Contract

// Copyright 2021 Cartesi Pte. Ltd.

// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

pragma solidity ^0.8.0;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorInterface.sol";
import "./GasOracle.sol";

contract ChainlinkGasOracle is GasOracle {
    AggregatorInterface public immutable oracle;

    constructor(address _oracle) {
        oracle = AggregatorInterface(_oracle);
    }

    /// @notice Returns current network gas price
    /// @return value of gas price
    function getGasPrice() external view override returns (uint256) {
        // get gas price from chainlink oracle
        // https://data.chain.link/fast-gas-gwei
        return uint256(oracle.latestAnswer());
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface AggregatorInterface {
  function latestAnswer()
    external
    view
    returns (
      int256
    );
  
  function latestTimestamp()
    external
    view
    returns (
      uint256
    );

  function latestRound()
    external
    view
    returns (
      uint256
    );

  function getAnswer(
    uint256 roundId
  )
    external
    view
    returns (
      int256
    );

  function getTimestamp(
    uint256 roundId
  )
    external
    view
    returns (
      uint256
    );

  event AnswerUpdated(
    int256 indexed current,
    uint256 indexed roundId,
    uint256 updatedAt
  );

  event NewRound(
    uint256 indexed roundId,
    address indexed startedBy,
    uint256 startedAt
  );
}

// Copyright 2021 Cartesi Pte. Ltd.

// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

/// @title Interface staking contract
pragma solidity ^0.8.0;

interface GasOracle {
    /// @notice Returns current network gas price
    /// @return value of gas price
    function getGasPrice() external view returns (uint256);
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"address","name":"_oracle","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"getGasPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"oracle","outputs":[{"internalType":"contract AggregatorInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000169e633a2d1e6c10dd91238ba11c4a708dfef37c

-----Decoded View---------------
Arg [0] : _oracle (address): 0x169E633A2D1E6c10dD91238Ba11c4A708dfEF37C

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000169e633a2d1e6c10dd91238ba11c4a708dfef37c