mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-10-01 11:49:51 -04:00
433 lines
15 KiB
Python
433 lines
15 KiB
Python
# -*- 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.logutils import log_function
|
|
from synapse.util.async import run_on_reactor
|
|
from synapse.types import StreamToken
|
|
import synapse.metrics
|
|
|
|
import logging
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
metrics = synapse.metrics.get_metrics_for(__name__)
|
|
|
|
notified_events_counter = metrics.register_counter("notified_events")
|
|
|
|
|
|
# TODO(paul): Should be shared somewhere
|
|
def count(func, l):
|
|
"""Return the number of items in l for which func returns true."""
|
|
n = 0
|
|
for x in l:
|
|
if func(x):
|
|
n += 1
|
|
return n
|
|
|
|
|
|
class _NotificationListener(object):
|
|
""" This represents a single client connection to the events stream.
|
|
The events stream handler will have yielded to the deferred, so to
|
|
notify the handler it is sufficient to resolve the deferred.
|
|
"""
|
|
|
|
def __init__(self, deferred):
|
|
self.deferred = deferred
|
|
|
|
def notified(self):
|
|
return self.deferred.called
|
|
|
|
def notify(self, token):
|
|
""" Inform whoever is listening about the new events.
|
|
"""
|
|
try:
|
|
self.deferred.callback(token)
|
|
except defer.AlreadyCalledError:
|
|
pass
|
|
|
|
|
|
class _NotifierUserStream(object):
|
|
"""This represents a user connected to the event stream.
|
|
It tracks the most recent stream token for that user.
|
|
At a given point a user may have a number of streams listening for
|
|
events.
|
|
|
|
This listener will also keep track of which rooms it is listening in
|
|
so that it can remove itself from the indexes in the Notifier class.
|
|
"""
|
|
|
|
def __init__(self, user, rooms, current_token, time_now_ms,
|
|
appservice=None):
|
|
self.user = str(user)
|
|
self.appservice = appservice
|
|
self.listeners = set()
|
|
self.rooms = set(rooms)
|
|
self.current_token = current_token
|
|
self.last_notified_ms = time_now_ms
|
|
|
|
def notify(self, stream_key, stream_id, time_now_ms):
|
|
"""Notify any listeners for this user of a new event from an
|
|
event source.
|
|
Args:
|
|
stream_key(str): The stream the event came from.
|
|
stream_id(str): The new id for the stream the event came from.
|
|
time_now_ms(int): The current time in milliseconds.
|
|
"""
|
|
self.current_token = self.current_token.copy_and_advance(
|
|
stream_key, stream_id
|
|
)
|
|
if self.listeners:
|
|
self.last_notified_ms = time_now_ms
|
|
listeners = self.listeners
|
|
self.listeners = set()
|
|
for listener in listeners:
|
|
listener.notify(self.current_token)
|
|
|
|
def remove(self, notifier):
|
|
""" Remove this listener from all the indexes in the Notifier
|
|
it knows about.
|
|
"""
|
|
|
|
for room in self.rooms:
|
|
lst = notifier.room_to_user_streams.get(room, set())
|
|
lst.discard(self)
|
|
|
|
notifier.user_to_user_stream.pop(self.user)
|
|
|
|
if self.appservice:
|
|
notifier.appservice_to_user_streams.get(
|
|
self.appservice, set()
|
|
).discard(self)
|
|
|
|
|
|
class Notifier(object):
|
|
""" This class is responsible for notifying any listeners when there are
|
|
new events available for it.
|
|
|
|
Primarily used from the /events stream.
|
|
"""
|
|
|
|
UNUSED_STREAM_EXPIRY_MS = 10 * 60 * 1000
|
|
|
|
def __init__(self, hs):
|
|
self.hs = hs
|
|
|
|
self.user_to_user_stream = {}
|
|
self.room_to_user_streams = {}
|
|
self.appservice_to_user_streams = {}
|
|
|
|
self.event_sources = hs.get_event_sources()
|
|
self.store = hs.get_datastore()
|
|
self.pending_new_room_events = []
|
|
|
|
self.clock = hs.get_clock()
|
|
|
|
hs.get_distributor().observe(
|
|
"user_joined_room", self._user_joined_room
|
|
)
|
|
|
|
self.clock.looping_call(
|
|
self.remove_expired_streams, self.UNUSED_STREAM_EXPIRY_MS
|
|
)
|
|
|
|
# This is not a very cheap test to perform, but it's only executed
|
|
# when rendering the metrics page, which is likely once per minute at
|
|
# most when scraping it.
|
|
def count_listeners():
|
|
all_user_streams = set()
|
|
|
|
for x in self.room_to_user_streams.values():
|
|
all_user_streams |= x
|
|
for x in self.user_to_user_stream:
|
|
all_user_streams.add(x)
|
|
for x in self.appservice_to_user_streams.values():
|
|
all_user_streams |= x
|
|
|
|
return sum(len(stream.listeners) for stream in all_user_streams)
|
|
metrics.register_callback("listeners", count_listeners)
|
|
|
|
metrics.register_callback(
|
|
"rooms",
|
|
lambda: count(bool, self.room_to_user_streams.values()),
|
|
)
|
|
metrics.register_callback(
|
|
"users",
|
|
lambda: len(self.user_to_user_stream),
|
|
)
|
|
metrics.register_callback(
|
|
"appservices",
|
|
lambda: count(bool, self.appservice_to_user_streams.values()),
|
|
)
|
|
|
|
@log_function
|
|
@defer.inlineCallbacks
|
|
def on_new_room_event(self, event, room_stream_id, max_room_stream_id,
|
|
extra_users=[]):
|
|
""" Used by handlers to inform the notifier something has happened
|
|
in the room, room event wise.
