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Refactor and convert Linearizer to async (#12357)

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Refactor and convert `Linearizer` to async. This makes a `Linearizer`
cancellation bug easier to fix.

Also refactor to use an async context manager, which eliminates an
unlikely footgun where code that doesn't immediately use the context
manager could forget to release the lock.

Signed-off-by: Sean Quah <seanq@element.io>
This commit is contained in:
Sean Quah 2022-04-05 15:43:52 +01:00 • committed by GitHub
parent ab3fdcf960
commit 800ba87cc8
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21 changed files with 104 additions and 115 deletions
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synapse/storage/databases/main/roommember.py
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@ -888,7 +888,7 @@ class RoomMemberWorkerStore(EventsWorkerStore):
return frozenset(cache.hosts_to_joined_users)
# Since we'll mutate the cache we need to lock.
with (await self._joined_host_linearizer.queue(room_id)):
async with self._joined_host_linearizer.queue(room_id):
if state_entry.state_group == cache.state_group:
# Same state group, so nothing to do. We've already checked for
# this above, but the cache may have changed while waiting on