCoins

Total amount of system coins currently being auctioned

function currentOnAuctionSystemCoins() external view returns (uint256 _currentOnAuctionSystemCoins);

safeSaviours

Allowed contracts that can be chosen to save SAFEs from liquidation

function safeSaviours(address _saviour) external view returns (bool _canSave);

Parameters

NameTypeDescription
_saviouraddressThe SAFE saviour contract to check

Returns

NameTypeDescription
_canSaveboolWhether the contract can save SAFEs or not

chosenSAFESaviour

Saviour contract chosen for each SAFE by its owner

function chosenSAFESaviour(bytes32 _cType, address _safe) external view returns (address _saviour);

Parameters

NameTypeDescription
_cTypebytes32The SAFE's collateral type
_safeaddressThe SAFE's address

Returns

NameTypeDescription
_saviouraddressThe SAFE's saviour contract (address(0) if none)

removeCoinsFromAuction

Remove debt that was being auctioned

Usually called by CollateralAuctionHouse when an auction is settled

function removeCoinsFromAuction(uint256 _rad) external;

Parameters

NameTypeDescription
_raduint256The amount of debt in RAD to withdraw from currentOnAuctionSystemCoins

liquidateSAFE

Liquidate a SAFE

A SAFE can be liquidated if the accumulated debt plus the liquidation penalty is higher than the collateral value

function liquidateSAFE(bytes32 _cType, address _safe) external returns (uint256 _auctionId);

Parameters

NameTypeDescription
_cTypebytes32The SAFE's collateral type
_safeaddressThe SAFE's address

Returns

NameTypeDescription
_auctionIduint256The auction id of the collateral auction

protectSAFE

Choose a saviour contract for your SAFE

function protectSAFE(bytes32 _cType, address _safe, address _saviour) external;

Parameters

NameTypeDescription
_cTypebytes32The SAFE's collateral type
_safeaddressThe SAFE's address
_saviouraddressThe chosen saviour

connectSAFESaviour

Authed function to add contracts that can save SAFEs from liquidation

function connectSAFESaviour(address _saviour) external;

Parameters

NameTypeDescription
_saviouraddressSAFE saviour contract to be whitelisted

disconnectSAFESaviour

Authed function to remove contracts that can save SAFEs from liquidation

function disconnectSAFESaviour(address _saviour) external;

Parameters

NameTypeDescription
_saviouraddressSAFE saviour contract to be removed

Events

ConnectSAFESaviour

Emitted when a SAFE saviour contract is added to the allowlist

event ConnectSAFESaviour(address _saviour);

Parameters

NameTypeDescription
_saviouraddressSAFE saviour contract being allowlisted

DisconnectSAFESaviour

Emitted when a SAFE saviour contract is removed from the allowlist

event DisconnectSAFESaviour(address _saviour);

Parameters

NameTypeDescription
_saviouraddressSAFE saviour contract being removed from the allowlist

UpdateCurrentOnAuctionSystemCoins

Emitted when the current on auction system coins counter is updated

event UpdateCurrentOnAuctionSystemCoins(uint256 _currentOnAuctionSystemCoins);

Parameters

NameTypeDescription
_currentOnAuctionSystemCoinsuint256New value of the current on auction system coins counter

Liquidate

Emitted when a SAFE is liquidated

event Liquidate(
  bytes32 indexed _cType,
  address indexed _safe,
  uint256 _collateralAmount,
  uint256 _debtAmount,
  uint256 _amountToRaise,
  address _collateralAuctioneer,
  uint256 _auctionId
);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE being liquidated
_collateralAmountuint256Amount of collateral being confiscated [wad]
_debtAmountuint256Amount of debt being transferred [wad]
_amountToRaiseuint256Amount of system coins to raise in the collateral auction [rad]
_collateralAuctioneeraddressAddress of the collateral auctioneer contract handling the collateral auction
_auctionIduint256Id of the collateral auction

SaveSAFE

Emitted when a SAFE is saved from being liquidated by a SAFE saviour contract

event SaveSAFE(bytes32 indexed _cType, address indexed _safe, uint256 _collateralAddedOrDebtRepaid);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE being saved
_collateralAddedOrDebtRepaiduint256Amount of collateral being added or debt repaid [wad]

FailedSAFESave

Emitted when a SAFE saviour action is unsuccessful

event FailedSAFESave(bytes _failReason);

Parameters

NameTypeDescription
_failReasonbytesReason why the SAFE saviour action failed

ProtectSAFE

Emitted when a SAFE saviour contract is chosen for a SAFE

event ProtectSAFE(bytes32 indexed _cType, address indexed _safe, address _saviour);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE being saved
_saviouraddressAddress of the SAFE saviour contract chosen

Errors

LiqEng_SaviourNotOk

Throws when trying to add a reverting SAFE saviour to the allowlist

error LiqEng_SaviourNotOk();

LiqEng_InvalidAmounts

Throws when trying to add an invalid SAFE saviour to the allowlist

error LiqEng_InvalidAmounts();

LiqEng_CannotModifySAFE

Throws when trying to choose a SAFE saviour for a SAFE without the proper authorization

error LiqEng_CannotModifySAFE();

LiqEng_SaviourNotAuthorized

Throws when trying to choose a SAFE saviour that is not on the allowlist

error LiqEng_SaviourNotAuthorized();

LiqEng_SAFENotUnsafe

Throws when trying to liquidate a SAFE that is not unsafe

error LiqEng_SAFENotUnsafe();

LiqEng_LiquidationLimitHit

Throws when trying to simultaneously liquidate more debt than the limit allows

error LiqEng_LiquidationLimitHit();

LiqEng_InvalidSAFESaviourOperation

Throws when SAFE saviour action is invalid during a liquidation

error LiqEng_InvalidSAFESaviourOperation();

LiqEng_NullAuction

Throws when trying to liquidate a SAFE with a null amount of debt

error LiqEng_NullAuction();

LiqEng_NullCollateralToSell

Throws when trying to liquidate a SAFE with a null amount of collateral to sell

error LiqEng_NullCollateralToSell();

LiqEng_OnlyLiqEng

Throws when trying to call a function only the liquidator is allowed to call

error LiqEng_OnlyLiqEng();

Structs

LiquidationEngineParams

struct LiquidationEngineParams {
  uint256 onAuctionSystemCoinLimit;
  uint256 saviourGasLimit;
}

LiquidationEngineCollateralParams

struct LiquidationEngineCollateralParams {
  address collateralAuctionHouse;
  uint256 liquidationPenalty;
  uint256 liquidationQuantity;
}

