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1346 lines
50 KiB
Python
1346 lines
50 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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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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"""This module is responsible for keeping track of presence status of local
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and remote users.
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The methods that define policy are:
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- PresenceHandler._update_states
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- PresenceHandler._handle_timeouts
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- should_notify
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"""
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import abc
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import logging
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from contextlib import contextmanager
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from typing import TYPE_CHECKING, Dict, Iterable, List, Set, Tuple
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from prometheus_client import Counter
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from typing_extensions import ContextManager
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import synapse.metrics
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from synapse.api.constants import EventTypes, Membership, PresenceState
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from synapse.api.errors import SynapseError
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from synapse.api.presence import UserPresenceState
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from synapse.logging.context import run_in_background
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from synapse.logging.utils import log_function
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from synapse.metrics import LaterGauge
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.state import StateHandler
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from synapse.storage.databases.main import DataStore
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from synapse.types import Collection, JsonDict, UserID, get_domain_from_id
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from synapse.util.async_helpers import Linearizer
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from synapse.util.caches.descriptors import cached
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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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notified_presence_counter = Counter("synapse_handler_presence_notified_presence", "")
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federation_presence_out_counter = Counter(
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"synapse_handler_presence_federation_presence_out", ""
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)
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presence_updates_counter = Counter("synapse_handler_presence_presence_updates", "")
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timers_fired_counter = Counter("synapse_handler_presence_timers_fired", "")
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federation_presence_counter = Counter(
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"synapse_handler_presence_federation_presence", ""
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)
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bump_active_time_counter = Counter("synapse_handler_presence_bump_active_time", "")
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get_updates_counter = Counter("synapse_handler_presence_get_updates", "", ["type"])
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notify_reason_counter = Counter(
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"synapse_handler_presence_notify_reason", "", ["reason"]
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)
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state_transition_counter = Counter(
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"synapse_handler_presence_state_transition", "", ["from", "to"]
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)
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# If a user was last active in the last LAST_ACTIVE_GRANULARITY, consider them
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# "currently_active"
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LAST_ACTIVE_GRANULARITY = 60 * 1000
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# How long to wait until a new /events or /sync request before assuming
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# the client has gone.
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SYNC_ONLINE_TIMEOUT = 30 * 1000
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# How long to wait before marking the user as idle. Compared against last active
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IDLE_TIMER = 5 * 60 * 1000
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# How often we expect remote servers to resend us presence.
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FEDERATION_TIMEOUT = 30 * 60 * 1000
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# How often to resend presence to remote servers
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FEDERATION_PING_INTERVAL = 25 * 60 * 1000
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# How long we will wait before assuming that the syncs from an external process
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# are dead.
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EXTERNAL_PROCESS_EXPIRY = 5 * 60 * 1000
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assert LAST_ACTIVE_GRANULARITY < IDLE_TIMER
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class BasePresenceHandler(abc.ABC):
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"""Parts of the PresenceHandler that are shared between workers and master"""
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def __init__(self, hs: "HomeServer"):
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self.clock = hs.get_clock()
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self.store = hs.get_datastore()
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active_presence = self.store.take_presence_startup_info()
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self.user_to_current_state = {state.user_id: state for state in active_presence}
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@abc.abstractmethod
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async def user_syncing(
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self, user_id: str, affect_presence: bool
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) -> ContextManager[None]:
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"""Returns a context manager that should surround any stream requests
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from the user.
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This allows us to keep track of who is currently streaming and who isn't
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without having to have timers outside of this module to avoid flickering
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when users disconnect/reconnect.
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Args:
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user_id: the user that is starting a sync
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affect_presence: If false this function will be a no-op.
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Useful for streams that are not associated with an actual
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client that is being used by a user.
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"""
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@abc.abstractmethod
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def get_currently_syncing_users_for_replication(self) -> Iterable[str]:
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"""Get an iterable of syncing users on this worker, to send to the presence handler
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This is called when a replication connection is established. It should return
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a list of user ids, which are then sent as USER_SYNC commands to inform the
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process handling presence about those users.
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Returns:
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An iterable of user_id strings.
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"""
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async def get_state(self, target_user: UserID) -> UserPresenceState:
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results = await self.get_states([target_user.to_string()])
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return results[0]
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async def get_states(
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self, target_user_ids: Iterable[str]
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) -> List[UserPresenceState]:
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"""Get the presence state for users."""
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updates_d = await self.current_state_for_users(target_user_ids)
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updates = list(updates_d.values())
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for user_id in set(target_user_ids) - {u.user_id for u in updates}:
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updates.append(UserPresenceState.default(user_id))
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return updates
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async def current_state_for_users(
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self, user_ids: Iterable[str]
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) -> Dict[str, UserPresenceState]:
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"""Get the current presence state for multiple users.
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Returns:
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dict: `user_id` -> `UserPresenceState`
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"""
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states = {
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user_id: self.user_to_current_state.get(user_id, None)
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for user_id in user_ids
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}
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missing = [user_id for user_id, state in states.items() if not state]
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if missing:
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# There are things not in our in memory cache. Lets pull them out of
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# the database.
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res = await self.store.get_presence_for_users(missing)
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states.update(res)
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missing = [user_id for user_id, state in states.items() if not state]
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if missing:
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new = {
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user_id: UserPresenceState.default(user_id) for user_id in missing
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}
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states.update(new)
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self.user_to_current_state.update(new)
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return states
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@abc.abstractmethod
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async def set_state(
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self, target_user: UserID, state: JsonDict, ignore_status_msg: bool = False
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) -> None:
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"""Set the presence state of the user. """
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@abc.abstractmethod
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async def bump_presence_active_time(self, user: UserID):
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"""We've seen the user do something that indicates they're interacting
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with the app.
