SignalFire.js

An RTCPeerConnection signaling library/npm module. It does the signaling and then gets out of your way.

• Quick Tutorial
• Twitter: @SignalFireJS

Why do I need this?

There are other open-source signaling options, but many create a layer of abstraction around the RTCPeerConnection object. Although this can be useful, it can also be restrictive, especially when the WebRTC specification is still in flux.

The purpose of SignalFire.js is to:

• Only focus on signaling
• Give developer control before signaling
• Return complete control to the developer after signaling

Installation

Server-side

1. npm install signalfire
2. use require('signalfire') in node

Client-side

• The main script is SignalFire.js / client / src / signalfire-client.js
• adaptor.js and socket.io.js are necessary dependencies in the same directory

Basic Usage Example

SignalFire consists of a client-side script and a node module for signaling. Each is show below:

Client-side:

var options = {
	// Server to connect to
	server: "http://localhost:3333",

	// That will be called each time a new peer connection is created
	connector: function(startSignaling, isAnswer){
		var newConnection = new RTCPeerConnection(
			{
			  "iceServers": [{ "url": "stun:stun.l.google.com:19302" }]
			}
		);

		startSignaling(newConnection);
	},

	// Callback function for when the signaling process is complete
	onSignalingComplete: function(rtcPeerConnection){
		// Do something
	}
};

var conn = signalfire.connect(options,function(){
	conn.emit('askServerForPeer',{
		data: someData
	});
});

Server-side:

var signalfire = require('signalfire');

var sf=signalfire.listen(3333,function(peer){
	peer.socket.on('askServerForPeer', function(data){
		peer.connectToPeer(anotherPeer);
	});
},function(error){
	console.log('something went wrong');
});

API Documentation

Server-side

Signalfire Object

Load module with require('signalfire')

listen( port, successCallback, failCallback )

Tells the server to listen on a certain port for socket connections to be used for peer connections. Returns a socket.io manager object.

• port (number) - Server port number to listen on.
• successCallback (function) - Callback function to be returned when a user successful creates a socket connection with the server.
  • Returns peer object
• failCallback (function) - Callback function to be returned when a user fails to create a socket connection with the server.
  • Returns an error message (string)

peer object - server

socket

Contains a socket.io object

connectToPeer( peer )

Connects the peer calling the method to a specified peer

• peer (peer object) - Peer to connect to.

getPeerId()

Returns the unique ID for the peer object.

Client-side

connect( options, successCallback, failCallback )

Creates a socket connection with the specified server. Returns a socket.io manager object.

• options (object) - Setup options
  • server (string || object) - Required. Specifies the server to connect to. server: "http://localhost:3333" or specify an object with a socket-like API (on, emit, ...).
  • connector ( function(startSignaling, isAnswer) ) - Required. A function that creates a new RTCPeerConnection object. The startSignaling function must be called to initiate signaling.
    • startSignaling(peerConnection) - A callback function for that initializes the signaling process. Takes a single parameter that must be an RTCPeerConnection object.
    • isAnswer - A boolean value. True if the client is sending an RTCPeerConnection answer. False if the client is sending an RTCPeerConnection offer.
  • onSignalingComplete (function) - Callback function for when the signaling process has successfully created a peer connection.
  • onSignalingFail (function) - Callback function for when there is an error in the signaling process.
• successCallback (function) - Callback function to be returned when a user successful creates a socket connection with the server.
  • Returns peer object
• failCallback (function) - Callback function to be returned when a user fails to create a socket connection with the server.
  • Returns an error message (string)

peer object - client

socket

Contains a socket.io object