目录
这是一个超超超级简单的智能合约提案项目,你确定不点进来看一下吗?
引言:
1、搭建开发环境:
2、编写智能合约:
3、部署智能合约:
编辑编辑4、编写前端交互代码(使用web3.js):
5、设计关于提案平台的html:
这是一个超超超级简单的智能合约提案项目,你确定不点进来看一下吗?
引言:
作为一个“新手”写智能合约,我选择做提案项目的目的是学习和成长。在这个项目中,我计划使用Solidity编程语言来编写智能合约,并进行部署和测试。我将设计一个简单而有趣的提案系统,允许用户提交提案并进行投票。我将利用前端技术,如HTML、CSS和JavaScript,来开发一个直观且易于使用的界面。通过这个项目,我希望能够提高我的编程能力和设计技巧。
1、搭建开发环境:
1.安装并配置必要的开发工具,如Node.js、Truffle Suite或Hardhat等。
2.部署一个本地的以太坊测试网络(如Ganache,Geth)或连接到以太坊的公共测试网络(如Ropsten)。
3.使用Remix,Remix是一个在线的Solidity IDE,其提供了Solidity编译器、调试器和运行环境。
4.MetaMask 是一种加密货币钱包,使用户能够访问分散式应用程序(dapps)的 Web 3 生态系统。
简单来说:
-
MetaMask 是一种加密货币钱包,使用户能够存储以太币和其他 ERC-20 代币。
-
钱包还可用于与去中心化应用程序或 dapp 进行交互
2、编写智能合约:
编写提案智能合约及实现一个基于 ERC20 标准的代币合约。
定义合约的数据结构、状态变量、函数以及相关的事件。
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;import"@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract MyToken1 is ERC20 {constructor(string memory name, string memory symbol) ERC20(name, symbol) {_mint(msg.sender, 111 * 10**uint(decimals()));}function getDEcimals() public view returns (uint){return decimals();}}
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;import"@openzeppelin/contracts/token/ERC20/ERC20.sol";contract EthVoting {//附议人信息struct Voter {uint voteTimeStamp; //投票时的区块时间uint voterMoney;bool initialized; //判断是否投过票的标志}//提案内容struct Proposal {string pName; //提案标题string pCtx; //提案内容address chairperson; //提案主持人uint voteCount; //附议人数bool initialized; //判断提案是否存在的标志uint limitTime; //附议限制时间uint money; //该提案的已经募集到的金额uint r_money;//该提案目标募集的金额mapping(address => Voter) voters; //附议列表} //提案内容-加入的数组中struct Proposal_group {string pName; //提案标题string pCtx; //提案内容address chairperson; //提案主持人uint voteCount; //附议人数bool initialized; //判断提案是否存在的标志uint limitTime; //附议限制时间uint money; //该提案的已经募集到的金额uint r_money;//该提案目标募集的金额}//声明一个全局变量成为部署当前合约的调用者
address public master;//声明一个全局变量成为master指定一个账户成为提案合法提取者
address receiver;//ERC20的合约地址赋值给这个变量address public ercaddress;constructor (address ercaddress_ ) {//实例化合约token合约对象master=msg.sender;//实例化一个tokenercaddress =ercaddress_;}//转ERC20代币function transfer2other(address to_ ,uint ercnum_) public {IERC20(ercaddress).transfer(to_,ercnum_*(10**18));}//获取某个ERC20代币余额function getBalance() public view returns (uint256) {return IERC20(ercaddress).balanceOf(address(this));}//提案编号
uint pId;//函数修饰符,表示只有master账户才能执行的函数
modifier onlyMaster(){require(msg.sender==master,"it must be master");_;} //函数修饰符,表示只有指定账户才能提取提案里的钱
modifier onlyReceiver(){require(msg.sender==receivers[msg.sender]&&msg.sender==receivers[msg.sender]&&msg.sender==receivers[msg.sender],"it must be receiver");_;}//函数修饰符,表示只有指定账户才能进行提案的附议
modifier onlySomeDoVoting(){
require(msg.sender!=receiver,"it can not be receiver");
require(msg.sender!=master,"it can not be master");_;
}//所有提案列表mapping(uint => Proposal) public proposals;//提案余额提取者mapping(address=>address) public receivers;//所有提案列表-加入到数组中mapping(uint => Proposal_group) public proposales;
