# Copyright 2018-2021 The Matrix.org Foundation C.I.C. # Copyright 2020 Sorunome # # 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 logging from collections import Counter from typing import TYPE_CHECKING, Any, Dict, Iterable, Optional, Tuple from typing_extensions import Counter as CounterType from synapse.api.constants import EventContentFields, EventTypes, Membership from synapse.metrics import event_processing_positions from synapse.metrics.background_process_metrics import run_as_background_process from synapse.types import JsonDict if TYPE_CHECKING: from synapse.server import HomeServer logger = logging.getLogger(__name__) class StatsHandler: """Handles keeping the *_stats tables updated with a simple time-series of information about the users, rooms and media on the server, such that admins have some idea of who is consuming their resources. Heavily derived from UserDirectoryHandler """ def __init__(self, hs: "HomeServer"): self.hs = hs self.store = hs.get_datastore() self.state = hs.get_state_handler() self.server_name = hs.hostname self.clock = hs.get_clock() self.notifier = hs.get_notifier() self.is_mine_id = hs.is_mine_id self.stats_enabled = hs.config.stats_enabled # 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 self.stats_enabled and hs.config.run_background_tasks: self.notifier.add_replication_callback(self.notify_new_event) # We kick this off so that we don't have to wait for a change before # we start populating stats 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 not self.stats_enabled or self._is_processing: return self._is_processing = True async def process(): try: await self._unsafe_process() finally: self._is_processing = False run_as_background_process("stats.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_stats_positions() # 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 stats %s->%s", self.pos, room_max_stream_ordering ) max_pos, deltas = await self.store.get_current_state_deltas( self.pos, room_max_stream_ordering ) if deltas: logger.debug("Handling %d state deltas", len(deltas)) room_deltas, user_deltas = await self._handle_deltas(deltas) else: room_deltas = {} user_deltas = {} logger.debug("room_deltas: %s", room_deltas) logger.debug("user_deltas: %s", user_deltas) # Always call this so that we update the stats position. await self.store.bulk_update_stats_delta( self.clock.time_msec(), updates={"room": room_deltas, "user": user_deltas}, stream_id=max_pos, ) logger.debug("Handled room stats to %s -> %s", self.pos, max_pos) event_processing_positions.labels("stats").set(max_pos) self.pos = max_pos async def _handle_deltas( self, deltas: Iterable[JsonDict] ) -> Tuple[Dict[str, CounterType[str]], Dict[str, CounterType[str]]]: """Called with the state deltas to process Returns: Two dicts: the room deltas and the user deltas, mapping from room/user ID to changes in the various fields. """ room_to_stats_deltas: Dict[str, CounterType[str]] = {} user_to_stats_deltas: Dict[str, CounterType[str]] = {} room_to_state_updates: Dict[str, Dict[str, Any]] = {} for delta in deltas: typ = delta["type"] state_key = delta["state_key"] room_id = delta["room_id"] event_id = delta["event_id"] stream_id = delta["stream_id"] prev_event_id = delta["prev_event_id"] logger.debug("Handling: %r, %r %r, %s", room_id, typ, state_key, event_id) token = await self.store.get_earliest_token_for_stats("room", room_id) # If the earliest token to begin from is larger than our current # stream ID, skip processing this delta. if token is not None and token >= stream_id: logger.debug( "Ignoring: %s as earlier than this room's initial ingestion event", event_id, ) continue if event_id is None and prev_event_id is None: logger.error( "event ID is None and so is the previous event ID. stream_id: %s", stream_id, ) continue event_content: JsonDict = {} if event_id is not None: event = await self.store.get_event(event_id, allow_none=True) if event: event_content = event.content or {} # All the values in this dict are deltas (RELATIVE changes) room_stats_delta = room_to_stats_deltas.setdefault(room_id, Counter()) room_state = room_to_state_updates.setdefault(room_id, {}) if prev_event_id is None: # this state event doesn't overwrite another, # so it is a new effective/current state event room_stats_delta["current_state_events"] += 1 if typ == EventTypes.Member: # we could use StateDeltasHandler._get_key_change here but it's # a bit inefficient given we're not testing for a specific # result; might as well just grab the prev_membership and # membership strings and compare them. # We take None rather than leave as a previous membership # in the absence of a previous event because we do not want to # reduce the leave count when a new-to-the-room user joins. prev_membership = None if prev_event_id is not None: prev_event = await self.store.get_event( prev_event_id, allow_none=True ) if prev_event: prev_event_content = prev_event.content prev_membership = prev_event_content.get( "membership", Membership.LEAVE ) membership = event_content.get("membership", Membership.LEAVE) if prev_membership is None: logger.debug("No previous membership for this user.") elif membership == prev_membership: pass # noop elif prev_membership == Membership.JOIN: room_stats_delta["joined_members"] -= 1 elif prev_membership == Membership.INVITE: room_stats_delta["invited_members"] -= 1 elif prev_membership == Membership.LEAVE: room_stats_delta["left_members"] -= 1 elif prev_membership == Membership.BAN: room_stats_delta["banned_members"] -= 1 elif prev_membership == Membership.KNOCK: room_stats_delta["knocked_members"] -= 1 else: raise ValueError( "%r is not a valid prev_membership" % (prev_membership,) ) if membership == prev_membership: pass # noop elif membership == Membership.JOIN: room_stats_delta["joined_members"] += 1 elif membership == Membership.INVITE: room_stats_delta["invited_members"] += 1 elif membership == Membership.LEAVE: room_stats_delta["left_members"] += 1 elif membership == Membership.BAN: room_stats_delta["banned_members"] += 1 elif membership == Membership.KNOCK: room_stats_delta["knocked_members"] += 1 else: raise ValueError("%r is not a valid membership" % (membership,)) user_id = state_key if self.is_mine_id(user_id): # this accounts for transitions like leave → ban and so on. has_changed_joinedness = (prev_membership == Membership.JOIN) != ( membership == Membership.JOIN ) if has_changed_joinedness: membership_delta = +1 if membership == Membership.JOIN else -1 user_to_stats_deltas.setdefault(user_id, Counter())[ "joined_rooms" ] += membership_delta room_stats_delta["local_users_in_room"] += membership_delta elif typ == EventTypes.Create: room_state["is_federatable"] = ( event_content.get("m.federate", True) is True ) elif typ == EventTypes.JoinRules: room_state["join_rules"] = event_content.get("join_rule") elif typ == EventTypes.RoomHistoryVisibility: room_state["history_visibility"] = event_content.get( "history_visibility" ) elif typ == EventTypes.RoomEncryption: room_state["encryption"] = event_content.get("algorithm") elif typ == EventTypes.Name: room_state["name"] = event_content.get("name") elif typ == EventTypes.Topic: room_state["topic"] = event_content.get("topic") elif typ == EventTypes.RoomAvatar: room_state["avatar"] = event_content.get("url") elif typ == EventTypes.CanonicalAlias: room_state["canonical_alias"] = event_content.get("alias") elif typ == EventTypes.GuestAccess: room_state["guest_access"] = event_content.get( EventContentFields.GUEST_ACCESS ) for room_id, state in room_to_state_updates.items(): logger.debug("Updating room_stats_state for %s: %s", room_id, state) await self.store.update_room_state(room_id, state) return room_to_stats_deltas, user_to_stats_deltas