IOracleRelayer

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable, IModifiablePerCollateral

Functions

safeEngine

The SAFEEngine is called to update the price of the collateral in the system

function safeEngine() external view returns (ISAFEEngine _safeEngine);

Returns

NameTypeDescription
_safeEngineISAFEEngineAddress of the contract that handles the state of the SAFEs

systemCoinOracle

The oracle used to fetch the system coin market price

function systemCoinOracle() external view returns (IBaseOracle _systemCoinOracle);

Returns

NameTypeDescription
_systemCoinOracleIBaseOracleAddress of the contract that provides the system coin price

params

Getter for the contract parameters struct

function params() external view returns (OracleRelayerParams memory _oracleRelayerParams);

Returns

NameTypeDescription
_oracleRelayerParamsOracleRelayerParamsAn OracleRelayerParams struct

_params

Getter for the unpacked contract parameters struct

function _params() external view returns (uint256 _redemptionRateUpperBound, uint256 _redemptionRateLowerBound);

Returns

NameTypeDescription
_redemptionRateUpperBounduint256Upper bound for the per-second redemption rate [ray]
_redemptionRateLowerBounduint256Lower bound for the per-second redemption rate [ray]

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType) external view returns (OracleRelayerCollateralParams memory _oracleRelayerCParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_oracleRelayerCParamsOracleRelayerCollateralParamsAn OracleRelayerCollateralParams struct

_cParams

Getter for the unpacked collateral parameters struct

function _cParams(bytes32 _cType)
  external
  view
  returns (IBaseOracle _oracle, uint256 _safetyCRatio, uint256 _liquidationCRatio);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_oracleIBaseOracleUsually a DelayedOracle that enforces delays to fresh price feeds
_safetyCRatiouint256CRatio used to compute the 'safePrice' - the price used when generating debt in SAFEEngine [ray]
_liquidationCRatiouint256CRatio used to compute the 'liquidationPrice' - the price used when liquidating SAFEs [ray]

calcRedemptionPrice

View method to fetch the current redemption price

function calcRedemptionPrice() external view returns (uint256 _redemptionPrice);

Returns

NameTypeDescription
_redemptionPriceuint256The current calculated redemption price [ray]

marketPrice

The current system coin market price

function marketPrice() external view returns (uint256 _marketPrice);

Returns

NameTypeDescription
_marketPriceuint256The current system coin market price [ray]

redemptionRate

The redemption rate is the rate at which the redemption price changes over time

By changing the redemption rate, it changes the incentives of the system users

The redemption rate is a per-second rate [ray]

function redemptionRate() external view returns (uint256 _redemptionRate);

Returns

NameTypeDescription
_redemptionRateuint256The current updated redemption rate [ray]

redemptionPriceUpdateTime

Last time when the redemption price was changed

Used to calculate the current redemption price

function redemptionPriceUpdateTime() external view returns (uint256 _redemptionPriceUpdateTime);

Returns

NameTypeDescription
_redemptionPriceUpdateTimeuint256The last time when the redemption price was changed [unix timestamp]

redemptionPrice

Fetch the latest redemption price by first updating it

function redemptionPrice() external returns (uint256 _updatedPrice);

Returns

NameTypeDescription
_updatedPriceuint256The newly updated redemption price [ray]

updateCollateralPrice

Update the collateral price inside the system (inside SAFEEngine)

Usually called by a keeper, incentivized by the system to keep the prices up to date

function updateCollateralPrice(bytes32 _cType) external;

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

updateRedemptionRate

Update the system redemption rate, the rate at which the redemption price changes over time

Usually called by the PIDRateSetter

function updateRedemptionRate(uint256 _redemptionRate) external;

Parameters

NameTypeDescription
_redemptionRateuint256The newly calculated redemption rate [ray]

Events

UpdateRedemptionPrice

Emitted when the redemption price is updated

event UpdateRedemptionPrice(uint256 _redemptionPrice);

Parameters

NameTypeDescription
_redemptionPriceuint256The new redemption price [ray]

UpdateCollateralPrice

Emitted when a collateral type price is updated

event UpdateCollateralPrice(
  bytes32 indexed _cType, uint256 _priceFeedValue, uint256 _safetyPrice, uint256 _liquidationPrice
);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_priceFeedValueuint256The new collateral price [wad]
_safetyPriceuint256The new safety price [ray]
_liquidationPriceuint256The new liquidation price [ray]

UpdateRedemptionRate

Emitted when the redemption rate is updated

event UpdateRedemptionRate(uint256 _redemptionRate);

Parameters

NameTypeDescription
_redemptionRateuint256The new redemption rate [ray]

Errors

OracleRelayer_RedemptionPriceNotUpdated

Throws if the redemption price is not updated when updating the rate

error OracleRelayer_RedemptionPriceNotUpdated();

OracleRelayer_CollateralTypeAlreadyInitialized

Throws when trying to initialize a collateral type that is already initialized

error OracleRelayer_CollateralTypeAlreadyInitialized();

Structs

OracleRelayerParams

struct OracleRelayerParams {
  uint256 redemptionRateUpperBound;
  uint256 redemptionRateLowerBound;
}

OracleRelayerCollateralParams

struct OracleRelayerCollateralParams {
  IBaseOracle oracle;
  uint256 safetyCRatio;
  uint256 liquidationCRatio;
}

IPIDController

Git Source

Inherits: IAuthorizable, IModifiable

Functions

seedProposer

Returns the address allowed to call computeRate method

function seedProposer() external view returns (address _seedProposer);

params

Getter for the contract parameters struct

function params() external view returns (PIDControllerParams memory _pidParams);

Returns

NameTypeDescription
_pidParamsPIDControllerParamsThe PID controller parameters struct

_params

Getter for the unpacked contract parameters struct

function _params()
  external
  view
  returns (
    uint256 _integralPeriodSize,
    uint256 _perSecondCumulativeLeak,
    uint256 _noiseBarrier,
    uint256 _feedbackOutputUpperBound,
    int256 _feedbackOutputLowerBound
  );

Returns

NameTypeDescription
_integralPeriodSizeuint256The minimum delay between two computeRate calls
_perSecondCumulativeLeakuint256The per second leak applied to priceDeviationCumulative before the latest deviation is added [ray]
_noiseBarrieruint256The minimum percentage deviation from the redemption price that allows the contract to calculate a non null redemption rate [wad]
_feedbackOutputUpperBounduint256The maximum value allowed for the redemption rate [ray]
_feedbackOutputLowerBoundint256The minimum value allowed for the redemption rate [ray]

deviationObservation

Returns the last deviation observation, containing latest timestamp, proportional and integral terms

function deviationObservation() external view returns (DeviationObservation memory __deviationObservation);

