451 lines
16 KiB
Python
451 lines
16 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 collections import namedtuple
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from typing import TYPE_CHECKING, List, Set, Tuple
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from synapse.api.errors import AuthError, ShadowBanError, SynapseError
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.replication.tcp.streams import TypingStream
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from synapse.types import UserID, get_domain_from_id
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from synapse.util.caches.stream_change_cache import StreamChangeCache
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from synapse.util.metrics import Measure
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from synapse.util.wheel_timer import WheelTimer
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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# A tiny object useful for storing a user's membership in a room, as a mapping
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# key
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RoomMember = namedtuple("RoomMember", ("room_id", "user_id"))
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# How often we expect remote servers to resend us presence.
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FEDERATION_TIMEOUT = 60 * 1000
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# How often to resend typing across federation.
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FEDERATION_PING_INTERVAL = 40 * 1000
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class FollowerTypingHandler:
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"""A typing handler on a different process than the writer that is updated
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via replication.
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"""
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastore()
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self.server_name = hs.config.server_name
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self.clock = hs.get_clock()
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self.is_mine_id = hs.is_mine_id
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self.federation = None
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if hs.should_send_federation():
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self.federation = hs.get_federation_sender()
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if hs.config.worker.writers.typing != hs.get_instance_name():
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hs.get_federation_registry().register_instance_for_edu(
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"m.typing", hs.config.worker.writers.typing,
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)
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# map room IDs to serial numbers
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self._room_serials = {}
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# map room IDs to sets of users currently typing
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self._room_typing = {}
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self._member_last_federation_poke = {}
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self.wheel_timer = WheelTimer(bucket_size=5000)
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self._latest_room_serial = 0
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self.clock.looping_call(self._handle_timeouts, 5000)
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def _reset(self):
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"""Reset the typing handler's data caches.
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"""
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# map room IDs to serial numbers
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self._room_serials = {}
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# map room IDs to sets of users currently typing
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self._room_typing = {}
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self._member_last_federation_poke = {}
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self.wheel_timer = WheelTimer(bucket_size=5000)
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def _handle_timeouts(self):
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logger.debug("Checking for typing timeouts")
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now = self.clock.time_msec()
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members = set(self.wheel_timer.fetch(now))
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for member in members:
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self._handle_timeout_for_member(now, member)
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def _handle_timeout_for_member(self, now: int, member: RoomMember):
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if not self.is_typing(member):
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# Nothing to do if they're no longer typing
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return
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# Check if we need to resend a keep alive over federation for this
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# user.
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if self.federation and self.is_mine_id(member.user_id):
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last_fed_poke = self._member_last_federation_poke.get(member, None)
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if not last_fed_poke or last_fed_poke + FEDERATION_PING_INTERVAL <= now:
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run_as_background_process(
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"typing._push_remote", self._push_remote, member=member, typing=True
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)
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# Add a paranoia timer to ensure that we always have a timer for
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# each person typing.
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self.wheel_timer.insert(now=now, obj=member, then=now + 60 * 1000)
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def is_typing(self, member):
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return member.user_id in self._room_typing.get(member.room_id, [])
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async def _push_remote(self, member, typing):
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if not self.federation:
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return
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try:
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users = await self.store.get_users_in_room(member.room_id)
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self._member_last_federation_poke[member] = self.clock.time_msec()
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now = self.clock.time_msec()
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self.wheel_timer.insert(
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now=now, obj=member, then=now + FEDERATION_PING_INTERVAL
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)
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for domain in {get_domain_from_id(u) for u in users}:
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if domain != self.server_name:
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logger.debug("sending typing update to %s", domain)
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self.federation.build_and_send_edu(
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destination=domain,
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edu_type="m.typing",
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content={
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"room_id": member.room_id,
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"user_id": member.user_id,
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"typing": typing,
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},
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key=member,
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)
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except Exception:
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logger.exception("Error pushing typing notif to remotes")
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def process_replication_rows(
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self, token: int, rows: List[TypingStream.TypingStreamRow]
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):
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"""Should be called whenever we receive updates for typing stream.
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"""
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if self._latest_room_serial > token:
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# The master has gone backwards. To prevent inconsistent data, just
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# clear everything.
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self._reset()
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# Set the latest serial token to whatever the server gave us.
