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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2021 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import logging
from typing import List, Optional, Tuple, cast
from synapse.api.errors import SynapseError
from synapse.storage.database import LoggingTransaction
from synapse.storage.databases.main import CacheInvalidationWorkerStore
from synapse.storage.databases.main.event_federation import EventFederationWorkerStore
logger = logging.getLogger(__name__)
class EventForwardExtremitiesStore(
EventFederationWorkerStore,
CacheInvalidationWorkerStore,
):
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: LoggingTransaction) -> int:
# 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))
deleted_count = txn.rowcount
logger.info(
"Deleted %s extra forward extremities for room %s",
deleted_count,
room_id,
)
if deleted_count > 0:
# Invalidate the cache
self._invalidate_cache_and_stream(
txn,
self.get_latest_event_ids_in_room,
(room_id,),
)
return deleted_count
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[Tuple[str, int, int, Optional[int]]]:
"""
Get list of forward extremities for a room.
Returns:
A list of tuples of event_id, state_group, depth, and received_ts.
"""
def get_forward_extremities_for_room_txn(
txn: LoggingTransaction,
) -> List[Tuple[str, int, int, Optional[int]]]:
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 cast(List[Tuple[str, int, int, Optional[int]]], txn.fetchall())
return await self.db_pool.runInteraction(
"get_forward_extremities_for_room",
get_forward_extremities_for_room_txn,
)
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