Invalidate rooms for user caches when receiving membership events (#1…

…4155) This should fix a race where the event notification comes in over replication before the state replication, leaving a window during which a sync may get an incorrect list of rooms for the user.
matrix-org · Oct 17, 2022 · 2c2c3f8 · 2c2c3f8
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diff --git a/changelog.d/14155.misc b/changelog.d/14155.misc
@@ -0,0 +1 @@
+Invalidate rooms for user caches on replicated event, fix sync cache race in synapse workers. Contributed by Nick @ Beeper (@fizzadar).
diff --git a/synapse/storage/databases/main/cache.py b/synapse/storage/databases/main/cache.py
@@ -252,6 +252,10 @@ def _invalidate_caches_for_event(
             self._attempt_to_invalidate_cache(
                 "get_invited_rooms_for_local_user", (state_key,)
             )
+            self._attempt_to_invalidate_cache(
+                "get_rooms_for_user_with_stream_ordering", (state_key,)
+            )
+            self._attempt_to_invalidate_cache("get_rooms_for_user", (state_key,))
 
         if relates_to:
             self._attempt_to_invalidate_cache("get_relations_for_event", (relates_to,))