CODEWITHSUNDEEP
socketsnode.jswebsocket
mat3001
mat3001

Reputation: 271

Channels in Socket.io

I am trying to broadcast a message through the Node.js service socket.io (http://socket.io/) to certain subset of all subscribers.

To be more exact, I would like to use channels that users can subscribe to, in order to efficiently push messages to a couple hundred people at the same time.

I'm not really sure if addEvent('channel_name',x) is the way to go.

I have not found anything in the docs. Any ideas?

Thanks Mat

Upvotes: 5

Views: 8421

Answers (4)

Purefan
Purefan

Reputation: 1506

Seems like this other question would also answer this one, but if it doesnt you should look at socket.io namespaces, think it was introduced just recently but thought it was worth mentioning

Upvotes: 0

jcoglan
jcoglan

Reputation: 2108

This is a little late(!) but I spotted it in my referrer logs (I'm the author of Faye). It's easy to publish messages from your application whether it's in the same server as Faye or not. For example:

var faye = require('faye'),
    http = require('http');

// Set up the server

var server = http.createServer(function(req, res) {
  // dispatch to your app logic...
});

var bayeux = new faye.NodeAdapter({mount: '/bayeux'});
bayeux.attach(server);
server.listen(8000);

If your app logic is in the same server process you can do this:

bayeux.getClient().publish('/channel', {hello: 'world'});

Otherwise you can make a client in Node that connects to your Faye server:

var client = new faye.Client('http://0.0.0.0:8000/bayeux');
client.publish('/channel', {hello: 'world'});

Either way, the Faye server will relay the message to any subscribed clients whether they are server- or client-side. Hope that helps.

Upvotes: 4

bxjx
bxjx

Reputation: 1838

I'm starting my research into the same problem at the moment. Socket.io looks great, but yes, i think you have to manage the subscriber list yourself. Most example apps out there only use a single subscriber list.

I did come across this... http://faye.jcoglan.com/

It turns your server into a pubsub app. It looks like it manages subscriber lists quite well and it provides a nice hierarchy for channels. However, I can't find an example of it responding to published events within the same app that is running faye?? I'm guessing it's possible. I'll have to have a look at the source. It does seem to give an example of running a separate node app on the server that functions as a client.

The other feature I'm looking for is permissions. I'd want only certain clients to be able to publish to certain channels.

Upvotes: 0

Kuroki Kaze
Kuroki Kaze

Reputation: 8481

It seems you can use Redis publish/subscribe functionality for this. See this link.

Upvotes: 0

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