Improved connection management on events service.

app/coffee/modules/events.coffee

@@ -31,16 +31,17 @@ class EventsService
     initialize: (sessionId) ->
         @.sessionId = sessionId
         @.subscriptions = {}
+        @.connected = false
+        @.error = false
+        @.pendingMessages = []
 
         if @win.WebSocket is undefined
-            @log.debug "WebSockets not supported on your browser"
+            @log.info "WebSockets not supported on your browser"
 
     setupConnection: ->
         @.stopExistingConnection()
 
-        wshost = @config.get("eventsHost", "localhost:8888")
-        wsscheme = @config.get("eventsScheme", "ws")
-        url = "#{wsscheme}://#{wshost}/events"
+        url = @config.get("eventsUrl", "ws://localhost:8888/events")
 
         @.ws = new @win.WebSocket(url)
         @.ws.addEventListener("open", @.onOpen)
@@ -52,15 +53,67 @@ class EventsService
         if @.ws is undefined
             return
 
-        @.ws.close()
         @.ws.removeEventListener("open", @.onOpen)
         @.ws.removeEventListener("close", @.onClose)
         @.ws.removeEventListener("error", @.onError)
         @.ws.removeEventListener("message", @.onMessage)
+        @.ws.close()
 
         delete @.ws
 
+    serialize: (message) ->
+        if _.isObject(message)
+            return JSON.stringify(message)
+        return message
+
+    sendMessage: (message) ->
+        @.pendingMessages.push(message)
+
+        if not @.connected
+            return
+
+        messages = _.map(@.serialize, @.pendingMessages)
+        @.pendingMessages = []
+
+        for msg in messages
+            @.ws.send(msg)
+
+    subscribe: (scope, routingKey, callback) ->
+        if @.error
+            return
+
+        @log.debug("Subscribe to: #{routingKey}")
+        subscription = {
+            scope: scope,
+            routingKey: routingKey,
+            callback: _.debounce(callback, 500, {"leading": true, "trailing": false})
+        }
+
+        message = {
+            "cmd": "subscribe",
+            "routing_key": routingKey
+        }
+
+        @.subscriptions[routingKey] = subscription
+        @.sendMessage(message)
+        scope.$on("$destroy", => @.unsubscribe(routingKey))
+
+    unsubscribe: (routingKey) ->
+        if @.error
+            return
+
+        @log.debug("Unsubscribe from: #{routingKey}")
+
+        message = {
+            "cmd": "unsubscribe",
+            "routing_key": routingKey
+        }
+
+        @.sendMessage(message)
+
     onOpen: ->
+        @.connected = true
+
         @log.debug("WebSocket connection opened")
         token = @auth.getToken()
 
@@ -69,7 +122,7 @@ class EventsService
             data: {token: token, sessionId: @.sessionId}
         }
 
-        @.ws.send(JSON.stringify(message))
+        @.sendMessage(message)
 
     onMessage: (event) ->
         @.log.debug "WebSocket message received: #{event.data}"
@@ -86,33 +139,11 @@ class EventsService
 
     onError: (error) ->
         @log.error("WebSocket error: #{error}")
+        @.error = true
 
     onClose: ->
         @log.debug("WebSocket closed.")
-
-    subscribe: (scope, routingKey, callback) ->
-        subscription = {
-            scope: scope,
-            routingKey: routingKey,
-            callback: callback
-        }
-
-        message = {
-            "cmd": "subscribe",
-            "routing_key": routingKey
-        }
-
-        @.subscriptions[routingKey] = subscription
-        @.ws.send(JSON.stringify(message))
-        scope.$on("$destroy", => @.unsubscribe(routingKey))
-
-    unsubscribe: (routingKey) ->
-        message = {
-            "cmd": "unsubscribe",
-            "routing_key": routingKey
-        }
-
-        @.ws.send(JSON.stringify(message))
+        @.connected = false
 
 
 class EventsProvider