Returns

NameTypeDescription
__deviationObservationDeviationObservationThe last deviation observation struct

_deviationObservation

Raw data about the last deviation observation

function _deviationObservation() external view returns (uint256 _timestamp, int256 _proportional, int256 _integral);

Returns

NameTypeDescription
_timestampuint256The timestamp when this observation was stored
_proportionalint256The proportional term stored in this observation
_integralint256The integral term stored in this observation

controllerGains

Returns the Kp and Ki values used in this calculator

The values are expressed in WAD, Kp stands for proportional and Ki for integral terms

function controllerGains() external view returns (ControllerGains memory _cGains);

_controllerGains

Raw data about the Kp and Ki values used in this calculator

function _controllerGains() external view returns (int256 _kp, int256 _ki);

Returns

NameTypeDescription
_kpint256This value is multiplied with the proportional term
_kiint256This value is multiplied with priceDeviationCumulative

getBoundedRedemptionRate

Return a redemption rate bounded by feedbackOutputLowerBound and feedbackOutputUpperBound as well as the timeline over which that rate will take effect

function getBoundedRedemptionRate(int256 _piOutput) external view returns (uint256 _redemptionRate);

Parameters

NameTypeDescription
_piOutputint256The raw redemption rate computed from the proportional and integral terms

Returns

NameTypeDescription
_redemptionRateuint256The bounded redemption rate

computeRate

Compute a new redemption rate

function computeRate(uint256 _marketPrice, uint256 _redemptionPrice) external returns (uint256 _redemptionRate);

Parameters

NameTypeDescription
_marketPriceuint256The system coin market price
_redemptionPriceuint256The system coin redemption price

Returns

NameTypeDescription
_redemptionRateuint256The computed redemption rate

getGainAdjustedPIOutput

Apply Kp to the proportional term and Ki to the integral term (by multiplication) and then sum P and I

function getGainAdjustedPIOutput(
  int256 _proportionalTerm,
  int256 _integralTerm
) external view returns (int256 _piOutput);

Parameters

NameTypeDescription
_proportionalTermint256The proportional term
_integralTermint256The integral term

Returns

NameTypeDescription
_piOutputint256The sum of P and I

getGainAdjustedTerms

Independently return and calculate P * Kp and I * Ki

function getGainAdjustedTerms(
  int256 _proportionalTerm,
  int256 _integralTerm
) external view returns (int256 _proportionalGain, int256 _integralGain);

Parameters

NameTypeDescription
_proportionalTermint256The proportional term
_integralTermint256The integral term

Returns

NameTypeDescription
_proportionalGainint256The proportional gain
_integralGainint256The integral gain

getNextDeviationCumulative

Compute a new priceDeviationCumulative (integral term)

function getNextDeviationCumulative(
  int256 _proportionalTerm,
  uint256 _accumulatedLeak
) external returns (int256 _priceDeviationCumulative, int256 _timeAdjustedDeviation);

Parameters

NameTypeDescription
_proportionalTermint256The proportional term (redemptionPrice - marketPrice)
_accumulatedLeakuint256The total leak applied to priceDeviationCumulative before it is summed with the new time adjusted deviation

Returns

NameTypeDescription
_priceDeviationCumulativeint256The new priceDeviationCumulative
_timeAdjustedDeviationint256The new time adjusted deviation

breaksNoiseBarrier

Returns whether the P + I sum exceeds the noise barrier

function breaksNoiseBarrier(uint256 _piSum, uint256 _redemptionPrice) external view returns (bool _breaksNb);

Parameters

NameTypeDescription
_piSumuint256Represents a sum between P + I
_redemptionPriceuint256The system coin redemption price

Returns

NameTypeDescription
_breaksNbboolWhether the P + I sum exceeds the noise barrier

getNextRedemptionRate

Compute and return the upcoming redemption rate

function getNextRedemptionRate(
  uint256 _marketPrice,
  uint256 _redemptionPrice,
  uint256 _accumulatedLeak
) external view returns (uint256 _redemptionRate, int256 _proportionalTerm, int256 _integralTerm);

Parameters

NameTypeDescription
_marketPriceuint256The system coin market price
_redemptionPriceuint256The system coin redemption price
_accumulatedLeakuint256The total leak applied to priceDeviationCumulative before it is summed with the proportionalTerm

Returns

NameTypeDescription
_redemptionRateuint256The upcoming redemption rate
_proportionalTermint256The upcoming proportional term
_integralTermint256The upcoming integral term

timeSinceLastUpdate

Returns the time elapsed since the last computeRate call

function timeSinceLastUpdate() external view returns (uint256 _timeSinceLastValue);

Events

UpdateDeviation

Emitted when the state of the controller is updated

event UpdateDeviation(int256 _proportionalDeviation, int256 _integralDeviation, int256 _deltaIntegralDeviation);

Parameters

NameTypeDescription
_proportionalDeviationint256The new proportional term
_integralDeviationint256The new integral term
_deltaIntegralDeviationint256The delta between the new and the previous integral term

Errors

PIDController_OnlySeedProposer

Throws if the caller of updateRate is not the seed proposer

error PIDController_OnlySeedProposer();

PIDController_ComputeRateCooldown

Throws if the call to updateRate is too soon since last update

error PIDController_ComputeRateCooldown();

PIDController_CannotSetPriceDeviationCumulative

Throws when trying to set the integral term with the integral gain set on

error PIDController_CannotSetPriceDeviationCumulative();

Structs

PIDControllerParams

struct PIDControllerParams {
  uint256 integralPeriodSize;
  uint256 perSecondCumulativeLeak;
  uint256 noiseBarrier;
  uint256 feedbackOutputUpperBound;
  int256 feedbackOutputLowerBound;
}

DeviationObservation

struct DeviationObservation {
  uint256 timestamp;
  int256 proportional;
  int256 integral;
}

ControllerGains

struct ControllerGains {
  int256 kp;
  int256 ki;
}

IPIDRateSetter

Git Source

Inherits: IAuthorizable, IModifiable

Functions

oracleRelayer

The oracle relayer where the redemption price and rate are stored

function oracleRelayer() external view returns (IOracleRelayer _oracleRelayer);

pidCalculator

The PID calculator used to compute the redemption rate

function pidCalculator() external view returns (IPIDController _pidCalculator);

params

Getter for the contract parameters struct

function params() external view returns (PIDRateSetterParams memory _pidRateSetterParams);

