diff options
Diffstat (limited to 'synapse/handlers/room_member.py')
| -rw-r--r-- | synapse/handlers/room_member.py | 173 |
1 files changed, 154 insertions, 19 deletions
diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py index ed805d6ec8..fbef600acd 100644 --- a/synapse/handlers/room_member.py +++ b/synapse/handlers/room_member.py @@ -16,7 +16,7 @@ import abc import logging import random from http import HTTPStatus -from typing import TYPE_CHECKING, Iterable, List, Optional, Set, Tuple +from typing import TYPE_CHECKING, Any, Dict, Iterable, List, Optional, Set, Tuple from synapse import types from synapse.api.constants import ( @@ -38,7 +38,10 @@ from synapse.event_auth import get_named_level, get_power_level_event from synapse.events import EventBase from synapse.events.snapshot import EventContext from synapse.handlers.profile import MAX_AVATAR_URL_LEN, MAX_DISPLAYNAME_LEN +from synapse.handlers.state_deltas import MatchChange, StateDeltasHandler from synapse.logging import opentracing +from synapse.metrics import event_processing_positions +from synapse.metrics.background_process_metrics import run_as_background_process from synapse.module_api import NOT_SPAM from synapse.types import ( JsonDict, @@ -280,9 +283,25 @@ class RoomMemberHandler(metaclass=abc.ABCMeta): """ raise NotImplementedError() - @abc.abstractmethod async def forget(self, user: UserID, room_id: str) -> None: - raise NotImplementedError() + user_id = user.to_string() + + member = await self._storage_controllers.state.get_current_state_event( + room_id=room_id, event_type=EventTypes.Member, state_key=user_id + ) + membership = member.membership if member else None + + if membership is not None and membership not in [ + Membership.LEAVE, + Membership.BAN, + ]: + raise SynapseError(400, "User %s in room %s" % (user_id, room_id)) + + # In normal case this call is only required if `membership` is not `None`. + # But: After the last member had left the room, the background update + # `_background_remove_left_rooms` is deleting rows related to this room from + # the table `current_state_events` and `get_current_state_events` is `None`. + await self.store.forget(user_id, room_id) async def ratelimit_multiple_invites( self, @@ -2046,25 +2065,141 @@ class RoomMemberMasterHandler(RoomMemberHandler): """Implements RoomMemberHandler._user_left_room""" user_left_room(self.distributor, target, room_id) - async def forget(self, user: UserID, room_id: str) -> None: - user_id = user.to_string() - member = await self._storage_controllers.state.get_current_state_event( - room_id=room_id, event_type=EventTypes.Member, state_key=user_id - ) - membership = member.membership if member else None +class RoomForgetterHandler(StateDeltasHandler): + """Forgets rooms when they are left, when enabled in the homeserver config. - if membership is not None and membership not in [ - Membership.LEAVE, - Membership.BAN, - ]: - raise SynapseError(400, "User %s in room %s" % (user_id, room_id)) + For the purposes of this feature, kicks, bans and "leaves" via state resolution + weirdness are all considered to be leaves. - # In normal case this call is only required if `membership` is not `None`. - # But: After the last member had left the room, the background update - # `_background_remove_left_rooms` is deleting rows related to this room from - # the table `current_state_events` and `get_current_state_events` is `None`. - await self.store.forget(user_id, room_id) + Derived from `StatsHandler` and `UserDirectoryHandler`. + """ + + def __init__(self, hs: "HomeServer"): + super().__init__(hs) + + self._hs = hs + self._store = hs.get_datastores().main + self._storage_controllers = hs.get_storage_controllers() + self._clock = hs.get_clock() + self._notifier = hs.get_notifier() + self._room_member_handler = hs.get_room_member_handler() + + # The current position in the current_state_delta stream + self.pos: Optional[int] = None + + # Guard to ensure we only process deltas one at a time + self._is_processing = False + + if hs.config.worker.run_background_tasks: + self._notifier.add_replication_callback(self.notify_new_event) + + # We kick this off to pick up outstanding work from before the last restart. + self._clock.call_later(0, self.notify_new_event) + + def notify_new_event(self) -> None: + """Called when there may be more deltas to process""" + if self._is_processing: + return + + self._is_processing = True + + async def process() -> None: + try: + await self._unsafe_process() + finally: + self._is_processing = False + + run_as_background_process("room_forgetter.notify_new_event", process) + + async def _unsafe_process(self) -> None: + # If self.pos is None then means we haven't fetched it from DB + if self.pos is None: + self.pos = await self._store.get_room_forgetter_stream_pos() + room_max_stream_ordering = self._store.get_room_max_stream_ordering() + if self.pos > room_max_stream_ordering: + # apparently, we've processed more events than exist in the database! + # this can happen if events are removed with history purge or similar. + logger.warning( + "Event stream ordering appears to have gone backwards (%i -> %i): " + "rewinding room forgetter processor", + self.pos, + room_max_stream_ordering, + ) + self.pos = room_max_stream_ordering + + if not self._hs.config.room.forget_on_leave: + # Update the processing position, so that if the server admin turns the + # feature on at a later date, we don't decide to forget every room that + # has ever been left in the past. + self.pos = self._store.get_room_max_stream_ordering() + await self._store.update_room_forgetter_stream_pos(self.pos) + return + + # Loop round handling deltas until we're up to date + + while True: + # Be sure to read the max stream_ordering *before* checking if there are any outstanding + # deltas, since there is otherwise a chance that we could miss updates which arrive + # after we check the deltas. + room_max_stream_ordering = self._store.get_room_max_stream_ordering() + if self.pos == room_max_stream_ordering: + break + + logger.debug( + "Processing room forgetting %s->%s", self.pos, room_max_stream_ordering + ) + ( + max_pos, + deltas, + ) = await self._storage_controllers.state.get_current_state_deltas( + self.pos, room_max_stream_ordering + ) + + logger.debug("Handling %d state deltas", len(deltas)) + await self._handle_deltas(deltas) + + self.pos = max_pos + + # Expose current event processing position to prometheus + event_processing_positions.labels("room_forgetter").set(max_pos) + + await self._store.update_room_forgetter_stream_pos(max_pos) + + async def _handle_deltas(self, deltas: List[Dict[str, Any]]) -> None: + """Called with the state deltas to process""" + for delta in deltas: + typ = delta["type"] + state_key = delta["state_key"] + room_id = delta["room_id"] + event_id = delta["event_id"] + prev_event_id = delta["prev_event_id"] + + if typ != EventTypes.Member: + continue + + if not self._hs.is_mine_id(state_key): + continue + + change = await self._get_key_change( + prev_event_id, + event_id, + key_name="membership", + public_value=Membership.JOIN, + ) + is_leave = change is MatchChange.now_false + + if is_leave: + try: + await self._room_member_handler.forget( + UserID.from_string(state_key), room_id + ) + except SynapseError as e: + if e.code == 400: + # The user is back in the room. + pass + else: + raise def get_users_which_can_issue_invite(auth_events: StateMap[EventBase]) -> List[str]: |