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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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synapse/handlers/receipts.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, Iterable, List, Optional, Tuple
from typing import TYPE_CHECKING, Iterable, List, Optional, Sequence, Tuple
from synapse.api.constants import EduTypes, ReceiptTypes
from synapse.appservice import ApplicationService
@ -189,7 +189,7 @@ class ReceiptEventSource(EventSource[int, JsonDict]):
@staticmethod
def filter_out_private_receipts(
rooms: List[JsonDict], user_id: str
rooms: Sequence[JsonDict], user_id: str
) -> List[JsonDict]:
"""
Filters a list of serialized receipts (as returned by /sync and /initialSync)