Last Updated: December 14, 2016

Socket.io and OpenShift Websockets

Socket.io works great with OpenShift's websockets. All you need to do is to configure the socket.io to use the "websocket" transport.
The rest of transports won't work.

self.app = express();
self.server = require('http').createServer(self.app);
self.io = io.listen(self.server);
self.io.configure(function(){
    self.io.set("transports", ["websocket"]);
});

Written by Sorin Baba

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9 Responses

Add your response

boopathi

https://www.openshift.com/blogs/paas-websockets
It seems, we have to use the port "8000" and "8443" for websockets.
I've been trying to change this on the client using

//server
io = require('socket.io').listen(8000);
//client
var socket = io.connect("http://something:8000");

But request keeps going to port 80 ... Is there any work around for this ?

over 1 year ago ·

bsorin

On the server side you should use the default port provided by openshift:

self.port      = process.env.OPENSHIFT_INTERNAL_PORT || process.env.OPENSHIFT_NODEJS_PORT || 8080;

In this way I initialized the socket.io on the server side:

// socket.io initialization on the server side
self.initializeSocketIO = function() {
        self.server = require('http').createServer(self.app);
        self.io = require('socket.io').listen(self.server);
        self.io.enable('browser client minification');  // send minified client
        self.io.enable('browser client etag');          // apply etag caching logic based on version number
        self.io.enable('browser client gzip');          // gzip the file
        self.io.set('log level', 1);                    // reduce logging

        self.io.set('transports', [
                'websocket'
            ]);
        return this;
    }

    self.addSocketIOEvents = function() {
        self.io.sockets.on('connection', function (socket) {
          socket.emit('news', { hello: 'world' });
          socket.on('my other event', function (data) {
            console.log(data);
      });
    });
}

/**
 *  Initializes the sample application.
 */
self.initialize = function() {
    self.setupVariables();
    self.populateCache();
    self.setupTerminationHandlers();

    // Create the express server and routes.
    self.initializeServer();
    self.initializeSocketIO().addSocketIOEvents();
};

On the client side I used it in this way (index.html):

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
</head>
<body>
ok
</body>

<script src="/socket.io/socket.io.js"></script>
<script>
  var socket = io.connect('ws://you-app.rhcloud.com:8000/');
  socket.on('news', function (data) {
    console.log(data);
    socket.emit('my other event', { my: 'data' });
  });
</script>
</html>

It should work fine for you. You used a bad port number.

over 1 year ago ·