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https://mau.dev/maunium/synapse.git
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c626fc576a
Access it directly from the homeserver itself. It already wasn't inheriting from BaseHandler storing it on the Handlers object was already somewhat dubious.
536 lines
20 KiB
Python
536 lines
20 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket 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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from twisted.internet import defer
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from synapse.api.constants import EventTypes
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from synapse.api.errors import AuthError
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from synapse.util.logutils import log_function
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from synapse.util.async import ObservableDeferred
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from synapse.util.logcontext import PreserveLoggingContext
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from synapse.types import StreamToken
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from synapse.visibility import filter_events_for_client
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import synapse.metrics
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from collections import namedtuple
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import logging
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logger = logging.getLogger(__name__)
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metrics = synapse.metrics.get_metrics_for(__name__)
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notified_events_counter = metrics.register_counter("notified_events")
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# TODO(paul): Should be shared somewhere
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def count(func, l):
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"""Return the number of items in l for which func returns true."""
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n = 0
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for x in l:
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if func(x):
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n += 1
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return n
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class _NotificationListener(object):
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""" This represents a single client connection to the events stream.
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The events stream handler will have yielded to the deferred, so to
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notify the handler it is sufficient to resolve the deferred.
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"""
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__slots__ = ["deferred"]
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def __init__(self, deferred):
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self.deferred = deferred
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class _NotifierUserStream(object):
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"""This represents a user connected to the event stream.
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It tracks the most recent stream token for that user.
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At a given point a user may have a number of streams listening for
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events.
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This listener will also keep track of which rooms it is listening in
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so that it can remove itself from the indexes in the Notifier class.
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"""
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def __init__(self, user_id, rooms, current_token, time_now_ms,
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appservice=None):
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self.user_id = user_id
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self.appservice = appservice
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self.rooms = set(rooms)
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self.current_token = current_token
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self.last_notified_ms = time_now_ms
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with PreserveLoggingContext():
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self.notify_deferred = ObservableDeferred(defer.Deferred())
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def notify(self, stream_key, stream_id, time_now_ms):
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"""Notify any listeners for this user of a new event from an
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event source.
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Args:
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stream_key(str): The stream the event came from.
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stream_id(str): The new id for the stream the event came from.
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time_now_ms(int): The current time in milliseconds.
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"""
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self.current_token = self.current_token.copy_and_advance(
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stream_key, stream_id
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)
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self.last_notified_ms = time_now_ms
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noify_deferred = self.notify_deferred
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with PreserveLoggingContext():
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self.notify_deferred = ObservableDeferred(defer.Deferred())
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noify_deferred.callback(self.current_token)
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def remove(self, notifier):
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""" Remove this listener from all the indexes in the Notifier
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it knows about.
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"""
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for room in self.rooms:
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lst = notifier.room_to_user_streams.get(room, set())
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lst.discard(self)
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notifier.user_to_user_stream.pop(self.user_id)
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if self.appservice:
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notifier.appservice_to_user_streams.get(
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self.appservice, set()
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).discard(self)
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def count_listeners(self):
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return len(self.notify_deferred.observers())
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def new_listener(self, token):
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"""Returns a deferred that is resolved when there is a new token
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greater than the given token.
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"""
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if self.current_token.is_after(token):
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return _NotificationListener(defer.succeed(self.current_token))
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else:
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return _NotificationListener(self.notify_deferred.observe())
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class EventStreamResult(namedtuple("EventStreamResult", ("events", "tokens"))):
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def __nonzero__(self):
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return bool(self.events)
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class Notifier(object):
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""" This class is responsible for notifying any listeners when there are
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new events available for it.
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Primarily used from the /events stream.
