296 lines
12 KiB
Python
296 lines
12 KiB
Python
# Copyright 2018-2021 The Matrix.org Foundation C.I.C.
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# Copyright 2020 Sorunome
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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 logging
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from collections import Counter
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from typing import TYPE_CHECKING, Any, Dict, Iterable, Optional, Tuple
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from typing_extensions import Counter as CounterType
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from synapse.api.constants import EventContentFields, EventTypes, Membership
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from synapse.metrics import event_processing_positions
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.types import JsonDict
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class StatsHandler:
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"""Handles keeping the *_stats tables updated with a simple time-series of
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information about the users, rooms and media on the server, such that admins
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have some idea of who is consuming their resources.
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Heavily derived from UserDirectoryHandler
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"""
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def __init__(self, hs: "HomeServer"):
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self.hs = hs
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self.store = hs.get_datastores().main
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self.state = hs.get_state_handler()
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self.server_name = hs.hostname
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self.clock = hs.get_clock()
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self.notifier = hs.get_notifier()
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self.is_mine_id = hs.is_mine_id
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self.stats_enabled = hs.config.stats.stats_enabled
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# The current position in the current_state_delta stream
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self.pos: Optional[int] = None
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# Guard to ensure we only process deltas one at a time
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self._is_processing = False
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if self.stats_enabled and hs.config.worker.run_background_tasks:
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self.notifier.add_replication_callback(self.notify_new_event)
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# We kick this off so that we don't have to wait for a change before
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# we start populating stats
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self.clock.call_later(0, self.notify_new_event)
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def notify_new_event(self) -> None:
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"""Called when there may be more deltas to process"""
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if not self.stats_enabled or self._is_processing:
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return
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self._is_processing = True
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async def process() -> None:
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try:
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await self._unsafe_process()
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finally:
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self._is_processing = False
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run_as_background_process("stats.notify_new_event", process)
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async def _unsafe_process(self) -> None:
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# If self.pos is None then means we haven't fetched it from DB
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if self.pos is None:
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self.pos = await self.store.get_stats_positions()
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room_max_stream_ordering = self.store.get_room_max_stream_ordering()
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if self.pos > room_max_stream_ordering:
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# apparently, we've processed more events than exist in the database!
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# this can happen if events are removed with history purge or similar.
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logger.warning(
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"Event stream ordering appears to have gone backwards (%i -> %i): "
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"rewinding stats processor",
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self.pos,
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room_max_stream_ordering,
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)
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self.pos = room_max_stream_ordering
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# Loop round handling deltas until we're up to date
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while True:
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# Be sure to read the max stream_ordering *before* checking if there are any outstanding
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# deltas, since there is otherwise a chance that we could miss updates which arrive
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# after we check the deltas.
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room_max_stream_ordering = self.store.get_room_max_stream_ordering()
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if self.pos == room_max_stream_ordering:
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break
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logger.debug(
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"Processing room stats %s->%s", self.pos, room_max_stream_ordering
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)
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max_pos, deltas = await self.store.get_current_state_deltas(
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self.pos, room_max_stream_ordering
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)
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if deltas:
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logger.debug("Handling %d state deltas", len(deltas))
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room_deltas, user_deltas = await self._handle_deltas(deltas)
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else:
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room_deltas = {}
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user_deltas = {}
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logger.debug("room_deltas: %s", room_deltas)
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logger.debug("user_deltas: %s", user_deltas)
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# Always call this so that we update the stats position.
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await self.store.bulk_update_stats_delta(
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self.clock.time_msec(),
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updates={"room": room_deltas, "user": user_deltas},
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stream_id=max_pos,
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)
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logger.debug("Handled room stats to %s -> %s", self.pos, max_pos)
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event_processing_positions.labels("stats").set(max_pos)
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self.pos = max_pos
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async def _handle_deltas(
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self, deltas: Iterable[JsonDict]
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) -> Tuple[Dict[str, CounterType[str]], Dict[str, CounterType[str]]]:
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"""Called with the state deltas to process
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Returns:
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Two dicts: the room deltas and the user deltas,
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mapping from room/user ID to changes in the various fields.
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"""
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room_to_stats_deltas: Dict[str, CounterType[str]] = {}
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user_to_stats_deltas: Dict[str, CounterType[str]] = {}
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room_to_state_updates: Dict[str, Dict[str, Any]] = {}
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for delta in deltas:
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typ = delta["type"]
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state_key = delta["state_key"]
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room_id = delta["room_id"]
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event_id = delta["event_id"]
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stream_id = delta["stream_id"]
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prev_event_id = delta["prev_event_id"]
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logger.debug("Handling: %r, %r %r, %s", room_id, typ, state_key, event_id)
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token = await self.store.get_earliest_token_for_stats("room", room_id)
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# If the earliest token to begin from is larger than our current
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# stream ID, skip processing this delta.
