智能合約經典代碼實戰——眾籌合約

通過學習,自己模擬仿寫了一個眾籌的智能合約代碼。內容還不夠完善,只完成了投資和取款操作。

//SPDX-License-Identifier: SimPL-2.0pragma solidity >=0.7.0 <0.8.9;contract zhongchou{    //投資者投資記錄:投資目標,投資金額    struct toMoney{        address payable addressReceiptor;        uint money;    }    //投資者基本信息:地址,是否被激活,總投資金額,投資次數,映射記錄投資記錄    struct funder{        address payable addressfunder;        bool isActive;        uint totalMoney;        uint numberGive;        mapping(uint=>toMoney)expMap;    }    //眾籌合約:合約創建者,是否被激活,金額總需求,已投資金額,投資人數量,映射記錄投資人    struct needMoneyContract{        address payable addressNeeder;        // payable address addressContract;        bool isActive;        uint totalMoney;        uint giveMoney;        uint amountFunder;        mapping (uint=>funder)mapFunder;    }    //眾籌發起者:地址,激活狀態,需求總金額,已經被投資的金額,發起的眾籌的數量,映射記錄投資合約    struct needer{        address addressNeeder;        bool isActive;        uint amountMoneyNeed;        uint amountHasFunded;        uint numberContract;        mapping(uint=>needMoneyContract)expMap;    }    //記錄眾籌合約總數,合約地址(資金池地址)    uint amountContract;    address payable public addressFinance;     //三方數組    mapping(address=>funder)funderMap;    mapping(uint=>needMoneyContract)contractMap;    mapping(address=>needer)neederMap;        constructor(){        addressFinance=payable(msg.sender);    }    //創建一個眾籌發起者    function createNeeder()public returns(bool){        //需要判定是否已經被激活        if(neederMap[msg.sender].isActive){            return false;        }        else{            address _addressNeeder=msg.sender;            //0.8.0后不允許直接創建一個包含映射的結構體。需要通過引用的方式,先創建一個storage類型的結構體(與目標是引用關系),再對新變量進行操作即可。            needer storage tmp1=neederMap[_addressNeeder];            tmp1.addressNeeder=_addressNeeder;            tmp1.isActive=true;            tmp1.amountMoneyNeed=0;            tmp1.amountHasFunded=0;            tmp1.numberContract=0;            return true;        }    }        function createContract(        uint _amountMoneyNeed    )public returns(bool){        address _addressNeeder=msg.sender;        uint tmpNum=amountContract++;        needMoneyContract storage tmp2=contractMap[tmpNum];        tmp2.addressNeeder=payable(_addressNeeder);        tmp2.isActive=true;        tmp2.totalMoney=_amountMoneyNeed;        tmp2.giveMoney=0;        tmp2.amountFunder=0;        uint tmpContract=neederMap[_addressNeeder].numberContract++;        neederMap[_addressNeeder].amountMoneyNeed+=_amountMoneyNeed;        needMoneyContract storage tmp3=neederMap[_addressNeeder].expMap[tmpContract];        needMoneyContract storage tmp4=contractMap[tmpNum];        tmp3=tmp4;        return true;    }        function createFunder()public returns(bool){        if(funderMap[msg.sender].isActive){            return false;        }        else{            address _address=msg.sender;            funder storage tmpfund=funderMap[_address];            tmpfund.addressfunder=payable(_address);            tmpfund.isActive=true;            tmpfund.totalMoney=0;            tmpfund.numberGive=0;            return true;        }    }        function donateMoney(        uint money,        uint idContract,        address addressNeeder    ) public payable returns(bool){        require(contractMap[idContract].isActive==true);        require(money==msg.value);        require(contractMap[idContract].addressNeeder==addressNeeder);        // payable address adressDonate=msg.sender;        address tmpfunder=msg.sender;        funderMap[tmpfunder].totalMoney+=money;        toMoney storage tmpMoney=funderMap[tmpfunder].expMap[funderMap[tmpfunder].numberGive];        tmpMoney.addressReceiptor=payable(addressNeeder);        tmpMoney.money=money;        funderMap[tmpfunder].numberGive++;        contractMap[idContract].giveMoney+=money;        funder storage tmpfund1=contractMap[idContract].mapFunder[contractMap[idContract].amountFunder++];        funder storage tmpfund2=funderMap[tmpfunder];        tmpfund1=tmpfund2;        return true;    }        function isComplete(uint idContract)public payable returns(bool){        require(contractMap[idContract].isActive==true);        require(contractMap[idContract].addressNeeder==msg.sender);        require(contractMap[idContract].totalMoney<=contractMap[idContract].giveMoney);        needMoneyContract storage tmptrans=contractMap[idContract];        tmptrans.isActive=false;        address tmpaddr=msg.sender;        uint getMoney=tmptrans.giveMoney;        neederMap[tmpaddr].amountHasFunded+=getMoney;        tmptrans.addressNeeder.transfer(getMoney);        return true;    }}