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// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "./interfaces/IPriceFeed.sol";

contract PriceFeed is IPriceFeed {
    int256 public answer;
    uint80 public roundId;
    string public override description = "PriceFeed";
    address public override aggregator;

    uint256 public decimals;

    address public gov;

    mapping (uint80 => int256) public answers;
    mapping (address => bool) public isAdmin;

    constructor() public {
        gov = msg.sender;
        isAdmin[msg.sender] = true;
    }

    function setAdmin(address _account, bool _isAdmin) public {
        require(msg.sender == gov, "PriceFeed: forbidden");
        isAdmin[_account] = _isAdmin;
    }

    function latestAnswer() public override view returns (int256) {
        return answer;
    }

    function latestRound() public override view returns (uint80) {
        return roundId;
    }

    function setLatestAnswer(int256 _answer) public {
        require(isAdmin[msg.sender], "PriceFeed: forbidden");
        roundId = roundId + 1;
        answer = _answer;
        answers[roundId] = _answer;
    }

    // returns roundId, answer, startedAt, updatedAt, answeredInRound
    function getRoundData(uint80 _roundId) public override view
        returns (uint80, int256, uint256, uint256, uint80)
    {
        return (_roundId, answers[_roundId], 0, 0, 0);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IPriceFeed {
    function description() external view returns (string memory);
    function aggregator() external view returns (address);
    function latestAnswer() external view returns (int256);
    function latestRound() external view returns (uint80);
    function getRoundData(uint80 roundId) external view returns (uint80, int256, uint256, uint256, uint80);
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 14
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"aggregator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"answer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"","type":"uint80"}],"name":"answers","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"description","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"_roundId","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"","type":"uint80"},{"internalType":"int256","name":"","type":"int256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint80","name":"","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gov","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isAdmin","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRound","outputs":[{"internalType":"uint80","name":"","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"roundId","outputs":[{"internalType":"uint80","name":"","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"},{"internalType":"bool","name":"_isAdmin","type":"bool"}],"name":"setAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"int256","name":"_answer","type":"int256"}],"name":"setLatestAnswer","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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