Make deleting stale pushers a background update (#9536)

pull/9537/head
Erik Johnston 2021-03-03 12:08:16 +00:00 committed by GitHub
parent a5daae2a5f
commit 16f9f93eb7
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3 changed files with 55 additions and 1 deletions

1
changelog.d/9536.bugfix Normal file
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@ -0,0 +1 @@
Fix deleting pushers when using sharded pushers.

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@ -44,6 +44,11 @@ class PusherWorkerStore(SQLBaseStore):
self._remove_deactivated_pushers,
)
self.db_pool.updates.register_background_update_handler(
"remove_stale_pushers",
self._remove_stale_pushers,
)
def _decode_pushers_rows(self, rows: Iterable[dict]) -> Iterator[PusherConfig]:
"""JSON-decode the data in the rows returned from the `pushers` table
@ -337,6 +342,53 @@ class PusherWorkerStore(SQLBaseStore):
return number_deleted
async def _remove_stale_pushers(self, progress: dict, batch_size: int) -> int:
"""A background update that deletes all pushers for logged out devices.
Note that we don't proacively tell the pusherpool that we've deleted
these (just because its a bit off a faff to do from here), but they will
get cleaned up at the next restart
"""
last_pusher = progress.get("last_pusher", 0)
def _delete_pushers(txn) -> int:
sql = """
SELECT p.id, access_token FROM pushers AS p
LEFT JOIN access_tokens AS a ON (p.access_token = a.id)
WHERE p.id > ?
ORDER BY p.id ASC
LIMIT ?
"""
txn.execute(sql, (last_pusher, batch_size))
pushers = [(row[0], row[1]) for row in txn]
self.db_pool.simple_delete_many_txn(
txn,
table="pushers",
column="id",
iterable=(pusher_id for pusher_id, token in pushers if token is None),
keyvalues={},
)
if pushers:
self.db_pool.updates._background_update_progress_txn(
txn, "remove_stale_pushers", {"last_pusher": pushers[-1][0]}
)
return len(pushers)
number_deleted = await self.db_pool.runInteraction(
"_remove_stale_pushers", _delete_pushers
)
if number_deleted < batch_size:
await self.db_pool.updates._end_background_update("remove_stale_pushers")
return number_deleted
class PusherStore(PusherWorkerStore):
def get_pushers_stream_token(self) -> int:

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@ -16,4 +16,5 @@
-- Delete all pushers associated with deleted devices. This is to clear up after
-- a bug where they weren't correctly deleted when using workers.
DELETE FROM pushers WHERE access_token NOT IN (SELECT id FROM access_tokens);
INSERT INTO background_updates (ordering, update_name, progress_json) VALUES
(5908, 'remove_stale_pushers', '{}');