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