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purge_history: handle sqlite asshattery

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apparently creating a temporary table commits the transaction. because that's a
useful thing.
This commit is contained in:
Richard van der Hoff 2018-02-14 16:41:12 +00:00
parent 278d21b5e4
commit ac27f6a35e
1 changed files with 27 additions and 19 deletions
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46
synapse/storage/events.py
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@ -2093,6 +2093,27 @@ class EventsStore(SQLBaseStore):
# state_groups
# state_groups_state
# we will build a temporary table listing the events so that we don't
# have to keep shovelling the list back and forth across the
# connection. Annoyingly the python sqlite driver commits the
# transaction on CREATE, so let's do this first.
#
# furthermore, we might already have the table from a previous (failed)
# purge attempt, so let's drop the table first.
txn.execute("DROP TABLE IF EXISTS events_to_purge")
txn.execute(
"CREATE TEMPORARY TABLE events_to_purge ("
" event_id TEXT NOT NULL,"
" should_delete BOOLEAN NOT NULL"
")"
)
# create an index on should_delete because later we'll be looking for
# the should_delete / shouldn't_delete subsets
txn.execute("CREATE INDEX ON events_to_purge(should_delete)")
# First ensure that we're not about to delete all the forward extremeties
txn.execute(
"SELECT e.event_id, e.depth FROM events as e "
@ -2115,20 +2136,6 @@ class EventsStore(SQLBaseStore):
logger.info("[purge] looking for events to delete")
# we build a temporary table listing the events so that we don't have
# to keep shovelling the list back and forth across the connection.
txn.execute(
"CREATE TEMPORARY TABLE events_to_purge ("
" event_id TEXT NOT NULL,"
" should_delete BOOLEAN NOT NULL"
")"
)
# create an index on should_delete because later we'll be looking for
# the should_delete / shouldn't_delete subsets
txn.execute("CREATE INDEX ON events_to_purge(should_delete)")
should_delete_expr = "state_key IS NULL"
should_delete_params = ()
if not delete_local_events:
@ -2339,11 +2346,6 @@ class EventsStore(SQLBaseStore):
(True,),
)
# we're now done with the temporary table
txn.execute(
"DROP TABLE events_to_purge"
)
# synapse tries to take out an exclusive lock on room_depth whenever it
# persists events (because upsert), and once we run this update, we
# will block that for the rest of our transaction.
@ -2356,6 +2358,12 @@ class EventsStore(SQLBaseStore):
(topological_ordering, room_id,)
)
# finally, drop the temp table. this will commit the txn in sqlite,
# so make sure to keep this actually last.
txn.execute(
"DROP TABLE events_to_purge"
)
logger.info("[purge] done")
@defer.inlineCallbacks