From d0c713cc85f094c323b2ba3f02d8ac411a7f0705 Mon Sep 17 00:00:00 2001 From: Sean Quah <8349537+squahtx@users.noreply.github.com> Date: Fri, 10 Feb 2023 23:29:00 +0000 Subject: Return read-only collections from `@cached` methods (#13755) It's important that collections returned from `@cached` methods are not modified, otherwise future retrievals from the cache will return the modified collection. This applies to the return values from `@cached` methods and the values inside the dictionaries returned by `@cachedList` methods. It's not necessary for the dictionaries returned by `@cachedList` methods themselves to be read-only. Signed-off-by: Sean Quah Co-authored-by: David Robertson --- synapse/push/bulk_push_rule_evaluator.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'synapse/push/bulk_push_rule_evaluator.py') diff --git a/synapse/push/bulk_push_rule_evaluator.py b/synapse/push/bulk_push_rule_evaluator.py index 8568aca528..f6a5bffb0f 100644 --- a/synapse/push/bulk_push_rule_evaluator.py +++ b/synapse/push/bulk_push_rule_evaluator.py @@ -22,6 +22,7 @@ from typing import ( List, Mapping, Optional, + Sequence, Set, Tuple, Union, @@ -149,7 +150,7 @@ class BulkPushRuleEvaluator: # little, we can skip fetching a huge number of push rules in large rooms. # This helps make joins and leaves faster. if event.type == EventTypes.Member: - local_users = [] + local_users: Sequence[str] = [] # We never notify a user about their own actions. This is enforced in # `_action_for_event_by_user` in the loop over `rules_by_user`, but we # do the same check here to avoid unnecessary DB queries. @@ -184,7 +185,6 @@ class BulkPushRuleEvaluator: if event.type == EventTypes.Member and event.membership == Membership.INVITE: invited = event.state_key if invited and self.hs.is_mine_id(invited) and invited not in local_users: - local_users = list(local_users) local_users.append(invited) if not local_users: -- cgit 1.5.1