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"""
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class PresenceHandler(BasePresenceHandler):
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def __init__(self, hs: "HomeServer"):
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super().__init__(hs)
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self.hs = hs
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self.is_mine_id = hs.is_mine_id
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self.server_name = hs.hostname
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self.wheel_timer = WheelTimer()
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self.notifier = hs.get_notifier()
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self.federation = hs.get_federation_sender()
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self.state = hs.get_state_handler()
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self._presence_enabled = hs.config.use_presence
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federation_registry = hs.get_federation_registry()
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federation_registry.register_edu_handler("m.presence", self.incoming_presence)
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LaterGauge(
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"synapse_handlers_presence_user_to_current_state_size",
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"",
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[],
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lambda: len(self.user_to_current_state),
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)
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now = self.clock.time_msec()
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for state in self.user_to_current_state.values():
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self.wheel_timer.insert(
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now=now, obj=state.user_id, then=state.last_active_ts + IDLE_TIMER
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)
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self.wheel_timer.insert(
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now=now,
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obj=state.user_id,
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then=state.last_user_sync_ts + SYNC_ONLINE_TIMEOUT,
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)
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if self.is_mine_id(state.user_id):
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self.wheel_timer.insert(
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now=now,
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obj=state.user_id,
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then=state.last_federation_update_ts + FEDERATION_PING_INTERVAL,
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)
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else:
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self.wheel_timer.insert(
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now=now,
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obj=state.user_id,
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then=state.last_federation_update_ts + FEDERATION_TIMEOUT,
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)
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# Set of users who have presence in the `user_to_current_state` that
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# have not yet been persisted
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self.unpersisted_users_changes = set() # type: Set[str]
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hs.get_reactor().addSystemEventTrigger(
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"before",
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"shutdown",
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run_as_background_process,
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"presence.on_shutdown",
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self._on_shutdown,
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)
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self._next_serial = 1
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# Keeps track of the number of *ongoing* syncs on this process. While
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# this is non zero a user will never go offline.
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self.user_to_num_current_syncs = {} # type: Dict[str, int]
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# Keeps track of the number of *ongoing* syncs on other processes.
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# While any sync is ongoing on another process the user will never
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# go offline.
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# Each process has a unique identifier and an update frequency. If
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# no update is received from that process within the update period then
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# we assume that all the sync requests on that process have stopped.
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# Stored as a dict from process_id to set of user_id, and a dict of
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# process_id to millisecond timestamp last updated.
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self.external_process_to_current_syncs = {} # type: Dict[int, Set[str]]
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self.external_process_last_updated_ms = {} # type: Dict[int, int]
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self.external_sync_linearizer = Linearizer(name="external_sync_linearizer")
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# Start a LoopingCall in 30s that fires every 5s.
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# The initial delay is to allow disconnected clients a chance to
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# reconnect before we treat them as offline.
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def run_timeout_handler():
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return run_as_background_process(
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"handle_presence_timeouts", self._handle_timeouts
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)
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self.clock.call_later(30, self.clock.looping_call, run_timeout_handler, 5000)
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def run_persister():
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return run_as_background_process(
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"persist_presence_changes", self._persist_unpersisted_changes
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)
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self.clock.call_later(60, self.clock.looping_call, run_persister, 60 * 1000)
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LaterGauge(
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"synapse_handlers_presence_wheel_timer_size",
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"",
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[],
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lambda: len(self.wheel_timer),
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)
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# Used to handle sending of presence to newly joined users/servers
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if hs.config.use_presence:
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self.notifier.add_replication_callback(self.notify_new_event)
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# Presence is best effort and quickly heals itself, so lets just always
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# stream from the current state when we restart.
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self._event_pos = self.store.get_current_events_token()
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self._event_processing = False
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async def _on_shutdown(self):
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"""Gets called when shutting down. This lets us persist any updates that
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we haven't yet persisted, e.g. updates that only changes some internal
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timers. This allows changes to persist across startup without having to
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persist every single change.
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If this does not run it simply means that some of the timers will fire
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earlier than they should when synapse is restarted. This affect of this
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is some spurious presence changes that will self-correct.
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"""
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# If the DB pool has already terminated, don't try updating
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if not self.store.db_pool.is_running():
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return
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logger.info(
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"Performing _on_shutdown. Persisting %d unpersisted changes",
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len(self.user_to_current_state),
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)
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if self.unpersisted_users_changes:
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await self.store.update_presence(
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[
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self.user_to_current_state[user_id]
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for user_id in self.unpersisted_users_changes
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]
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)
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logger.info("Finished _on_shutdown")
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async def _persist_unpersisted_changes(self):
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"""We periodically persist the unpersisted changes, as otherwise they
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may stack up and slow down shutdown times.
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"""
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unpersisted = self.unpersisted_users_changes
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self.unpersisted_users_changes = set()
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if unpersisted:
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logger.info("Persisting %d unpersisted presence updates", len(unpersisted))
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await self.store.update_presence(
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[self.user_to_current_state[user_id] for user_id in unpersisted]
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)
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async def _update_states(self, new_states):
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"""Updates presence of users. Sets the appropriate timeouts. Pokes
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the notifier and federation if and only if the changed presence state
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should be sent to clients/servers.
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"""
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now = self.clock.time_msec()
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with Measure(self.clock, "presence_update_states"):
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# NOTE: We purposefully don't await between now and when we've
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# calculated what we want to do with the new states, to avoid races.