//所有提案列表-加入到数组中mapping(uint=>Proposal_group[]) public Proposal_groups;//附议事件event VoteEvt(string indexed eventType, address _voter, uint timestamp);//提案事件event ProposeEvt(string indexed eventType, uint _proposalId, uint _limitTime);//创建新提案function createProposal(string memory _pName, string memory _pCtx, uint _limitTime ,uint r_money) public payable returns (uint){//赋值语句pId=pId+1;Proposal storage _proposal = proposals[pId];_proposal.pName = _pName;_proposal.pCtx = _pCtx;_proposal.chairperson = msg.sender;_proposal.initialized = true;_proposal.limitTime=block.timestamp+ _limitTime;_proposal.r_money= r_money;_proposal.voteCount = 0;//赋值并加入到数组中,以获取所有的提案Proposal_group storage _proposales = proposales[pId];_proposales.pName = _pName;_proposales.pCtx = _pCtx;_proposales.chairperson = msg.sender;_proposales.initialized = true;_proposales.limitTime=block.timestamp+ _limitTime;_proposales.r_money= r_money;_proposales.voteCount = 0;Proposal_groups[1].push(_proposales);emit ProposeEvt("propose", pId, _limitTime);return pId;}//提案提取人数量uint receiverCount;//master添加提案提取人function addReceiver(address voterAddr) public payable onlyMaster{require(receiverCount<=3,"receiver can not exceed 3!");receiverCount+=1;receivers[voterAddr]=voterAddr;}//master删除提案提取人function deleteReceiver(address voterAddr) public payable onlyMaster{delete receivers[voterAddr];receiverCount-=1;}//进行附议function doVoting(uint pId1) public payable {if (proposals[pId1].chairperson == msg.sender)revert("proposal person is not youself");if (msg.value <2)revert("money is lower than 2");//提案是否存在if (proposals[pId1].initialized == false)revert("proposal not exist");uint currentTime = block.timestamp;//是否已超过提案时限if (proposals[pId1].limitTime < currentTime)revert("exceed voting time");//是否已经投过票if (proposals[pId1].voters[msg.sender].initialized == true)revert("already vote");if (proposals[pId1].money>=proposals[pId1].r_money)revert("money is enough!");//新投票信息Voter memory voter = Voter({voteTimeStamp: block.timestamp,initialized: true,voterMoney:msg.value});//记录投票信息proposals[pId1].voters[msg.sender] = voter;proposals[pId1].voteCount+=1;proposals[pId1].money+=msg.value;emit VoteEvt("vote", msg.sender, block.timestamp);} //提案里的钱由合法提取者提取出来function collectMoney(uint pId1) public payable onlyReceiver{
payable(receiver).transfer(proposals[pId1].money);proposals[pId1].money=0;delete proposals[pId1];}//查询是否附议function queryVoting(uint pId1, address voterAddr) public view returns (uint,uint){//提案是否存在if (proposals[pId1].initialized == false)revert("proposal not exist");//返回投票时间和和金额return (proposals[pId1].voters[voterAddr].voteTimeStamp,proposals[pId1].voters[voterAddr].voterMoney);} //获取区块链时间function getBlockTime() public view returns (uint t) { t = block.timestamp;}// //查询所有提案function getProposals() public view returns (Proposal_group[] memory) { return Proposal_groups[1];} // 查询附议提案function queryP_dovot(uint pid) public view returns (uint,uint ) { return (proposals[pid].voteCount,proposals[pid].money);} //查询提案标题function getProposalName(uint pId1) public view returns (string memory s) { s = proposals[pId1].pName;} //查询提案内容function getProposalCtx(uint pId1) public view returns (string memory s) { s = proposals[pId1].pCtx;}//查询提案内容function getProposalVCnt(uint pId1) public view returns (uint v) { v = proposals[pId1].voteCount;}//查询提案期限function getProposalLimit(uint pId1) public view returns (uint t) { t = proposals[pId1].limitTime;}}
3、部署智能合约:
编译智能合约代码,生成合约的字节码和ABI(Application Binary Interface)。
将合约部署到所选择的以太坊网络中。
4、编写前端交互代码(使用web3.js):
创建一个前端应用程序,可以是基于HTML/CSS/JavaScript的简单界面。
使用web3.js库与部署的智能合约进行交互,包括调用合约方法、处理交易等。