Returns

NameTypeDescription
_pidRateSetterParamsPIDRateSetterParamsPIDRateSetter parameters struct

_params

Getter for the unpacked contract parameters struct

function _params() external view returns (uint256 _updateRateDelay);

Returns

NameTypeDescription
_updateRateDelayuint256Enforced gap between calls

lastUpdateTime

The timestamp of the last update

function lastUpdateTime() external view returns (uint256 _lastUpdateTime);

updateRate

Compute and set a new redemption rate

function updateRate() external;

Events

UpdateRedemptionRate

Emitted when the redemption rate is updated

event UpdateRedemptionRate(uint256 _marketPrice, uint256 _redemptionPrice, uint256 _redemptionRate);

Parameters

NameTypeDescription
_marketPriceuint256Computed price of the system coin
_redemptionPriceuint256Redemption price of the system coin
_redemptionRateuint256Resulting new redemption rate

Errors

PIDRateSetter_InvalidPriceFeed

Throws if the market price feed returns an invalid value

error PIDRateSetter_InvalidPriceFeed();

PIDRateSetter_RateSetterCooldown

Throws if the call to updateRate is too soon since last update

error PIDRateSetter_RateSetterCooldown();

Structs

PIDRateSetterParams

struct PIDRateSetterParams {
  uint256 updateRateDelay;
}

ISAFEEngine

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable, IModifiablePerCollateral

Functions

params

Getter for the contract parameters struct

function params() external view returns (SAFEEngineParams memory _safeEngineParams);

Returns

NameTypeDescription
_safeEngineParamsSAFEEngineParamsThe active SAFEEngineParams

_params

Getter for the unpacked contract parameters struct

function _params() external view returns (uint256 _safeDebtCeiling, uint256 _globalDebtCeiling);

Returns

NameTypeDescription
_safeDebtCeilinguint256Total amount of debt that a single safe can generate [wad]
_globalDebtCeilinguint256Maximum amount of debt that can be issued [rad]

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType) external view returns (SAFEEngineCollateralParams memory _safeEngineCParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_safeEngineCParamsSAFEEngineCollateralParamsSAFEEngineCollateralParams for the collateral type

_cParams

Getter for the unpacked collateral parameters struct

function _cParams(bytes32 _cType) external view returns (uint256 _debtCeiling, uint256 _debtFloor);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_debtCeilinguint256Maximum amount of debt that can be generated with this collateral type
_debtFlooruint256Minimum amount of debt that must be generated by a SAFE using this collateral

cData

Getter for the collateral data struct

function cData(bytes32 _cType) external view returns (SAFEEngineCollateralData memory _safeEngineCData);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_safeEngineCDataSAFEEngineCollateralDataSAFEEngineCollateralData for the collateral type

_cData

Getter for the unpacked collateral data struct

function _cData(bytes32 _cType)
  external
  view
  returns (
    uint256 _debtAmount,
    uint256 _lockedAmount,
    uint256 _accumulatedRate,
    uint256 _safetyPrice,
    uint256 _liquidationPrice
  );

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_debtAmountuint256Total amount of debt issued by a collateral type [wad]
_lockedAmountuint256Total amount of collateral locked in all SAFEs of the collateral type [wad]
_accumulatedRateuint256Accumulated rate of a collateral type [ray]
_safetyPriceuint256Floor price at which a SAFE is allowed to generate debt [ray]
_liquidationPriceuint256Price at which a SAFE gets liquidated [ray]

safes

Data about each SAFE

function safes(bytes32 _cType, address _safeAddress) external view returns (SAFE memory _safeData);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeAddressaddressAddress of the SAFE

Returns

NameTypeDescription
_safeDataSAFESAFE data for the specified collateral type of the specified safe.

_safes

Unpacked data about each SAFE

function _safes(
  bytes32 _cType,
  address _safeAddress
) external view returns (uint256 _lockedCollateral, uint256 _generatedDebt);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeAddressaddressAddress of the SAFE

Returns

NameTypeDescription
_lockedCollateraluint256Total amount of collateral locked in a SAFE [wad]
_generatedDebtuint256Total amount of debt generated by a SAFE [wad]

safeRights

Who can transfer collateral & debt in/out of a SAFE

function safeRights(address _caller, address _account) external view returns (bool _safeRights);

Parameters

NameTypeDescription
_calleraddressAddress to check for SAFE permissions for
_accountaddressAccount to check if caller has permissions for

Returns

NameTypeDescription
_safeRightsboolBoolean representation of the SAFE rights (0/1)

tokenCollateral

Balance of each collateral type

function tokenCollateral(bytes32 _cType, address _account) external view returns (uint256 _collateralBalance);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type to check balance for
_accountaddressAccount to check balance for

Returns

NameTypeDescription
_collateralBalanceuint256Collateral balance of the account [wad]

coinBalance

Internal balance of system coins held by an account

function coinBalance(address _account) external view returns (uint256 _balance);

Parameters

NameTypeDescription
_accountaddressAccount to check balance for

Returns

NameTypeDescription
_balanceuint256Internal coin balance of the account [rad]

debtBalance

Amount of debt held by an account

function debtBalance(address _account) external view returns (uint256 _debtBalance);

Parameters

NameTypeDescription
_accountaddressAccount to check balance for

Returns

NameTypeDescription
_debtBalanceuint256Debt balance of the account [rad]

globalDebt

Total amount of debt (coins) currently issued

function globalDebt() external returns (uint256 _globalDebt);

Returns

NameTypeDescription
_globalDebtuint256Global debt [rad]

globalUnbackedDebt

'Bad' debt that's not covered by collateral

function globalUnbackedDebt() external view returns (uint256 _globalUnbackedDebt);

Returns

NameTypeDescription
_globalUnbackedDebtuint256Global unbacked debt [rad]

transferCollateral

Transfer collateral between accounts

function transferCollateral(bytes32 _cType, address _source, address _destination, uint256 _wad) external;

Parameters

NameTypeDescription
_cTypebytes32Collateral type transferred
_sourceaddressCollateral source
_destinationaddressCollateral destination
_waduint256Amount of collateral transferred

transferInternalCoins

Transfer internal coins (does not affect external balances from Coin.sol)

function transferInternalCoins(address _source, address _destination, uint256 _rad) external;

Parameters

NameTypeDescription
_sourceaddressCoins source
_destinationaddressCoins destination
_raduint256Amount of coins transferred

modifyCollateralBalance

Join/exit collateral into and and out of the system

function modifyCollateralBalance(bytes32 _cType, address _account, int256 _wad) external;

