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/storage/databases/main/relations.py | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'synapse/storage/databases/main/relations.py') diff --git a/synapse/storage/databases/main/relations.py b/synapse/storage/databases/main/relations.py index 0018d6f7ab..fa3266c081 100644 --- a/synapse/storage/databases/main/relations.py +++ b/synapse/storage/databases/main/relations.py @@ -22,6 +22,7 @@ from typing import ( List, Mapping, Optional, + Sequence, Set, Tuple, Union, @@ -171,7 +172,7 @@ class RelationsWorkerStore(SQLBaseStore): direction: Direction = Direction.BACKWARDS, from_token: Optional[StreamToken] = None, to_token: Optional[StreamToken] = None, - ) -> Tuple[List[_RelatedEvent], Optional[StreamToken]]: + ) -> Tuple[Sequence[_RelatedEvent], Optional[StreamToken]]: """Get a list of relations for an event, ordered by topological ordering. Args: @@ -397,7 +398,9 @@ class RelationsWorkerStore(SQLBaseStore): return result is not None @cached() - async def get_aggregation_groups_for_event(self, event_id: str) -> List[JsonDict]: + async def get_aggregation_groups_for_event( + self, event_id: str + ) -> Sequence[JsonDict]: raise NotImplementedError() @cachedList( -- cgit 1.4.1