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/handlers/directory.py | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'synapse/handlers/directory.py') diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py index d31b0fbb17..a5798e9483 100644 --- a/synapse/handlers/directory.py +++ b/synapse/handlers/directory.py @@ -14,7 +14,7 @@ import logging import string -from typing import TYPE_CHECKING, Iterable, List, Optional +from typing import TYPE_CHECKING, Iterable, List, Optional, Sequence from typing_extensions import Literal @@ -486,7 +486,7 @@ class DirectoryHandler: ) if canonical_alias: # Ensure we do not mutate room_aliases. - room_aliases = room_aliases + [canonical_alias] + room_aliases = list(room_aliases) + [canonical_alias] if not self.config.roomdirectory.is_publishing_room_allowed( user_id, room_id, room_aliases @@ -529,7 +529,7 @@ class DirectoryHandler: async def get_aliases_for_room( self, requester: Requester, room_id: str - ) -> List[str]: + ) -> Sequence[str]: """ Get a list of the aliases that currently point to this room on this server """ -- cgit 1.4.1