如何在Node js中使用Socket.io-client连接两个Socket.io节点应用程序 [英] How to connect Two Socket.io Node Application using Socket.io-client in Node js

问题描述

在我的应用程序中，我需要连接两个socket.io节点应用程序。使用socket.io-client，我们可以这样做。但是我不知道socket.io-client如何工作以及在哪里包含。 p>

第一个节点应用程序

  var express = require（'express'）
，http = require（'http'）; 
 
 var app = express（）; 
 
 app.use（function（req，res）{
 app.use（express.static（__ dirname +'/ public'））; 
 
}） ; 
 
 var server = http.createServer（app）; 
 var io = require（'socket.io'）。listen（server）; 
 server.listen（3000）; 
 
 
 io.sockets.on（'connection'，function（socket）{
 
 socket.on（'eventFiredInClient'，function（data）{
 
 socket.emit（'secondNodeAppln'，data）; //我需要在我的第二个节点应用程序中获取此事件我如何使用socket.io-client 
 
 }）; 
 
}）; 
  

第二个节点应用程序

  var express = require（'express'）; 
 var http = require（'http'）; 
 var app = express（）; 
 app.configure（function（）{
 app.use（express.static（__ dirname +'/ public'））; 
}）; 
 var server = http.createServer（app）; 
 var serverAddress ='127.0.0.1'; 
 var serverPort = 3000; // first node appln port 
 var clientio = require（'socket.io-client'）; 
 var socket = clientio.connect（serverAddress，{port：serverPort}）; 
 socket.on（'connect'，function（）{
 
 console.log（'connected'）; 
 
}）; 
 
 socket.on（'disconnect'，function（）{
 
 console.log（'disconnect'）; 
 
}）; 
 
 
 var io = require（'socket.io'）。listen（server）; 
 
 server.listen（6509）; 
 
 //这里我需要获取第一个节点应用程序中引发的'secondNodeAppln'事件。我如何做到这一点。 
  

解决方案

你需要创建一个socket.io客户端第一个应用程序：

  var io = require（'socket.io'）。 //这是socket.io服务器
 var clientio = require（'socket.io-client'）; //这是socket.io客户端
 var client = clientio.connect（...）; //连接到第二个应用程序
 
 io.sockets.on（'connection'，function（socket）{
 socket.on（'eventFiredInClient'，function（data）{
 client.emit（'secondNodeAppln'，data）; //将其发送到您的第二个应用程序
}）; 
}）; 
  

在您的第二个应用程序中，只要听这些事件：

  io.sockets.on（'connection'，function（socket）{
 socket.on（'secondNodeAppln'，function（data）{
 
}）; 
}）; 
  

有一些竞争条件，因为上面的代码不等待一个连接事件在客户端套接字传递之前。 https://gist.github.com/robertklep/5500797rel =nofollow>这个要点用于独立演示。将三个文件保存到目录中，启动服务器：

  node serverserver& 
 node clientserver 
  

并打开 http：// localhost：3012 。

In my application i need to connect two socket.io node applications.Using socket.io-client we can do like this.But i don't know how socket.io-client works and where to include that.

First Node Application

      var express = require('express')
          , http = require('http');

      var app = express();

      app.use(function (req, res) {
         app.use(express.static(__dirname + '/public'));

     });

     var server = http.createServer(app);
     var io = require('socket.io').listen(server);
     server.listen(3000);


     io.sockets.on('connection',function(socket){

      socket.on('eventFiredInClient',function(data){

      socket.emit('secondNodeAppln',data);// i need to get this event in my 2nd node application how can i do this by using socket.io-client

    });

     });

Second Node Application

    var express=require('express');
    var http=require('http');
    var app=express();
    app.configure(function(){
      app.use(express.static(__dirname + '/public'));
    });
    var server = http.createServer(app);
    var serverAddress = '127.0.0.1'; 
    var serverPort = 3000; //first node appln port
    var clientio = require('socket.io-client');
    var socket = clientio.connect(serverAddress , { port: serverPort }); 
    socket.on('connect', function(){ 

       console.log('connected');

    });

    socket.on('disconnect', function(){

       console.log('disconnected');

     });


   var io = require('socket.io').listen(server);

   server.listen(6509);

   //here i need to get the 'secondNodeAppln' event raised in first node application.How can i do this.

解决方案

You need to create a socket.io client in your first app:

var io        = require('socket.io').listen(server); // this is the socket.io server
var clientio  = require('socket.io-client');         // this is the socket.io client
var client    = clientio.connect(...);               // connect to second app

io.sockets.on('connection',function(socket) {
  socket.on('eventFiredInClient',function(data) {
    client.emit('secondNodeAppln', data); // send it to your second app
  });
});

And in your second app, just listen for those events:

io.sockets.on('connection', function (socket) {
  socket.on('secondNodeAppln', function(data) {
    ...
  });
});

There's a bit of a race condition because the code above doesn't wait for a connect event on the client socket before passing events to it.

EDIT see this gist for a standalone demo. Save the three files to a directory, start the servers:

node serverserver &
node clientserver

And open http://localhost:3012 in your browser.

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