Question

I’m looking for a way to implement a bidirectional RPC in node.js (means that both client and server provide remote-callable procedures, preferable like json-rpc). It should be usable on top of socket.io and TCP/IP sockets for clients. I was about to use nowjs for websockets and provide a seperate API for “normal” sockets.

Now I just found dnode which claims to work with both. “It works over network sockets and even in the browser with socket.io.”

I need to pass JSON objects (containing strings) to each other side. The clients will be written in JavaScript (Browser), JavaScript (Appcelerator Titanium), C# and maybe Java (Android), but there’s only an implementation for Java. I read the protocol and I think it’s not that easy to implement.

Also there is a method name exchange after connection is established which would be quite a overhead in my application, I don’t need it as I know what I implemented on the other side (it’s not a public api).

Someone has experience with it or know alternatives? I’m not sure if it’s the right thing for my purpose, I need to implement CRUD and PUB/SUB.

Answer 1

Use socket.io , it has support for rooms which can be stored memory or a Redis Pub/Sub implementation.
You can also namespace your sockets and provide CRUD through events.

var io = require('socket.io').listen(80);

var someResource = io
  .of('/someResource')
  .on('create', function (socket) {
    createSomeResource()
  })
  .on('read', function(socket) {
    readSomeResource(id, function(){
      io.sockets.in('roomBasedOnSessionId').emit('data', {my:'json'})
    })
  })

Here is a great walkthrough of some of the topics you’ll need, including references to sockets and session sharing.
http://www.danielbaulig.de/socket-ioexpress/