152 lines
5.1 KiB
Python
152 lines
5.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 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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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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@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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auth_user = UserID.from_string(auth_user_id)
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try:
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if affect_presence:
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if auth_user not in self._streams_per_user:
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self._streams_per_user[auth_user] = 0
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if auth_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(auth_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 self.distributor.fire(
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"started_user_eventstream", auth_user
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)
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self._streams_per_user[auth_user] += 1
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rm_handler = self.hs.get_handlers().room_member_handler
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room_ids = yield rm_handler.get_joined_rooms_for_user(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, room_ids, pagin_config, timeout
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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._streams_per_user[auth_user] -= 1
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if not self._streams_per_user[auth_user]:
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del self._streams_per_user[auth_user]
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# 10 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(
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"_later stopped_user_eventstream %s", auth_user
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)
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self._stop_timer_per_user.pop(auth_user, None)
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return self.distributor.fire(
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"stopped_user_eventstream", auth_user
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)
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logger.debug("Scheduling _later: for %s", auth_user)
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self._stop_timer_per_user[auth_user] = (
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self.clock.call_later(30, _later)
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)
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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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