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// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
import "../interfaces/IPriceFeed.sol";
import "../interfaces/IBandStdReference.sol";
import "../interfaces/IChainlinkAggregator.sol";
import "../dependencies/openzeppelin/contracts/SafeMath.sol";
/*
* PriceFeed for mainnet deployment, to be connected to Chainlink's live ETH:USD aggregator reference
* contract, and a wrapper contract bandOracle, which connects to BandMaster contract.
*
* The PriceFeed uses Chainlink as primary oracle, and Band as fallback. It contains logic for
* switching oracles based on oracle failures, timeouts, and conditions for returning to the primary
* Chainlink oracle.
*/
contract PriceFeed is IPriceFeed {
    using SafeMath for uint256;
    uint constant public DECIMAL_PRECISION = 1e18;
    IChainlinkAggregator public chainlinkOracle;  // Mainnet Chainlink aggregator
    IBandStdReference public bandOracle;  // Wrapper contract that calls the Band system
    string public bandBase;
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// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
  /**
   * @dev Returns the addition of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `+` operator.
   *
   * Requirements:
   * - Addition cannot overflow.
   */
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pragma solidity 0.7.6;
interface IBandStdReference {
    /// Returns the price data for the given base/quote pair. Revert if not available.
    function getReferenceData(string memory _base, string memory _quote)
        external
        view
        returns (uint256 rate, uint256 lastUpdatedBase, uint256 lastUpdatedRate);
}
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// SPDX-License-Identifier: MIT
// Code from https://github.com/smartcontractkit/chainlink/blob/master/evm-contracts/src/v0.6/interfaces/AggregatorV3Interface.sol
pragma solidity 0.7.6;
interface IChainlinkAggregator {
  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);
  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
  function latestRoundData()
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// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;
interface IPriceFeed {
    // --- Function ---
    function fetchPrice() external view returns (uint);
    function updatePrice() external returns (uint);
}
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{
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}
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[{"inputs":[{"internalType":"contract IChainlinkAggregator","name":"_chainlinkOracleAddress","type":"address"},{"internalType":"contract IBandStdReference","name":"_bandOracleAddress","type":"address"},{"internalType":"uint256","name":"_timeout","type":"uint256"},{"internalType":"string","name":"_bandBase","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"_lastGoodPrice","type":"uint256"}],"name":"LastGoodPriceUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"enum PriceFeed.Status","name":"newStatus","type":"uint8"}],"name":"PriceFeedStatusChanged","type":"event"},{"inputs":[],"name":"DECIMAL_PRECISION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_PRICE_DEVIATION_FROM_PREVIOUS_ROUND","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_PRICE_DIFFERENCE_BETWEEN_ORACLES","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TARGET_DIGITS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TIMEOUT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"bandBase","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"bandOracle","outputs":[{"internalType":"contract IBandStdReference","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"bandQuote","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"chainlinkOracle","outputs":[{"internalType":"contract IChainlinkAggregator","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fetchPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastGoodPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"status","outputs":[{"internalType":"enum PriceFeed.Status","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"updatePrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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