From 15720092ac7a1af57dde7018a8872d93bbb9d36b Mon Sep 17 00:00:00 2001 From: Richard van der Hoff Date: Fri, 3 Jan 2020 16:09:24 +0000 Subject: replace get_prev_events_and_hashes_for_room with get_prev_events_for_room in create_new_client_event --- .../storage/data_stores/main/event_federation.py | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'synapse/storage') diff --git a/synapse/storage/data_stores/main/event_federation.py b/synapse/storage/data_stores/main/event_federation.py index 266fc9715f..88e6489576 100644 --- a/synapse/storage/data_stores/main/event_federation.py +++ b/synapse/storage/data_stores/main/event_federation.py @@ -177,6 +177,41 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas return res + def get_prev_events_for_room(self, room_id: str): + """ + Gets a subset of the current forward extremities in the given room. + + Limits the result to 10 extremities, so that we can avoid creating + events which refer to hundreds of prev_events. + + Args: + room_id (str): room_id + + Returns: + Deferred[List[str]]: the event ids of the forward extremites + + """ + + return self.db.runInteraction( + "get_prev_events_for_room", self._get_prev_events_for_room_txn, room_id + ) + + def _get_prev_events_for_room_txn(self, txn, room_id: str): + # we just use the 10 newest events. Older events will become + # prev_events of future events. + + sql = """ + SELECT e.event_id FROM event_forward_extremities AS f + INNER JOIN events AS e USING (event_id) + WHERE f.room_id = ? + ORDER BY e.depth DESC + LIMIT 10 + """ + + txn.execute(sql, (room_id,)) + + return [row[0] for row in txn] + def get_latest_event_ids_and_hashes_in_room(self, room_id): """ Gets the current forward extremities in the given room -- cgit 1.4.1