Parameters

NameTypeDescription
_cTypebytes32Collateral type to join/exit
_accountaddressAccount that gets credited/debited
_wadint256Amount of collateral

modifySAFECollateralization

Add/remove collateral or put back/generate more debt in a SAFE

function modifySAFECollateralization(
  bytes32 _cType,
  address _safe,
  address _collateralSource,
  address _debtDestination,
  int256 _deltaCollateral,
  int256 _deltaDebt
) external;

Parameters

NameTypeDescription
_cTypebytes32Type of collateral to withdraw/deposit in and from the SAFE
_safeaddressTarget SAFE
_collateralSourceaddressAccount we take collateral from/put collateral into
_debtDestinationaddressAccount from which we credit/debit coins and debt
_deltaCollateralint256Amount of collateral added/extracted from the SAFE [wad]
_deltaDebtint256Amount of debt to generate/repay [wad]

transferSAFECollateralAndDebt

Transfer collateral and/or debt between SAFEs

function transferSAFECollateralAndDebt(
  bytes32 _cType,
  address _src,
  address _dst,
  int256 _deltaCollateral,
  int256 _deltaDebt
) external;

Parameters

NameTypeDescription
_cTypebytes32Collateral type transferred between SAFEs
_srcaddressSource SAFE
_dstaddressDestination SAFE
_deltaCollateralint256Amount of collateral to take/add into src and give/take from dst [wad]
_deltaDebtint256Amount of debt to take/add into src and give/take from dst [wad]

confiscateSAFECollateralAndDebt

Normally used by the LiquidationEngine in order to confiscate collateral and debt from a SAFE and give them to someone else

function confiscateSAFECollateralAndDebt(
  bytes32 _cType,
  address _safe,
  address _collateralSource,
  address _debtDestination,
  int256 _deltaCollateral,
  int256 _deltaDebt
) external;

Parameters

NameTypeDescription
_cTypebytes32Collateral type the SAFE has locked inside
_safeaddressTarget SAFE
_collateralSourceaddressWho we take/give collateral to
_debtDestinationaddressWho we take/give debt to
_deltaCollateralint256Amount of collateral taken/added into the SAFE [wad]
_deltaDebtint256Amount of debt taken/added into the SAFE [wad]

settleDebt

Nullify an amount of coins with an equal amount of debt

Coins & debt are like matter and antimatter, they nullify each other

function settleDebt(uint256 _rad) external;

Parameters

NameTypeDescription
_raduint256Amount of debt & coins to destroy

createUnbackedDebt

Allows an authorized contract to create debt without collateral

Usually called by DebtAuctionHouse in order to terminate auctions prematurely post settlement

function createUnbackedDebt(address _debtDestination, address _coinDestination, uint256 _rad) external;

Parameters

NameTypeDescription
_debtDestinationaddressThe account that will receive the newly created debt
_coinDestinationaddressThe account that will receive the newly created coins
_raduint256Amount of debt to create

updateAccumulatedRate

Allows an authorized contract to accrue interest on a specific collateral type

The rateMultiplier is usually calculated by the TaxCollector contract

function updateAccumulatedRate(bytes32 _cType, address _surplusDst, int256 _rateMultiplier) external;

Parameters

NameTypeDescription
_cTypebytes32Collateral type we accrue interest for
_surplusDstaddressDestination for the newly created surplus
_rateMultiplierint256Multiplier applied to the debtAmount in order to calculate the surplus [ray]

updateCollateralPrice

Allows an authorized contract to update the safety price and liquidation price of a collateral type

function updateCollateralPrice(bytes32 _cType, uint256 _safetyPrice, uint256 _liquidationPrice) external;

Parameters

NameTypeDescription
_cTypebytes32Collateral type we update the prices for
_safetyPriceuint256New safety price [ray]
_liquidationPriceuint256New liquidation price [ray]

approveSAFEModification

Allow an address to modify your SAFE

function approveSAFEModification(address _account) external;

Parameters

NameTypeDescription
_accountaddressAccount to give SAFE permissions to

denySAFEModification

Deny an address the rights to modify your SAFE

function denySAFEModification(address _account) external;

Parameters

NameTypeDescription
_accountaddressAccount that is denied SAFE permissions

canModifySAFE

Checks whether an account has the right to modify a SAFE

function canModifySAFE(address _safe, address _account) external view returns (bool _allowed);

Parameters

NameTypeDescription
_safeaddressThe safe to check
_accountaddressThe account to check

Returns

NameTypeDescription
_allowedboolWhether the account can modify the safe

Events

ApproveSAFEModification

Emitted when an address authorizes another address to modify its SAFE

event ApproveSAFEModification(address _sender, address _account);

Parameters

NameTypeDescription
_senderaddressAddress that sent the authorization
_accountaddressAddress that is authorized to modify the SAFE

DenySAFEModification

Emitted when an address denies another address to modify its SAFE

event DenySAFEModification(address _sender, address _account);

Parameters

NameTypeDescription
_senderaddressAddress that sent the denial
_accountaddressAddress that is denied to modify the SAFE

TransferCollateral

Emitted when collateral is transferred between accounts

event TransferCollateral(bytes32 indexed _cType, address indexed _src, address indexed _dst, uint256 _wad);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_srcaddressAddress that sent the collateral
_dstaddressAddress that received the collateral
_waduint256Amount of collateral transferred

TransferInternalCoins

Emitted when internal coins are transferred between accounts

event TransferInternalCoins(address indexed _src, address indexed _dst, uint256 _rad);

Parameters

NameTypeDescription
_srcaddressAddress that sent the coins
_dstaddressAddress that received the coins
_raduint256Amount of coins transferred

ModifySAFECollateralization

Emitted when the SAFE state is modified by the owner or authorized accounts

event ModifySAFECollateralization(
  bytes32 indexed _cType,
  address indexed _safe,
  address _collateralSource,
  address _debtDestination,
  int256 _deltaCollateral,
  int256 _deltaDebt
);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE
_collateralSourceaddressAddress that sent/receives the collateral
_debtDestinationaddressAddress that sent/receives the debt
_deltaCollateralint256Amount of collateral added/extracted from the SAFE [wad]
_deltaDebtint256Amount of debt to generate/repay [wad]

