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以太坊Truffle宠物商店开发

2021-10-22 21:03:41 作者：互联网

以太坊Truffle宠物商店开发

创建项目

建立项目目录并进入
mkdir pet-shop
使用truffle unbox 创建项目
truffle unbox pet-shop

添加宠物领养合约文件

cd contracts
touch Adoption.sol

pragma solidity ^0.5.0;
contract Adoption {
  address[16] public adopters;  // 保存领养者的地址
    // 领养宠物
  function adopt(uint petId) public returns (uint) {
    require(petId >= 0 && petId <= 15);  // 确保id在数组长度内
    adopters[petId] = msg.sender;        // 保存调用这地址
    return petId;
  }
  // 返回领养者
  function getAdopters() public view returns (address[16] memory) {
    return adopters;
  }
}

开启ganache-cli

输入命令：ganache-cli
记住12个单词的助记符，后续需要使用（每次新开启一个ganache客户端都会重新初始化助记符）。output parent when east clown cake duck garbage jump spin medal cute

修改配置文件

vim truffle-config.js

module.exports = {
  // See <http://truffleframework.com/docs/advanced/configuration>
  // for more about customizing your Truffle configuration!
  networks: {
    development: {
      host: "127.0.0.1",
      port: 8545, // ganache监视的端口
      network_id: "*" // Match any network id
    },
    develop: {
      port: 8545
    }
  }
};

编译部署智能合约

truffle console
truffle compile
truffle migrate

测试智能合约

在test目录下新建一个TestAdoption.sol

pragma solidity ^0.5.0;
import "truffle/Assert.sol";   // 引入的断言
import "truffle/DeployedAddresses.sol";  // 用来获取被测试合约的地址
import "../contracts/Adoption.sol";      // 被测试合约
contract TestAdoption {
  Adoption adoption = Adoption(DeployedAddresses.Adoption());
  // 领养测试用例
  function testUserCanAdoptPet() public {
    uint returnedId = adoption.adopt(8);
    uint expected = 8;
    Assert.equal(returnedId, expected, "Adoption of pet ID 8 should be recorded.");
  }
  // 宠物所有者测试用例
  function testGetAdopterAddressByPetId() public {
    // 期望领养者的地址就是本合约地址，因为交易是由测试合约发起交易，
    address expected = address(this);
    address adopter = adoption.adopters(8);
    Assert.equal(adopter, expected, "Owner of pet ID 8 should be recorded.");
  }
    // 测试所有领养者
  function testGetAdopterAddressByPetIdInArray() public {
  // 领养者的地址就是本合约地址
    address expected = address(this);
    address[16] memory adopters = adoption.getAdopters();
    Assert.equal(adopters[8], expected, "Owner of pet ID 8 should be recorded.");
  }
}

truffle test

创建用户接口和智能合约交互

App = {
  web3Provider: null,
  contracts: {},

  init: async function() {
    // Load pets.
    $.getJSON('../pets.json', function(data) {
      var petsRow = $('#petsRow');
      var petTemplate = $('#petTemplate');

      for (i = 0; i < data.length; i ++) {
        petTemplate.find('.panel-title').text(data[i].name);
        petTemplate.find('img').attr('src', data[i].picture);
        petTemplate.find('.pet-breed').text(data[i].breed);
        petTemplate.find('.pet-age').text(data[i].age);
        petTemplate.find('.pet-location').text(data[i].location);
        petTemplate.find('.btn-adopt').attr('data-id', data[i].id);

        petsRow.append(petTemplate.html());
      }
    });

    return await App.initWeb3();
  },

  initWeb3: async function() {
    // Modern dapp browsers...
    if (window.ethereum) {
      App.web3Provider = window.ethereum;
      try {
        // Request account access
        await window.ethereum.enable();
      } catch (error) {
        // User denied account access...
        console.error("User denied account access")
      }
    }
    // Legacy dapp browsers...
    else if (window.web3) {
      App.web3Provider = window.web3.currentProvider;
    }
    // If no injected web3 instance is detected, fall back to Ganache
    else {
      App.web3Provider = new Web3.providers.HttpProvider('http://localhost:7545');
    }
    web3 = new Web3(App.web3Provider);

    return App.initContract();
  },

  initContract: function() {
    // 加载Adoption.json，保存了Adoption的ABI（接口说明）信息及部署后的网络(地址)信息，它在编译合约的时候生成ABI，在部署的时候追加网络信息
    $.getJSON('Adoption.json', function(data) {
      // 用Adoption.json数据创建一个可交互的TruffleContract合约实例。
      var AdoptionArtifact = data;
      App.contracts.Adoption = TruffleContract(AdoptionArtifact);

      // Set the provider for our contract
      App.contracts.Adoption.setProvider(App.web3Provider);

      // Use our contract to retrieve and mark the adopted pets
      return App.markAdopted();
    });

    return App.bindEvents();
  },

  bindEvents: function() {
    $(document).on('click', '.btn-adopt', App.handleAdopt);
  },

  markAdopted: function() {
    var adoptionInstance;

    App.contracts.Adoption.deployed().then(function(instance) {
      adoptionInstance = instance;

      // 调用合约的getAdopters(), 用call读取信息不用消耗gas
      return adoptionInstance.getAdopters.call();
    }).then(function(adopters) {
      for (i = 0; i < adopters.length; i++) {
        if (adopters[i] !== '0x0000000000000000000000000000000000000000') {
          $('.panel-pet').eq(i).find('button').text('Success').attr('disabled', true);
        }
      }
    }).catch(function(err) {
      console.log(err.message);
    });
  },

  handleAdopt: function(event) {
    event.preventDefault();

    var petId = parseInt($(event.target).data('id'));

    var adoptionInstance;

    // 获取用户账号
    web3.eth.getAccounts(function(error, accounts) {
      if (error) {
        console.log(error);
      }

      var account = accounts[0];

      App.contracts.Adoption.deployed().then(function(instance) {
        adoptionInstance = instance;

        // 发送交易领养宠物
        return adoptionInstance.adopt(petId, {from: account});
      }).then(function(result) {
        return App.markAdopted();
      }).catch(function(err) {
        console.log(err.message);
      });
    });
  }
};
$(function() {
  $(window).load(function() {
    App.init();
  });
});

安装MetaMask

在浏览器中安装MetaMask插件：chrome插件
使用前面复制的ganache的助记符，配置钱包并设置自定义的密码
默认连接好localhost:8545 rpc

启动服务

开启lite-server
npm run dev
浏览器访问：http://localhost:3000/
可以执行收养宠物等操作，MetaMask弹出弹窗确定转账操作
收养成功：

标签：function,宠物商店,以太,pet,App,Adoption,truffle,Truffle,data
来源： https://www.cnblogs.com/GarrettWale/p/15440582.html