以太坊开发（一）

阿里云国内75折 回扣 微信号：monov8
阿里云国际，腾讯云国际，低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号：monov8 飞机：@monov6

以太坊开发

声明本文只用于个人学习。在参考别人文章后结合自己试验所总结的内容仅供参考。

使用Ganache CLI在私有链上搭建智能合约

本文环境

Windows

Truffle v5.5.28 (core: 5.5.28)

Node v16.15.0

Ganache CLI v6.12.2 (ganache-core: 2.13.2)

编译环境vscode

Ganache下载安装

打开终端输入

npm install -g ganache-cli

安装完成后命令行输入$ ganache-cli查看是否安装成功。

注意启动ganache-cli也是此指令。

PS E:\VSCODE\helloworld> ganache-cli
Ganache CLI v6.12.2 (ganache-core: 2.13.2)

Available Accounts
==================
(0) 0x4Ef77E82D5eC8660Dc92e91C771af74e3476028a (100 ETH)
(1) 0x79733c1C637486f1E37dF51979C9bAD767d5d6A1 (100 ETH)
(2) 0xB013643232F3dC05DE3D1a6dB281aB2A3AAb379F (100 ETH)
(3) 0x0Adf75FF3017CB05267F55C0d28C947d71f353C8 (100 ETH)
(4) 0x154A33e652B41ff773398F8E71eb095F95556fe3 (100 ETH)
(5) 0xb81Ccab240F70Cd1Ead20F03eD7676415E7cE3ac (100 ETH)
(6) 0x29116B55aFDb2278a2C4A4E9abf48c052c3F1810 (100 ETH)
(7) 0x03962DB7A11c862715815E029c8e703917c668aa (100 ETH)
(8) 0x48E2021a19eC67e802bC3BB26e59537e7981716C (100 ETH)
(9) 0x9dDBCa6bbbb095607CC7D52cEb0b6e15ee218e32 (100 ETH)

Private Keys
==================
(0) 0x01ba9c1fef0e6143af73547406d6197f25517acc1e116d6be5a2e9c34b65c29f
(1) 0x7e36c1b0c4f6ecc793cb2230296e4ecf8e766380ed31da3b7840a55e2feb332d
(2) 0x820648d31f094b67c88efa5368a17700b91cd08d56525dafb0297946113861e2
(3) 0x384f62cb50e92dd40a61b64569e4826f06e4b58bb641ac146e3c711bc6cb951c
(4) 0xa0ab18b41192e27616b8928a6bd8180f12ed07024d5d93deb8809d8c60fccc81
(5) 0x29dd757fa884ecdb236f8f71b55004c34c6c93f7a04e39402302302aa0f7992c
(6) 0x32ea3c8662f24780f6129d362550f6d17dfda96340554d66c7e0027998d64741
(7) 0x89a25c4983e17c10d3c5f8266b9423cf04db645a1296c02ec165e8a6e96fa573
(8) 0x400fc50e4200c10098ef2bbf54456fbf909da3aa04afcc49fe92354ee0df30f1
(9) 0x097a624e0a6d2e0d6cb963befdbf33b427e9bbf5bddee6446473a45a7fd8c823

HD Wallet
==================
Mnemonic:      fiber obvious coffee census mail pet appear amazing lunar turtle filter wish
Base HD Path:  m/44'/60'/0'/0/{account_index}

Gas Price
==================
20000000000

Gas Limit
==================
6721975

Call Gas Limit
==================
9007199254740991

Listening on 127.0.0.1:8545

使用Truffle编写测试自己的智能合约HelloWorld

创建文件夹并初始化项目

PS E:\VSCODE>mkdir HelloWorld
PS E:\VSCODE>cd HelloWorld
PS E:\VSCODE\helloworld> truffle init

Starting init...
================

> Copying project files to E:\VSCODE\helloworld
Try our scaffold commands to get started:
  $ truffle create contract YourContractName # scaffold a contract
  $ truffle create test YourTestName         # scaffold a test

http://trufflesuite.com/docs

完成后的文件目录如下

  • contracts 智能合约目录
  • migrations 发布脚本目录
  • test 存放测试文件
  • truffle.js Truffle的配置文件
  • truffle-config.js Truffle的配置文件

当使用Windows的命令行时默认的配置文件名与truffle冲突。这种情况下我们推荐使用Windows的power Shell或Git BASH。你也可

以将配置文件重命名为truffle-config.js来避免冲突。

创建一个 HelloWorld合约并编译

  1. 在contracts目录中新建一个HelloWorld.sol文件代码如下
pragma solidity ^0.4.17;

contract HelloWorld {

  //say hello world
  function say() public pure returns (string) {
    return "Hello World";
  }

  //print name
  function print(string name) public pure returns (string) {
    return name;
  }
}
  1. 创建migrations/1_initial_migration.js文件部署脚本将我们刚才创建的HelloWorld.sol文件设置到发布配置文件中内容如下
var HelloWorld = artifacts.require("./HelloWorld.sol");
module.exports = function(deployer) {
	deployer.deploy(HelloWorld);
};
  1. 编辑truffle.js(truffle-config.js)配置文件设置我们稍后要部署智能合约的位置内容如下
module.exports = {
    networks: {
        development: {
          host: "localhost",
          port: 8545,
          network_id: "*"
        }
    }
};

