开源地址：https://github.com/MyCryptoHQ/eth-scan
智能合约：
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
/**
* @title An Ether or token balance scanner
* @author Maarten Zuidhoorn
* @author Luit Hollander
*/
contract BalanceScanner {
struct Result {
bool success;
bytes data;
}
/**
* @notice Get the Ether balance for all addresses specified
* @param addresses The addresses to get the Ether balance for
* @return results The Ether balance for all addresses in the same order as specified
*/
function etherBalances(address[] calldata addresses) external view returns (Result[] memory results) {
results = new Result[](addresses.length);
for (uint256 i = 0; i < addresses.length; i++) {
results[i] = Result(true, abi.encode(addresses[i].balance));
}
}
/**
* @notice Get the ERC-20 token balance of `token` for all addresses specified
* @dev This does not check if the `token` address specified is actually an ERC-20 token
* @param addresses The addresses to get the token balance for
* @param token The address of the ERC-20 token contract
* @return results The token balance for all addresses in the same order as specified
*/
function tokenBalances(address[] calldata addresses, address token) external view returns (Result[] memory results) {
results = new Result[](addresses.length);
for (uint256 i = 0; i < addresses.length; i++) {
bytes memory data = abi.encodeWithSignature("balanceOf(address)", addresses[i]);
results[i] = staticCall(token, data, 20000);
}
}
/**
* @notice Get the ERC-20 token balance from multiple contracts for a single owner
* @param owner The address of the token owner
* @param contracts The addresses of the ERC-20 token contracts
* @return results The token balances in the same order as the addresses specified
*/
function tokensBalance(address owner, address[] calldata contracts) external view returns (Result[] memory results) {
results = new Result[](contracts.length);
bytes memory data = abi.encodeWithSignature("balanceOf(address)", owner);
for (uint256 i = 0; i < contracts.length; i++) {
results[i] = staticCall(contracts[i], data, 20000);
}
}
/**
* @notice Call multiple contracts with the provided arbitrary data
* @param contracts The contracts to call
* @param data The data to call the contracts with
* @return results The raw result of the contract calls
*/
function call(address[] calldata contracts, bytes[] calldata data) external view returns (Result[] memory results) {
return call(contracts, data, gasleft());
}
/**
* @notice Call multiple contracts with the provided arbitrary data
* @param contracts The contracts to call
* @param data The data to call the contracts with
* @param gas The amount of gas to call the contracts with
* @return results The raw result of the contract calls
*/
function call(
address[] calldata contracts,
bytes[] calldata data,
uint256 gas
) public view returns (Result[] memory results) {
require(contracts.length == data.length, "Length must be equal");
results = new Result[](contracts.length);
for (uint256 i = 0; i < contracts.length; i++) {
results[i] = staticCall(contracts[i], data[i], gas);
}
}
/**
* @notice Static call a contract with the provided data
* @param target The address of the contract to call
* @param data The data to call the contract with
* @param gas The amount of gas to forward to the call
* @return result The result of the contract call
*/
function staticCall(
address target,
bytes memory data,
uint256 gas
) private view returns (Result memory) {
uint256 size = codeSize(target);
if (size > 0) {
(bool success, bytes memory result) = target.staticcall{ gas: gas }(data);
if (success) {
return Result(success, result);
}
}
return Result(false, "");
}
/**
* @notice Get code size of address
* @param _address The address to get code size from
* @return size Unsigned 256-bits integer
*/
function codeSize(address _address) private view returns (uint256 size) {
// solhint-disable-next-line no-inline-assembly
assembly {
size := extcodesize(_address)
}
}
}
测试例子
https://github.com/MyCryptoHQ/eth-scan/blob/master/tests/BalanceScanner.test.ts