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Sliding sync: Fix bg update again (v3) (#17634)

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Follow-up to https://github.com/element-hq/synapse/pull/17631 and
https://github.com/element-hq/synapse/pull/17632 to fix-up
https://github.com/element-hq/synapse/pull/17599

---------

Co-authored-by: Eric Eastwood <eric.eastwood@beta.gouv.fr>
This commit is contained in:
Erik Johnston 2024-08-30 08:54:07 +01:00 committed by GitHub
parent 26f81fb5be
commit 7098d47f29
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2 changed files with 27 additions and 5 deletions
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1
changelog.d/17634.misc Normal file
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@ -0,0 +1 @@
Pre-populate room data used in experimental [MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) Sliding Sync `/sync` endpoint for quick filtering/sorting.

31
synapse/storage/databases/main/events_bg_updates.py
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@ -1961,9 +1961,30 @@ class EventsBackgroundUpdatesStore(StreamWorkerStore, StateDeltasStore, SQLBaseS
return 0
def _find_previous_membership_txn(
txn: LoggingTransaction, room_id: str, user_id: str, stream_ordering: int
txn: LoggingTransaction, room_id: str, user_id: str, event_id: str
) -> Tuple[str, str]:
# Find the previous invite/knock event before the leave event
#
# Here are some notes on how we landed on this query:
#
# We're using `topological_ordering` instead of `stream_ordering` because
# somehow it's possible to have your `leave` event backfilled with a
# negative `stream_ordering` and your previous `invite` event with a
# positive `stream_ordering` so we wouldn't have a chance of finding the
# previous membership with a naive `event_stream_ordering < ?` comparison.
#
# Also be careful because `room_memberships.event_stream_ordering` is
# nullable and not always filled in. You would need to join on `events` to
# rely on `events.stream_ordering` instead. Even though the
# `events.stream_ordering` also doesn't have a `NOT NULL` constraint, it
# doesn't have any rows where this is the case (checked on `matrix.org`).
# The fact the `events.stream_ordering` is a nullable column is a holdover
# from a rename of the column.
#
# You might also consider using the `event_auth` table to find the previous
# membership, but there are cases where somehow a membership event doesn't
# point back to the previous membership event in the auth events (unknown
# cause).
txn.execute(
"""
SELECT event_id, membership
@ -1972,14 +1993,14 @@ class EventsBackgroundUpdatesStore(StreamWorkerStore, StateDeltasStore, SQLBaseS
WHERE
room_id = ?
AND m.user_id = ?
AND e.stream_ordering < ?
ORDER BY e.stream_ordering DESC
AND e.event_id != ?
ORDER BY e.topological_ordering DESC
LIMIT 1
""",
(
room_id,
user_id,
stream_ordering,
event_id,
),
)
row = txn.fetchone()
@ -2106,7 +2127,7 @@ class EventsBackgroundUpdatesStore(StreamWorkerStore, StateDeltasStore, SQLBaseS
_find_previous_membership_txn,
room_id,
user_id,
membership_event_stream_ordering,
membership_event_id,
)
)