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# -*- coding: utf-8 -*-
# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import Dict, List
from synapse.api.errors import SynapseError
from synapse.storage._base import SQLBaseStore
logger = logging.getLogger(__name__)
class EventForwardExtremitiesStore(SQLBaseStore):
async def delete_forward_extremities_for_room(self, room_id: str) -> int:
"""Delete any extra forward extremities for a room.
Invalidates the "get_latest_event_ids_in_room" cache if any forward
extremities were deleted.
Returns count deleted.
"""
def delete_forward_extremities_for_room_txn(txn):
# First we need to get the event_id to not delete
sql = """
SELECT event_id FROM event_forward_extremities
INNER JOIN events USING (room_id, event_id)
WHERE room_id = ?
ORDER BY stream_ordering DESC
LIMIT 1
"""
txn.execute(sql, (room_id,))
rows = txn.fetchall()
try:
event_id = rows[0][0]
logger.debug(
"Found event_id %s as the forward extremity to keep for room %s",
event_id,
room_id,
)
except KeyError:
msg = "No forward extremity event found for room %s" % room_id
logger.warning(msg)
raise SynapseError(400, msg)
# Now delete the extra forward extremities
sql = """
DELETE FROM event_forward_extremities
WHERE event_id != ? AND room_id = ?
"""
txn.execute(sql, (event_id, room_id))
logger.info(
"Deleted %s extra forward extremities for room %s",
txn.rowcount,
room_id,
)
if txn.rowcount > 0:
# Invalidate the cache
self._invalidate_cache_and_stream(
txn, self.get_latest_event_ids_in_room, (room_id,),
)
return txn.rowcount
return await self.db_pool.runInteraction(
"delete_forward_extremities_for_room",
delete_forward_extremities_for_room_txn,
)
async def get_forward_extremities_for_room(self, room_id: str) -> List[Dict]:
"""Get list of forward extremities for a room."""
def get_forward_extremities_for_room_txn(txn):
sql = """
SELECT event_id, state_group, depth, received_ts
FROM event_forward_extremities
INNER JOIN event_to_state_groups USING (event_id)
INNER JOIN events USING (room_id, event_id)
WHERE room_id = ?
"""
txn.execute(sql, (room_id,))
return self.db_pool.cursor_to_dict(txn)
return await self.db_pool.runInteraction(
"get_forward_extremities_for_room", get_forward_extremities_for_room_txn,
)
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