|
|
|
|
This triggers the notifier to wake up any listeners that are
|
|
listening to the room, and any listeners for the users in the
|
|
`extra_users` param.
|
|
|
|
The events can be peristed out of order. The notifier will wait
|
|
until all previous events have been persisted before notifying
|
|
the client streams.
|
|
"""
|
|
yield run_on_reactor()
|
|
|
|
self.pending_new_room_events.append((
|
|
room_stream_id, event, extra_users
|
|
))
|
|
self._notify_pending_new_room_events(max_room_stream_id)
|
|
|
|
def _notify_pending_new_room_events(self, max_room_stream_id):
|
|
"""Notify for the room events that were queued waiting for a previous
|
|
event to be persisted.
|
|
Args:
|
|
max_room_stream_id(int): The highest stream_id below which all
|
|
events have been persisted.
|
|
"""
|
|
pending = self.pending_new_room_events
|
|
self.pending_new_room_events = []
|
|
for room_stream_id, event, extra_users in pending:
|
|
if room_stream_id > max_room_stream_id:
|
|
self.pending_new_room_events.append((
|
|
room_stream_id, event, extra_users
|
|
))
|
|
else:
|
|
self._on_new_room_event(event, room_stream_id, extra_users)
|
|
|
|
def _on_new_room_event(self, event, room_stream_id, extra_users=[]):
|
|
"""Notify any user streams that are interested in this room event"""
|
|
# poke any interested application service.
|
|
self.hs.get_handlers().appservice_handler.notify_interested_services(
|
|
event
|
|
)
|
|
|
|
room_id = event.room_id
|
|
|
|
room_user_streams = self.room_to_user_streams.get(room_id, set())
|
|
|
|
user_streams = room_user_streams.copy()
|
|
|
|
for user in extra_users:
|
|
user_stream = self.user_to_user_stream.get(str(user))
|
|
if user_stream is not None:
|
|
user_streams.add(user_stream)
|
|
|
|
for appservice in self.appservice_to_user_streams:
|
|
# TODO (kegan): Redundant appservice listener checks?
|
|
# App services will already be in the room_to_user_streams set, but
|
|
# that isn't enough. They need to be checked here in order to
|
|
# receive *invites* for users they are interested in. Does this
|
|
# make the room_to_user_streams check somewhat obselete?
|
|
if appservice.is_interested(event):
|
|
app_user_streams = self.appservice_to_user_streams.get(
|
|
appservice, set()
|
|
)
|
|
user_streams |= app_user_streams
|
|
|
|
logger.debug("on_new_room_event listeners %s", user_streams)
|
|
|
|
time_now_ms = self.clock.time_msec()
|
|
for user_stream in user_streams:
|
|
try:
|
|
user_stream.notify(
|
|
"room_key", "s%d" % (room_stream_id,), time_now_ms
|
|
)
|
|
except:
|
|
logger.exception("Failed to notify listener")
|
|
|
|
@defer.inlineCallbacks
|
|
@log_function
|
|
def on_new_user_event(self, stream_key, new_token, users=[], rooms=[]):
|
|
""" Used to inform listeners that something has happend
|
|
presence/user event wise.
|
|
|
|
Will wake up all listeners for the given users and rooms.
|
|
"""
|
|
yield run_on_reactor()
|
|
user_streams = set()
|
|
|
|
for user in users:
|
|
user_stream = self.user_to_user_stream.get(str(user))
|
|
if user_stream is not None:
|
|
user_streams.add(user_stream)
|
|
|
|
for room in rooms:
|
|
user_streams |= self.room_to_user_streams.get(room, set())
|
|
|
|
time_now_ms = self.clock.time_msec()
|
|
for user_stream in user_streams:
|
|
try:
|
|
user_stream.notify(stream_key, new_token, time_now_ms)
|
|
except:
|
|
logger.exception("Failed to notify listener")
|
|
|
|
@defer.inlineCallbacks
|
|
def wait_for_events(self, user, rooms, timeout, callback,
|
|
from_token=StreamToken("s0", "0", "0")):
|
|
"""Wait until the callback returns a non empty response or the
|
|
timeout fires.
