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# -*- coding: utf-8 -*-
# Copyright 2014 matrix.org
#
# 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, reactor
from synapse.util.logutils import log_function
import logging
logger = logging.getLogger(__name__)
class _NotificationListener(object):
def __init__(self, user, rooms, from_token, limit, timeout, deferred):
self.user = user
self.from_token = from_token
self.limit = limit
self.timeout = timeout
self.deferred = deferred
self.rooms = rooms
self.pending_notifications = []
def notify(self, notifier, events, start_token, end_token):
result = (events, (start_token, end_token))
try:
self.deferred.callback(result)
except defer.AlreadyCalledError:
pass
for room in self.rooms:
lst = notifier.rooms_to_listeners.get(room, set())
lst.discard(self)
notifier.user_to_listeners.get(self.user, set()).discard(self)
class Notifier(object):
def __init__(self, hs):
self.hs = hs
self.rooms_to_listeners = {}
self.user_to_listeners = {}
self.event_sources = hs.get_event_sources()
hs.get_distributor().observe(
"user_joined_room", self._user_joined_room
)
@log_function
@defer.inlineCallbacks
def on_new_room_event(self, event, extra_users=[]):
room_id = event.room_id
source = self.event_sources.sources[0]
listeners = self.rooms_to_listeners.get(room_id, set()).copy()
for user in extra_users:
listeners |= self.user_to_listeners.get(user, set()).copy()
logger.debug("on_new_room_event listeners %s", listeners)
# TODO (erikj): Can we make this more efficient by hitting the
# db once?
for listener in listeners:
events, end_token = yield source.get_new_events_for_user(
listener.user,
listener.from_token,
listener.limit,
)
if events:
listener.notify(
self, events, listener.from_token, end_token
)
@defer.inlineCallbacks
def on_new_user_event(self, users=[], rooms=[]):
source = self.event_sources.sources[1]
listeners = set()
for user in users:
listeners |= self.user_to_listeners.get(user, set()).copy()
for room in rooms:
listeners |= self.rooms_to_listeners.get(room, set()).copy()
for listener in listeners:
events, end_token = yield source.get_new_events_for_user(
listener.user,
listener.from_token,
listener.limit,
)
if events:
listener.notify(
self, events, listener.from_token, end_token
)
def get_events_for(self, user, rooms, pagination_config, timeout):
deferred = defer.Deferred()
self._get_events(
deferred, user, rooms, pagination_config.from_token,
pagination_config.limit, timeout
).addErrback(deferred.errback)
return deferred
@defer.inlineCallbacks
def _get_events(self, deferred, user, rooms, from_token, limit, timeout):
if not from_token:
from_token = yield self.event_sources.get_current_token()
listener = _NotificationListener(
user,
rooms,
from_token,
limit,
timeout,
deferred,
)
if timeout:
reactor.callLater(timeout/1000, self._timeout_listener, listener)
self._register_with_keys(listener)
yield self._check_for_updates(listener)
return
def _timeout_listener(self, listener):
# TODO (erikj): We should probably set to_token to the current max
# rather than reusing from_token.
listener.notify(
self,
[],
listener.from_token,
listener.from_token,
)
@log_function
def _register_with_keys(self, listener):
for room in listener.rooms:
s = self.rooms_to_listeners.setdefault(room, set())
s.add(listener)
self.user_to_listeners.setdefault(listener.user, set()).add(listener)
@defer.inlineCallbacks
@log_function
def _check_for_updates(self, listener):
# TODO (erikj): We need to think about limits across multiple sources
events = []
from_token = listener.from_token
limit = listener.limit
# TODO (erikj): DeferredList?
for source in self.event_sources.sources:
stuff, new_token = yield source.get_new_events_for_user(
listener.user,
from_token,
limit,
)
events.extend(stuff)
from_token = new_token
end_token = from_token
if events:
listener.notify(self, events, listener.from_token, end_token)
defer.returnValue(listener)
def _user_joined_room(self, user, room_id):
new_listeners = self.user_to_listeners.get(user, set())
listeners = self.rooms_to_listeners.setdefault(room_id, set())
listeners |= new_listeners
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