ChainlinkAdapter

A contract implementing PushAdapter that integrates with chainlink price feeds.

In previous versions, AspisLiquidityCalculatorV2 directly interacted with chainlink price feeds, we have separated the chainlink-specific logic into this dedicated adapter.

Configuring Token Price Feeds:

Each token must be configured with a DataFeed object:

     struct DataFeed {
         address priceFeedAddress;
         uint8 baseDecimals;
         uint8 quoteDecimals;
     }

The quoteDecimals represents the token’s decimal places, baseDecimals represents decimals of chainlink price feed. priceFeedAddress is the address of the chainlink price feed for the token.

To configure a DataFeed for a token we use updatePriceFeeds function (limited to Guardian)

    function updatePriceFeeds(
    address[] calldata _tokens,
    DataFeed[] calldata _dataFeeds) external onlyGuardian {}

• _tokens: ERC-20 token addresses
• _dataFeeds: An array of DataFeed objects that correspond to each token

The function iterates through all tokens and updates tokenToPriceFeed mappings then calls _verifyPriceFeed to verify validity of the provided price feed:

1. The price feed address must not be zero
2. Calling decimals on price feed must return baseDecimals

The function emits an event to notify off-chain services of the updates:

    event PriceFeedUpdated(address token, address _priceFeed);

You can also use removePriceFeeds to delete a token’s assigned DataFeed:

function removePriceFeeds(address[] calldata _tokens) external onlyGuardian {}

Fetching the price of a token in USD:

The getPrice function retrieves a token’s price given a chainlink price feed address: