WebSocket over Node.js / Demo

This experiment is using WebSocket over Node.js for signaling.

Install via npm

npm install websocket-over-nodejs

and run the signaler.js nodejs file:

node node_modules/websocket-over-nodejs/signaler.js

Otherwise, follow these steps:

1. Download and extract ZIP file of this repository then copy folder-location.
2. Open Node.js command prompt.
3. Type command cd folder-location where folder-location can be C:\websocket-over-nodejs.
4. Type node signaler to run the node.js server.

OK, now you can listen websocket URL like this:

var websocket = new WebSocket('ws://localhost:8888/');

If you want to deploy your application

First of all; change subdomain in the package.json file:

{
  "name": "just-a-name",
  "subdomain": "must-be-unique",
  "scripts": {
    "start": "signaler.js"
  },
  "version": "0.0.0",
  "engines": {
    "node": "0.10.x"
  },
  "dependencies": {
    "websocket": "1.0.x"
  }
}

1. Create an account at nodejitsu
2. Use same Node.js command prompt window
3. Type jitsu deploy

and you're done!

Remember: jitsu deploy command will deploy the entire directory containing all all files including node_modules (i.e. dependencies).

Now, you can listen your nodejitsu server like this:

// Remember, must include port "80"!
var websocket = new WebSocket('ws://subdomain.jit.su:80');

How to use?

In ui.js files you can find openSocket method; or in all libraries; you can find openSignalingChannel method.

// ws://wsnodejs.jit.su:80


var SIGNALING_SERVER = 'ws://' + document.domain + ':1338/';
connection.openSignalingChannel = function(config) {
    config.channel = config.channel || this.channel || 'default-channel';
    var websocket = new WebSocket(SIGNALING_SERVER);
    websocket.channel = config.channel;
    websocket.onopen = function() {
        websocket.push(JSON.stringify({
            open: true,
            channel: config.channel
        }));
        if (config.callback)
            config.callback(websocket);
    };
    websocket.onmessage = function(event) {
        config.onmessage(JSON.parse(event.data));
    };
    websocket.push = websocket.send;
    websocket.send = function(data) {
        websocket.push(JSON.stringify({
            data: data,
            channel: config.channel
        }));
    };
}

Signaling Concepts

Interested to understand WebRTC Signaling Concepts? Read this document.

License

MIT. Copyright (c) 2014 webrtclabs.