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Stop reading from event_edges.room_id. (#12914)

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event_edges.room_id is implied by the event id, so there is no need to join on the room id.
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Richard van der Hoff 2022-05-31 13:51:49 +01:00 • committed by GitHub
parent 1e453053cb
commit 5e17922ef7
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4 changed files with 26 additions and 28 deletions
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41
synapse/storage/databases/main/events_worker.py
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@ -1928,23 +1928,6 @@ class EventsWorkerStore(SQLBaseStore):
LIMIT 1
"""
# Check to see whether the event in question is already referenced
# by another event. If we don't see any edges, we're next to a
# forward gap.
forward_edge_query = """
SELECT 1 FROM event_edges
/* Check to make sure the event referencing our event in question is not rejected */
LEFT JOIN rejections ON event_edges.event_id = rejections.event_id
WHERE
event_edges.room_id = ?
AND event_edges.prev_event_id = ?
/* It's not a valid edge if the event referencing our event in
* question is rejected.
*/
AND rejections.event_id IS NULL
LIMIT 1
"""
# We consider any forward extremity as the latest in the room and
# not a forward gap.
#
@ -1954,16 +1937,30 @@ class EventsWorkerStore(SQLBaseStore):
# is useless. The new latest messages will just be federated as
# usual.
txn.execute(forward_extremity_query, (event.room_id, event.event_id))
forward_extremities = txn.fetchall()
if len(forward_extremities):
if txn.fetchone():
return False
# Check to see whether the event in question is already referenced
# by another event. If we don't see any edges, we're next to a
# forward gap.
forward_edge_query = """
SELECT 1 FROM event_edges
/* Check to make sure the event referencing our event in question is not rejected */
LEFT JOIN rejections ON event_edges.event_id = rejections.event_id
WHERE
event_edges.prev_event_id = ?
/* It's not a valid edge if the event referencing our event in
* question is rejected.
*/
AND rejections.event_id IS NULL
LIMIT 1
"""
# If there are no forward edges to the event in question (another
# event hasn't referenced this event in their prev_events), then we
# assume there is a forward gap in the history.
txn.execute(forward_edge_query, (event.room_id, event.event_id))
forward_edges = txn.fetchall()
if not len(forward_edges):
txn.execute(forward_edge_query, (event.event_id,))
if not txn.fetchone():
return True
return False