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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>
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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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4
synapse/storage/databases/main/user_directory.py
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@ -16,9 +16,9 @@ import logging
import re
from typing import (
TYPE_CHECKING,
Dict,
Iterable,
List,
Mapping,
Optional,
Sequence,
Set,
@ -586,7 +586,7 @@ class UserDirectoryBackgroundUpdateStore(StateDeltasStore):
)
@cached()
async def get_user_in_directory(self, user_id: str) -> Optional[Dict[str, str]]:
async def get_user_in_directory(self, user_id: str) -> Optional[Mapping[str, str]]:
return await self.db_pool.simple_select_one(
table="user_directory",
keyvalues={"user_id": user_id},