node.js+react.js+xterm.js構建webssh

概述

先講一下簡單的原理：前端和後端的通信，使用的是socket.js,後端連接服務器，使用的是ssh2.js，頁面顯示出控制檯這個操作頁面，使用的是xterm.js。整個工作流程就是：前端在xterm.js裏面輸入文字，通過socket和後端通信，後端把前端傳過來的命令，通過ssh2連接服務器，得到服務器返回的數據，通過socket傳給前端，前端再顯示出socket返回的內容。所以這裏貼一下幾個官網，可以先了解一下。
https://socket.io/
https://github.com/staltz/xst...
https://github.com/mscdex/ssh2
再講一下需求：我這裏要創建一個服務端，能夠支持從前端得到要連接的服務器信息，再去創建ssh2連接，並且在頁面上能夠通過點擊按鈕等方式，創建多個xterm窗口。

服務端代碼

在收到前端的createNewServer信息時，會創建一個新的ssh連接。爲了區分不同的服務器窗口，前端必須傳遞一個msgId，用於給後端發送消息。然後前端就能夠監聽不同的msgId,將socket傳遞過來的信息顯示到不同的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) {//新建一個ssh連接
        console.log("createNewServer")
        createNewServer(machineConfig, socket);
    })

    socket.on('disconnect', function(){
        console.log('user disconnected');
      });
})

http.listen(8000, function() {
    console.log('listening on * 8000');
})

前端代碼

前端主要是先打開socket.io連接，在點擊創建按鈕的時候，把服務器的信息和msgId傳遞給後臺，讓後臺能夠創建一個新的ssh連接，然後在xterm窗口輸入數據的時候，把數據發送給服務端，並且監聽服務器返回的消息顯示到界面上來。
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 = {
            term: null
        }
        this.term2 = {
            term: 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}>按鈕1</Button>
                    <Button onClick={this.createServer2}>按鈕2</Button>
                    <XtermTest ref={(term1) => {this.term1 = term1}} id="net1"/>
                    <XtermTest ref={(term2) => {this.term2 = term2}} id="net2"/>
                </div>

    }

    componentDidMount() {

    }


}

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

啓動說明

先node啓動server.js，然後再正常啓動react工程。目前還是一個比較粗糙的版本。