Merge pull request #1120 from matrix-org/erikj/push_invite_cache

Ensure we don't mutate the cache of push rules

synapse/push/bulk_push_rule_evaluator.py

@@ -26,15 +26,6 @@ from synapse.visibility import filter_events_for_clients_context
 logger = logging.getLogger(__name__)
 
 
-@defer.inlineCallbacks
-def _get_rules(room_id, user_ids, store):
-    rules_by_user = yield store.bulk_get_push_rules(user_ids)
-
-    rules_by_user = {k: v for k, v in rules_by_user.items() if v is not None}
-
-    defer.returnValue(rules_by_user)
-
-
 @defer.inlineCallbacks
 def evaluator_for_event(event, hs, store, context):
     rules_by_user = yield store.bulk_get_push_rules_for_room(
@@ -48,6 +39,7 @@ def evaluator_for_event(event, hs, store, context):
         if invited_user and hs.is_mine_id(invited_user):
             has_pusher = yield store.user_has_pusher(invited_user)
             if has_pusher:
+                rules_by_user = dict(rules_by_user)
                 rules_by_user[invited_user] = yield store.get_push_rules_for_user(
                     invited_user
                 )