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Do not wait for background updates to complete do expire URL cache. (#13657)

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Media downloaded as part of a URL preview is normally deleted after two days.
However, while a background database migration is running, the process is
stopped. A long-running database migration can therefore cause the media
store to fill up with old preview files.

This logic was added in #2697 to make sure that we didn't try to run the expiry
without an index on `local_media_repository.created_ts`; the original logic that
needs that index was added in #2478 (in `get_url_cache_media_before`, as
amended by 93247a424a), and is still present.

Given that the background update was added before Synapse v1.0.0, just drop
this check and assume the index exists.
This commit is contained in:
Patrick Cloke 2022-08-30 07:15:54 -04:00 committed by GitHub
parent 20df96a7a7
commit 303b40b988
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2 changed files with 1 additions and 4 deletions
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changelog.d/13657.bugfix Normal file
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@ -0,0 +1 @@
Fix a long-standing bug that downloaded media for URL previews was not deleted while database background updates were running.

4
synapse/rest/media/v1/preview_url_resource.py
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@ -732,10 +732,6 @@ class PreviewUrlResource(DirectServeJsonResource):
logger.debug("Running url preview cache expiry")
if not (await self.store.db_pool.updates.has_completed_background_updates()):
logger.debug("Still running DB updates; skipping url preview cache expiry")
return
def try_remove_parent_dirs(dirs: Iterable[str]) -> None:
"""Attempt to remove the given chain of parent directories