Open websocket connections immediately

Also made a performance boost to get_model_from_collection_string()

openslides/utils/autoupdate.py

@@ -56,6 +56,9 @@ def ws_add_site(message):
     # Saves the reply channel to the user. Uses 0 for anonymous users.
     websocket_user_cache.add(message.user.id or 0, message.reply_channel.name)
 
+    # Open the websocket connection.
+    send_or_wait(message.reply_channel.send, {'accept': True})
+
     # Collect all elements that shoud be send to the client when the websocket
     # connection is established
     output = []
@@ -74,8 +77,6 @@ def ws_add_site(message):
     # Send all data. If there is no data, then only accept the connection
     if output:
         send_or_wait(message.reply_channel.send, {'text': json.dumps(output)})
-    else:
-        send_or_wait(message.reply_channel.send, {'accept': True})
 
 
 @channel_session_user

openslides/utils/collection.py

@@ -481,6 +481,9 @@ class Collection:
             cache.set(self.get_cache_key(), ids)
 
 
+_models_to_collection_string = {}
+
+
 def get_model_from_collection_string(collection_string):
     """
     Returns a model class which belongs to the argument collection_string.
@@ -493,20 +496,18 @@ def get_model_from_collection_string(collection_string):
             for model in app_config.get_models():
                 yield model
 
+    # On the first run, generate the dict. It can not change at runtime.
+    if not _models_to_collection_string:
         for model in model_generator():
             try:
-            model_collection_string = model.get_collection_string()
+                get_collection_string = model.get_collection_string
             except AttributeError:
                 # Skip models which do not have the method get_collection_string.
                 pass
             else:
-            if model_collection_string == collection_string:
-                # The model was found.
-                break
-    else:
-        # No model was found in all apps.
-        raise ValueError('Invalid message. A valid collection_string is missing.')
-    return model
+                _models_to_collection_string[get_collection_string()] = model
+
+    return _models_to_collection_string[collection_string]
 
 
 def get_single_element_cache_key(collection_string, id):

tests/unit/utils/test_collection.py

@@ -58,7 +58,7 @@ class TestGetModelFromCollectionString(TestCase):
         self.assertEqual(projector_model, Projector)
 
     def test_unknown_app(self):
-        with self.assertRaises(ValueError):
+        with self.assertRaises(KeyError):
             collection.get_model_from_collection_string('invalid/model')