wstETHPriceProvider

Overview

License: MIT

contract wstETHPriceProvider is PriceProvider, Initializable, AccessControlUpgradeable

Price provider that uses chainlink

This contract is used to get the price of wstETH in USD.

Events info

SetTokenAndAggregator

event SetTokenAndAggregator(address indexed token, address[] aggregatorPath)

Emitted when the wstETH address and aggregator path are set.

Parameters:

Name
Type
Description

token

address

The address of the wstETH token contract.

aggregatorPath

address[]

The array of aggregator addresses to get the price feed for wstETH in USD.

SetTimeOut

event SetTimeOut(address indexed aggregatorPath, uint256 newTimeOut)

Emitted when the time out for a Chainlink aggregator path is set.

Parameters:

Name
Type
Description

aggregatorPath

address

The address of the Chainlink aggregator path.

newTimeOut

uint256

The new time out value in seconds.

Constants info

MODERATOR_ROLE (0x797669c9)

bytes32 constant MODERATOR_ROLE = keccak256("MODERATOR_ROLE")

DESCRIPTION (0xf1ae8856)

string constant DESCRIPTION = "Price provider that uses chainlink"

MAX_PRICE_PATH_LENGTH (0x01a9a5d3)

uint8 constant MAX_PRICE_PATH_LENGTH = 5

State variables info

tokenDecimals (0x3b97e856)

uint8 tokenDecimals

wstETH (0x4aa07e64)

address wstETH

aggregatorPath (0x004645ff)

address[] aggregatorPath

timeOuts (0x2a6377a9)

mapping(address => uint256) timeOuts

Modifiers info

onlyModerator

modifier onlyModerator()

Modifier to restrict access to functions to only the moderator role. The caller must have the moderator role to execute the function.

Functions info

initialize (0x946d9204)

function initialize(
    address _wstETH,
    address[] memory _aggregatorPath
) public initializer

Initializes the wstETH price provider contract with the given wstETH address and aggregator path.

Parameters:

Name
Type
Description

_wstETH

address

The address of the wstETH token contract.

_aggregatorPath

address[]

The array of aggregator addresses to get the price feed for wstETH in USD.

addAggregatorPath (0xbe04eba7)

function addAggregatorPath(
    address[] memory _aggregatorPath
) public onlyModerator

Adds a new aggregator path for the price oracle.

Requirements:

  • Only the moderator can call this function.

  • The length of the aggregator path must not exceed MAX_PRICE_PATH_LENGTH.

Parameters:

Name
Type
Description

_aggregatorPath

address[]

The new aggregator path to be added.

setTimeOut (0x60c74154)

function setTimeOut(
    address aggregatorPath_,
    uint256 newTimeOut
) external onlyModerator

Sets the timeout value corresponding to the aggregatorPath.

Example: ETH/USD have a new answer is written when the off-chain data moves more than the 0.5% deviation threshold or 3600 seconds have passed since the last answer was written on-chain. So, the timeOut value for each aggregator will be equal to the heartbeat threshold value plus a period of time to make the transaction update the price, that time period can be 60s or a little more.

Parameters:

Name
Type
Description

aggregatorPath_

address

The address of chainlink aggregator contract.

newTimeOut

uint256

It is the amount of time it takes for a new round of aggregation to start after a specified

amount of time since the last update plus a period of time waiting for new price update transactions to execute.

isActive (0x9f8a13d7)

function isActive(address token) public view override returns (bool)

Checks if the given token is active.

Parameters:

Name
Type
Description

token

address

The address of the token to check.

Return values:

Name
Type
Description

[0]

bool

A boolean indicating whether the token is active or not.

getPriceSTETH (0xcd78d6d4)

function getPriceSTETH() public view returns (uint256 priceMantissa)

Returns the price of stETH in USD.

Return values:

Name
Type
Description

priceMantissa

uint256

The price of stETH in USD as a mantissa value.

getPrice (0x41976e09)

function getPrice(
    address token
) public view override returns (uint256 priceMantissa, uint8 priceDecimals)

Returns the price of the given token in USD.

Parameters:

Name
Type
Description

token

address

The address of the token to get the price for.

Return values:

Name
Type
Description

priceMantissa

uint256

The price of the token in USD, scaled by 1e18.

priceDecimals

uint8

The number of decimals in the USD price.

getPriceDecimals (0x1b30aafc)

function getPriceDecimals() public view override returns (uint8)

Returns the number of decimals used for the USD price.

Return values:

Name
Type
Description

[0]

uint8

The number of decimals used for the USD price.

getLatestPrice (0x16345f18)

function getLatestPrice(
    address aggregatorPath_
) public view virtual returns (uint256)

Returns the latest price after performing sanity check and staleness check.

Parameters:

Name
Type
Description

aggregatorPath_

address

The address of chainlink aggregator contract.

Return values:

Name
Type
Description

[0]

uint256

The latest price (answer).

Last updated