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Room Statistics (#4338)
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Amber Brown
GitHub
parent
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commit
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15 changed files with 1306 additions and 13 deletions
325
synapse/handlers/stats.py
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325
synapse/handlers/stats.py
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# -*- coding: utf-8 -*-
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# Copyright 2018 New Vector Ltd
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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 twisted.internet import defer
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from synapse.api.constants import EventTypes, JoinRules, Membership
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from synapse.handlers.state_deltas import StateDeltasHandler
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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 UserID
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from synapse.util.metrics import Measure
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logger = logging.getLogger(__name__)
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class StatsHandler(StateDeltasHandler):
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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):
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super(StatsHandler, self).__init__(hs)
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self.hs = hs
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self.store = hs.get_datastore()
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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_bucket_size = hs.config.stats_bucket_size
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# The current position in the current_state_delta stream
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self.pos = 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 hs.config.stats_enabled:
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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):
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"""Called when there may be more deltas to process
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"""
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if not self.hs.config.stats_enabled:
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return
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if self._is_processing:
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return
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@defer.inlineCallbacks
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def process():
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try:
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yield self._unsafe_process()
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finally:
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self._is_processing = False
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self._is_processing = True
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run_as_background_process("stats.notify_new_event", process)
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@defer.inlineCallbacks
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def _unsafe_process(self):
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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 = yield self.store.get_stats_stream_pos()
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# If still None then the initial background update hasn't happened yet
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if self.pos is None:
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defer.returnValue(None)
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# Loop round handling deltas until we're up to date
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while True:
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with Measure(self.clock, "stats_delta"):
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deltas = yield self.store.get_current_state_deltas(self.pos)
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if not deltas:
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return
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logger.info("Handling %d state deltas", len(deltas))
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yield self._handle_deltas(deltas)
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self.pos = deltas[-1]["stream_id"]
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yield self.store.update_stats_stream_pos(self.pos)
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event_processing_positions.labels("stats").set(self.pos)
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@defer.inlineCallbacks
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def _handle_deltas(self, deltas):
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"""
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Called with the state deltas to process
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"""
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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, %s", typ, state_key, event_id)
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token = yield self.store.get_earliest_token_for_room_stats(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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# Errr...
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continue
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event_content = {}
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if event_id is not None:
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event_content = (yield self.store.get_event(event_id)).content or {}
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# quantise time to the nearest bucket
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now = yield self.store.get_received_ts(event_id)
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now = (now // 1000 // self.stats_bucket_size) * self.stats_bucket_size
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if typ == EventTypes.Member:
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# we could use _get_key_change here but it's a bit inefficient
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# given we're not testing for a specific result; might as well
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# just grab the prev_membership and membership strings and
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# compare them.
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prev_event_content = {}
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if prev_event_id is not None:
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prev_event_content = (
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yield self.store.get_event(prev_event_id)
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).content
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membership = event_content.get("membership", Membership.LEAVE)
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prev_membership = prev_event_content.get("membership", Membership.LEAVE)
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if prev_membership == membership:
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continue
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if prev_membership == Membership.JOIN:
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yield self.store.update_stats_delta(
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now, "room", room_id, "joined_members", -1
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)
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elif prev_membership == Membership.INVITE:
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yield self.store.update_stats_delta(
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now, "room", room_id, "invited_members", -1
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)
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elif prev_membership == Membership.LEAVE:
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yield self.store.update_stats_delta(
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now, "room", room_id, "left_members", -1
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)
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elif prev_membership == Membership.BAN:
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yield self.store.update_stats_delta(
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now, "room", room_id, "banned_members", -1
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)
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else:
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err = "%s is not a valid prev_membership" % (repr(prev_membership),)
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logger.error(err)
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raise ValueError(err)
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if membership == Membership.JOIN:
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yield self.store.update_stats_delta(
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now, "room", room_id, "joined_members", +1
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)
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elif membership == Membership.INVITE:
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yield self.store.update_stats_delta(
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now, "room", room_id, "invited_members", +1
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)
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elif membership == Membership.LEAVE:
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yield self.store.update_stats_delta(
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now, "room", room_id, "left_members", +1
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)
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elif membership == Membership.BAN:
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yield self.store.update_stats_delta(
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now, "room", room_id, "banned_members", +1
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)
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else:
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err = "%s is not a valid membership" % (repr(membership),)
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logger.error(err)
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raise ValueError(err)
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user_id = state_key
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if self.is_mine_id(user_id):
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# update user_stats as it's one of our users
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public = yield self._is_public_room(room_id)
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if membership == Membership.LEAVE:
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yield self.store.update_stats_delta(
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now,
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"user",
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user_id,
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"public_rooms" if public else "private_rooms",
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-1,
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)
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elif membership == Membership.JOIN:
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yield self.store.update_stats_delta(
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now,
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"user",
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user_id,
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"public_rooms" if public else "private_rooms",
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+1,
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)
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elif typ == EventTypes.Create:
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# Newly created room. Add it with all blank portions.
