all files / plugins/assets/ OracleLib.sol

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// SPDX-License-Identifier: BlueOak-1.0.0
pragma solidity 0.8.17;
 
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "../../libraries/Fixed.sol";
 
error StalePrice();
 
/// Used by asset plugins to price their collateral
library OracleLib {
    /// @dev Use for on-the-fly calculations that should revert
    /// @param timeout The number of seconds after which oracle values should be considered stale
    /// @return {UoA/tok}
    function price(AggregatorV3Interface chainlinkFeed, uint48 timeout)
        internal
        view
        returns (uint192)
    {
        (uint80 roundId, int256 p, , uint256 updateTime, uint80 answeredInRound) = chainlinkFeed
            .latestRoundData();
 
        if (updateTime == 0 || answeredInRound < roundId) {
            revert StalePrice();
        }
        // Downcast is safe: uint256(-) reverts on underflow; block.timestamp assumed < 2^48
        uint48 secondsSince = uint48(block.timestamp - updateTime);
        if (secondsSince > timeout) revert StalePrice();
 
        // {UoA/tok}
        return shiftl_toFix(uint256(p), -int8(chainlinkFeed.decimals()));
    }
}