機器環境

• win10
• nodev8.9.4
• npm install -g truffle
• npm install -g ganache-cli

Github地址

效果

初始化專案

• mkdir eth-one-words
• cd eth-one-words
• truffle init
• npm init

編寫智慧合約

• contracts/BlogSystem.sol

pragma solidity ^0.4.4;

contract BlogSystem {

    // 每次點讚的獎勵
    uint256 public readPrice = 0.001
 
 ether;

    // 每次釋出句子的價格
    uint256 public publishPrice = 0.001 ether;

    // 合約擁有者的地址
    address owner;

    // 釋出句子事件
    event PublishArticle(address sender, string title);

    // 點贊句子事件
    event ReadArticle(address sender);

    // 存放每個作者的獎勵，用於提現
    mapping (address => uint) pendingWithdrawals;

    // 存放address到title的對映
 

    mapping (address => string) titleOf;

    // 存放title到address的對映
    mapping (string => address) authorAddress;


    // 函式裝飾器--合約擁有者許可權
    modifier onlyOwner() {
        require(owner == msg.sender);
        _;
    }

    // 合約建構函式
    function BlogSystem() {
        owner = msg.sender;
    }

    // 釋出句子函式
 

    function Publish(string _title) payable {
        require(msg.value >= publishPrice);

        // 存放句子與作者地址的對映
        authorAddress[_title] = msg.sender;
        titleOf[msg.sender] = _title;

        // 觸發釋出句子事件
        PublishArticle(msg.sender, _title);
    }

    // 點贊句子函式
    function Read(string _title) payable {
        require(msg.value >= readPrice);

        // 金句作者獲得獎勵
        address _author = authorAddress[_title];
        pendingWithdrawals[_author] += readPrice;

        // 觸發句子點贊事件
        ReadArticle(msg.sender);
    }


    // 檢視合約餘額
    function contractBalance() constant returns(uint) {
        return this.balance;
    }


    // 提現獎勵
    function withdraw() payable {
        uint amount = pendingWithdrawals[msg.sender];
        pendingWithdrawals[msg.sender] = 0;
        msg.sender.transfer(amount);
    }

    // 檢視作者累計獎勵
    function balanceOf(address user) constant returns(uint) {
        return pendingWithdrawals[user];
    }

    // 設定釋出金句價格
    function setPublishPrice(uint _publishPrice) onlyOwner {
        publishPrice = _publishPrice;
    }

    // 設定點贊金句獎勵
    function setReadPrice(uint _readPrice) onlyOwner {
        readPrice = _readPrice;
    }

}

編寫遷移指令碼

• migrations/2_deploy_contracts.js

var BlogSystem = artifacts.require('./BlogSystem');

module.exports = (deployer) => {
    deployer.deploy(BlogSystem);
}

配置truffle.js檔案

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // to customize your Truffle configuration!
  networks: {  
    development: {  
      host: "localhost",  
      port: 8545,  
      network_id: "*"  
    }  
  }  
};

啟動ganache-cli

• ganache-cli

遷移合約

• truffle migrate

啟動前端

• npm install && npm run dev

設定MetaMask

• 匯入ganache-cli生成的key
• 設定網路為localhost：8545