配置MetaMask或其他以太坊钱包插件,使用户可以通过浏览器与智能合约交互并进行以太币交易。
具体功能见代码注释
const web3 = new Web3(Web3.givenProvider);
const abi = [];
let changeAccount = [];
var myContract = new web3.eth.Contract(abi,"0xa9dC761F2B9986Ce04694c3f279f0d62bb82A9CA"
);
let Accounts = [];
console.log(web3);
web3.eth.getAccounts().then(function (accounts) {Accounts = accounts;
});
ethereum.on("accountsChanged", function (account) {changeAccount = account;
});
function handle() {var Title = document.getElementById("Title").value;var content = document.getElementById("content").value;var time = document.getElementById("time").value;var eth = document.getElementById("eth").value;var start = new Date("1970-01-01");var end = new Date(time);var t_start = start.getTime();var t_end = end.getTime();var days = (t_end - t_start) / 1000 / 60 / 60 / 24; //10var s = days * 24 * 60 * 60;//添加提案myContract.methods._createProposal(Title, content, s, eth).send({ from: changeAccount[0], gas: 3000000 }).then(function (receipt) {alert("提案添加成功");});
}
//查询提案列表
function queryall() {myContract.methods._getProposals().call({ from: changeAccount[0] }).then(function (receipt) {console.log(receipt);});
}var personAdd = [];
//添加提案余额提取人
function handle1() {var Person = document.getElementById("Person").value;var Person1 = document.getElementById("Person1").value;console.log(Person == "");console.log(Person1 == "");if (Person != "") {personAdd[0] = Person;myContract.methods._addReceiver(personAdd[0]).send({ from: changeAccount[0], gas: 3000000 }).then(function (receipt) {alert("添加提案余额提取人成功");});}if (Person1 != "") {personAdd[0] = Person1;myContract.methods._deleteReceiver(personAdd[0]).send({ from: changeAccount[0], gas: 3000000 }).then(function (receipt) {alert("删除提案余额提取人成功");});}
}
//附议提案
function handle2() {var id = document.getElementById("id").value;var eth = document.getElementById("eth").value;web3.eth.getAccounts().then(function (accounts) {Accounts = accounts;});myContract.methods._doVoting(id).send({ from: changeAccount[0], gas: 3000000, value: eth }).then(function (receipt) {alert("提案附议成功");var amount = 10;myContract.methods._transfer2other(Accounts[0], amount).send({ from: changeAccount[0], gas: 3000000 }).then(function (receipt) {alert("附议成功,该账户获得10个ERC20代币");});});
}//receiver接收提案中的金额
function handle3() {web3.eth.getAccounts().then(function (accounts) {Accounts = accounts;});var id = document.getElementById("id").value;myContract.methods._collectMoney(id).send({ from: changeAccount[0], gas: 3000000 }).then(function (receipt) {alert("receiver提取成功");});
}
//查询提案附议结果
function handle4() {web3.eth.getAccounts().then(function (accounts) {Accounts = accounts;});var id = document.getElementById("id").value;var id1 = document.getElementById("id1").value;var Address = document.getElementById("Address").value;if (id != "") {myContract.methods._queryP_dovot(id).call({ from: changeAccount[0] }).then(function (receipt) {alert("查询成功");console.log(receipt);});}if (id1 != "") {//查询某人附议结果(pid,address)personAdd[0] = Address;myContract.methods._queryVoting(id1, personAdd[0]).call({ from: changeAccount[0] }).then(function (receipt) {alert("查询成功");console.log(receipt);});}
}
5、设计关于提案平台的html:
1、是的,HTML代码我没给全,比如设置提案接收人,提案附议页面,查询提案页面我都没给,看到这个文章的有缘人,你们要靠你们自己了!
