510 lines
18 KiB
Python
510 lines
18 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import collections.abc
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import logging
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from collections import namedtuple
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from typing import Iterable, Optional, Set
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import NotFoundError, UnsupportedRoomVersionError
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from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion
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from synapse.events import EventBase
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from synapse.storage._base import SQLBaseStore
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from synapse.storage.database import DatabasePool
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from synapse.storage.databases.main.events_worker import EventsWorkerStore
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from synapse.storage.databases.main.roommember import RoomMemberWorkerStore
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from synapse.storage.state import StateFilter
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from synapse.types import StateMap
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from synapse.util.caches import intern_string
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from synapse.util.caches.descriptors import cached, cachedList
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logger = logging.getLogger(__name__)
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MAX_STATE_DELTA_HOPS = 100
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class _GetStateGroupDelta(
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namedtuple("_GetStateGroupDelta", ("prev_group", "delta_ids"))
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):
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"""Return type of get_state_group_delta that implements __len__, which lets
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us use the itrable flag when caching
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"""
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__slots__ = []
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def __len__(self):
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return len(self.delta_ids) if self.delta_ids else 0
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# this inherits from EventsWorkerStore because it calls self.get_events
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class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
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"""The parts of StateGroupStore that can be called from workers."""
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def __init__(self, database: DatabasePool, db_conn, hs):
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super().__init__(database, db_conn, hs)
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async def get_room_version(self, room_id: str) -> RoomVersion:
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"""Get the room_version of a given room
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Raises:
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NotFoundError: if the room is unknown
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UnsupportedRoomVersionError: if the room uses an unknown room version.
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Typically this happens if support for the room's version has been
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removed from Synapse.
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"""
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room_version_id = await self.get_room_version_id(room_id)
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v = KNOWN_ROOM_VERSIONS.get(room_version_id)
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if not v:
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raise UnsupportedRoomVersionError(
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"Room %s uses a room version %s which is no longer supported"
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% (room_id, room_version_id)
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)
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return v
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@cached(max_entries=10000)
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async def get_room_version_id(self, room_id: str) -> str:
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"""Get the room_version of a given room
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Raises:
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NotFoundError: if the room is unknown
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"""
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# First we try looking up room version from the database, but for old
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# rooms we might not have added the room version to it yet so we fall
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# back to previous behaviour and look in current state events.
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# We really should have an entry in the rooms table for every room we
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# care about, but let's be a bit paranoid (at least while the background
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# update is happening) to avoid breaking existing rooms.
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version = await self.db_pool.simple_select_one_onecol(
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table="rooms",
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keyvalues={"room_id": room_id},
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retcol="room_version",
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desc="get_room_version",
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allow_none=True,
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)
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if version is not None:
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return version
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# Retrieve the room's create event
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create_event = await self.get_create_event_for_room(room_id)
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return create_event.content.get("room_version", "1")
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async def get_room_predecessor(self, room_id: str) -> Optional[dict]:
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"""Get the predecessor of an upgraded room if it exists.
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Otherwise return None.
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Args:
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room_id: The room ID.
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Returns:
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A dictionary containing the structure of the predecessor
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field from the room's create event. The structure is subject to other servers,
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but it is expected to be:
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* room_id (str): The room ID of the predecessor room
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* event_id (str): The ID of the tombstone event in the predecessor room
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None if a predecessor key is not found, or is not a dictionary.
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Raises:
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NotFoundError if the given room is unknown
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"""
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# Retrieve the room's create event
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create_event = await self.get_create_event_for_room(room_id)
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# Retrieve the predecessor key of the create event
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predecessor = create_event.content.get("predecessor", None)
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# Ensure the key is a dictionary
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if not isinstance(predecessor, collections.abc.Mapping):
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return None
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return predecessor
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async def get_create_event_for_room(self, room_id: str) -> EventBase:
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"""Get the create state event for a room.
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Args:
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room_id: The room ID.
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Returns:
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The room creation event.
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Raises:
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NotFoundError if the room is unknown
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"""
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state_ids = await self.get_current_state_ids(room_id)
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create_id = state_ids.get((EventTypes.Create, ""))
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# If we can't find the create event, assume we've hit a dead end
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if not create_id:
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raise NotFoundError("Unknown room %s" % (room_id,))
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# Retrieve the room's create event and return
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create_event = await self.get_event(create_id)
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return create_event
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@cached(max_entries=100000, iterable=True)
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async def get_current_state_ids(self, room_id: str) -> StateMap[str]:
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"""Get the current state event ids for a room based on the
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current_state_events table.
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Args:
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room_id: The room to get the state IDs of.
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Returns:
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The current state of the room.
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"""
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def _get_current_state_ids_txn(txn):
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txn.execute(
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"""SELECT type, state_key, event_id FROM current_state_events
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WHERE room_id = ?
