mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-11 05:04:19 -05:00
4b965c862d
Part of #9744 Removes all redundant `# -*- coding: utf-8 -*-` lines from files, as python 3 automatically reads source code as utf-8 now. `Signed-off-by: Jonathan de Jong <jonathan@automatia.nl>`
113 lines
3.9 KiB
Python
113 lines
3.9 KiB
Python
# Copyright 2019 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 itertools
|
|
import logging
|
|
from typing import TYPE_CHECKING, Set
|
|
|
|
from synapse.storage.databases import Databases
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.server import HomeServer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class PurgeEventsStorage:
|
|
"""High level interface for purging rooms and event history."""
|
|
|
|
def __init__(self, hs: "HomeServer", stores: Databases):
|
|
self.stores = stores
|
|
|
|
async def purge_room(self, room_id: str) -> None:
|
|
"""Deletes all record of a room"""
|
|
|
|
state_groups_to_delete = await self.stores.main.purge_room(room_id)
|
|
await self.stores.state.purge_room_state(room_id, state_groups_to_delete)
|
|
|
|
async def purge_history(
|
|
self, room_id: str, token: str, delete_local_events: bool
|
|
) -> None:
|
|
"""Deletes room history before a certain point
|
|
|
|
Args:
|
|
room_id: The room ID
|
|
|
|
token: A topological token to delete events before
|
|
|
|
delete_local_events:
|
|
if True, we will delete local events as well as remote ones
|
|
(instead of just marking them as outliers and deleting their
|
|
state groups).
|
|
"""
|
|
state_groups = await self.stores.main.purge_history(
|
|
room_id, token, delete_local_events
|
|
)
|
|
|
|
logger.info("[purge] finding state groups that can be deleted")
|
|
|
|
sg_to_delete = await self._find_unreferenced_groups(state_groups)
|
|
|
|
await self.stores.state.purge_unreferenced_state_groups(room_id, sg_to_delete)
|
|
|
|
async def _find_unreferenced_groups(self, state_groups: Set[int]) -> Set[int]:
|
|
"""Used when purging history to figure out which state groups can be
|
|
deleted.
|
|
|
|
Args:
|
|
state_groups: Set of state groups referenced by events
|
|
that are going to be deleted.
|
|
|
|
Returns:
|
|
The set of state groups that can be deleted.
|
|
"""
|
|
# Set of events that we have found to be referenced by events
|
|
referenced_groups = set()
|
|
|
|
# Set of state groups we've already seen
|
|
state_groups_seen = set(state_groups)
|
|
|
|
# Set of state groups to handle next.
|
|
next_to_search = set(state_groups)
|
|
while next_to_search:
|
|
# We bound size of groups we're looking up at once, to stop the
|
|
# SQL query getting too big
|
|
if len(next_to_search) < 100:
|
|
current_search = next_to_search
|
|
next_to_search = set()
|
|
else:
|
|
current_search = set(itertools.islice(next_to_search, 100))
|
|
next_to_search -= current_search
|
|
|
|
referenced = await self.stores.main.get_referenced_state_groups(
|
|
current_search
|
|
)
|
|
referenced_groups |= referenced
|
|
|
|
# We don't continue iterating up the state group graphs for state
|
|
# groups that are referenced.
|
|
current_search -= referenced
|
|
|
|
edges = await self.stores.state.get_previous_state_groups(current_search)
|
|
|
|
prevs = set(edges.values())
|
|
# We don't bother re-handling groups we've already seen
|
|
prevs -= state_groups_seen
|
|
next_to_search |= prevs
|
|
state_groups_seen |= prevs
|
|
|
|
to_delete = state_groups_seen - referenced_groups
|
|
|
|
return to_delete
|