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yield self.store.update_room_state(
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room_id,
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{
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"join_rules": None,
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"history_visibility": None,
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"encryption": None,
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"name": None,
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"topic": None,
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"avatar": None,
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"canonical_alias": None,
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},
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)
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elif typ == EventTypes.JoinRules:
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yield self.store.update_room_state(
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room_id, {"join_rules": event_content.get("join_rule")}
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)
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is_public = yield self._get_key_change(
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prev_event_id, event_id, "join_rule", JoinRules.PUBLIC
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)
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if is_public is not None:
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yield self.update_public_room_stats(now, room_id, is_public)
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elif typ == EventTypes.RoomHistoryVisibility:
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yield self.store.update_room_state(
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room_id,
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{"history_visibility": event_content.get("history_visibility")},
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)
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is_public = yield self._get_key_change(
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prev_event_id, event_id, "history_visibility", "world_readable"
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)
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if is_public is not None:
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yield self.update_public_room_stats(now, room_id, is_public)
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elif typ == EventTypes.Encryption:
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yield self.store.update_room_state(
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room_id, {"encryption": event_content.get("algorithm")}
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)
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elif typ == EventTypes.Name:
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yield self.store.update_room_state(
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room_id, {"name": event_content.get("name")}
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)
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elif typ == EventTypes.Topic:
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yield self.store.update_room_state(
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room_id, {"topic": event_content.get("topic")}
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)
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elif typ == EventTypes.RoomAvatar:
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yield self.store.update_room_state(
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room_id, {"avatar": event_content.get("url")}
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)
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elif typ == EventTypes.CanonicalAlias:
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yield self.store.update_room_state(
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room_id, {"canonical_alias": event_content.get("alias")}
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)
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@defer.inlineCallbacks
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def update_public_room_stats(self, ts, room_id, is_public):
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"""
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Increment/decrement a user's number of public rooms when a room they are
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in changes to/from public visibility.
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Args:
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ts (int): Timestamp in seconds
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room_id (str)
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is_public (bool)
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"""
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# For now, blindly iterate over all local users in the room so that
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# we can handle the whole problem of copying buckets over as needed
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user_ids = yield self.store.get_users_in_room(room_id)
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for user_id in user_ids:
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if self.hs.is_mine(UserID.from_string(user_id)):
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yield self.store.update_stats_delta(
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ts, "user", user_id, "public_rooms", +1 if is_public else -1
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)
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yield self.store.update_stats_delta(
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ts, "user", user_id, "private_rooms", -1 if is_public else +1
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)
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@defer.inlineCallbacks
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def _is_public_room(self, room_id):
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join_rules = yield self.state.get_current_state(room_id, EventTypes.JoinRules)
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history_visibility = yield self.state.get_current_state(
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room_id, EventTypes.RoomHistoryVisibility
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)
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if (join_rules and join_rules.content.get("join_rule") == JoinRules.PUBLIC) or (
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(
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history_visibility
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and history_visibility.content.get("history_visibility")
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== "world_readable"
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)
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):
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defer.returnValue(True)
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else:
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defer.returnValue(False)
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