Is it possible to open two sockets on server side

I am building an app using nodeJS along with socket io . I have a server.js file in which i did the following :

var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
io.on('connection', function(socket){
console.log("a user is connected");
});

Also i have another file "api.js" in which i have the following function :

filter.watch(function(error, result){
  if (!error){  
    var newblock = new Block(web3.eth.getBlock(result));

    newblock.save(function (err) {
                  if (err) return handleError(err);
                  // saved!
    })
  }
});

Im trying to send the object "newblock" (which is changing constantly) from the file api.js to server.js with socket io . I tried doing " socket.emit('fromApi_toserver',newblock)" in api.js but it's not working... Does anyone have any ideas ?

via Sarah