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"""
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UNUSED_STREAM_EXPIRY_MS = 10 * 60 * 1000
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def __init__(self, hs):
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self.user_to_user_stream = {}
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self.room_to_user_streams = {}
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self.appservice_to_user_streams = {}
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self.event_sources = hs.get_event_sources()
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self.store = hs.get_datastore()
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self.pending_new_room_events = []
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self.clock = hs.get_clock()
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self.appservice_handler = hs.get_application_service_handler()
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self.state_handler = hs.get_state_handler()
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hs.get_distributor().observe(
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"user_joined_room", self._user_joined_room
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)
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self.clock.looping_call(
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self.remove_expired_streams, self.UNUSED_STREAM_EXPIRY_MS
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)
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self.replication_deferred = ObservableDeferred(defer.Deferred())
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# This is not a very cheap test to perform, but it's only executed
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# when rendering the metrics page, which is likely once per minute at
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# most when scraping it.
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def count_listeners():
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all_user_streams = set()
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for x in self.room_to_user_streams.values():
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all_user_streams |= x
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for x in self.user_to_user_stream.values():
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all_user_streams.add(x)
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for x in self.appservice_to_user_streams.values():
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all_user_streams |= x
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return sum(stream.count_listeners() for stream in all_user_streams)
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metrics.register_callback("listeners", count_listeners)
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metrics.register_callback(
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"rooms",
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lambda: count(bool, self.room_to_user_streams.values()),
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)
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metrics.register_callback(
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"users",
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lambda: len(self.user_to_user_stream),
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)
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metrics.register_callback(
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"appservices",
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lambda: count(bool, self.appservice_to_user_streams.values()),
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)
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def on_new_room_event(self, event, room_stream_id, max_room_stream_id,
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extra_users=[]):
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""" Used by handlers to inform the notifier something has happened
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in the room, room event wise.
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This triggers the notifier to wake up any listeners that are
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listening to the room, and any listeners for the users in the
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`extra_users` param.
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The events can be peristed out of order. The notifier will wait
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until all previous events have been persisted before notifying
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the client streams.
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"""
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with PreserveLoggingContext():
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self.pending_new_room_events.append((
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room_stream_id, event, extra_users
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))
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self._notify_pending_new_room_events(max_room_stream_id)
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self.notify_replication()
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def _notify_pending_new_room_events(self, max_room_stream_id):
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"""Notify for the room events that were queued waiting for a previous
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event to be persisted.
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Args:
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max_room_stream_id(int): The highest stream_id below which all
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events have been persisted.
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"""
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pending = self.pending_new_room_events
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self.pending_new_room_events = []
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for room_stream_id, event, extra_users in pending:
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if room_stream_id > max_room_stream_id:
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self.pending_new_room_events.append((
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room_stream_id, event, extra_users
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))
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else:
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self._on_new_room_event(event, room_stream_id, extra_users)
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def _on_new_room_event(self, event, room_stream_id, extra_users=[]):
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"""Notify any user streams that are interested in this room event"""
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# poke any interested application service.
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self.appservice_handler.notify_interested_services(event)
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app_streams = set()
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for appservice in self.appservice_to_user_streams:
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# TODO (kegan): Redundant appservice listener checks?
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# App services will already be in the room_to_user_streams set, but
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# that isn't enough. They need to be checked here in order to
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# receive *invites* for users they are interested in. Does this
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# make the room_to_user_streams check somewhat obselete?
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if appservice.is_interested(event):
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app_user_streams = self.appservice_to_user_streams.get(
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appservice, set()
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)
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app_streams |= app_user_streams
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self.on_new_event(
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"room_key", room_stream_id,
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users=extra_users,
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rooms=[event.room_id],
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extra_streams=app_streams,
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)
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def on_new_event(self, stream_key, new_token, users=[], rooms=[],
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extra_streams=set()):
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""" Used to inform listeners that something has happend event wise.
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Will wake up all listeners for the given users and rooms.