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""",
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(room_id,),
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)
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return {(intern_string(r[0]), intern_string(r[1])): r[2] for r in txn}
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return await self.db_pool.runInteraction(
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"get_current_state_ids", _get_current_state_ids_txn
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)
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# FIXME: how should this be cached?
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async def get_filtered_current_state_ids(
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self, room_id: str, state_filter: Optional[StateFilter] = None
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) -> StateMap[str]:
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"""Get the current state event of a given type for a room based on the
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current_state_events table. This may not be as up-to-date as the result
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of doing a fresh state resolution as per state_handler.get_current_state
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Args:
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room_id
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state_filter: The state filter used to fetch state
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from the database.
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Returns:
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Map from type/state_key to event ID.
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"""
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where_clause, where_args = (
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state_filter or StateFilter.all()
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).make_sql_filter_clause()
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if not where_clause:
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# We delegate to the cached version
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return await self.get_current_state_ids(room_id)
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def _get_filtered_current_state_ids_txn(txn):
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results = {}
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sql = """
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SELECT type, state_key, event_id FROM current_state_events
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WHERE room_id = ?
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"""
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if where_clause:
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sql += " AND (%s)" % (where_clause,)
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args = [room_id]
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args.extend(where_args)
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txn.execute(sql, args)
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for row in txn:
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typ, state_key, event_id = row
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key = (intern_string(typ), intern_string(state_key))
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results[key] = event_id
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return results
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return await self.db_pool.runInteraction(
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"get_filtered_current_state_ids", _get_filtered_current_state_ids_txn
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)
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async def get_canonical_alias_for_room(self, room_id: str) -> Optional[str]:
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"""Get canonical alias for room, if any
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Args:
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room_id: The room ID
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Returns:
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The canonical alias, if any
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"""
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state = await self.get_filtered_current_state_ids(
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room_id, StateFilter.from_types([(EventTypes.CanonicalAlias, "")])
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)
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event_id = state.get((EventTypes.CanonicalAlias, ""))
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if not event_id:
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return
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event = await self.get_event(event_id, allow_none=True)
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if not event:
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return
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return event.content.get("canonical_alias")
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@cached(max_entries=50000)
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async def _get_state_group_for_event(self, event_id: str) -> Optional[int]:
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return await self.db_pool.simple_select_one_onecol(
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table="event_to_state_groups",
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keyvalues={"event_id": event_id},
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retcol="state_group",
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allow_none=True,
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desc="_get_state_group_for_event",
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)
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@cachedList(
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cached_method_name="_get_state_group_for_event",
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list_name="event_ids",
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num_args=1,
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)
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async def _get_state_group_for_events(self, event_ids):
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"""Returns mapping event_id -> state_group"""
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rows = await self.db_pool.simple_select_many_batch(
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table="event_to_state_groups",
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column="event_id",
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iterable=event_ids,
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keyvalues={},
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retcols=("event_id", "state_group"),
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desc="_get_state_group_for_events",
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)
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return {row["event_id"]: row["state_group"] for row in rows}
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async def get_referenced_state_groups(
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self, state_groups: Iterable[int]
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) -> Set[int]:
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"""Check if the state groups are referenced by events.
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Args:
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state_groups
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Returns:
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The subset of state groups that are referenced.
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"""
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rows = await self.db_pool.simple_select_many_batch(
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table="event_to_state_groups",
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column="state_group",
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iterable=state_groups,
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keyvalues={},
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retcols=("DISTINCT state_group",),
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desc="get_referenced_state_groups",
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)
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return {row["state_group"] for row in rows}
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class MainStateBackgroundUpdateStore(RoomMemberWorkerStore):
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CURRENT_STATE_INDEX_UPDATE_NAME = "current_state_members_idx"
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EVENT_STATE_GROUP_INDEX_UPDATE_NAME = "event_to_state_groups_sg_index"
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DELETE_CURRENT_STATE_UPDATE_NAME = "delete_old_current_state_events"
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def __init__(self, database: DatabasePool, db_conn, hs):
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super().__init__(database, db_conn, hs)
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self.server_name = hs.hostname
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self.db_pool.updates.register_background_index_update(
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self.CURRENT_STATE_INDEX_UPDATE_NAME,
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index_name="current_state_events_member_index",
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table="current_state_events",
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columns=["state_key"],
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where_clause="type='m.room.member'",
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)
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self.db_pool.updates.register_background_index_update(
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self.EVENT_STATE_GROUP_INDEX_UPDATE_NAME,
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index_name="event_to_state_groups_sg_index",
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table="event_to_state_groups",
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columns=["state_group"],
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)
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self.db_pool.updates.register_background_update_handler(
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self.DELETE_CURRENT_STATE_UPDATE_NAME,
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self._background_remove_left_rooms,
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)
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async def _background_remove_left_rooms(self, progress, batch_size):
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"""Background update to delete rows from `current_state_events` and
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`event_forward_extremities` tables of rooms that the server is no
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longer joined to.
