220 lines
7.6 KiB
Python
220 lines
7.6 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 synapse.util.logcontext import preserve_context_over_fn
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from synapse.api.constants import Membership, EventTypes
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from synapse.events import EventBase
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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 preserve_context_over_fn(
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distributor.fire,
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"started_user_eventstream", user
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)
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def stopped_user_eventstream(distributor, user):
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return preserve_context_over_fn(
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distributor.fire,
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"stopped_user_eventstream", user
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)
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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_keys=None, room_id=None, is_guest=False):
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"""Fetches the events stream for a given user.
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If `only_keys` is not None, events from keys will be sent down.
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"""
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auth_user = UserID.from_string(auth_user_id)
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presence_handler = self.hs.get_handlers().presence_handler
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context = yield presence_handler.user_syncing(
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auth_user_id, affect_presence=affect_presence,
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)
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with context:
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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_keys=only_keys,
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is_guest=is_guest, explicit_room_id=room_id
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)
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# When the user joins a new room, or another user joins a currently
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# joined room, we need to send down presence for those users.
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to_add = []
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for event in events:
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if not isinstance(event, EventBase):
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continue
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if event.type == EventTypes.Member:
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if event.membership != Membership.JOIN:
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continue
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# Send down presence.
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if event.state_key == auth_user_id:
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# Send down presence for everyone in the room.
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users = yield self.store.get_users_in_room(event.room_id)
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states = yield presence_handler.get_states(
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users,
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as_event=True,
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)
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to_add.extend(states)
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else:
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ev = yield presence_handler.get_state(
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UserID.from_string(event.state_key),
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as_event=True,
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)
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to_add.append(ev)
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events.extend(to_add)
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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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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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