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to_notify = {} # Changes we want to notify everyone about
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to_federation_ping = {} # These need sending keep-alives
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# Only bother handling the last presence change for each user
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new_states_dict = {}
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for new_state in new_states:
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new_states_dict[new_state.user_id] = new_state
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new_state = new_states_dict.values()
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for new_state in new_states:
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user_id = new_state.user_id
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# Its fine to not hit the database here, as the only thing not in
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# the current state cache are OFFLINE states, where the only field
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# of interest is last_active which is safe enough to assume is 0
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# here.
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prev_state = self.user_to_current_state.get(
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user_id, UserPresenceState.default(user_id)
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)
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new_state, should_notify, should_ping = handle_update(
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prev_state,
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new_state,
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is_mine=self.is_mine_id(user_id),
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wheel_timer=self.wheel_timer,
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now=now,
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)
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self.user_to_current_state[user_id] = new_state
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if should_notify:
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to_notify[user_id] = new_state
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elif should_ping:
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to_federation_ping[user_id] = new_state
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# TODO: We should probably ensure there are no races hereafter
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presence_updates_counter.inc(len(new_states))
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if to_notify:
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notified_presence_counter.inc(len(to_notify))
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await self._persist_and_notify(list(to_notify.values()))
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self.unpersisted_users_changes |= {s.user_id for s in new_states}
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self.unpersisted_users_changes -= set(to_notify.keys())
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to_federation_ping = {
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user_id: state
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for user_id, state in to_federation_ping.items()
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if user_id not in to_notify
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}
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if to_federation_ping:
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federation_presence_out_counter.inc(len(to_federation_ping))
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self._push_to_remotes(to_federation_ping.values())
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async def _handle_timeouts(self):
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"""Checks the presence of users that have timed out and updates as
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appropriate.
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"""
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logger.debug("Handling presence timeouts")
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now = self.clock.time_msec()
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# Fetch the list of users that *may* have timed out. Things may have
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# changed since the timeout was set, so we won't necessarily have to
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# take any action.
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users_to_check = set(self.wheel_timer.fetch(now))
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# Check whether the lists of syncing processes from an external
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# process have expired.
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expired_process_ids = [
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process_id
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for process_id, last_update in self.external_process_last_updated_ms.items()
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if now - last_update > EXTERNAL_PROCESS_EXPIRY
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]
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for process_id in expired_process_ids:
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# For each expired process drop tracking info and check the users
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# that were syncing on that process to see if they need to be timed
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# out.
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users_to_check.update(
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self.external_process_to_current_syncs.pop(process_id, ())
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)
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self.external_process_last_updated_ms.pop(process_id)
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states = [
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self.user_to_current_state.get(user_id, UserPresenceState.default(user_id))
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for user_id in users_to_check
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]
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timers_fired_counter.inc(len(states))
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syncing_user_ids = {
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user_id
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for user_id, count in self.user_to_num_current_syncs.items()
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if count
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}
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for user_ids in self.external_process_to_current_syncs.values():
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syncing_user_ids.update(user_ids)
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changes = handle_timeouts(
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states,
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is_mine_fn=self.is_mine_id,
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syncing_user_ids=syncing_user_ids,
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now=now,
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)
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return await self._update_states(changes)
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async def bump_presence_active_time(self, user):
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"""We've seen the user do something that indicates they're interacting
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with the app.
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"""
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# If presence is disabled, no-op
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if not self.hs.config.use_presence:
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return
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user_id = user.to_string()
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bump_active_time_counter.inc()
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prev_state = await self.current_state_for_user(user_id)
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new_fields = {"last_active_ts": self.clock.time_msec()}
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if prev_state.state == PresenceState.UNAVAILABLE:
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new_fields["state"] = PresenceState.ONLINE
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await self._update_states([prev_state.copy_and_replace(**new_fields)])
|
|
|
|
async def user_syncing(
|
|
self, user_id: str, affect_presence: bool = True
|
|
) -> ContextManager[None]:
|
|
"""Returns a context manager that should surround any stream requests
|
|
from the user.
|
|
|
|
This allows us to keep track of who is currently streaming and who isn't
|
|
without having to have timers outside of this module to avoid flickering
|
|
when users disconnect/reconnect.
|
|
|
|
Args:
|
|
user_id (str)
|
|
affect_presence (bool): If false this function will be a no-op.
|
|
Useful for streams that are not associated with an actual
|
|
client that is being used by a user.
|
|
"""
|
|
# Override if it should affect the user's presence, if presence is
|
|
# disabled.
|
|
if not self.hs.config.use_presence:
|
|
affect_presence = False
|
|
|
|
if affect_presence:
|
|
curr_sync = self.user_to_num_current_syncs.get(user_id, 0)
|
|
self.user_to_num_current_syncs[user_id] = curr_sync + 1
|
|
|
|
prev_state = await self.current_state_for_user(user_id)
|
|
if prev_state.state == PresenceState.OFFLINE:
|
|
# If they're currently offline then bring them online, otherwise
|
|
# just update the last sync times.
|
|
await self._update_states(
|
|
[
|
|
prev_state.copy_and_replace(
|
|
state=PresenceState.ONLINE,
|
|
last_active_ts=self.clock.time_msec(),
|
|
last_user_sync_ts=self.clock.time_msec(),
|
|
)
|
|
]
|
|
)
|
|
else:
|
|
await self._update_states(
|
|
[
|
|
prev_state.copy_and_replace(
|
|
last_user_sync_ts=self.clock.time_msec()
|
|
)
|
|
]
|
|
)
|
|
|
|
async def _end():
|
|
try:
|
|
self.user_to_num_current_syncs[user_id] -= 1
|
|
|
|
prev_state = await self.current_state_for_user(user_id)
|
|
await self._update_states(
|
|
[
|
|
prev_state.copy_and_replace(
|
|
last_user_sync_ts=self.clock.time_msec()
|
|
)
|
|
]
|
|
)
|
|
except Exception:
|
|
logger.exception("Error updating presence after sync")
|
|
|
|
@contextmanager
|
|
def _user_syncing():
|
|
try:
|
|
yield
|
|
finally:
|
|
if affect_presence:
|
|
run_in_background(_end)
|
|
|
|
return _user_syncing()
|
|
|
|
def get_currently_syncing_users_for_replication(self) -> Iterable[str]:
|
|
# since we are the process handling presence, there is nothing to do here.
|
|
return []
|
|
|
|
async def update_external_syncs_row(
|
|
self, process_id, user_id, is_syncing, sync_time_msec
|
|
):
|
|
"""Update the syncing users for an external process as a delta.
|
|
|
|
Args:
|
|
process_id (str): An identifier for the process the users are
|
|
syncing against. This allows synapse to process updates
|
|
as user start and stop syncing against a given process.
|
|
user_id (str): The user who has started or stopped syncing
|
|
is_syncing (bool): Whether or not the user is now syncing
|
|
sync_time_msec(int): Time in ms when the user was last syncing
|
|
"""
|
|
with (await self.external_sync_linearizer.queue(process_id)):
|
|
prev_state = await self.current_state_for_user(user_id)
|
|
|
|
process_presence = self.external_process_to_current_syncs.setdefault(
|
|
process_id, set()
|
|
)
|
|
|
|
updates = []
|
|
if is_syncing and user_id not in process_presence:
|
|
if prev_state.state == PresenceState.OFFLINE:
|
|
updates.append(
|
|
prev_state.copy_and_replace(
|
|
state=PresenceState.ONLINE,
|
|
last_active_ts=sync_time_msec,
|
|
last_user_sync_ts=sync_time_msec,
|
|
)
|
|
)
|
|
else:
|
|
updates.append(
|
|
prev_state.copy_and_replace(last_user_sync_ts=sync_time_msec)
|
|
)
|
|
process_presence.add(user_id)
|
|
elif user_id in process_presence:
|
|
updates.append(
|
|
prev_state.copy_and_replace(last_user_sync_ts=sync_time_msec)
|
|
)
|
|
|
|
if not is_syncing:
|
|
process_presence.discard(user_id)
|
|
|
|
if updates:
|
|
await self._update_states(updates)
|
|
|
|
self.external_process_last_updated_ms[process_id] = self.clock.time_msec()
|
|
|
|
async def update_external_syncs_clear(self, process_id):
|
|
"""Marks all users that had been marked as syncing by a given process
|
|
as offline.
|
|
|
|
Used when the process has stopped/disappeared.
|
|
"""
|
|
with (await self.external_sync_linearizer.queue(process_id)):
|
|
process_presence = self.external_process_to_current_syncs.pop(
|
|
process_id, set()
|
|
)
|
|
prev_states = await self.current_state_for_users(process_presence)
|
|
time_now_ms = self.clock.time_msec()
|
|
|
|
await self._update_states(
|
|
[
|
|
prev_state.copy_and_replace(last_user_sync_ts=time_now_ms)
|
|
for prev_state in prev_states.values()
|
|
]
|
|
)
|
|
self.external_process_last_updated_ms.pop(process_id, None)
|
|
|
|
async def current_state_for_user(self, user_id):
|
|
"""Get the current presence state for a user."""
|
|
res = await self.current_state_for_users([user_id])
|
|
return res[user_id]
|
|
|
|
async def _persist_and_notify(self, states):
|
|
"""Persist states in the database, poke the notifier and send to
|
|
interested remote servers
|
|
"""
|
|
stream_id, max_token = await self.store.update_presence(states)
|
|
|
|
parties = await get_interested_parties(self.store, states)
|
|
room_ids_to_states, users_to_states = parties
|
|
|
|
self.notifier.on_new_event(
|
|
"presence_key",
|
|
stream_id,
|
|
rooms=room_ids_to_states.keys(),
|
|
users=[UserID.from_string(u) for u in users_to_states],
|
|
)
|
|
|
|
self._push_to_remotes(states)
|
|
|
|
async def notify_for_states(self, state, stream_id):
|
|
parties = await get_interested_parties(self.store, [state])
|
|
room_ids_to_states, users_to_states = parties
|
|
|
|
self.notifier.on_new_event(
|
|
"presence_key",
|
|
stream_id,
|
|
rooms=room_ids_to_states.keys(),
|
|
users=[UserID.from_string(u) for u in users_to_states],
|
|
)
|
|
|
|
def _push_to_remotes(self, states):
|
|
"""Sends state updates to remote servers.
|
|
|
|
Args:
|
|
states (list(UserPresenceState))
|
|
"""
|
|
self.federation.send_presence(states)
|
|
|
|
async def incoming_presence(self, origin, content):
|
|
"""Called when we receive a `m.presence` EDU from a remote server."""