TransferSAFECollateralAndDebt

Emitted when collateral and/or debt is transferred between SAFEs

event TransferSAFECollateralAndDebt(
  bytes32 indexed _cType, address indexed _src, address indexed _dst, int256 _deltaCollateral, int256 _deltaDebt
);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_srcaddressAddress that sent the collateral
_dstaddressAddress that received the collateral
_deltaCollateralint256Amount of collateral to take/add into src and give/take from dst [wad]
_deltaDebtint256Amount of debt to take/add into src and give/take from dst [wad]

ConfiscateSAFECollateralAndDebt

Emitted when collateral and debt is confiscated from a SAFE

event ConfiscateSAFECollateralAndDebt(
  bytes32 indexed _cType,
  address indexed _safe,
  address _collateralSource,
  address _debtDestination,
  int256 _deltaCollateral,
  int256 _deltaDebt
);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safeaddressAddress of the SAFE
_collateralSourceaddressAddress that sent/receives the collateral
_debtDestinationaddressAddress that sent/receives the debt
_deltaCollateralint256Amount of collateral added/extracted from the SAFE [wad]
_deltaDebtint256Amount of debt to generate/repay [wad]

SettleDebt

Emitted when an account's debt is settled with coins

Accounts (not SAFEs) can only settle unbacked debt

event SettleDebt(address indexed _account, uint256 _rad);

Parameters

NameTypeDescription
_accountaddressAddress of the account
_raduint256Amount of debt & coins to destroy

CreateUnbackedDebt

Emitted when an unbacked debt is created to an account

event CreateUnbackedDebt(address indexed _debtDestination, address indexed _coinDestination, uint256 _rad);

Parameters

NameTypeDescription
_debtDestinationaddressAddress that received the newly created debt
_coinDestinationaddressAddress that received the newly created coins
_raduint256Amount of debt to create

UpdateAccumulatedRate

Emit when the accumulated rate of a collateral type is updated

event UpdateAccumulatedRate(bytes32 indexed _cType, address _surplusDst, int256 _rateMultiplier);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_surplusDstaddressAddress that received the newly created surplus
_rateMultiplierint256Delta of the accumulated rate [ray]

UpdateCollateralPrice

Emitted when the safety price and liquidation price of a collateral type is updated

event UpdateCollateralPrice(bytes32 indexed _cType, uint256 _safetyPrice, uint256 _liquidationPrice);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_safetyPriceuint256New price at which a SAFE is allowed to generate debt [ray]
_liquidationPriceuint256New price at which a SAFE gets liquidated [ray]

Errors

SAFEEng_CollateralTypeNotInitialized

Throws when trying to modify parameters of an uninitialized collateral type

error SAFEEng_CollateralTypeNotInitialized();

SAFEEng_SAFENotSafe

Throws when trying to modify a SAFE into an unsafe state

error SAFEEng_SAFENotSafe();

SAFEEng_DustySAFE

Throws when trying to modify a SAFE into a dusty safe (debt non-zero and below debtFloor)

error SAFEEng_DustySAFE();

SAFEEng_GlobalDebtCeilingHit

Throws when trying to generate debt that would put the system over the global debt ceiling

error SAFEEng_GlobalDebtCeilingHit();

SAFEEng_CollateralDebtCeilingHit

Throws when trying to generate debt that would put the system over the collateral debt ceiling

error SAFEEng_CollateralDebtCeilingHit();

SAFEEng_SAFEDebtCeilingHit

Throws when trying to generate debt that would put the SAFE over the SAFE debt ceiling

error SAFEEng_SAFEDebtCeilingHit();

SAFEEng_NotSAFEAllowed

Throws when an account tries to modify a SAFE without the proper permissions

error SAFEEng_NotSAFEAllowed();

SAFEEng_NotCollateralSrcAllowed

Throws when an account tries to pull collateral from a SAFE without the proper permissions

error SAFEEng_NotCollateralSrcAllowed();

SAFEEng_NotDebtDstAllowed

Throws when an account tries to push debt to a SAFE without the proper permissions

error SAFEEng_NotDebtDstAllowed();

Structs

SAFE

struct SAFE {
  uint256 lockedCollateral;
  uint256 generatedDebt;
}

SAFEEngineParams

struct SAFEEngineParams {
  uint256 safeDebtCeiling;
  uint256 globalDebtCeiling;
}

SAFEEngineCollateralData

struct SAFEEngineCollateralData {
  uint256 debtAmount;
  uint256 lockedAmount;
  uint256 accumulatedRate;
  uint256 safetyPrice;
  uint256 liquidationPrice;
}

SAFEEngineCollateralParams

struct SAFEEngineCollateralParams {
  uint256 debtCeiling;
  uint256 debtFloor;
}

IStabilityFeeTreasury

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable

Functions

allowance

Getter for the allowance struct of a given account

function allowance(address _account) external view returns (Allowance memory __allowance);

Parameters

NameTypeDescription
_accountaddressThe account to query

Returns

NameTypeDescription
__allowanceAllowanceData structure containing total and per hour allowance for the given account

_allowance

Getter for the unpacked allowance struct of a given account

A null per hour allowance means that the account has no per hour limit

function _allowance(address _account) external view returns (uint256 _total, uint256 _perHour);

Parameters

NameTypeDescription
_accountaddressThe account to query

Returns

NameTypeDescription
_totaluint256Total allowance for the given account
_perHouruint256Per hour allowance for the given account

setTotalAllowance

Modify an address' total allowance in order to withdraw SF from the treasury

function setTotalAllowance(address _account, uint256 _rad) external;

Parameters

NameTypeDescription
_accountaddressThe approved address
_raduint256The total approved amount of SF to withdraw [rad]

setPerHourAllowance

Modify an address' per hour allowance in order to withdraw SF from the treasury

function setPerHourAllowance(address _account, uint256 _rad) external;

Parameters

NameTypeDescription
_accountaddressThe approved address
_raduint256The per hour approved amount of SF to withdraw [rad]

giveFunds

Governance transfers SF to an address

function giveFunds(address _account, uint256 _rad) external;

Parameters

NameTypeDescription
_accountaddressAddress to transfer SF to
_raduint256Amount of internal system coins to transfer [rad]

takeFunds

Governance takes funds from an address

function takeFunds(address _account, uint256 _rad) external;

Parameters

NameTypeDescription
_accountaddressAddress to take system coins from
_raduint256Amount of internal system coins to take from the account [rad]

pullFunds

Pull stability fees from the treasury

The caller of this method needs to have enough allowance in order to pull funds

function pullFunds(address _dstAccount, uint256 _wad) external;