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"""
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with PreserveLoggingContext():
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user_streams = set()
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for user in users:
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user_stream = self.user_to_user_stream.get(str(user))
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if user_stream is not None:
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user_streams.add(user_stream)
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for room in rooms:
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user_streams |= self.room_to_user_streams.get(room, set())
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time_now_ms = self.clock.time_msec()
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for user_stream in user_streams:
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try:
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user_stream.notify(stream_key, new_token, time_now_ms)
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except:
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logger.exception("Failed to notify listener")
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self.notify_replication()
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def on_new_replication_data(self):
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"""Used to inform replication listeners that something has happend
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without waking up any of the normal user event streams"""
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with PreserveLoggingContext():
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self.notify_replication()
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@defer.inlineCallbacks
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def wait_for_events(self, user_id, timeout, callback, room_ids=None,
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from_token=StreamToken.START):
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"""Wait until the callback returns a non empty response or the
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timeout fires.
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"""
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user_stream = self.user_to_user_stream.get(user_id)
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if user_stream is None:
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appservice = yield self.store.get_app_service_by_user_id(user_id)
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current_token = yield self.event_sources.get_current_token()
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if room_ids is None:
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rooms = yield self.store.get_rooms_for_user(user_id)
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room_ids = [room.room_id for room in rooms]
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user_stream = _NotifierUserStream(
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user_id=user_id,
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rooms=room_ids,
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appservice=appservice,
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current_token=current_token,
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time_now_ms=self.clock.time_msec(),
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)
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self._register_with_keys(user_stream)
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result = None
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if timeout:
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# Will be set to a _NotificationListener that we'll be waiting on.
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# Allows us to cancel it.
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listener = None
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def timed_out():
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if listener:
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listener.deferred.cancel()
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timer = self.clock.call_later(timeout / 1000., timed_out)
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prev_token = from_token
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while not result:
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try:
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current_token = user_stream.current_token
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result = yield callback(prev_token, current_token)
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if result:
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break
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# Now we wait for the _NotifierUserStream to be told there
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# is a new token.
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# We need to supply the token we supplied to callback so
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# that we don't miss any current_token updates.
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prev_token = current_token
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listener = user_stream.new_listener(prev_token)
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with PreserveLoggingContext():
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yield listener.deferred
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except defer.CancelledError:
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break
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self.clock.cancel_call_later(timer, ignore_errs=True)
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else:
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current_token = user_stream.current_token
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result = yield callback(from_token, current_token)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def get_events_for(self, user, pagination_config, timeout,
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only_keys=None,
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is_guest=False, explicit_room_id=None):
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""" For the given user and rooms, return any new events for them. If
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there are no new events wait for up to `timeout` milliseconds for any
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new events to happen before returning.
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If `only_keys` is not None, events from keys will be sent down.
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If explicit_room_id is not set, the user's joined rooms will be polled
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for events.
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If explicit_room_id is set, that room will be polled for events only if
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it is world readable or the user has joined the room.
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"""
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from_token = pagination_config.from_token
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if not from_token:
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from_token = yield self.event_sources.get_current_token()
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limit = pagination_config.limit
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room_ids, is_joined = yield self._get_room_ids(user, explicit_room_id)
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is_peeking = not is_joined
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@defer.inlineCallbacks
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def check_for_updates(before_token, after_token):
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if not after_token.is_after(before_token):
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defer.returnValue(EventStreamResult([], (from_token, from_token)))
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events = []
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end_token = from_token
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for name, source in self.event_sources.sources.items():
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keyname = "%s_key" % name
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before_id = getattr(before_token, keyname)
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after_id = getattr(after_token, keyname)
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if before_id == after_id:
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continue
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if only_keys and name not in only_keys:
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continue
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new_events, new_key = yield source.get_new_events(
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user=user,
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from_key=getattr(from_token, keyname),
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limit=limit,
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is_guest=is_peeking,
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room_ids=room_ids,
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)
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if name == "room":
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new_events = yield filter_events_for_client(
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self.store,
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user.to_string(),
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new_events,
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is_peeking=is_peeking,
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)
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events.extend(new_events)
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end_token = end_token.copy_and_replace(keyname, new_key)
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defer.returnValue(EventStreamResult(events, (from_token, end_token)))
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user_id_for_stream = user.to_string()
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if is_peeking:
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# Internally, the notifier keeps an event stream per user_id.
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# This is used by both /sync and /events.