|
|
if not self._presence_enabled:
|
|
return
|
|
|
|
now = self.clock.time_msec()
|
|
updates = []
|
|
for push in content.get("push", []):
|
|
# A "push" contains a list of presence that we are probably interested
|
|
# in.
|
|
user_id = push.get("user_id", None)
|
|
if not user_id:
|
|
logger.info(
|
|
"Got presence update from %r with no 'user_id': %r", origin, push
|
|
)
|
|
continue
|
|
|
|
if get_domain_from_id(user_id) != origin:
|
|
logger.info(
|
|
"Got presence update from %r with bad 'user_id': %r",
|
|
origin,
|
|
user_id,
|
|
)
|
|
continue
|
|
|
|
presence_state = push.get("presence", None)
|
|
if not presence_state:
|
|
logger.info(
|
|
"Got presence update from %r with no 'presence_state': %r",
|
|
origin,
|
|
push,
|
|
)
|
|
continue
|
|
|
|
new_fields = {"state": presence_state, "last_federation_update_ts": now}
|
|
|
|
last_active_ago = push.get("last_active_ago", None)
|
|
if last_active_ago is not None:
|
|
new_fields["last_active_ts"] = now - last_active_ago
|
|
|
|
new_fields["status_msg"] = push.get("status_msg", None)
|
|
new_fields["currently_active"] = push.get("currently_active", False)
|
|
|
|
prev_state = await self.current_state_for_user(user_id)
|
|
updates.append(prev_state.copy_and_replace(**new_fields))
|
|
|
|
if updates:
|
|
federation_presence_counter.inc(len(updates))
|
|
await self._update_states(updates)
|
|
|
|
async def set_state(self, target_user, state, ignore_status_msg=False):
|
|
"""Set the presence state of the user."""
|
|
status_msg = state.get("status_msg", None)
|
|
presence = state["presence"]
|
|
|
|
valid_presence = (
|
|
PresenceState.ONLINE,
|
|
PresenceState.UNAVAILABLE,
|
|
PresenceState.OFFLINE,
|
|
)
|
|
if presence not in valid_presence:
|
|
raise SynapseError(400, "Invalid presence state")
|
|
|
|
user_id = target_user.to_string()
|
|
|
|
prev_state = await self.current_state_for_user(user_id)
|
|
|
|
new_fields = {"state": presence}
|
|
|
|
if not ignore_status_msg:
|
|
msg = status_msg if presence != PresenceState.OFFLINE else None
|
|
new_fields["status_msg"] = msg
|
|
|
|
if presence == PresenceState.ONLINE:
|
|
new_fields["last_active_ts"] = self.clock.time_msec()
|
|
|
|
await self._update_states([prev_state.copy_and_replace(**new_fields)])
|
|
|
|
async def is_visible(self, observed_user, observer_user):
|
|
"""Returns whether a user can see another user's presence."""
|
|
observer_room_ids = await self.store.get_rooms_for_user(
|
|
observer_user.to_string()
|
|
)
|
|
observed_room_ids = await self.store.get_rooms_for_user(
|
|
observed_user.to_string()
|
|
)
|
|
|
|
if observer_room_ids & observed_room_ids:
|
|
return True
|
|
|
|
return False
|
|
|
|
async def get_all_presence_updates(
|
|
self, instance_name: str, last_id: int, current_id: int, limit: int
|
|
) -> Tuple[List[Tuple[int, list]], int, bool]:
|
|
"""
|
|
Gets a list of presence update rows from between the given stream ids.
|
|
Each row has:
|
|
- stream_id(str)
|
|
- user_id(str)
|
|
- state(str)
|
|
- last_active_ts(int)
|
|
- last_federation_update_ts(int)
|
|
- last_user_sync_ts(int)
|
|
- status_msg(int)
|
|
- currently_active(int)
|
|
|
|
Args:
|
|
instance_name: The writer we want to fetch updates from. Unused
|
|
here since there is only ever one writer.
|
|
last_id: The token to fetch updates from. Exclusive.
|
|
current_id: The token to fetch updates up to. Inclusive.
|
|
limit: The requested limit for the number of rows to return. The
|
|
function may return more or fewer rows.
|
|
|
|
Returns:
|
|
A tuple consisting of: the updates, a token to use to fetch
|
|
subsequent updates, and whether we returned fewer rows than exists
|
|
between the requested tokens due to the limit.
|
|
|
|
The token returned can be used in a subsequent call to this
|
|
function to get further updates.
|
|
|
|
The updates are a list of 2-tuples of stream ID and the row data
|
|
"""
|
|
|
|
# TODO(markjh): replicate the unpersisted changes.
|
|
# This could use the in-memory stores for recent changes.
|
|
rows = await self.store.get_all_presence_updates(
|
|
instance_name, last_id, current_id, limit
|
|
)
|
|
return rows
|
|
|
|
def notify_new_event(self):
|
|
"""Called when new events have happened. Handles users and servers
|
|
joining rooms and require being sent presence.
|
|
"""
|
|
|
|
if self._event_processing:
|
|
return
|
|
|
|
async def _process_presence():
|
|
assert not self._event_processing
|
|
|
|
self._event_processing = True
|
|
try:
|
|
await self._unsafe_process()
|
|
finally:
|
|
self._event_processing = False
|
|
|
|
run_as_background_process("presence.notify_new_event", _process_presence)
|
|
|
|
async def _unsafe_process(self):
|
|
# Loop round handling deltas until we're up to date
|
|
while True:
|
|
with Measure(self.clock, "presence_delta"):
|
|
room_max_stream_ordering = self.store.get_room_max_stream_ordering()
|
|
if self._event_pos == room_max_stream_ordering:
|
|
return
|
|
|
|
logger.debug(
|
|
"Processing presence stats %s->%s",
|
|
self._event_pos,
|
|
room_max_stream_ordering,
|
|
)
|
|
max_pos, deltas = await self.store.get_current_state_deltas(
|
|
self._event_pos, room_max_stream_ordering
|
|
)
|
|
await self._handle_state_delta(deltas)
|
|
|
|
self._event_pos = max_pos
|
|
|
|
# Expose current event processing position to prometheus
|
|
synapse.metrics.event_processing_positions.labels("presence").set(
|
|
max_pos
|
|
)
|
|
|
|
async def _handle_state_delta(self, deltas):
|
|
"""Process current state deltas to find new joins that need to be
|
|
handled.