Parameters

NameTypeDescription
_dstAccountaddressAddress to transfer funds to
_waduint256Amount of system coins (SF) to transfer [wad]

transferSurplusFunds

Transfer surplus stability fees to the extraSurplusReceiver. This is here to make sure that the treasury doesn't accumulate fees that it doesn't even need in order to pay for allowances. It ensures that there are enough funds left in the treasury to account for posterior expenses

function transferSurplusFunds() external;

settleDebt

Settle as much bad debt as possible (if this contract has any)

function settleDebt() external returns (uint256 _coinBalance, uint256 _debtBalance);

Returns

NameTypeDescription
_coinBalanceuint256Amount of internal system coins that this contract has after settling debt
_debtBalanceuint256Amount of bad debt that this contract has after settling debt

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

coinJoin

Address of the CoinJoin contract

function coinJoin() external view returns (ICoinJoin _coinJoin);

extraSurplusReceiver

Address that receives surplus funds when treasury exceeds capacity (or is disabled)

function extraSurplusReceiver() external view returns (address _extraSurplusReceiver);

systemCoin

Address of the SystemCoin contract

function systemCoin() external view returns (ISystemCoin _systemCoin);

latestSurplusTransferTime

Timestamp of the last time that surplus funds were transferred

function latestSurplusTransferTime() external view returns (uint256 _latestSurplusTransferTime);

pulledPerHour

Amount of internal coins a given account has pulled from the treasury in a given block hour

function pulledPerHour(address _account, uint256 _blockHour) external view returns (uint256 _pulledPerHour);

Parameters

NameTypeDescription
_accountaddressThe account to query
_blockHouruint256The block hour to query

Returns

NameTypeDescription
_pulledPerHouruint256Amount of coins pulled from the treasury by the account in the given block hour [rad]

params

Getter for the contract parameters struct

function params() external view returns (StabilityFeeTreasuryParams memory _sfTreasuryParams);

Returns

NameTypeDescription
_sfTreasuryParamsStabilityFeeTreasuryParamsStabilityFee parameters struct

_params

Getter for the unpacked contract parameters struct

function _params()
  external
  view
  returns (uint256 _treasuryCapacity, uint256 _pullFundsMinThreshold, uint256 _surplusTransferDelay);

Returns

NameTypeDescription
_treasuryCapacityuint256Maximum amount of internal coins that the treasury can hold [rad]
_pullFundsMinThresholduint256Minimum amount of internal coins that the treasury must hold in order to allow pulling funds [rad]
_surplusTransferDelayuint256Minimum amount of time that must pass between surplus transfers [seconds]

Events

SetTotalAllowance

Emitted when an account's total allowance is modified

event SetTotalAllowance(address indexed _account, uint256 _rad);

Parameters

NameTypeDescription
_accountaddressThe account whose allowance was modified
_raduint256The new total allowance [rad]

SetPerHourAllowance

Emitted when an account's per hour allowance is modified

event SetPerHourAllowance(address indexed _account, uint256 _rad);

Parameters

NameTypeDescription
_accountaddressThe account whose allowance was modified
_raduint256The new per hour allowance [rad]

GiveFunds

Emitted when governance gives funds to an account

event GiveFunds(address indexed _account, uint256 _rad);

Parameters

NameTypeDescription
_accountaddressThe account that received funds
_raduint256The amount of funds that were given [rad]

TakeFunds

Emitted when governance takes funds from an account

event TakeFunds(address indexed _account, uint256 _rad);

Parameters

NameTypeDescription
_accountaddressThe account from which the funds are taken
_raduint256The amount of funds that were taken [rad]

PullFunds

Emitted when an account pulls funds from the treasury

event PullFunds(address indexed _sender, address indexed _dstAccount, uint256 _rad);

Parameters

NameTypeDescription
_senderaddressThe account that triggered the pull
_dstAccountaddressThe account that received funds
_raduint256The amount of funds that were pulled [rad]

TransferSurplusFunds

Emitted when surplus funds are transferred to the extraSurplusReceiver

event TransferSurplusFunds(address _extraSurplusReceiver, uint256 _fundsToTransfer);

Parameters

NameTypeDescription
_extraSurplusReceiveraddressThe account that received the surplus funds
_fundsToTransferuint256The amount of funds that were transferred [rad]

JoinCoins

Emitted when ERC20 coins are joined into the system

event JoinCoins(uint256 _wad);

Parameters

NameTypeDescription
_waduint256The amount of ERC20 coins that were joined [wad]

SettleDebt

Emitted when treasury coins are used to settle debt

event SettleDebt(uint256 _rad);

Parameters

NameTypeDescription
_raduint256The amount of internal system coins and debt that were destroyed [rad]

Errors

SFTreasury_AccountCannotBeTreasury

Throws when trying to pull/give/take funds from/to the treasury itself

error SFTreasury_AccountCannotBeTreasury();

SFTreasury_OutstandingBadDebt

Throws when trying to transfer surplus funds without having settled all debt

error SFTreasury_OutstandingBadDebt();

SFTreasury_NotEnoughFunds

Throws when trying to transfer more funds than the treasury has

error SFTreasury_NotEnoughFunds();

SFTreasury_NotAllowed

Throws when trying to pull funds above the account's total allowance

error SFTreasury_NotAllowed();

SFTreasury_PerHourLimitExceeded

Throws when trying to pull funds above the account's per hour allowance

error SFTreasury_PerHourLimitExceeded();

SFTreasury_DstCannotBeAccounting

Throws when trying to pull funds to the accounting contract

error SFTreasury_DstCannotBeAccounting();

SFTreasury_NullTransferAmount

Throws when trying to transfer a null amount of funds

error SFTreasury_NullTransferAmount();

SFTreasury_BelowPullFundsMinThreshold

Throws when trying to pull funds while the coin balance is below the minimum threshold

error SFTreasury_BelowPullFundsMinThreshold();

SFTreasury_TransferCooldownNotPassed

Throws when trying to transfer surplus funds before the cooldown period has passed

error SFTreasury_TransferCooldownNotPassed();

SFTreasury_NotEnoughSurplus

Throws when trying to transfer surplus funds while the treasury is below capacity

error SFTreasury_NotEnoughSurplus();

Structs

StabilityFeeTreasuryParams

struct StabilityFeeTreasuryParams {
  uint256 treasuryCapacity;
  uint256 pullFundsMinThreshold;
  uint256 surplusTransferDelay;
}

Allowance

struct Allowance {
  uint256 total;
  uint256 perHour;
}

ISurplusAuctionHouse

Git Source

Inherits: IAuthorizable, IDisableable, IModifiable, ICommonSurplusAuctionHouse

Functions

params

Getter for the contract parameters struct

function params() external view returns (SurplusAuctionHouseParams memory _sahParams);

