DelayedOracle

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

Address of the non-delayed price source

Assumes that the price source is a valid IBaseOracle

IBaseOracle public priceSource;

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

string public symbol;

The delay in seconds that should elapse between updates

uint256 public updateDelay;

The timestamp of the last update

uint256 public lastUpdateTime;

The current valid price feed storage struct

Feed internal _currentFeed;

The next valid price feed storage struct

Feed internal _nextFeed;

constructor(IBaseOracle _priceSource, uint256 _updateDelay);

Parameters

Name	Type	Description
`_priceSource`	`IBaseOracle`	The address of the non-delayed price source
`_updateDelay`	`uint256`	The delay in seconds that should elapse between updates

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

Name	Type	Description
`_success`	`bool`	Whether the update was successful or not

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);

Fetch the latest oracle result

Will revert if is the price feed is invalid

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

Indicates if a delay has passed since the last update

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

Returns

Name	Type	Description
`_ok`	`bool`	Whether the oracle should be updated or not

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

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

Returns

Name	Type	Description
`_result`	`uint256`	The value in 18 decimals format of the next price feed
`_validity`	`bool`	Whether the next price feed is valid or not

Internal view function that queries the standard price source

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

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

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