|
|
"""
|
|
for delta in deltas:
|
|
typ = delta["type"]
|
|
state_key = delta["state_key"]
|
|
room_id = delta["room_id"]
|
|
event_id = delta["event_id"]
|
|
prev_event_id = delta["prev_event_id"]
|
|
|
|
logger.debug("Handling: %r %r, %s", typ, state_key, event_id)
|
|
|
|
if typ != EventTypes.Member:
|
|
continue
|
|
|
|
if event_id is None:
|
|
# state has been deleted, so this is not a join. We only care about
|
|
# joins.
|
|
continue
|
|
|
|
event = await self.store.get_event(event_id, allow_none=True)
|
|
if not event or event.content.get("membership") != Membership.JOIN:
|
|
# We only care about joins
|
|
continue
|
|
|
|
if prev_event_id:
|
|
prev_event = await self.store.get_event(prev_event_id, allow_none=True)
|
|
if (
|
|
prev_event
|
|
and prev_event.content.get("membership") == Membership.JOIN
|
|
):
|
|
# Ignore changes to join events.
|
|
continue
|
|
|
|
await self._on_user_joined_room(room_id, state_key)
|
|
|
|
async def _on_user_joined_room(self, room_id: str, user_id: str) -> None:
|
|
"""Called when we detect a user joining the room via the current state
|
|
delta stream.
|
|
"""
|
|
|
|
if self.is_mine_id(user_id):
|
|
# If this is a local user then we need to send their presence
|
|
# out to hosts in the room (who don't already have it)
|
|
|
|
# TODO: We should be able to filter the hosts down to those that
|
|
# haven't previously seen the user
|
|
|
|
state = await self.current_state_for_user(user_id)
|
|
hosts = await self.state.get_current_hosts_in_room(room_id)
|
|
|
|
# Filter out ourselves.
|
|
hosts = {host for host in hosts if host != self.server_name}
|
|
|
|
self.federation.send_presence_to_destinations(
|
|
states=[state], destinations=hosts
|
|
)
|
|
else:
|
|
# A remote user has joined the room, so we need to:
|
|
# 1. Check if this is a new server in the room
|
|
# 2. If so send any presence they don't already have for
|
|
# local users in the room.
|
|
|
|
# TODO: We should be able to filter the users down to those that
|
|
# the server hasn't previously seen
|
|
|
|
# TODO: Check that this is actually a new server joining the
|
|
# room.
|
|
|
|
users = await self.state.get_current_users_in_room(room_id)
|
|
user_ids = list(filter(self.is_mine_id, users))
|
|
|
|
states_d = await self.current_state_for_users(user_ids)
|
|
|
|
# Filter out old presence, i.e. offline presence states where
|
|
# the user hasn't been active for a week. We can change this
|
|
# depending on what we want the UX to be, but at the least we
|
|
# should filter out offline presence where the state is just the
|
|
# default state.
|
|
now = self.clock.time_msec()
|
|
states = [
|
|
state
|
|
for state in states_d.values()
|
|
if state.state != PresenceState.OFFLINE
|
|
or now - state.last_active_ts < 7 * 24 * 60 * 60 * 1000
|
|
or state.status_msg is not None
|
|
]
|
|
|
|
if states:
|
|
self.federation.send_presence_to_destinations(
|
|
states=states, destinations=[get_domain_from_id(user_id)]
|
|
)
|
|
|
|
|
|
def should_notify(old_state, new_state):
|
|
"""Decides if a presence state change should be sent to interested parties."""
|
|
if old_state == new_state:
|
|
return False
|
|
|
|
if old_state.status_msg != new_state.status_msg:
|
|
notify_reason_counter.labels("status_msg_change").inc()
|
|
return True
|
|
|
|
if old_state.state != new_state.state:
|
|
notify_reason_counter.labels("state_change").inc()
|
|
state_transition_counter.labels(old_state.state, new_state.state).inc()
|
|
return True
|
|
|
|
if old_state.state == PresenceState.ONLINE:
|
|
if new_state.currently_active != old_state.currently_active:
|
|
notify_reason_counter.labels("current_active_change").inc()
|
|
return True
|
|
|
|
if (
|
|
new_state.last_active_ts - old_state.last_active_ts
|
|
> LAST_ACTIVE_GRANULARITY
|
|
):
|
|
# Only notify about last active bumps if we're not currently active
|
|
if not new_state.currently_active:
|
|
notify_reason_counter.labels("last_active_change_online").inc()
|
|
return True
|
|
|
|
elif new_state.last_active_ts - old_state.last_active_ts > LAST_ACTIVE_GRANULARITY:
|
|
# Always notify for a transition where last active gets bumped.
|
|
notify_reason_counter.labels("last_active_change_not_online").inc()
|
|
return True
|
|
|
|
return False
|
|
|
|
|
|
def format_user_presence_state(state, now, include_user_id=True):
|
|
"""Convert UserPresenceState to a format that can be sent down to clients
|
|
and to other servers.
|
|
|
|
The "user_id" is optional so that this function can be used to format presence
|
|
updates for client /sync responses and for federation /send requests.
