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Return read-only collections from @cached methods (#13755)

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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 <seanq@matrix.org>
Co-authored-by: David Robertson <davidr@element.io>
This commit is contained in:
Sean Quah 2023-02-10 23:29:00 +00:00 • committed by GitHub
parent 14be78d492
commit d0c713cc85
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27 changed files with 98 additions and 77 deletions
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6
synapse/handlers/directory.py
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@ -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
"""