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# We want /events to be used for peeking independently of /sync,
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# without polluting its contents. So we invent an illegal user ID
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# (which thus cannot clash with any real users) for keying peeking
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# over /events.
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#
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# I am sorry for what I have done.
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user_id_for_stream = "_PEEKING_%s_%s" % (
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explicit_room_id, user_id_for_stream
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)
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result = yield self.wait_for_events(
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user_id_for_stream,
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timeout,
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check_for_updates,
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room_ids=room_ids,
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from_token=from_token,
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)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def _get_room_ids(self, user, explicit_room_id):
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joined_rooms = yield self.store.get_rooms_for_user(user.to_string())
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joined_room_ids = map(lambda r: r.room_id, joined_rooms)
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if explicit_room_id:
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if explicit_room_id in joined_room_ids:
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defer.returnValue(([explicit_room_id], True))
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if (yield self._is_world_readable(explicit_room_id)):
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defer.returnValue(([explicit_room_id], False))
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raise AuthError(403, "Non-joined access not allowed")
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defer.returnValue((joined_room_ids, True))
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@defer.inlineCallbacks
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def _is_world_readable(self, room_id):
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state = yield self.state_handler.get_current_state(
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room_id,
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EventTypes.RoomHistoryVisibility
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)
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if state and "history_visibility" in state.content:
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defer.returnValue(state.content["history_visibility"] == "world_readable")
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else:
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defer.returnValue(False)
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@log_function
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def remove_expired_streams(self):
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time_now_ms = self.clock.time_msec()
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expired_streams = []
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expire_before_ts = time_now_ms - self.UNUSED_STREAM_EXPIRY_MS
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for stream in self.user_to_user_stream.values():
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if stream.count_listeners():
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continue
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if stream.last_notified_ms < expire_before_ts:
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expired_streams.append(stream)
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for expired_stream in expired_streams:
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expired_stream.remove(self)
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@log_function
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def _register_with_keys(self, user_stream):
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self.user_to_user_stream[user_stream.user_id] = user_stream
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for room in user_stream.rooms:
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s = self.room_to_user_streams.setdefault(room, set())
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s.add(user_stream)
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if user_stream.appservice:
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self.appservice_to_user_stream.setdefault(
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user_stream.appservice, set()
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).add(user_stream)
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def _user_joined_room(self, user, room_id):
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user = str(user)
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new_user_stream = self.user_to_user_stream.get(user)
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if new_user_stream is not None:
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room_streams = self.room_to_user_streams.setdefault(room_id, set())
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room_streams.add(new_user_stream)
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new_user_stream.rooms.add(room_id)
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def notify_replication(self):
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"""Notify the any replication listeners that there's a new event"""
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with PreserveLoggingContext():
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deferred = self.replication_deferred
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self.replication_deferred = ObservableDeferred(defer.Deferred())
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deferred.callback(None)
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@defer.inlineCallbacks
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def wait_for_replication(self, callback, timeout):
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"""Wait for an event to happen.
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Args:
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callback: Gets called whenever an event happens. If this returns a
|
|
truthy value then ``wait_for_replication`` returns, otherwise
|
|
it waits for another event.
|
|
timeout: How many milliseconds to wait for callback return a truthy
|
|
value.
|
|
|
|
Returns:
|
|
A deferred that resolves with the value returned by the callback.
|
|
"""
|
|
listener = _NotificationListener(None)
|
|
|
|
def timed_out():
|
|
listener.deferred.cancel()
|
|
|
|
timer = self.clock.call_later(timeout / 1000., timed_out)
|
|
while True:
|
|
listener.deferred = self.replication_deferred.observe()
|
|
result = yield callback()
|
|
if result:
|
|
break
|
|
|
|
try:
|
|
with PreserveLoggingContext():
|
|
yield listener.deferred
|
|
except defer.CancelledError:
|
|
break
|
|
|
|
self.clock.cancel_call_later(timer, ignore_errs=True)
|
|
|
|
defer.returnValue(result)
|