|
|
"""
|
|
content = {"presence": state.state}
|
|
if include_user_id:
|
|
content["user_id"] = state.user_id
|
|
if state.last_active_ts:
|
|
content["last_active_ago"] = now - state.last_active_ts
|
|
if state.status_msg and state.state != PresenceState.OFFLINE:
|
|
content["status_msg"] = state.status_msg
|
|
if state.state == PresenceState.ONLINE:
|
|
content["currently_active"] = state.currently_active
|
|
|
|
return content
|
|
|
|
|
|
class PresenceEventSource:
|
|
def __init__(self, hs: "HomeServer"):
|
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# We can't call get_presence_handler here because there's a cycle:
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#
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# Presence -> Notifier -> PresenceEventSource -> Presence
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#
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self.get_presence_handler = hs.get_presence_handler
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self.clock = hs.get_clock()
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self.store = hs.get_datastore()
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self.state = hs.get_state_handler()
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@log_function
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async def get_new_events(
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self,
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user,
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from_key,
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room_ids=None,
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include_offline=True,
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explicit_room_id=None,
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**kwargs
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):
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# The process for getting presence events are:
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# 1. Get the rooms the user is in.
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# 2. Get the list of user in the rooms.
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# 3. Get the list of users that are in the user's presence list.
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# 4. If there is a from_key set, cross reference the list of users
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# with the `presence_stream_cache` to see which ones we actually
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# need to check.
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# 5. Load current state for the users.
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#
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# We don't try and limit the presence updates by the current token, as
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# sending down the rare duplicate is not a concern.
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with Measure(self.clock, "presence.get_new_events"):
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if from_key is not None:
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from_key = int(from_key)
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max_token = self.store.get_current_presence_token()
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if from_key == max_token:
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# This is necessary as due to the way stream ID generators work
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# we may get updates that have a stream ID greater than the max
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# token (e.g. max_token is N but stream generator may return
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# results for N+2, due to N+1 not having finished being
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# persisted yet).
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#
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# This is usually fine, as it just means that we may send down
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# some presence updates multiple times. However, we need to be
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# careful that the sync stream either actually does make some
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# progress or doesn't return, otherwise clients will end up
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# tight looping calling /sync due to it immediately returning
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# the same token repeatedly.
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#
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# Hence this guard where we just return nothing so that the sync
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# doesn't return. C.f. #5503.
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return [], max_token
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presence = self.get_presence_handler()
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stream_change_cache = self.store.presence_stream_cache
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users_interested_in = await self._get_interested_in(user, explicit_room_id)
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user_ids_changed = set() # type: Collection[str]
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changed = None
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if from_key:
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changed = stream_change_cache.get_all_entities_changed(from_key)
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if changed is not None and len(changed) < 500:
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assert isinstance(user_ids_changed, set)
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# For small deltas, its quicker to get all changes and then
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# work out if we share a room or they're in our presence list
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get_updates_counter.labels("stream").inc()
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for other_user_id in changed:
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if other_user_id in users_interested_in:
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user_ids_changed.add(other_user_id)
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else:
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# Too many possible updates. Find all users we can see and check
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# if any of them have changed.
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get_updates_counter.labels("full").inc()
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if from_key:
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user_ids_changed = stream_change_cache.get_entities_changed(
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users_interested_in, from_key
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)
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else:
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user_ids_changed = users_interested_in
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updates = await presence.current_state_for_users(user_ids_changed)
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if include_offline:
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return (list(updates.values()), max_token)
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else:
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return (
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[s for s in updates.values() if s.state != PresenceState.OFFLINE],
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max_token,
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)
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def get_current_key(self):
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return self.store.get_current_presence_token()
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@cached(num_args=2, cache_context=True)
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async def _get_interested_in(self, user, explicit_room_id, cache_context):
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"""Returns the set of users that the given user should see presence
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updates for
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"""
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user_id = user.to_string()
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users_interested_in = set()
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users_interested_in.add(user_id) # So that we receive our own presence
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users_who_share_room = await self.store.get_users_who_share_room_with_user(
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user_id, on_invalidate=cache_context.invalidate
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)
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users_interested_in.update(users_who_share_room)
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if explicit_room_id:
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user_ids = await self.store.get_users_in_room(
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explicit_room_id, on_invalidate=cache_context.invalidate
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)
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users_interested_in.update(user_ids)
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return users_interested_in
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def handle_timeouts(user_states, is_mine_fn, syncing_user_ids, now):
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"""Checks the presence of users that have timed out and updates as
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appropriate.
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Args:
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user_states(list): List of UserPresenceState's to check.
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is_mine_fn (fn): Function that returns if a user_id is ours
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syncing_user_ids (set): Set of user_ids with active syncs.
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now (int): Current time in ms.
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Returns:
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List of UserPresenceState updates
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"""
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changes = {} # Actual changes we need to notify people about
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for state in user_states:
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is_mine = is_mine_fn(state.user_id)
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new_state = handle_timeout(state, is_mine, syncing_user_ids, now)
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if new_state:
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changes[state.user_id] = new_state
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return list(changes.values())
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def handle_timeout(state, is_mine, syncing_user_ids, now):
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"""Checks the presence of the user to see if any of the timers have elapsed
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Args:
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state (UserPresenceState)
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is_mine (bool): Whether the user is ours
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syncing_user_ids (set): Set of user_ids with active syncs.
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now (int): Current time in ms.
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Returns:
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A UserPresenceState update or None if no update.
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"""
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if state.state == PresenceState.OFFLINE:
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# No timeouts are associated with offline states.
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return None
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changed = False
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user_id = state.user_id
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if is_mine:
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if state.state == PresenceState.ONLINE:
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if now - state.last_active_ts > IDLE_TIMER:
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# Currently online, but last activity ages ago so auto
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# idle
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state = state.copy_and_replace(state=PresenceState.UNAVAILABLE)
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changed = True
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elif now - state.last_active_ts > LAST_ACTIVE_GRANULARITY:
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# So that we send down a notification that we've
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# stopped updating.
