pragma solidity >=0.5.0;
pragma experimental ABIEncoderV2;
/// @title Multicall - Aggregate results from multiple read-only function calls
/// @author Michael Elliot
/// @author Joshua Levine
/// @author Nick Johnson
/// @author Bogdan Dumitru
contract Multicall {
struct Call {
address target;
bytes callData;
}
struct Return {
bool success;
bytes data;
}
function aggregate(Call[] memory calls, bool strict) public returns (uint256 blockNumber, Return[] memory returnData) {
blockNumber = block.number;
returnData = new Return[](calls.length);
for(uint256 i = 0; i < calls.length; i++) {
(bool success, bytes memory ret) = calls[i].target.call(calls[i].callData);
if (strict) {
require(success);
}
returnData[i] = Return(success, 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;
}
}