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>首页</title><!--bootstrap css 挺方便简洁的一款第三方前端开发框架-->
<link rel="stylesheet" href="css/bootstrap.css" /><link rel="stylesheet" href="css/style.css" /></head>
<body><div class="span12 content" style="width: 1180px;"><div class="box" style=" margin-top: 166px;margin-left: 245px;"><div class="box-head"><h3>公告提案平台</h3><a href="/setReveiver.html"><button>设置提案接收人</button></a><a href="/dovot.html"><button>附议页面</button></a><a href="/searchPid.html"><button>查询提案</button></a><a href="/reveiver.html"><button>余额提取页面</button></a><button onclick="queryall()">查询提案列表(控制台查看)</button></div><div class="box-content"><div class="form-horizontal"><div class="control-group"><label class="control-label">标题</label><div class="controls"><div class="input-append"><input id="csyTitle" type="text" class="tip" /><!-- <span class="tip add-on" id="jieshouren"> --><!-- <i class="icon-user" style="cursor:pointer" ></i> --><!-- <div style="display:none" id="selectlxr"></div> --></span></div></div></div><div class="control-group"><label class="control-label">内容</label><div class="controls"><textarea id="csycontent" class="span6 input-square"></textarea></div></div><div class="control-group"><label class="control-label">截止时间</label><div class="controls"><input id="csytime" type="datetime-local" /></div></div><div class="control-group"><label class="control-label">所需费用</label><div class="controls"><input type="text" id="csyeth" class="tip" /></div></div><div class="control-group"><label class="control-label"> </label><div class="controls"><input type="button" class="btn btn-fo" onclick="handle()" value="新建提案" /></div></div></div></div></div>
</div>
<script src="web3.min.js"></script>
<script src="app1.js"></script>
<script src="js/jQuery.js"></script>
<script src="js/jquery.artDialog.js?skin=idialog"></script>
<!--js结束-->
<script>
//循环输出创建十个复选框
var chtml = "";
for (var i = 0; i < 10; i++) {chtml += "<div style='word-wrap:break-word; width:450px; '>";chtml += '<label style="float:left;padding:15px"><input type="checkbox" name="aaa" value="1" class="{required:true}" /><span style="margin-left:10px">小'+i+'</span></label>';chtml += "</div>";
}
//把得到字符串利用jquery添加到元素里面生成checkbox
$("#selectlxr").html(chtml);
//创建一个 dialog弹出框(第三方插件有兴趣可以看下 超赞的一款插件 http://www.planeart.cn/demo/artDialog/) 把创建好的弹出框隐藏起来
var dia = $.dialog({title: "选择联系人", width: "500px",content: $("#selectlxr").html(),close: function () {this.hide();return false;},follow: document.getElementById("jieshouren")}).hide();//点击 显示
$("#jieshouren").click(function () {dia.show();
})
//事件 获取checkbox点击时候的父元素的值 添加到text 如果点击收的选中状态为checked 则添加 否则 删除
$("input[type=checkbox]").click(function () {try {if ($(this).attr("checked")) {$("#jsrtxt").val($("#jsrtxt").val() + $(this).parent().text() + ";");} else {$("#jsrtxt").val($("#jsrtxt").val().replace($(this).parent().text() + ';', ""));}} catch (e) {$("#jsrtxt").val("");}
})
//初步测试 暂无小bug 可以为text增加一个只读
</script></body>
</html>