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/federation/federation_server.py | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'synapse/federation') diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py index 8d36172484..6addc0bb65 100644 --- a/synapse/federation/federation_server.py +++ b/synapse/federation/federation_server.py @@ -23,6 +23,7 @@ from typing import ( Collection, Dict, List, + Mapping, Optional, Tuple, Union, @@ -1512,7 +1513,7 @@ class FederationHandlerRegistry: def _get_event_ids_for_partial_state_join( join_event: EventBase, prev_state_ids: StateMap[str], - summary: Dict[str, MemberSummary], + summary: Mapping[str, MemberSummary], ) -> Collection[str]: """Calculate state to be returned in a partial_state send_join -- cgit 1.5.1