From 158782c3ce1eb92e98df50645b03afcab4f22db0 Mon Sep 17 00:00:00 2001 From: Sean Quah <8349537+squahtx@users.noreply.github.com> Date: Fri, 22 Jul 2022 10:13:01 +0100 Subject: [PATCH] Skip soft fail checks for rooms with partial state (#13354) When a room has the partial state flag, we may not have an accurate `m.room.member` event for event senders in the room's current state, and so cannot perform soft fail checks correctly. Skip the soft fail check entirely in this case. As an alternative, we could block until we have full state, but that would prevent us from receiving incoming events over federation, which is undesirable. Signed-off-by: Sean Quah --- changelog.d/13354.misc | 1 + synapse/handlers/federation_event.py | 10 ++++++++++ 2 files changed, 11 insertions(+) create mode 100644 changelog.d/13354.misc diff --git a/changelog.d/13354.misc b/changelog.d/13354.misc new file mode 100644 index 000000000..e08ee7866 --- /dev/null +++ b/changelog.d/13354.misc @@ -0,0 +1 @@ +Faster room joins: skip soft fail checks while Synapse only has partial room state, since the current membership of event senders may not be accurately known. diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py index a5f4ce7c8..9d9f1696f 100644 --- a/synapse/handlers/federation_event.py +++ b/synapse/handlers/federation_event.py @@ -1664,11 +1664,21 @@ class FederationEventHandler: """Checks if we should soft fail the event; if so, marks the event as such. + Does nothing for events in rooms with partial state, since we may not have an + accurate membership event for the sender in the current state. + Args: event state_ids: The state at the event if we don't have all the event's prev events origin: The host the event originates from. """ + if await self._store.is_partial_state_room(event.room_id): + # We might not know the sender's membership in the current state, so don't + # soft fail anything. Even if we do have a membership for the sender in the + # current state, it may have been derived from state resolution between + # partial and full state and may not be accurate. + return + extrem_ids_list = await self._store.get_latest_event_ids_in_room(event.room_id) extrem_ids = set(extrem_ids_list) prev_event_ids = set(event.prev_event_ids())