Ganache CLI默认运行在8545端口。

如果要部署到指定的网络可以使用–network参数例如

truffle migrate --network live

多个网络的配置格式如下

networks: {
  development: {
    host: "localhost",
    port: 8545,
    network_id: "*" // match any network
  },
  live: {
    host: "178.25.19.88", // Random IP for example purposes (do not use)
    port: 80,
    network_id: 1,        // Ethereum public network
    // optional config values:
    // gas  Gas limit used for deploys. Default is 4712388
    // gasPrice Gas price used for deploys. Default is 100000000000 (100 Shannon).
    // from - default address to use for any transaction Truffle makes during migrations
    // provider - web3 provider instance Truffle should use to talk to the Ethereum network.
    //          - if specified, host and port are ignored.
  }
}

稳妥起见也可以加入指定编译器内容如下

module.exports = {
  compilers: {
    solc: {
      version: "0.4.17",      // Fetch exact version from solc-bin (default: truffle's version)
      // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
      // settings: {          // See the solidity docs for advice about optimization and evmVersion
      //  optimizer: {
      //    enabled: false,
      //    runs: 200
      //  },
      //  evmVersion: "byzantium"
      // }
    }
  },

  networks: {
    development: {
      host: "localhost",
      port: 8545,
      network_id: "*" // match any network
    },
    live: {
      host: "178.25.19.88", // Random IP for example purposes (do not use)
      port: 80,
      network_id: 1,        // Ethereum public network
      // optional config values:
      // gas  Gas limit used for deploys. Default is 4712388
      // gasPrice Gas price used for deploys. Default is 100000000000 (100 Shannon).
      // from - default address to use for any transaction Truffle makes during migrations
      // provider - web3 provider instance Truffle should use to talk to the Ethereum network.
      //          - if specified, host and port are ignored.
    }
    
  }

};
  1. 代码准备就绪输入truffle compile开始编译
PS E:\VSCODE\helloworld> truffle compile

Compiling your contracts...
===========================
> Compiling .\contracts\HelloWorld.sol-bin. Attempt #1
> Artifacts written to E:\VSCODE\helloworld\build\contracts
> Compiled successfully using:
   - solc: 0.4.17+commit.bdeb9e52.Emscripten.clang

部署智能合约并测试

  1. 首先启动Ganache CLI新开一个命令窗口输入命令ganache-cli如果刚才已经启动过就不需要再次启动了。

  2. 然后回到Truffle输入truffle migrate开始部署

yuyangdeMacBook-Pro:TestTruffle yuyang$ truffle migrate
Using network 'development'.

Network up to date.
  1. 如果出现上面的结果说明没有部署成功输入truffle migrate --reset重新执行所有脚本进行部署暂时不清楚原因。

如果部署成功会显示以下结果

PS E:\VSCODE\helloworld> truffle migrate --reset

Compiling your contracts...
===========================
> Compiling .\contracts\HelloWorld.sol
> Artifacts written to E:\VSCODE\helloworld\build\contracts
> Compiled successfully using:
   - solc: 0.4.17+commit.bdeb9e52.Emscripten.clang


Starting migrations...
======================
> Network name:    'development'
> Network id:      1662306457614
> Block gas limit: 6721975 (0x6691b7)


1_initial_migration.js
======================

   Deploying 'HelloWorld'
   ----------------------
   > transaction hash:    0xa90362bffda2beb9020351f9b88a95a7384c9e21cb1c14adc008f8b9e04a602d
   > Blocks: 0            Seconds: 0
   > contract address:    0xce8C19769f9eC8EE5935108524e5377f990a1cC1
   > block number:        1
   > block timestamp:     1662306500
   > account:             0x4Ef77E82D5eC8660Dc92e91C771af74e3476028a
   > gas used:            176982 (0x2b356)
   > gas price:           20 gwei
   > value sent:          0 ETH
   > total cost:          0.00353964 ETH

   > Saving artifacts
   -------------------------------------
   > Total cost:          0.00353964 ETH

Summary
=======
> Total deployments:   1
> Final cost:          0.00353964 ETH
  1. 开始测试输入truffle console打开truffle控制台测试刚才我们部署的HelloWorld合约
PS E:\VSCODE\helloworld> truffle console
truffle(development)> var contract
undefined
truffle(development)> HelloWorld.deployed().then(function(instance){contract = instance;});
undefined
truffle(development)> contract.say()
'Hello World'
truffle(development)> contract.print("hello world")
'hello world'

var contract和javascript语法一样表示声明一个contract变量。

HelloWorld.deployed().then(function(instance){contract= instance;});

表示将HelloWorld合约主体传递给contract变量。

后面我们就可以直接使用变量contract分别调用say()方法和print(‘’)得到我们想要的结果。

测试成功

参考文件https://www.jianshu.com/p/9233c214e205

阿里云国内75折 回扣 微信号：monov8
阿里云国际，腾讯云国际，低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号：monov8 飞机：@monov6
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