diff options
Diffstat (limited to 'synapse/handlers/sliding_sync.py')
| -rw-r--r-- | synapse/handlers/sliding_sync.py | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/synapse/handlers/sliding_sync.py b/synapse/handlers/sliding_sync.py index 1db96ad41c..0fe66c8bd2 100644 --- a/synapse/handlers/sliding_sync.py +++ b/synapse/handlers/sliding_sync.py @@ -64,7 +64,10 @@ from synapse.storage.databases.main.state import ( ROOM_UNKNOWN_SENTINEL, Sentinel as StateSentinel, ) -from synapse.storage.databases.main.stream import CurrentStateDeltaMembership +from synapse.storage.databases.main.stream import ( + CurrentStateDeltaMembership, + PaginateFunction, +) from synapse.storage.roommember import MemberSummary from synapse.types import ( DeviceListUpdates, @@ -1863,10 +1866,13 @@ class SlidingSyncHandler: # We should return historical messages (before token range) in the # following cases because we want clients to be able to show a basic # screen of information: + # # - Initial sync (because no `from_token` to limit us anyway) # - When users `newly_joined` # - For an incremental sync where we haven't sent it down this # connection before + # + # Relevant spec issue: https://github.com/matrix-org/matrix-spec/issues/1917 from_bound = None initial = True if from_token and not room_membership_for_user_at_to_token.newly_joined: @@ -1927,7 +1933,36 @@ class SlidingSyncHandler: room_membership_for_user_at_to_token.event_pos.to_room_stream_token() ) - timeline_events, new_room_key = await self.store.paginate_room_events( + # For initial `/sync` (and other historical scenarios mentioned above), we + # want to view a historical section of the timeline; to fetch events by + # `topological_ordering` (best representation of the room DAG as others were + # seeing it at the time). This also aligns with the order that `/messages` + # returns events in. + # + # For incremental `/sync`, we want to get all updates for rooms since + # the last `/sync` (regardless if those updates arrived late or happened + # a while ago in the past); to fetch events by `stream_ordering` (in the + # order they were received by the server). + # + # Relevant spec issue: https://github.com/matrix-org/matrix-spec/issues/1917 + # + # FIXME: Using workaround for mypy, + # https://github.com/python/mypy/issues/10740#issuecomment-1997047277 and + # https://github.com/python/mypy/issues/17479 + paginate_room_events_by_topological_ordering: PaginateFunction = ( + self.store.paginate_room_events_by_topological_ordering + ) + paginate_room_events_by_stream_ordering: PaginateFunction = ( + self.store.paginate_room_events_by_stream_ordering + ) + pagination_method: PaginateFunction = ( + # Use `topographical_ordering` for historical events + paginate_room_events_by_topological_ordering + if from_bound is None + # Use `stream_ordering` for updates + else paginate_room_events_by_stream_ordering + ) + timeline_events, new_room_key = await pagination_method( room_id=room_id, # The bounds are reversed so we can paginate backwards # (from newer to older events) starting at to_bound. @@ -1938,7 +1973,6 @@ class SlidingSyncHandler: # We add one so we can determine if there are enough events to saturate # the limit or not (see `limited`) limit=room_sync_config.timeline_limit + 1, - event_filter=None, ) # We want to return the events in ascending order (the last event is the |