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# -*- coding: utf-8 -*-
# Copyright 2014, 2015 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from twisted.internet import defer
from synapse.util.logcontext import PreserveLoggingContext
from synapse.util.logutils import log_function
from synapse.types import UserID
from synapse.events.utils import serialize_event
from ._base import BaseHandler
import logging
logger = logging.getLogger(__name__)
class EventStreamHandler(BaseHandler):
def __init__(self, hs):
super(EventStreamHandler, self).__init__(hs)
# Count of active streams per user
self._streams_per_user = {}
# Grace timers per user to delay the "stopped" signal
self._stop_timer_per_user = {}
self.distributor = hs.get_distributor()
self.distributor.declare("started_user_eventstream")
self.distributor.declare("stopped_user_eventstream")
self.clock = hs.get_clock()
self.notifier = hs.get_notifier()
@defer.inlineCallbacks
@log_function
def get_stream(self, auth_user_id, pagin_config, timeout=0,
as_client_event=True, affect_presence=True):
auth_user = UserID.from_string(auth_user_id)
try:
if affect_presence:
if auth_user not in self._streams_per_user:
self._streams_per_user[auth_user] = 0
if auth_user in self._stop_timer_per_user:
try:
self.clock.cancel_call_later(
self._stop_timer_per_user.pop(auth_user)
)
except:
logger.exception("Failed to cancel event timer")
else:
yield self.distributor.fire(
"started_user_eventstream", auth_user
)
self._streams_per_user[auth_user] += 1
rm_handler = self.hs.get_handlers().room_member_handler
room_ids = yield rm_handler.get_rooms_for_user(auth_user)
with PreserveLoggingContext():
events, tokens = yield self.notifier.get_events_for(
auth_user, room_ids, pagin_config, timeout
)
time_now = self.clock.time_msec()
chunks = [
serialize_event(e, time_now, as_client_event) for e in events
]
chunk = {
"chunk": chunks,
"start": tokens[0].to_string(),
"end": tokens[1].to_string(),
}
defer.returnValue(chunk)
finally:
if affect_presence:
self._streams_per_user[auth_user] -= 1
if not self._streams_per_user[auth_user]:
del self._streams_per_user[auth_user]
# 10 seconds of grace to allow the client to reconnect again
# before we think they're gone
def _later():
logger.debug(
"_later stopped_user_eventstream %s", auth_user
)
self._stop_timer_per_user.pop(auth_user, None)
return self.distributor.fire(
"stopped_user_eventstream", auth_user
)
logger.debug("Scheduling _later: for %s", auth_user)
self._stop_timer_per_user[auth_user] = (
self.clock.call_later(30, _later)
)
class EventHandler(BaseHandler):
@defer.inlineCallbacks
def get_event(self, user, event_id):
"""Retrieve a single specified event.
Args:
user (synapse.types.UserID): The user requesting the event
event_id (str): The event ID to obtain.
Returns:
dict: An event, or None if there is no event matching this ID.
Raises:
SynapseError if there was a problem retrieving this event, or
AuthError if the user does not have the rights to inspect this
event.
"""
event = yield self.store.get_event(event_id)
if not event:
defer.returnValue(None)
return
if hasattr(event, "room_id"):
yield self.auth.check_joined_room(event.room_id, user.to_string())
defer.returnValue(event)
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