mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-12-24 00:49:22 -05:00
118 lines
3.9 KiB
Python
118 lines
3.9 KiB
Python
# -*- coding: utf-8 -*-
|
|
# 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 twisted.internet import defer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class PurgeEventsStorage(object):
|
|
"""High level interface for purging rooms and event history.
|
|
"""
|
|
|
|
def __init__(self, hs, stores):
|
|
self.stores = stores
|
|
|
|
@defer.inlineCallbacks
|
|
def purge_room(self, room_id: str):
|
|
"""Deletes all record of a room
|
|
"""
|
|
|
|
state_groups_to_delete = yield self.stores.main.purge_room(room_id)
|
|
yield self.stores.state.purge_room_state(room_id, state_groups_to_delete)
|
|
|
|
@defer.inlineCallbacks
|
|
def purge_history(self, room_id, token, delete_local_events):
|
|
"""Deletes room history before a certain point
|
|
|
|
Args:
|
|
room_id (str):
|
|
|
|
token (str): A topological token to delete events before
|
|
|
|
delete_local_events (bool):
|
|
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 = yield self.stores.main.purge_history(
|
|
room_id, token, delete_local_events
|
|
)
|
|
|
|
logger.info("[purge] finding state groups that can be deleted")
|
|
|
|
sg_to_delete = yield self._find_unreferenced_groups(state_groups)
|
|
|
|
yield self.stores.state.purge_unreferenced_state_groups(room_id, sg_to_delete)
|
|
|
|
@defer.inlineCallbacks
|
|
def _find_unreferenced_groups(self, state_groups):
|
|
"""Used when purging history to figure out which state groups can be
|
|
deleted.
|
|
|
|
Args:
|
|
state_groups (set[int]): Set of state groups referenced by events
|
|
that are going to be deleted.
|
|
|
|
Returns:
|
|
Deferred[set[int]] The set of state groups that can be deleted.
|
|
"""
|
|
# Graph of state group -> previous group
|
|
graph = {}
|
|
|
|
# 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 = yield 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 = yield 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
|
|
|
|
graph.update(edges)
|
|
|
|
to_delete = state_groups_seen - referenced_groups
|
|
|
|
return to_delete
|