refactor websockets app

bws.js

@@ -37,7 +37,7 @@ var start = function(cb) {
         if (err) return cb(err);
         var server = config.https ? serverModule.createServer(serverOpts, app) :
           serverModule.Server(app);
-        WsApp.start(server, config);
+        new WsApp().start(server, config);
         return server;
       });
     });
@@ -47,7 +47,7 @@ var start = function(cb) {
       if (err) return cb(err);
       server = config.https ? serverModule.createServer(serverOpts, app) :
         serverModule.Server(app);
-      WsApp.start(server, config);
+      new WsApp().start(server, config);
       return cb(null, server);
     });
   };

lib/wsapp.js

@@ -9,44 +9,43 @@ var Uuid = require('uuid');
 
 var WalletService = require('./server');
 var MessageBroker = require('./messagebroker');
-var BlockchainMonitor = require('./blockchainmonitor');
 
 log.level = 'debug';
 
-var io, messageBroker, blockchainMonitor;
-
 var WsApp = function() {};
 
-WsApp._unauthorized = function(socket) {
+WsApp.prototype._unauthorized = function(socket) {
   socket.emit('unauthorized');
   socket.disconnect();
 };
 
-WsApp._handleNotification = function(notification) {
-  io.to(notification.walletId).emit('notification', notification);
+WsApp.prototype._handleNotification = function(notification) {
+  this.io.to(notification.walletId).emit('notification', notification);
 };
 
-WsApp.start = function(server, opts, cb) {
+WsApp.prototype.start = function(server, opts, cb) {
   opts = opts || {};
   $.checkState(opts.messageBrokerOpts);
 
-  io = require('socket.io')(server);
+  var self = this;
+
+  this.io = require('socket.io')(server);
 
   async.series([
 
     function(done) {
-      messageBroker = new MessageBroker(opts.messageBrokerOpts);
-      messageBroker.onMessage(WsApp._handleNotification);
+      self.messageBroker = new MessageBroker(opts.messageBrokerOpts);
+      self.messageBroker.onMessage(_.bind(self._handleNotification, self));
       done();
     },
     function(done) {
-      io.on('connection', function(socket) {
+      self.io.on('connection', function(socket) {
         socket.nonce = Uuid.v4();
         socket.on('authorize', function(data) {
-          if (data.message != socket.nonce) return WsApp._unauthorized(socket);
+          if (data.message != socket.nonce) return self._unauthorized(socket);
 
           WalletService.getInstanceWithAuth(data, function(err, service) {
-            if (err) return WsApp._unauthorized(socket);
+            if (err) return self._unauthorized(socket);
 
             socket.join(service.walletId);
             socket.emit('authorized');