|
|
"""
|
|
|
|
deferred = defer.Deferred()
|
|
time_now_ms = self.clock.time_msec()
|
|
|
|
user = str(user)
|
|
user_stream = self.user_to_user_stream.get(user)
|
|
if user_stream is None:
|
|
appservice = yield self.store.get_app_service_by_user_id(user)
|
|
current_token = yield self.event_sources.get_current_token()
|
|
rooms = yield self.store.get_rooms_for_user(user)
|
|
rooms = [room.room_id for room in rooms]
|
|
user_stream = _NotifierUserStream(
|
|
user=user,
|
|
rooms=rooms,
|
|
appservice=appservice,
|
|
current_token=current_token,
|
|
time_now_ms=time_now_ms,
|
|
)
|
|
self._register_with_keys(user_stream)
|
|
else:
|
|
current_token = user_stream.current_token
|
|
|
|
listener = [_NotificationListener(deferred)]
|
|
|
|
if timeout and not current_token.is_after(from_token):
|
|
user_stream.listeners.add(listener[0])
|
|
|
|
if current_token.is_after(from_token):
|
|
result = yield callback(from_token, current_token)
|
|
else:
|
|
result = None
|
|
|
|
timer = [None]
|
|
|
|
if result:
|
|
user_stream.listeners.discard(listener[0])
|
|
defer.returnValue(result)
|
|
return
|
|
|
|
if timeout:
|
|
timed_out = [False]
|
|
|
|
def _timeout_listener():
|
|
timed_out[0] = True
|
|
timer[0] = None
|
|
user_stream.listeners.discard(listener[0])
|
|
listener[0].notify(current_token)
|
|
|
|
# We create multiple notification listeners so we have to manage
|
|
# canceling the timeout ourselves.
|
|
timer[0] = self.clock.call_later(timeout/1000., _timeout_listener)
|
|
|
|
while not result and not timed_out[0]:
|
|
new_token = yield deferred
|
|
deferred = defer.Deferred()
|
|
listener[0] = _NotificationListener(deferred)
|
|
user_stream.listeners.add(listener[0])
|
|
result = yield callback(current_token, new_token)
|
|
current_token = new_token
|
|
|
|
if timer[0] is not None:
|
|
try:
|
|
self.clock.cancel_call_later(timer[0])
|
|
except:
|
|
logger.exception("Failed to cancel notifer timer")
|
|
|
|
defer.returnValue(result)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_events_for(self, user, rooms, pagination_config, timeout):
|
|
""" For the given user and rooms, return any new events for them. If
|
|
there are no new events wait for up to `timeout` milliseconds for any
|
|
new events to happen before returning.
|
|
"""
|
|
from_token = pagination_config.from_token
|
|
if not from_token:
|
|
from_token = yield self.event_sources.get_current_token()
|
|
|
|
limit = pagination_config.limit
|
|
|
|
@defer.inlineCallbacks
|
|
def check_for_updates(before_token, after_token):
|
|
events = []
|
|
end_token = from_token
|
|
for name, source in self.event_sources.sources.items():
|
|
keyname = "%s_key" % name
|
|
before_id = getattr(before_token, keyname)
|
|
after_id = getattr(after_token, keyname)
|
|
if before_id == after_id:
|
|
continue
|
|
stuff, new_key = yield source.get_new_events_for_user(
|
|
user, getattr(from_token, keyname), limit,
|
|
)
|
|
events.extend(stuff)
|
|
end_token = end_token.copy_and_replace(keyname, new_key)
|
|
|
|
if events:
|
|
defer.returnValue((events, (from_token, end_token)))
|
|
else:
|
|
defer.returnValue(None)
|
|
|
|
result = yield self.wait_for_events(
|
|
user, rooms, timeout, check_for_updates, from_token=from_token
|
|
)
|
|
|
|
if result is None:
|
|
result = ([], (from_token, from_token))
|
|
|
|
defer.returnValue(result)
|
|
|
|
@log_function
|
|
def remove_expired_streams(self):
|
|
time_now_ms = self.clock.time_msec()
|
|
expired_streams = []
|
|
expire_before_ts = time_now_ms - self.UNUSED_STREAM_EXPIRY_MS
|
|
for stream in self.user_to_user_stream.values():
|
|
if stream.listeners:
|
|
continue
|
|
if stream.last_notified_ms < expire_before_ts:
|
|
expired_streams.append(stream)
|
|
|
|
for expired_stream in expired_streams:
|
|
expired_stream.remove(self)
|
|
|
|
@log_function
|
|
def _register_with_keys(self, user_stream):
|
|
self.user_to_user_stream[user_stream.user] = user_stream
|
|
|
|
for room in user_stream.rooms:
|
|
s = self.room_to_user_streams.setdefault(room, set())
|
|
s.add(user_stream)
|
|
|
|
if user_stream.appservice:
|
|
self.appservice_to_user_stream.setdefault(
|
|
user_stream.appservice, set()
|
|
).add(user_stream)
|
|
|
|
def _user_joined_room(self, user, room_id):
|
|
user = str(user)
|
|
new_user_stream = self.user_to_user_stream.get(user)
|
|
if new_user_stream is not None:
|
|
room_streams = self.room_to_user_streams.setdefault(room_id, set())
|
|
room_streams.add(new_user_stream)
|
|
new_user_stream.rooms.add(room_id)
|