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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/events/builder.py
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@ -12,7 +12,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
from typing import TYPE_CHECKING, Any, Collection, Dict, List, Optional, Tuple, Union
import attr
from signedjson.types import SigningKey
@ -103,7 +103,7 @@ class EventBuilder:
async def build(
self,
prev_event_ids: List[str],
prev_event_ids: Collection[str],
auth_event_ids: Optional[List[str]],
depth: Optional[int] = None,
) -> EventBase:
@ -136,7 +136,7 @@ class EventBuilder:
format_version = self.room_version.event_format
# The types of auth/prev events changes between event versions.
prev_events: Union[List[str], List[Tuple[str, Dict[str, str]]]]
prev_events: Union[Collection[str], List[Tuple[str, Dict[str, str]]]]
auth_events: Union[List[str], List[Tuple[str, Dict[str, str]]]]
if format_version == EventFormatVersions.ROOM_V1_V2:
auth_events = await self._store.add_event_hashes(auth_event_ids)