chuckt_redis

ChuckT node module

ChuckT-node is a node server component for triggering and/or listening to events over the SockJS websocket API. This client is intended to be used in conjunction with the client-side ChuckT JavaScript library:

• chuckt

ChuckT-Redis

Injects publish and subscribe into ChuckT which almost replicates and simplifies the core features of socket.io into sockjs.

Usage:

Installation

The recommended way to install chuckt-node is through npm:

npm install chuckt_redis

Initialization

ChuckT instances require a socket connection:

var sockjs = require('sockjs');
var chuckt = require('chuck_redis');
 
// To set a global reference to all clients
var connections={};
 
// A global reference to the redis publisher
var publisher = redis.createClient();
 
var sock = sockjs.createServer();
sock.on('connection', function(conn) {
  var socket = new ChuckT(conn,connections,publisher);
  // ... do chuckt stuff like add listeners or emit events

By default the clients don't subscribe to namespaces, as not all clients require to be join any namespaces. To initialise pubsub for a client

socket.initPub();

chuck_redis has 4 basic methods

Emit an event to the frontend/browser

socket.emitToBrowser('some-event', 'bar');

Emit an event to all the clients browsers.

socket.emitToAllBrowsers('some-event', 'bar');

Emit an event to all the clients in a channel

socket.emitToChannel('some-event', 'bar');

Emit an event to all the clients in a channel except the broadcaster

socket.emitToPeers('some-event', 'bar');

Change the namespace of the socket

socket.switchChannel('nameOfTheChannel');

Functions such as emitToBrowser and emitToAllBrowsers works even if a user if not part of any namespaces.

When any emit function is called you can send any number or arbitrary arguments.

Listen to events fired from the frontend

Any number of arguments and even a callback can be passed with events. The callback is essentially just a proxy to a callback that is defined (and executed) on the frontend:

chuckt.on('another-event', function(arg1, arg2, callback) {
  // ... do stuff with arguments
  callback();
});

Some events may only pass a callback:

chuckt.on('another-event-2', function(callback) {
  // ... do stuff without arguments
  callback();
});

You may want to pass arguments back to the frontend's callback:

chuckt.on('another-event-3', function(callback) {
  // ... do stuff without arguments
  callback('dear frontend', 'you may find these arguments compelling');
});

And sometimes, your event may not come with any arguments nor a callback:

chuckt.on('another-event-4', function() {
  // ... do stuff without ever acknowledging receipt
});

A big thanks to epixa/chuckt-node for making event driven possible in sockjs.