以太坊智能合约开发（2）

truffle 安装

sudo npm install -g truffle  --registry=https://registry.npm.taobao.org

sudo npm install -g ganache-cli --registry=https://registry.npm.taobao.org

sudo npm install ethereumjs-testrpc -g --registry=https://registry.npm.taobao.org

启动testrpc

testrpc

//报错可能是因为端口被占用
sudo lsof -n -P | grep :8545

//解决办法 kill掉进程pid
sudo kill -9 pid

创建truffle 项目

sudo truffle init

truffle_demo
├── contracts  //开发者编写的智能合约
│   └── Migrations.sol
├── migrations //存放部署脚本
│   └── 1_initial_migration.js
├── test //存放测试文件
├── truffle-config.js //truffle 默认配置文件
└── truffle.js

修改项目网络配置

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

新建一个智能合约

SimpleStorage.sol

pragma solidity ^0.4.23;

contract SimpleStorage {
    uint storedData;
    constructor() public {
        storedData = 100;
    }
    function set(uint x) public {
        storedData = x;
    }

    function get() public view returns (uint) {
        return storedData;
    }
}

编译智能合约

sudo truffle compile

build
└── contracts
    ├── Migrations.json
    └── SimpleStorage.json

部署智能合约

sudo truffle migrate --reset

添加测试文件

simple_storage.js

var SimpleStorage = artifacts.require("./SimpleStorage.sol");

contract('SimpleStorage', function(accounts) {

  it("Initial SimpleStorage settings should match", function() {

    return SimpleStorage.deployed().then(function(instance){
        meta = instance;
        return meta.get.call();
    }).then((old)=>{
        console.log("old value:",old);
        return meta.set.call(100000000);
    }).then((msg)=>{
        console.log("update over:",msg);
        return meta.get.call();
    }).then((newValue)=>{
        console.log("new value:",newValue)
    })
  });

});
//测试例程可能不是很合适

测试合约

truffle test