Returns

NameTypeDescription
_sahParamsSurplusAuctionHouseParamsAuction house parameters struct

_params

Getter for the unpacked contract parameters struct

function _params()
  external
  view
  returns (
    uint256 _bidIncrease,
    uint256 _bidDuration,
    uint256 _totalAuctionLength,
    address _bidReceiver,
    uint256 _recyclingPercentage
  );

Returns

NameTypeDescription
_bidIncreaseuint256Minimum bid increase compared to the last bid in order to take the new one in consideration [wad %]
_bidDurationuint256How long the auction lasts after a new bid is submitted [seconds]
_totalAuctionLengthuint256Total length of the auction [seconds]
_bidReceiveraddressReceiver of protocol tokens
_recyclingPercentageuint256Percentage of protocol tokens to recycle [wad %]

terminateAuctionPrematurely

Terminate an auction prematurely.

function terminateAuctionPrematurely(uint256 _id) external;

Parameters

NameTypeDescription
_iduint256ID of the auction to settle/terminate

Events

TerminateAuctionPrematurely

Emitted when an auction is prematurely terminated

event TerminateAuctionPrematurely(
  uint256 indexed _id, uint256 _blockTimestamp, address _highBidder, uint256 _raisedAmount
);

Parameters

NameTypeDescription
_iduint256Id of the auction
_blockTimestampuint256Time when the auction was terminated
_highBidderaddressWho won the auction
_raisedAmountuint256Amount of protocol tokens raised in the auction [rad]

Errors

SAH_NullProtTokenReceiver

Throws when trying to start an auction with non-zero recycling percentage and null bid receiver

error SAH_NullProtTokenReceiver();

Structs

SurplusAuctionHouseParams

struct SurplusAuctionHouseParams {
  uint256 bidIncrease;
  uint256 bidDuration;
  uint256 totalAuctionLength;
  address bidReceiver;
  uint256 recyclingPercentage;
}

ITaxCollector

Git Source

Inherits: IAuthorizable, IModifiable, IModifiablePerCollateral

Functions

params

Getter for the contract parameters struct

function params() external view returns (TaxCollectorParams memory _taxCollectorParams);

Returns

NameTypeDescription
_taxCollectorParamsTaxCollectorParamsTax collector parameters struct

_params

Getter for the unpacked contract parameters struct

function _params()
  external
  view
  returns (
    address _primaryTaxReceiver,
    uint256 _globalStabilityFee,
    uint256 _maxStabilityFeeRange,
    uint256 _maxSecondaryReceivers
  );

Returns

NameTypeDescription
_primaryTaxReceiveraddressPrimary tax receiver address
_globalStabilityFeeuint256Global stability fee [ray]
_maxStabilityFeeRangeuint256Max stability fee range [ray]
_maxSecondaryReceiversuint256Max number of secondary tax receivers

cParams

Getter for the collateral parameters struct

function cParams(bytes32 _cType) external view returns (TaxCollectorCollateralParams memory _taxCollectorCParams);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_taxCollectorCParamsTaxCollectorCollateralParamsTax collector collateral parameters struct

_cParams

Getter for the unpacked collateral parameters struct

function _cParams(bytes32 _cType) external view returns (uint256 _stabilityFee);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_stabilityFeeuint256Stability fee [ray]

cData

Getter for the collateral data struct

function cData(bytes32 _cType) external view returns (TaxCollectorCollateralData memory _taxCollectorCData);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_taxCollectorCDataTaxCollectorCollateralDataTax collector collateral data struct

_cData

Getter for the unpacked collateral data struct

function _cData(bytes32 _cType)
  external
  view
  returns (uint256 _nextStabilityFee, uint256 _updateTime, uint256 _secondaryReceiverAllotedTax);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type

Returns

NameTypeDescription
_nextStabilityFeeuint256Per second borrow rate to be applied at the next taxation [ray]
_updateTimeuint256When Stability Fee was last collected
_secondaryReceiverAllotedTaxuint256Percentage of SF that goes to other addresses apart from the primary receiver

secondaryTaxReceivers

Getter for the data about a specific secondary tax receiver

function secondaryTaxReceivers(
  bytes32 _cType,
  address _receiver
) external view returns (TaxReceiver memory _secondaryTaxReceiver);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_receiveraddressTax receiver address to check

Returns

NameTypeDescription
_secondaryTaxReceiverTaxReceiverTax receiver struct

_secondaryTaxReceivers

Getter for the unpacked data about a specific secondary tax receiver

function _secondaryTaxReceivers(
  bytes32 _cType,
  address _receiver
) external view returns (address _secondaryReceiver, bool _canTakeBackTax, uint256 _taxPercentage);

Parameters

NameTypeDescription
_cTypebytes32Bytes32 representation of the collateral type
_receiveraddressTax receiver address to check

Returns

NameTypeDescription
_secondaryReceiveraddressSecondary tax receiver address
_canTakeBackTaxboolWhether this receiver can accept a negative rate (taking SF from it)
_taxPercentageuint256Percentage of SF allocated to this receiver

safeEngine

Address of the SAFEEngine contract

function safeEngine() external view returns (ISAFEEngine _safeEngine);

collectedManyTax

Check if multiple collateral types are up to date with taxation

function collectedManyTax(uint256 _start, uint256 _end) external view returns (bool _ok);

Parameters

NameTypeDescription
_startuint256Index of the first collateral type to check
_enduint256Index of the last collateral type to check

Returns

NameTypeDescription
_okboolWhether all collateral types are up to date

taxManyOutcome

Check how much SF will be charged (to collateral types between indexes 'start' and 'end' in the collateralList) during the next taxation

function taxManyOutcome(uint256 _start, uint256 _end) external view returns (bool _ok, int256 _rad);

Parameters

NameTypeDescription
_startuint256Index in collateralList from which to start looping and calculating the tax outcome
_enduint256Index in collateralList at which we stop looping and calculating the tax outcome

Returns

NameTypeDescription
_okboolWhether the tax outcome can be computed
_radint256The total amount of SF that will be charged during the next taxation

taxSingleOutcome

Get how much SF will be distributed after taxing a specific collateral type

function taxSingleOutcome(bytes32 _cType) external view returns (uint256 _newlyAccumulatedRate, int256 _deltaRate);

Parameters

NameTypeDescription
_cTypebytes32Collateral type to compute the taxation outcome for

Returns

NameTypeDescription
_newlyAccumulatedRateuint256The newly accumulated rate
_deltaRateint256The delta between the new and the last accumulated rates