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if token is not None and token >= stream_id:
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logger.debug(
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"Ignoring: %s as earlier than this room's initial ingestion event",
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event_id,
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)
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continue
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if event_id is None and prev_event_id is None:
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logger.error(
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"event ID is None and so is the previous event ID. stream_id: %s",
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stream_id,
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)
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continue
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event_content: JsonDict = {}
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if event_id is not None:
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event = await self.store.get_event(event_id, allow_none=True)
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if event:
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event_content = event.content or {}
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# All the values in this dict are deltas (RELATIVE changes)
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room_stats_delta = room_to_stats_deltas.setdefault(room_id, Counter())
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room_state = room_to_state_updates.setdefault(room_id, {})
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if prev_event_id is None:
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# this state event doesn't overwrite another,
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# so it is a new effective/current state event
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room_stats_delta["current_state_events"] += 1
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if typ == EventTypes.Member:
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# we could use StateDeltasHandler._get_key_change here but it's
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# a bit inefficient given we're not testing for a specific
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# result; might as well just grab the prev_membership and
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# membership strings and compare them.
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# We take None rather than leave as a previous membership
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# in the absence of a previous event because we do not want to
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# reduce the leave count when a new-to-the-room user joins.
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prev_membership = None
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if prev_event_id is not None:
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prev_event = await self.store.get_event(
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prev_event_id, allow_none=True
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)
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if prev_event:
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prev_event_content = prev_event.content
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prev_membership = prev_event_content.get(
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"membership", Membership.LEAVE
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)
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membership = event_content.get("membership", Membership.LEAVE)
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if prev_membership is None:
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logger.debug("No previous membership for this user.")
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elif membership == prev_membership:
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pass # noop
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elif prev_membership == Membership.JOIN:
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room_stats_delta["joined_members"] -= 1
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elif prev_membership == Membership.INVITE:
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room_stats_delta["invited_members"] -= 1
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elif prev_membership == Membership.LEAVE:
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room_stats_delta["left_members"] -= 1
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elif prev_membership == Membership.BAN:
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room_stats_delta["banned_members"] -= 1
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elif prev_membership == Membership.KNOCK:
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room_stats_delta["knocked_members"] -= 1
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else:
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raise ValueError(
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"%r is not a valid prev_membership" % (prev_membership,)
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)
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if membership == prev_membership:
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pass # noop
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elif membership == Membership.JOIN:
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room_stats_delta["joined_members"] += 1
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elif membership == Membership.INVITE:
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room_stats_delta["invited_members"] += 1
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elif membership == Membership.LEAVE:
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room_stats_delta["left_members"] += 1
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elif membership == Membership.BAN:
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room_stats_delta["banned_members"] += 1
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elif membership == Membership.KNOCK:
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room_stats_delta["knocked_members"] += 1
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else:
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raise ValueError("%r is not a valid membership" % (membership,))
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user_id = state_key
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if self.is_mine_id(user_id):
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# this accounts for transitions like leave → ban and so on.
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has_changed_joinedness = (prev_membership == Membership.JOIN) != (
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membership == Membership.JOIN
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)
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if has_changed_joinedness:
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membership_delta = +1 if membership == Membership.JOIN else -1
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user_to_stats_deltas.setdefault(user_id, Counter())[
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"joined_rooms"
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] += membership_delta
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room_stats_delta["local_users_in_room"] += membership_delta
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elif typ == EventTypes.Create:
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room_state["is_federatable"] = (
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event_content.get(EventContentFields.FEDERATE, True) is True
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)
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elif typ == EventTypes.JoinRules:
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room_state["join_rules"] = event_content.get("join_rule")
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elif typ == EventTypes.RoomHistoryVisibility:
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room_state["history_visibility"] = event_content.get(
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"history_visibility"
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)
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elif typ == EventTypes.RoomEncryption:
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room_state["encryption"] = event_content.get("algorithm")
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elif typ == EventTypes.Name:
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room_state["name"] = event_content.get("name")
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elif typ == EventTypes.Topic:
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room_state["topic"] = event_content.get("topic")
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elif typ == EventTypes.RoomAvatar:
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room_state["avatar"] = event_content.get("url")
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elif typ == EventTypes.CanonicalAlias:
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room_state["canonical_alias"] = event_content.get("alias")
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elif typ == EventTypes.GuestAccess:
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room_state["guest_access"] = event_content.get(
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EventContentFields.GUEST_ACCESS
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)
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for room_id, state in room_to_state_updates.items():
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logger.debug("Updating room_stats_state for %s: %s", room_id, state)
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await self.store.update_room_state(room_id, state)
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return room_to_stats_deltas, user_to_stats_deltas
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