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"""
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last_room_id = progress.get("last_room_id", "")
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def _background_remove_left_rooms_txn(txn):
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# get a batch of room ids to consider
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sql = """
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SELECT DISTINCT room_id FROM current_state_events
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WHERE room_id > ? ORDER BY room_id LIMIT ?
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"""
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txn.execute(sql, (last_room_id, batch_size))
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room_ids = [row[0] for row in txn]
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if not room_ids:
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return True, set()
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###########################################################################
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#
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# exclude rooms where we have active members
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sql = """
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SELECT room_id
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FROM local_current_membership
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WHERE
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room_id > ? AND room_id <= ?
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AND membership = 'join'
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GROUP BY room_id
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"""
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txn.execute(sql, (last_room_id, room_ids[-1]))
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joined_room_ids = {row[0] for row in txn}
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to_delete = set(room_ids) - joined_room_ids
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###########################################################################
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#
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# exclude rooms which we are in the process of constructing; these otherwise
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# qualify as "rooms with no local users", and would have their
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# forward extremities cleaned up.
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# the following query will return a list of rooms which have forward
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# extremities that are *not* also the create event in the room - ie
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# those that are not being created currently.
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sql = """
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SELECT DISTINCT efe.room_id
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FROM event_forward_extremities efe
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LEFT JOIN current_state_events cse ON
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cse.event_id = efe.event_id
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AND cse.type = 'm.room.create'
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AND cse.state_key = ''
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WHERE
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cse.event_id IS NULL
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AND efe.room_id > ? AND efe.room_id <= ?
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"""
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txn.execute(sql, (last_room_id, room_ids[-1]))
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# build a set of those rooms within `to_delete` that do not appear in
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# the above, leaving us with the rooms in `to_delete` that *are* being
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# created.
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creating_rooms = to_delete.difference(row[0] for row in txn)
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logger.info("skipping rooms which are being created: %s", creating_rooms)
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# now remove the rooms being created from the list of those to delete.
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#
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# (we could have just taken the intersection of `to_delete` with the result
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# of the sql query, but it's useful to be able to log `creating_rooms`; and
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# having done so, it's quicker to remove the (few) creating rooms from
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# `to_delete` than it is to form the intersection with the (larger) list of
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# not-creating-rooms)
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to_delete -= creating_rooms
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###########################################################################
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#
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# now clear the state for the rooms
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logger.info("Deleting current state left rooms: %r", to_delete)
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# First we get all users that we still think were joined to the
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# room. This is so that we can mark those device lists as
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# potentially stale, since there may have been a period where the
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# server didn't share a room with the remote user and therefore may
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# have missed any device updates.
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rows = self.db_pool.simple_select_many_txn(
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txn,
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table="current_state_events",
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column="room_id",
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iterable=to_delete,
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keyvalues={"type": EventTypes.Member, "membership": Membership.JOIN},
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retcols=("state_key",),
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)
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potentially_left_users = {row["state_key"] for row in rows}
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# Now lets actually delete the rooms from the DB.
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self.db_pool.simple_delete_many_txn(
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txn,
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table="current_state_events",
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column="room_id",
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iterable=to_delete,
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keyvalues={},
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)
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self.db_pool.simple_delete_many_txn(
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txn,
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table="event_forward_extremities",
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column="room_id",
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iterable=to_delete,
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keyvalues={},
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)
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self.db_pool.updates._background_update_progress_txn(
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txn,
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self.DELETE_CURRENT_STATE_UPDATE_NAME,
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{"last_room_id": room_ids[-1]},
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)
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return False, potentially_left_users
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finished, potentially_left_users = await self.db_pool.runInteraction(
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"_background_remove_left_rooms", _background_remove_left_rooms_txn
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)
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if finished:
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await self.db_pool.updates._end_background_update(
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self.DELETE_CURRENT_STATE_UPDATE_NAME
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)
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# Now go and check if we still share a room with the remote users in
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# the deleted rooms. If not mark their device lists as stale.
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joined_users = await self.get_users_server_still_shares_room_with(
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potentially_left_users
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)
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for user_id in potentially_left_users - joined_users:
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await self.mark_remote_user_device_list_as_unsubscribed(user_id)
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return batch_size
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class StateStore(StateGroupWorkerStore, MainStateBackgroundUpdateStore):
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"""Keeps track of the state at a given event.
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This is done by the concept of `state groups`. Every event is a assigned
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a state group (identified by an arbitrary string), which references a
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collection of state events. The current state of an event is then the
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collection of state events referenced by the event's state group.
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Hence, every change in the current state causes a new state group to be
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generated. However, if no change happens (e.g., if we get a message event
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with only one parent it inherits the state group from its parent.)
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There are three tables:
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* `state_groups`: Stores group name, first event with in the group and
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room id.
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* `event_to_state_groups`: Maps events to state groups.
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* `state_groups_state`: Maps state group to state events.
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"""
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def __init__(self, database: DatabasePool, db_conn, hs):
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super().__init__(database, db_conn, hs)
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