Using Socket.IO in server side with socket.io-client

Question

Using Socket.IO in server side with socket.io-client

I use the socket.io in my app.js and configure it with express framework, now when I run the application both of application and socket.io will start and I can emit messages between client and app.js.

app.js (Server)

var express = require('express'),
    app = express(),
    http = require('http'),
    server = http.creatServer(app),
    socket = require('socket.io'),
    io = socket.listen(server);

server.listen(3000);    

io.sockets.on('connection', function(client){
    client.on('message', function(msg){
        io.sockets.emit('message', msg);
    });
});

Client:

<script type="text/javascript" src="/socket.io/socket.io.js"></script>
<script type="text/javascript">
    var server = io.connect('http://127.0.0.1:3000');
    server.emit('message', 'Hello World');
</script>

But I want to use socket in other Controllers... I use "socket.io-client (https://npmjs.org/package/socket.io-client)", now I want to get messages that emitted from app.js to all sockets.

controller.js (Server)

var io = require('socket.io-client'),
    socket = io.connect('127.0.0.1', {
        port: 3000
    });

socket.on('connect', function(){
    console.log('CONNECTED!!');
    socket.on('message', function(msg){
        console.log("New message:", msg);
    });
});

It can't connect!

javascript
node.js
io
websocket
socket.io

Answer 1

If you don't care who gets the messages, you can do a global broadcast from socket.io. That works inside controllers.

Answer 2

you are not using the client socket to emit. io is the socket.io instance not the client socket that connected.

in server

io.sockets.on('connection', function(client){
    client.on('message', function(msg){
      client.emit('message', msg);
  });
});

if you need to broadcast, then you can use the io instance

io.socket.sockets.emit('message', msg);