Enabled optimized mode for redis

Author: chillaq

splitio/client/factory.py

@@ -424,9 +424,10 @@ def _build_redis_factory(api_key, cfg):
                         _MIN_DEFAULT_DATA_SAMPLING_ALLOWED)
         data_sampling = _MIN_DEFAULT_DATA_SAMPLING_ALLOWED
 
+    imp_strategy = StrategyDebugMode() if cfg['impressionsMode'] == ImpressionsMode.DEBUG else StrategyOptimizedMode(ImpressionsCounter())
     imp_manager = ImpressionsManager(
         _wrap_impression_listener(cfg['impressionListener'], sdk_metadata),
-        StrategyDebugMode())
+        imp_strategy)
 
     recorder = PipelinedRecorder(
         redis_adapter.pipeline,

splitio/storage/redis.py

@@ -431,6 +431,8 @@ def put(self, impressions):
         :return: Whether the impression has been added or not.
         :rtype: bool
         """
+        if impressions == []:
+            return False
         bulk_impressions = self._wrap_impressions(impressions)
         try:
             inserted = self._redis.rpush(self.IMPRESSIONS_QUEUE_KEY, *bulk_impressions)