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self._latest_room_serial = token
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for row in rows:
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self._room_serials[row.room_id] = token
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prev_typing = set(self._room_typing.get(row.room_id, []))
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now_typing = set(row.user_ids)
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self._room_typing[row.room_id] = row.user_ids
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run_as_background_process(
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"_handle_change_in_typing",
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self._handle_change_in_typing,
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row.room_id,
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prev_typing,
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now_typing,
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)
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async def _handle_change_in_typing(
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self, room_id: str, prev_typing: Set[str], now_typing: Set[str]
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):
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"""Process a change in typing of a room from replication, sending EDUs
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for any local users.
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"""
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for user_id in now_typing - prev_typing:
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if self.is_mine_id(user_id):
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await self._push_remote(RoomMember(room_id, user_id), True)
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for user_id in prev_typing - now_typing:
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if self.is_mine_id(user_id):
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await self._push_remote(RoomMember(room_id, user_id), False)
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def get_current_token(self):
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return self._latest_room_serial
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class TypingWriterHandler(FollowerTypingHandler):
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def __init__(self, hs):
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super().__init__(hs)
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assert hs.config.worker.writers.typing == hs.get_instance_name()
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self.auth = hs.get_auth()
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self.notifier = hs.get_notifier()
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self.hs = hs
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hs.get_federation_registry().register_edu_handler("m.typing", self._recv_edu)
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hs.get_distributor().observe("user_left_room", self.user_left_room)
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self._member_typing_until = {} # clock time we expect to stop
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# caches which room_ids changed at which serials
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self._typing_stream_change_cache = StreamChangeCache(
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"TypingStreamChangeCache", self._latest_room_serial
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)
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def _handle_timeout_for_member(self, now: int, member: RoomMember):
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super()._handle_timeout_for_member(now, member)
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if not self.is_typing(member):
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# Nothing to do if they're no longer typing
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return
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until = self._member_typing_until.get(member, None)
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if not until or until <= now:
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logger.info("Timing out typing for: %s", member.user_id)
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self._stopped_typing(member)
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return
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async def started_typing(self, target_user, requester, room_id, timeout):
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target_user_id = target_user.to_string()
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auth_user_id = requester.user.to_string()
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if not self.is_mine_id(target_user_id):
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raise SynapseError(400, "User is not hosted on this homeserver")
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if target_user_id != auth_user_id:
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raise AuthError(400, "Cannot set another user's typing state")
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if requester.shadow_banned:
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# We randomly sleep a bit just to annoy the requester.
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await self.clock.sleep(random.randint(1, 10))
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raise ShadowBanError()
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await self.auth.check_user_in_room(room_id, target_user_id)
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logger.debug("%s has started typing in %s", target_user_id, room_id)
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member = RoomMember(room_id=room_id, user_id=target_user_id)
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was_present = member.user_id in self._room_typing.get(room_id, set())
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now = self.clock.time_msec()
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self._member_typing_until[member] = now + timeout
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self.wheel_timer.insert(now=now, obj=member, then=now + timeout)
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if was_present:
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# No point sending another notification
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return None
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self._push_update(member=member, typing=True)
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async def stopped_typing(self, target_user, requester, room_id):
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target_user_id = target_user.to_string()
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auth_user_id = requester.user.to_string()
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if not self.is_mine_id(target_user_id):
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raise SynapseError(400, "User is not hosted on this homeserver")
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if target_user_id != auth_user_id:
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raise AuthError(400, "Cannot set another user's typing state")
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if requester.shadow_banned:
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# We randomly sleep a bit just to annoy the requester.
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await self.clock.sleep(random.randint(1, 10))
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raise ShadowBanError()
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await self.auth.check_user_in_room(room_id, target_user_id)
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logger.debug("%s has stopped typing in %s", target_user_id, room_id)
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member = RoomMember(room_id=room_id, user_id=target_user_id)
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self._stopped_typing(member)
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def user_left_room(self, user, room_id):
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user_id = user.to_string()
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if self.is_mine_id(user_id):
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member = RoomMember(room_id=room_id, user_id=user_id)
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self._stopped_typing(member)
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def _stopped_typing(self, member):
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if member.user_id not in self._room_typing.get(member.room_id, set()):
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# No point
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return None
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self._member_typing_until.pop(member, None)
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self._member_last_federation_poke.pop(member, None)
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self._push_update(member=member, typing=False)
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def _push_update(self, member, typing):
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if self.hs.is_mine_id(member.user_id):
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# Only send updates for changes to our own users.
