withdraw() 中的调用函数返回 false，并且其下面的 require 语句记录“转账失败”。我问过 ChatGPT，它说“检查你的 Gas 限制”。（我这个合约的 Gas 限制是 3000000）。我不知道如何解决这个错误。
智能合约
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
contract Thrive {
error InvalidDeadline(string message);
enum campaignStatus {
OPEN,
CLOSED
}
struct Campaign {
address payable owner;
string title;
string description;
uint256 opening;
uint256 deadline;
uint256 amountCollected;
string image;
campaignStatus status;
address[] donators;
uint256[] donations;
}
event Action (uint256 id, string actionType, address executor, uint256 timestamp);
mapping(uint256 => Campaign) public campaigns;
uint256 public numberOfCampaigns = 0;
function createCampaign(address _owner, string memory _title, string memory _description, uint256 _deadline, string memory _image) public returns (uint256) {
Campaign storage campaign = campaigns[numberOfCampaigns];
// require(campaign.deadline > block.timestamp, "The deadline should be a date in the future.");
if(_deadline < block.timestamp) {
campaign.status = campaignStatus.CLOSED;
revert InvalidDeadline("The deadline should be a date in the future");
}
campaign.owner = payable(_owner);
campaign.title = _title;
campaign.description = _description;
campaign.opening = block.timestamp;
campaign.deadline = _deadline;
campaign.amountCollected = 0;
campaign.image = _image;
campaign.status = campaignStatus.OPEN;
numberOfCampaigns++;
emit Action (numberOfCampaigns - 1, "Campaign created", _owner, block.timestamp);
return numberOfCampaigns - 1;
}
function donateToCampaign(uint256 _id) public payable {
Campaign storage campaign = campaigns[_id];
require(campaign.status == campaignStatus.OPEN, "The campaign is closed");
uint256 amount = msg.value;
campaign.donators.push(msg.sender);
campaign.donations.push(amount);
(bool sent,) = payable(campaign.owner).call{value: amount}("");
require(sent, "transaction failed");
if(sent) {
campaign.amountCollected = campaign.amountCollected + amount;
}
emit Action (_id, "Fund donated to campaign", msg.sender, block.timestamp);
}
function withdraw(uint256 _id) public {
Campaign storage campaign = campaigns[_id];
require(campaign.status == campaignStatus.OPEN, "The campaign is closed");
require(msg.sender == campaign.owner, "Withdrawer should be the owner of the campaign");
require(campaign.amountCollected > 0, "Not enough fund generated");
uint256 amount = campaign.amountCollected;
require(amount > 0, "Amount not collected yet");
(bool success, ) = payable(campaign.owner).call{value: amount}("");
require(success, "Transfer failed");
campaign.amountCollected = 0;
campaign.status = campaignStatus.CLOSED;
emit Action (_id, "Fund withdrawed", msg.sender, block.timestamp);
}
function getDonators(uint256 _id) view public returns (address[] memory, uint256[] memory) {
return (campaigns[_id].donators, campaigns[_id].donations);
}
function getCampaigns() public view returns (Campaign[] memory) {
Campaign[] memory allCampaigns = new Campaign[](numberOfCampaigns);
for(uint i = 0; i < numberOfCampaigns; i++) {
Campaign storage item = campaigns[i];
allCampaigns[i] = item;
}
return allCampaigns;
}
function deleteCampaign(uint256 _id) public returns (uint256) {
Campaign storage campaign = campaigns[_id];
require(campaign.status == campaignStatus.CLOSED, "The campaign is open");
campaign.owner = payable(address(0));
campaign.title = "";
campaign.description = "";
campaign.opening = 0;
campaign.deadline = 0;
campaign.amountCollected = 0;
campaign.image = "";
numberOfCampaigns--;
emit Action (_id, "Campaign deleted", msg.sender, block.timestamp);
return numberOfCampaigns;
}
function getOwner() public view returns (address) {
return address(this);
}
function getCampaignOwner(uint256 _id) public view returns (address) {
return campaigns[_id].owner;
}
function getAmountCollected(uint256 _id) public view returns (uint256) {
return campaigns[_id].amountCollected;
}
}
错误：
status 0x0 Transaction mined but execution failed
transaction hash 0xe3e3e02272ee5393d3d7d48e94972a83fee50b37d0d3f58283b3ece5507cf838
block hash 0x2ac76a4b78da8572c51720eb198912d60d00b27b537d7145424ab679f51f8965
block number 198
from 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to Thrive.withdraw(uint256) 0x45373635641f5C51bf1029FdF2A225674D61AD45
gas 3000000 gas
transaction cost 35923 gas
execution cost 14731 gas
input 0x2e1...00000
decoded input {
"uint256 _id": "0"
}
decoded output {}
logs []
transact to Thrive.withdraw errored: Error occurred: revert.
revert
The transaction has been reverted to the initial state.
Reason provided by the contract: "Transfer failed".
You may want to cautiously increase the gas limit if the transaction went out of gas.
我尝试从特定活动中撤回以太币，并期望它能够正常工作，因为所有 require 语句都在调用函数之上传递。但交易失败并恢复到之前的状态。
您提供的代码正在
donateToCampaign下面的代码删除了
donateToCampaign function donateToCampaign(uint256 _id) public payable {
Campaign storage campaign = campaigns[_id];
require(campaign.status == campaignStatus.OPEN, "The campaign is closed");
uint256 amount = msg.value;
campaign.donators.push(msg.sender);
campaign.donations.push(amount);
campaign.amountCollected = campaign.amountCollected + amount;
emit Action (_id, "Fund donated to campaign", msg.sender, block.timestamp);
}
加上提现功能也受到重入攻击的污染，必须在转账操作之前设置合约的状态，这里是固定的提现功能：
function withdraw(uint256 _id) public {
Campaign storage campaign = campaigns[_id];
require(campaign.status == campaignStatus.OPEN, "The campaign is closed");
require(msg.sender == campaign.owner, "Withdrawer should be the owner of the campaign");
require(campaign.amountCollected > 0, "Not enough fund generated");
uint256 amount = campaign.amountCollected;
require(amount > 0, "Amount not collected yet");
campaign.amountCollected = 0;
campaign.status = campaignStatus.CLOSED;
(bool success, ) = payable(campaign.owner).call{value: amount}("");
require(success, "Transfer failed");
emit Action (_id, "Fund withdrawed", msg.sender, block.timestamp);
}