// SPDX-License-Identifier: BUSL-1.1
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

import { IPriceOracleV2Exceptions } from "../interfaces/IPriceOracle.sol";

/// @title Sanity checker for Chainlink price feed results
contract PriceFeedChecker is IPriceOracleV2Exceptions {
    function _checkAnswer(
        uint80 roundID,
        int256 price,
        uint256 updatedAt,
        uint80 answeredInRound
    ) internal pure {
        if (price <= 0) revert ZeroPriceException(); // F:[PO-5]
        if (answeredInRound < roundID || updatedAt == 0)
            revert ChainPriceStaleException(); // F:[PO-5]
    }
}