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This commit is contained in:
Brendan Abolivier 2020-01-16 09:55:11 +00:00
parent 48e57a6452
commit e601f35d3b
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GPG Key ID: 1E015C145F1916CD
1 changed files with 12 additions and 6 deletions
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18
synapse/storage/data_stores/main/stream.py
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@ -539,7 +539,9 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
return self.db.runInteraction(
"get_room_event_after_stream_ordering",
self.get_room_event_around_stream_ordering_txn,
room_id, stream_ordering, "f",
room_id,
stream_ordering,
"f",
)
def get_room_event_before_stream_ordering(self, room_id, stream_ordering):
@ -556,7 +558,9 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
return self.db.runInteraction(
"get_room_event_before_stream_ordering",
self.get_room_event_around_stream_ordering_txn,
room_id, stream_ordering, "b",
room_id,
stream_ordering,
"b",
)
def get_room_event_around_stream_ordering_txn(
@ -575,6 +579,11 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
Deferred[(int, int, str)]:
(stream ordering, topological ordering, event_id)
"""
# Figure out which comparison operation to perform and how to order the results,
# using the provided direction.
op = "<=" if dir == "b" else ">="
order = "DESC" if dir == "b" else "ASC"
sql = (
"SELECT stream_ordering, topological_ordering, event_id"
" FROM events"
@ -582,10 +591,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
" AND NOT outlier"
" ORDER BY stream_ordering %s"
" LIMIT 1"
) % (
"<=" if dir == "b" else ">=",
"DESC" if dir == "b" else "ASC",
)
) % (op, order)
txn.execute(sql, (room_id, stream_ordering))
return txn.fetchone()