Implement max event websocket rate as setting

awx/main/conf.py

@@ -344,6 +344,17 @@ register(
     category_slug='jobs',
 )
 
+register(
+    'MAX_WEBSOCKET_EVENT_RATE',
+    field_class=fields.IntegerField,
+    min_value=0,
+    default=30,
+    label=_('Job Event Maximum Websocket Messages Per Second'),
+    help_text=_('Maximum number of messages to update the UI live job output with per second. Value of 0 means no limit.'),
+    category=_('Jobs'),
+    category_slug='jobs',
+)
+
 register(
     'SCHEDULE_MAX_JOBS',
     field_class=fields.IntegerField,

awx/main/tasks.py

@@ -729,10 +729,6 @@ def with_path_cleanup(f):
     return _wrapped
 
 
-# TODO: move to CTiT settings if we ever get serious about this
-MAX_WEBSOCKET_EVENT_RATE = 30
-
-
 class BaseTask(object):
     model = None
     event_model = None
@@ -744,7 +740,7 @@ class BaseTask(object):
         self.host_map = {}
         self.guid = GuidMiddleware.get_guid()
         self.job_created = None
-        self.recent_event_timings = deque(maxlen=MAX_WEBSOCKET_EVENT_RATE)
+        self.recent_event_timings = deque(maxlen=settings.MAX_WEBSOCKET_EVENT_RATE)
 
     def update_model(self, pk, _attempt=0, **updates):
         """Reload the model instance from the database and update the
@@ -1157,8 +1153,8 @@ class BaseTask(object):
             event_data['event_data']['guid'] = self.guid
 
         # To prevent overwhelming the broadcast queue, skip some websocket messages
-        cpu_time = time.time()
         if self.recent_event_timings:
+            cpu_time = time.time()
             first_window_time = self.recent_event_timings[0]
             inverse_effective_rate = cpu_time - first_window_time
             # if last 30 events came in under 1 second ago
@@ -1175,8 +1171,8 @@ class BaseTask(object):
                 if self.recent_event_timings[0] == self.recent_event_timings[-1]:
                     logger.info('Starting a window of event emission, will pause if I see too many')
                 self.recent_event_timings.append(cpu_time)
-        else:
-            self.recent_event_timings.append(cpu_time)
+        elif self.recent_event_timings.maxlen:
+            self.recent_event_timings.append(time.time())
 
         event_data.setdefault(self.event_data_key, self.instance.id)
         self.dispatcher.dispatch(event_data)