From 8aaff851b1f1dbf74482282e70194a69d13ea584 Mon Sep 17 00:00:00 2001 From: Eric Eastwood Date: Thu, 13 Jun 2024 11:36:57 -0500 Subject: [PATCH] Fix `newly_left` rooms not appearing if we returned early (Sliding Sync) (#17301) Fix `newly_left` rooms not appearing if we returned early when `membership_snapshot_token.is_before_or_eq(to_token.room_key)`. Introduced in https://github.com/element-hq/synapse/pull/17187 (part of Sliding Sync) The tests didn't catch it because they had a small typo in it `room_id1` vs `room_id2`. Found while working on https://github.com/element-hq/synapse/pull/17293 --- changelog.d/17301.bugfix | 1 + synapse/handlers/sliding_sync.py | 26 +++++++++++++------------- tests/handlers/test_sliding_sync.py | 2 +- 3 files changed, 15 insertions(+), 14 deletions(-) create mode 100644 changelog.d/17301.bugfix diff --git a/changelog.d/17301.bugfix b/changelog.d/17301.bugfix new file mode 100644 index 0000000000..50383cb4a4 --- /dev/null +++ b/changelog.d/17301.bugfix @@ -0,0 +1 @@ +Add initial implementation of an experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint. diff --git a/synapse/handlers/sliding_sync.py b/synapse/handlers/sliding_sync.py index 1c37f83a2b..de4f33abb8 100644 --- a/synapse/handlers/sliding_sync.py +++ b/synapse/handlers/sliding_sync.py @@ -275,12 +275,6 @@ class SlidingSyncHandler: instance_map=immutabledict(instance_to_max_stream_ordering_map), ) - # If our `to_token` is already the same or ahead of the latest room membership - # for the user, we can just straight-up return the room list (nothing has - # changed) - if membership_snapshot_token.is_before_or_eq(to_token.room_key): - return sync_room_id_set - # Since we fetched the users room list at some point in time after the from/to # tokens, we need to revert/rewind some membership changes to match the point in # time of the `to_token`. In particular, we need to make these fixups: @@ -300,14 +294,20 @@ class SlidingSyncHandler: # 1) Fetch membership changes that fall in the range from `to_token` up to # `membership_snapshot_token` - membership_change_events_after_to_token = ( - await self.store.get_membership_changes_for_user( - user_id, - from_key=to_token.room_key, - to_key=membership_snapshot_token, - excluded_rooms=self.rooms_to_exclude_globally, + # + # If our `to_token` is already the same or ahead of the latest room membership + # for the user, we don't need to do any "2)" fix-ups and can just straight-up + # use the room list from the snapshot as a base (nothing has changed) + membership_change_events_after_to_token = [] + if not membership_snapshot_token.is_before_or_eq(to_token.room_key): + membership_change_events_after_to_token = ( + await self.store.get_membership_changes_for_user( + user_id, + from_key=to_token.room_key, + to_key=membership_snapshot_token, + excluded_rooms=self.rooms_to_exclude_globally, + ) ) - ) # 1) Assemble a list of the last membership events in some given ranges. Someone # could have left and joined multiple times during the given range but we only diff --git a/tests/handlers/test_sliding_sync.py b/tests/handlers/test_sliding_sync.py index 5c27474b96..41ceb517f0 100644 --- a/tests/handlers/test_sliding_sync.py +++ b/tests/handlers/test_sliding_sync.py @@ -326,7 +326,7 @@ class GetSyncRoomIdsForUserTestCase(HomeserverTestCase): # Leave during the from_token/to_token range (newly_left) room_id2 = self.helper.create_room_as(user1_id, tok=user1_tok) - self.helper.leave(room_id1, user1_id, tok=user1_tok) + self.helper.leave(room_id2, user1_id, tok=user1_tok) after_room2_token = self.event_sources.get_current_token()