WstEthOracleMiddlewareWithPyth

This contract is used to get the price of wstETH from the ETH price oracle.

State Variables

_wstEth

The wstETH contract.

IWstETH internal immutable _wstEth;

Functions

constructor

constructor(
    address pythContract,
    bytes32 pythPriceID,
    address chainlinkPriceFeed,
    address wstETH,
    uint256 chainlinkTimeElapsedLimit
) OracleMiddlewareWithPyth(pythContract, pythPriceID, chainlinkPriceFeed, chainlinkTimeElapsedLimit);

Parameters

Name	Type	Description
`pythContract`	`address`	The address of the Pyth contract.
`pythPriceID`	`bytes32`	The ID of the ETH Pyth price feed.
`chainlinkPriceFeed`	`address`	The address of the ETH Chainlink price feed.
`wstETH`	`address`	The address of the wstETH contract.
`chainlinkTimeElapsedLimit`	`uint256`	The duration after which a Chainlink price is considered stale.

parseAndValidatePrice

Parses and validates data, returns the corresponding price data by applying ETH/wstETH ratio.

The data format is specific to the middleware and is simply forwarded from the user transaction's calldata. Wsteth price is calculated as follows: ethPrice x stEthPerToken / 1 ether. A fee amounting to exactly {validationCost} (with the same data and action) must be sent or the transaction will revert.

function parseAndValidatePrice(
    bytes32 actionId,
    uint128 targetTimestamp,
    Types.ProtocolAction action,
    bytes calldata data
) public payable virtual override(IBaseOracleMiddleware, CommonOracleMiddleware) returns (PriceInfo memory);

Parameters

Name	Type	Description
`actionId`	`bytes32`	A unique identifier for the current action. This identifier can be used to link an `Initiate` call with the corresponding `Validate` call.
`targetTimestamp`	`uint128`	The target timestamp for validating the price data. For validation actions, this is the timestamp of the initiation.
`action`	`Types.ProtocolAction`	Type of action for which the price is requested. The middleware may use this to alter the validation of the price or the returned price.
`data`	`bytes`	The data to be used to communicate with oracles, the format varies from middleware to middleware and can be different depending on the action.

Returns

Name	Type	Description
`<none>`	`PriceInfo`	result_ The price and timestamp as PriceInfo.