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![Erik Johnston](/assets/img/avatar_default.png)
Firing the 'user_joined_room' signal everytime a guest hits /events causes all presence for that room to be returned in the stream. This may sound helpful, but causes clients to tightloop calling /events. In general, guest users should get the initial presence from (room) intial sync and so we don't require presence to sbsequently come down the event stream.
186 lines
6.1 KiB
Python
186 lines
6.1 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.util.logutils import log_function
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from synapse.types import UserID
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from synapse.events.utils import serialize_event
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from ._base import BaseHandler
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import logging
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import random
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logger = logging.getLogger(__name__)
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def started_user_eventstream(distributor, user):
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return distributor.fire("started_user_eventstream", user)
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def stopped_user_eventstream(distributor, user):
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return distributor.fire("stopped_user_eventstream", user)
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class EventStreamHandler(BaseHandler):
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def __init__(self, hs):
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super(EventStreamHandler, self).__init__(hs)
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# Count of active streams per user
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self._streams_per_user = {}
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# Grace timers per user to delay the "stopped" signal
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self._stop_timer_per_user = {}
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self.distributor = hs.get_distributor()
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self.distributor.declare("started_user_eventstream")
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self.distributor.declare("stopped_user_eventstream")
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self.clock = hs.get_clock()
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self.notifier = hs.get_notifier()
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@defer.inlineCallbacks
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def started_stream(self, user):
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"""Tells the presence handler that we have started an eventstream for
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the user:
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Args:
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user (User): The user who started a stream.
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Returns:
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A deferred that completes once their presence has been updated.
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"""
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if user not in self._streams_per_user:
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# Make sure we set the streams per user to 1 here rather than
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# setting it to zero and incrementing the value below.
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# Otherwise this may race with stopped_stream causing the
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# user to be erased from the map before we have a chance
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# to increment it.
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self._streams_per_user[user] = 1
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if user in self._stop_timer_per_user:
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try:
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self.clock.cancel_call_later(
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self._stop_timer_per_user.pop(user)
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)
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except:
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logger.exception("Failed to cancel event timer")
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else:
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yield started_user_eventstream(self.distributor, user)
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else:
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self._streams_per_user[user] += 1
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def stopped_stream(self, user):
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"""If there are no streams for a user this starts a timer that will
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notify the presence handler that we haven't got an event stream for
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the user unless the user starts a new stream in 30 seconds.
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Args:
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user (User): The user who stopped a stream.
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"""
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self._streams_per_user[user] -= 1
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if not self._streams_per_user[user]:
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del self._streams_per_user[user]
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# 30 seconds of grace to allow the client to reconnect again
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# before we think they're gone
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def _later():
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logger.debug("_later stopped_user_eventstream %s", user)
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self._stop_timer_per_user.pop(user, None)
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return stopped_user_eventstream(self.distributor, user)
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logger.debug("Scheduling _later: for %s", user)
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self._stop_timer_per_user[user] = (
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self.clock.call_later(30, _later)
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)
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@defer.inlineCallbacks
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@log_function
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def get_stream(self, auth_user_id, pagin_config, timeout=0,
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as_client_event=True, affect_presence=True,
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only_room_events=False, room_id=None, is_guest=False):
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"""Fetches the events stream for a given user.
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If `only_room_events` is `True` only room events will be returned.
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"""
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auth_user = UserID.from_string(auth_user_id)
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try:
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if affect_presence:
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yield self.started_stream(auth_user)
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if timeout:
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# If they've set a timeout set a minimum limit.
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timeout = max(timeout, 500)
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# Add some randomness to this value to try and mitigate against
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# thundering herds on restart.
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timeout = random.randint(int(timeout*0.9), int(timeout*1.1))
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events, tokens = yield self.notifier.get_events_for(
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auth_user, pagin_config, timeout,
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only_room_events=only_room_events,
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is_guest=is_guest, guest_room_id=room_id
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)
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time_now = self.clock.time_msec()
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chunks = [
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serialize_event(e, time_now, as_client_event) for e in events
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]
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chunk = {
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"chunk": chunks,
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"start": tokens[0].to_string(),
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"end": tokens[1].to_string(),
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}
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defer.returnValue(chunk)
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finally:
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if affect_presence:
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self.stopped_stream(auth_user)
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class EventHandler(BaseHandler):
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@defer.inlineCallbacks
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def get_event(self, user, event_id):
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"""Retrieve a single specified event.
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Args:
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user (synapse.types.UserID): The user requesting the event
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event_id (str): The event ID to obtain.
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Returns:
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dict: An event, or None if there is no event matching this ID.
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Raises:
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SynapseError if there was a problem retrieving this event, or
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AuthError if the user does not have the rights to inspect this
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event.
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"""
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event = yield self.store.get_event(event_id)
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if not event:
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defer.returnValue(None)
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return
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if hasattr(event, "room_id"):
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yield self.auth.check_joined_room(event.room_id, user.to_string())
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defer.returnValue(event)
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