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changed = True
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if now - state.last_federation_update_ts > FEDERATION_PING_INTERVAL:
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# Need to send ping to other servers to ensure they don't
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# timeout and set us to offline
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changed = True
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# If there are have been no sync for a while (and none ongoing),
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# set presence to offline
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if user_id not in syncing_user_ids:
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# If the user has done something recently but hasn't synced,
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# don't set them as offline.
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sync_or_active = max(state.last_user_sync_ts, state.last_active_ts)
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if now - sync_or_active > SYNC_ONLINE_TIMEOUT:
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state = state.copy_and_replace(
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state=PresenceState.OFFLINE, status_msg=None
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)
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changed = True
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else:
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# We expect to be poked occasionally by the other side.
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# This is to protect against forgetful/buggy servers, so that
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# no one gets stuck online forever.
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if now - state.last_federation_update_ts > FEDERATION_TIMEOUT:
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# The other side seems to have disappeared.
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state = state.copy_and_replace(state=PresenceState.OFFLINE, status_msg=None)
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changed = True
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return state if changed else None
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def handle_update(prev_state, new_state, is_mine, wheel_timer, now):
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"""Given a presence update:
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1. Add any appropriate timers.
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2. Check if we should notify anyone.
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Args:
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prev_state (UserPresenceState)
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new_state (UserPresenceState)
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is_mine (bool): Whether the user is ours
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wheel_timer (WheelTimer)
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now (int): Time now in ms
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Returns:
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3-tuple: `(new_state, persist_and_notify, federation_ping)` where:
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- new_state: is the state to actually persist
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- persist_and_notify (bool): whether to persist and notify people
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- federation_ping (bool): whether we should send a ping over federation
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"""
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user_id = new_state.user_id
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persist_and_notify = False
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federation_ping = False
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# If the users are ours then we want to set up a bunch of timers
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# to time things out.
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if is_mine:
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if new_state.state == PresenceState.ONLINE:
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# Idle timer
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wheel_timer.insert(
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now=now, obj=user_id, then=new_state.last_active_ts + IDLE_TIMER
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)
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active = now - new_state.last_active_ts < LAST_ACTIVE_GRANULARITY
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new_state = new_state.copy_and_replace(currently_active=active)
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if active:
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wheel_timer.insert(
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now=now,
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obj=user_id,
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then=new_state.last_active_ts + LAST_ACTIVE_GRANULARITY,
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)
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if new_state.state != PresenceState.OFFLINE:
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# User has stopped syncing
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wheel_timer.insert(
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now=now,
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obj=user_id,
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then=new_state.last_user_sync_ts + SYNC_ONLINE_TIMEOUT,
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)
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last_federate = new_state.last_federation_update_ts
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if now - last_federate > FEDERATION_PING_INTERVAL:
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# Been a while since we've poked remote servers
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new_state = new_state.copy_and_replace(last_federation_update_ts=now)
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federation_ping = True
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else:
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wheel_timer.insert(
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now=now,
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obj=user_id,
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then=new_state.last_federation_update_ts + FEDERATION_TIMEOUT,
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)
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# Check whether the change was something worth notifying about
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if should_notify(prev_state, new_state):
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new_state = new_state.copy_and_replace(last_federation_update_ts=now)
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persist_and_notify = True
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return new_state, persist_and_notify, federation_ping
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async def get_interested_parties(
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store: DataStore, states: List[UserPresenceState]
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) -> Tuple[Dict[str, List[UserPresenceState]], Dict[str, List[UserPresenceState]]]:
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"""Given a list of states return which entities (rooms, users)
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are interested in the given states.
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Args:
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store
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states
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Returns:
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A 2-tuple of `(room_ids_to_states, users_to_states)`,
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with each item being a dict of `entity_name` -> `[UserPresenceState]`
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"""
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room_ids_to_states = {} # type: Dict[str, List[UserPresenceState]]
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users_to_states = {} # type: Dict[str, List[UserPresenceState]]
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for state in states:
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room_ids = await store.get_rooms_for_user(state.user_id)
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for room_id in room_ids:
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room_ids_to_states.setdefault(room_id, []).append(state)
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# Always notify self
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users_to_states.setdefault(state.user_id, []).append(state)
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return room_ids_to_states, users_to_states
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|
|
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async def get_interested_remotes(
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store: DataStore, states: List[UserPresenceState], state_handler: StateHandler
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) -> List[Tuple[Collection[str], List[UserPresenceState]]]:
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"""Given a list of presence states figure out which remote servers
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should be sent which.
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|
All the presence states should be for local users only.
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|
Args:
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store
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states
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state_handler
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|
Returns:
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A list of 2-tuples of destinations and states, where for
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each tuple the list of UserPresenceState should be sent to each
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destination
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"""
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hosts_and_states = [] # type: List[Tuple[Collection[str], List[UserPresenceState]]]
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# First we look up the rooms each user is in (as well as any explicit
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# subscriptions), then for each distinct room we look up the remote
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# hosts in those rooms.
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room_ids_to_states, users_to_states = await get_interested_parties(store, states)
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for room_id, states in room_ids_to_states.items():
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hosts = await state_handler.get_current_hosts_in_room(room_id)
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hosts_and_states.append((hosts, states))
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for user_id, states in users_to_states.items():
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host = get_domain_from_id(user_id)
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hosts_and_states.append(([host], states))
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return hosts_and_states
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