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Fix a harmless exception when the staged events queue is empty. (#10592)

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Patrick Cloke 2021-08-13 07:49:06 -04:00 committed by GitHub
parent d2ad397d3c
commit c12b5577f2
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2 changed files with 11 additions and 5 deletions
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1
changelog.d/10592.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug introduced in v1.37.1 where an error could occur in the asyncronous processing of PDUs when the queue was empty.

15
synapse/federation/federation_server.py
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@ -972,13 +972,18 @@ class FederationServer(FederationBase):
# the room, so instead of pulling the event out of the DB and parsing
# the event we just pull out the next event ID and check if that matches.
if latest_event is not None and latest_origin is not None:
(
next_origin,
next_event_id,
) = await self.store.get_next_staged_event_id_for_room(room_id)
if next_origin != latest_origin or next_event_id != latest_event.event_id:
result = await self.store.get_next_staged_event_id_for_room(room_id)
if result is None:
latest_origin = None
latest_event = None
else:
next_origin, next_event_id = result
if (
next_origin != latest_origin
or next_event_id != latest_event.event_id
):
latest_origin = None
latest_event = None
if latest_origin is None or latest_event is None:
next = await self.store.get_next_staged_event_for_room(