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// SPDX-License-Identifier: MIT
pragma solidity =0.7.6;
pragma abicoder v2;

/// @notice A fork of MultiCall with gas limit
contract InterfaceMulticallV2 {
    struct Call {
        address target;
        uint256 gasLimit;
        bytes callData;
    }

    struct Result {
        bool success;
        uint256 gasUsed;
        bytes returnData;
    }

    function multicall(Call[] memory calls) public returns (uint256 blockNumber, Result[] memory returnData) {
        blockNumber = block.number;
        returnData = new Result[](calls.length);

        for (uint256 i = 0; i < calls.length; i++) {
            (address target, uint256 gasLimit, bytes memory callData) = (
                calls[i].target,
                calls[i].gasLimit,
                calls[i].callData
            );

            uint256 gasLeftBefore = gasleft();
            (bool success, bytes memory ret) = target.call{gas: gasLimit}(callData);
            uint256 gasUsed = gasLeftBefore - gasleft();
            returnData[i] = Result(success, gasUsed, ret);
        }
    }

    function multicallWithGasLimitation(
        Call[] memory calls,
        uint256 gasBuffer
    ) public returns (uint256 blockNumber, Result[] memory returnData, uint256 lastSuccessIndex) {
        blockNumber = block.number;
        returnData = new Result[](calls.length);

        for (uint256 i = 0; i < calls.length; i++) {
            (address target, uint256 gasLimit, bytes memory callData) = (
                calls[i].target,
                calls[i].gasLimit,
                calls[i].callData
            );

            uint256 gasLeftBefore = gasleft();
            (bool success, bytes memory ret) = target.call{gas: gasLimit}(callData);
            uint256 gasUsed = gasLeftBefore - gasleft();
            returnData[i] = Result(success, gasUsed, ret);

            if (gasleft() < gasBuffer) {
                return (blockNumber, returnData, i);
            }
        }

        return (blockNumber, returnData, calls.length - 1);
    }

    function gaslimit() external view returns (uint256) {
        return block.gaslimit;
    }

    function gasLeft() external view returns (uint256) {
        return gasleft();
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 700
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[],"name":"gasLeft","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gaslimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"target","type":"address"},{"internalType":"uint256","name":"gasLimit","type":"uint256"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct InterfaceMulticallV2.Call[]","name":"calls","type":"tuple[]"}],"name":"multicall","outputs":[{"internalType":"uint256","name":"blockNumber","type":"uint256"},{"components":[{"internalType":"bool","name":"success","type":"bool"},{"internalType":"uint256","name":"gasUsed","type":"uint256"},{"internalType":"bytes","name":"returnData","type":"bytes"}],"internalType":"struct InterfaceMulticallV2.Result[]","name":"returnData","type":"tuple[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"target","type":"address"},{"internalType":"uint256","name":"gasLimit","type":"uint256"},{"internalType":"bytes","name":"callData","type":"bytes"}],"internalType":"struct InterfaceMulticallV2.Call[]","name":"calls","type":"tuple[]"},{"internalType":"uint256","name":"gasBuffer","type":"uint256"}],"name":"multicallWithGasLimitation","outputs":[{"internalType":"uint256","name":"blockNumber","type":"uint256"},{"components":[{"internalType":"bool","name":"success","type":"bool"},{"internalType":"uint256","name":"gasUsed","type":"uint256"},{"internalType":"bytes","name":"returnData","type":"bytes"}],"internalType":"struct InterfaceMulticallV2.Result[]","name":"returnData","type":"tuple[]"},{"internalType":"uint256","name":"lastSuccessIndex","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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