node.js+react.js+xterm.js构建webssh
概述
先讲一下简单的原理:前端和后端的通信,使用的是socket.js,后端连接服务器,使用的是ssh2.js,页面显示出控制台这个操作页面,使用的是xterm.js。整个工作流程就是:前端在xterm.js里面输入文字,通过socket和后端通信,后端把前端传过来的命令,通过ssh2连接服务器,得到服务器返回的数据,通过socket传给前端,前端再显示出socket返回的内容。所以这里贴一下几个官网,可以先了解一下。
https://socket.io/
https://github.com/staltz/xst...
https://github.com/mscdex/ssh2
再讲一下需求:我这里要创建一个服务端,能够支持从前端得到要连接的服务器信息,再去创建ssh2连接,并且在页面上能够同时存在多个xterm窗口,这些窗口不存在信息的相互影响。
服务端代码
在收到前端的createNewServer信息时,会创建一个新的ssh连接。为了区分不同的服务器窗口,前端必须传递一个msgId,用于给后端发送消息。然后前端就能够监听不同的msgId,将socket传递过来的信息显示到不同的xterm窗口上。
var app = require('express')(); var http = require('http').Server(app); var io = require('socket.io')(http); var utf8 = require('utf8'); var SSHClient = require('ssh2').Client; function createNewServer(machineConfig, socket) { var ssh = new SSHClient(); let {msgId, ip, username, password} = machineConfig; ssh.on('ready', function () { socket.emit(msgId, '\r\n***' + ip + ' SSH CONNECTION ESTABLISHED ***\r\n'); ssh.shell(function(err, stream) { if(err) { return socket.emit(msgId, '\r\n*** SSH SHELL ERROR: ' + err.message + ' ***\r\n'); } socket.on(msgId, function (data) { stream.write(data); }); stream.on('data', function (d) { socket.emit(msgId, utf8.decode(d.toString('binary'))); }).on('close', function () { ssh.end(); }); }) }).on('close', function () { socket.emit(msgId, '\r\n*** SSH CONNECTION CLOSED ***\r\n'); }).on('error', function (err) { console.log(err); socket.emit(msgId, '\r\n*** SSH CONNECTION ERROR: ' + err.message + ' ***\r\n'); }).connect({ host: ip, port: 22, username: username, password: password }); } io.on('connection', function(socket) { socket.on('createNewServer', function(machineConfig) {//新建一个ssh连接 console.log("createNewServer") createNewServer(machineConfig, socket); }) socket.on('disconnect', function(){ console.log('user disconnected'); }); }) http.listen(8000, function() { console.log('listening on * 8000'); })
前端代码
前端主要是先打开socket.io连接,在点击创建按钮的时候,把服务器的信息和msgId传递给后台,让后台能够创建一个新的ssh连接,然后在xterm窗口输入数据的时候,把数据发送给服务端,并且监听服务器返回的消息显示到界面上来。
App.js
import React, { Component } from 'react'; import logo from './logo.svg'; import './App.css'; import NetWorkConfig from "./NetWorkConfig" import "../node_modules/xterm/dist/xterm.css" import 'antd/dist/antd.css'; class App extends Component { render() { return ( <div className="App"> <NetWorkConfig/> </div> ); } } export default App;
NetWorkConfig.jsx
import React from "react" import openSocket from 'socket.io-client'; import {Button} from "antd" import XtermTest from "./XtermTest" const socket = openSocket('http://localhost:8000'); class NetWorkConfig extends React.Component { constructor(props) { super(props); this.createServer1 = this.createServer1.bind(this); this.createServer2 = this.createServer2.bind(this); this.term1 = null; this.term2 = null; } createServer1() { socket.emit("createNewServer", {msgId: 'net1', ip: "192.168.79.100", username: "lss", password: "PassW0rd"}); let term = this.term1.getTerm(); term.on("data", function(data) { socket.emit('net1', data); }) socket.on("net1", function (data) { console.log(data) term.write(data) }) } createServer2() { socket.emit("createNewServer", {msgId: 'net2', ip: "192.168.79.100", username: "lss", password: "PassW0rd"}); let term = this.term2.getTerm(); term.on("data", function(data) { socket.emit('net2', data); }) socket.on("net2", function (data) { term.write(data) }) } render() { return <div> <Button onClick={this.createServer1}>按钮1</Button> <Button onClick={this.createServer2}>按钮2</Button> <XtermTest ref={(term1) => {this.term1 = term1}} id="net1"/> <XtermTest ref={(term2) => {this.term2 = term2}} id="net2"/> </div> } } export default NetWorkConfig
XtermTest.jsx
import React from "react" import { Terminal } from 'xterm'; import * as fit from '../node_modules/xterm/dist/addons/fit/fit'; class XtermTest extends React.Component { constructor(props) { super(props) this.getTerm = this.getTerm.bind(this); } render() { return <div id={this.props.id}></div> } getTerm() { return this.term; } componentDidMount() { Terminal.applyAddon(fit); let {id} = this.props; let terminalContainer = document.getElementById(id); this.term = new Terminal({cursorBlink: true}); this.term.open(terminalContainer); this.term.fit(); } } export default XtermTest
启动说明
先node启动server.js,然后再正常启动react工程。目前还是一个比较粗糙的版本。效果如图:点击按钮1的时候初始化第一个窗口,点击按钮2的时候初始化第二个窗口。因为传递了不同的msgId,两个窗口不会有信息的干扰。