180 lines
6.3 KiB
Python
180 lines
6.3 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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import logging
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import random
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from twisted.internet import defer
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import AuthError, SynapseError
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from synapse.events import EventBase
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from synapse.types import UserID
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from synapse.util.logutils import log_function
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from synapse.visibility import filter_events_for_client
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from ._base import BaseHandler
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logger = logging.getLogger(__name__)
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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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self.state = hs.get_state_handler()
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self._server_notices_sender = hs.get_server_notices_sender()
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self._event_serializer = hs.get_event_client_serializer()
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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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if room_id:
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blocked = yield self.store.is_room_blocked(room_id)
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if blocked:
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raise SynapseError(403, "This room has been blocked on this server")
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# send any outstanding server notices to the user.
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yield self._server_notices_sender.on_user_syncing(auth_user_id)
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auth_user = UserID.from_string(auth_user_id)
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presence_handler = self.hs.get_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.state.get_current_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 = yield self._event_serializer.serialize_events(
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events, time_now, as_client_event=as_client_event,
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# We don't bundle "live" events, as otherwise clients
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# will end up double counting annotations.
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bundle_aggregations=False,
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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, room_id, 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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room_id (str|None): The expected room id. We'll return None if the
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event's room does not match.
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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, check_room_id=room_id)
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if not event:
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defer.returnValue(None)
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return
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users = yield self.store.get_users_in_room(event.room_id)
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is_peeking = user.to_string() not in users
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filtered = yield filter_events_for_client(
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self.store,
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user.to_string(),
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[event],
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is_peeking=is_peeking
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)
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if not filtered:
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raise AuthError(
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403,
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"You don't have permission to access that event."
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)
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defer.returnValue(event)
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