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run_as_background_process(
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"typing._push_remote", self._push_remote, member, typing
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)
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self._push_update_local(member=member, typing=typing)
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async def _recv_edu(self, origin, content):
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room_id = content["room_id"]
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user_id = content["user_id"]
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member = RoomMember(user_id=user_id, room_id=room_id)
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# Check that the string is a valid user id
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user = UserID.from_string(user_id)
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if user.domain != origin:
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logger.info(
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"Got typing update from %r with bad 'user_id': %r", origin, user_id
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)
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return
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users = await self.store.get_users_in_room(room_id)
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domains = {get_domain_from_id(u) for u in users}
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if self.server_name in domains:
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logger.info("Got typing update from %s: %r", user_id, content)
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now = self.clock.time_msec()
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self._member_typing_until[member] = now + FEDERATION_TIMEOUT
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self.wheel_timer.insert(now=now, obj=member, then=now + FEDERATION_TIMEOUT)
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self._push_update_local(member=member, typing=content["typing"])
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def _push_update_local(self, member, typing):
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room_set = self._room_typing.setdefault(member.room_id, set())
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if typing:
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room_set.add(member.user_id)
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else:
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room_set.discard(member.user_id)
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self._latest_room_serial += 1
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self._room_serials[member.room_id] = self._latest_room_serial
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self._typing_stream_change_cache.entity_has_changed(
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member.room_id, self._latest_room_serial
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)
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self.notifier.on_new_event(
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"typing_key", self._latest_room_serial, rooms=[member.room_id]
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)
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async def get_all_typing_updates(
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self, instance_name: str, last_id: int, current_id: int, limit: int
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) -> Tuple[List[Tuple[int, list]], int, bool]:
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"""Get updates for typing replication stream.
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Args:
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instance_name: The writer we want to fetch updates from. Unused
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here since there is only ever one writer.
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last_id: The token to fetch updates from. Exclusive.
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current_id: The token to fetch updates up to. Inclusive.
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limit: The requested limit for the number of rows to return. The
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function may return more or fewer rows.
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Returns:
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A tuple consisting of: the updates, a token to use to fetch
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subsequent updates, and whether we returned fewer rows than exists
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between the requested tokens due to the limit.
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The token returned can be used in a subsequent call to this
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function to get further updatees.
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The updates are a list of 2-tuples of stream ID and the row data
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"""
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if last_id == current_id:
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return [], current_id, False
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changed_rooms = self._typing_stream_change_cache.get_all_entities_changed(
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last_id
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)
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if changed_rooms is None:
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changed_rooms = self._room_serials
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rows = []
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for room_id in changed_rooms:
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serial = self._room_serials[room_id]
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if last_id < serial <= current_id:
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typing = self._room_typing[room_id]
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rows.append((serial, [room_id, list(typing)]))
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rows.sort()
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limited = False
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# We, unusually, use a strict limit here as we have all the rows in
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# memory rather than pulling them out of the database with a `LIMIT ?`
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# clause.
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if len(rows) > limit:
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rows = rows[:limit]
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current_id = rows[-1][0]
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limited = True
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return rows, current_id, limited
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def process_replication_rows(
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self, token: int, rows: List[TypingStream.TypingStreamRow]
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):
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# The writing process should never get updates from replication.
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raise Exception("Typing writer instance got typing info over replication")
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class TypingNotificationEventSource:
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def __init__(self, hs):
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self.hs = hs
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self.clock = hs.get_clock()
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# We can't call get_typing_handler here because there's a cycle:
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#
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# Typing -> Notifier -> TypingNotificationEventSource -> Typing
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#
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self.get_typing_handler = hs.get_typing_handler
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def _make_event_for(self, room_id):
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typing = self.get_typing_handler()._room_typing[room_id]
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return {
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"type": "m.typing",
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"room_id": room_id,
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"content": {"user_ids": list(typing)},
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}
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async def get_new_events(self, from_key, room_ids, **kwargs):
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with Measure(self.clock, "typing.get_new_events"):
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from_key = int(from_key)
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handler = self.get_typing_handler()
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events = []
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for room_id in room_ids:
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if room_id not in handler._room_serials:
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continue
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if handler._room_serials[room_id] <= from_key:
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continue
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events.append(self._make_event_for(room_id))
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return (events, handler._latest_room_serial)
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def get_current_key(self):
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return self.get_typing_handler()._latest_room_serial
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