Using socket.io ...

[codevin]

I am exploring use of socket.io directly from a module. This seems to work, and these are instructions if you want to try.

(However, the sessions need to play well with socket.io, as given here: http://www.danielbaulig.de/socket-ioexpress/. This needs some exploration. )

First change app.js (in root of calipso) as follows:

var socket_io=require("socket.io");
...
// within express.boot() function
     if (app) {
          var server=http.createServer(app);  // socket.io requires access to http.Server object.
          var io=socket_io.listen(server);
          app.socketIO=io;  // You need to access this object from modules as calipso.app.socketIO
          var out = server.listen(port, function () {
             ...
          }
          ...
     }

And within the module, use this code. I presume this should be in the route handler code (as opposed to init).

calipso.app.socketIO.sockets.on('connection',  function(socket) {
     socket.emit('news', <<data object>>); // send something to client.
     socket.on('flag', function(data){...} ); // receive something from client.
}

And you will also need to put in the usual socket.io client code in one of the module templates.