46 lines
1.7 KiB
Solidity
46 lines
1.7 KiB
Solidity
pragma solidity >=0.5.0;
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pragma experimental ABIEncoderV2;
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/// @title Multicall - Aggregate results from multiple read-only function calls
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/// @author Michael Elliot <mike@makerdao.com>
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/// @author Joshua Levine <joshua@makerdao.com>
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/// @author Nick Johnson <arachnid@notdot.net>
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contract Multicall {
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struct Call {
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address target;
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bytes callData;
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}
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function aggregate(Call[] memory calls) public returns (uint256 blockNumber, bytes[] memory returnData) {
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blockNumber = block.number;
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returnData = new bytes[](calls.length);
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for(uint256 i = 0; i < calls.length; i++) {
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(bool success, bytes memory ret) = calls[i].target.call(calls[i].callData);
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require(success);
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returnData[i] = ret;
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}
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}
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// Helper functions
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function getEthBalance(address addr) public view returns (uint256 balance) {
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balance = addr.balance;
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}
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function getBlockHash(uint256 blockNumber) public view returns (bytes32 blockHash) {
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blockHash = blockhash(blockNumber);
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}
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function getLastBlockHash() public view returns (bytes32 blockHash) {
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blockHash = blockhash(block.number - 1);
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}
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function getCurrentBlockTimestamp() public view returns (uint256 timestamp) {
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timestamp = block.timestamp;
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}
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function getCurrentBlockDifficulty() public view returns (uint256 difficulty) {
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difficulty = block.difficulty;
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}
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function getCurrentBlockGasLimit() public view returns (uint256 gaslimit) {
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gaslimit = block.gaslimit;
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}
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function getCurrentBlockCoinbase() public view returns (address coinbase) {
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coinbase = block.coinbase;
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}
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}
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