Add maximum retries to polling after network error.

Author: Víctor Oliva

lib/transport/lib/polling.js

@@ -15,6 +15,7 @@ function Polling(Receiver, receiveUrl, AjaxObject) {
   this.Receiver = Receiver;
   this.receiveUrl = receiveUrl;
   this.AjaxObject = AjaxObject;
+  this.networkRetries = 0;
   this._scheduleReceiver();
 }
 
@@ -26,6 +27,7 @@ Polling.prototype._scheduleReceiver = function() {
   var poll = this.poll = new this.Receiver(this.receiveUrl, this.AjaxObject);
 
   poll.on('message', function(msg) {
+    self.networkRetries = 0;
     debug('message', msg);
     self.emit('message', msg);
   });
@@ -35,7 +37,8 @@ Polling.prototype._scheduleReceiver = function() {
     self.poll = poll = null;
 
     if (!self.pollIsClosing) {
-      if (reason === 'network') {
+      if (reason === 'network' && self.networkRetries < Polling.NETWORK_RETRIES) {
+        self.networkRetries++;
         self._scheduleReceiver();
       } else {
         self.emit('close', code || 1006, reason);
@@ -54,4 +57,6 @@ Polling.prototype.abort = function() {
   }
 };
 
+Polling.NETWORK_RETRIES = 3;
+
 module.exports = Polling;