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- # Copyright 2014-2016 OpenMarket Ltd
- # Copyright 2020 The Matrix.org Foundation C.I.C.
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- """This module is responsible for keeping track of presence status of local
- and remote users.
- The methods that define policy are:
- - PresenceHandler._update_states
- - PresenceHandler._handle_timeouts
- - should_notify
- """
- import abc
- import contextlib
- import logging
- from bisect import bisect
- from contextlib import contextmanager
- from types import TracebackType
- from typing import (
- TYPE_CHECKING,
- Any,
- Awaitable,
- Callable,
- Collection,
- Dict,
- Generator,
- Iterable,
- List,
- Optional,
- Set,
- Tuple,
- Type,
- )
- from prometheus_client import Counter
- from typing_extensions import ContextManager
- import synapse.metrics
- from synapse.api.constants import EduTypes, EventTypes, Membership, PresenceState
- from synapse.api.errors import SynapseError
- from synapse.api.presence import UserPresenceState
- from synapse.appservice import ApplicationService
- from synapse.events.presence_router import PresenceRouter
- from synapse.logging.context import run_in_background
- from synapse.metrics import LaterGauge
- from synapse.metrics.background_process_metrics import run_as_background_process
- from synapse.replication.http.presence import (
- ReplicationBumpPresenceActiveTime,
- ReplicationPresenceSetState,
- )
- from synapse.replication.http.streams import ReplicationGetStreamUpdates
- from synapse.replication.tcp.commands import ClearUserSyncsCommand
- from synapse.replication.tcp.streams import PresenceFederationStream, PresenceStream
- from synapse.storage.databases.main import DataStore
- from synapse.streams import EventSource
- from synapse.types import JsonDict, StreamKeyType, UserID, get_domain_from_id
- from synapse.util.async_helpers import Linearizer
- from synapse.util.metrics import Measure
- from synapse.util.wheel_timer import WheelTimer
- if TYPE_CHECKING:
- from synapse.server import HomeServer
- logger = logging.getLogger(__name__)
- notified_presence_counter = Counter("synapse_handler_presence_notified_presence", "")
- federation_presence_out_counter = Counter(
- "synapse_handler_presence_federation_presence_out", ""
- )
- presence_updates_counter = Counter("synapse_handler_presence_presence_updates", "")
- timers_fired_counter = Counter("synapse_handler_presence_timers_fired", "")
- federation_presence_counter = Counter(
- "synapse_handler_presence_federation_presence", ""
- )
- bump_active_time_counter = Counter("synapse_handler_presence_bump_active_time", "")
- get_updates_counter = Counter("synapse_handler_presence_get_updates", "", ["type"])
- notify_reason_counter = Counter(
- "synapse_handler_presence_notify_reason", "", ["reason"]
- )
- state_transition_counter = Counter(
- "synapse_handler_presence_state_transition", "", ["from", "to"]
- )
- # If a user was last active in the last LAST_ACTIVE_GRANULARITY, consider them
- # "currently_active"
- LAST_ACTIVE_GRANULARITY = 60 * 1000
- # How long to wait until a new /events or /sync request before assuming
- # the client has gone.
- SYNC_ONLINE_TIMEOUT = 30 * 1000
- # How long to wait before marking the user as idle. Compared against last active
- IDLE_TIMER = 5 * 60 * 1000
- # How often we expect remote servers to resend us presence.
- FEDERATION_TIMEOUT = 30 * 60 * 1000
- # How often to resend presence to remote servers
- FEDERATION_PING_INTERVAL = 25 * 60 * 1000
- # How long we will wait before assuming that the syncs from an external process
- # are dead.
- EXTERNAL_PROCESS_EXPIRY = 5 * 60 * 1000
- # Delay before a worker tells the presence handler that a user has stopped
- # syncing.
- UPDATE_SYNCING_USERS_MS = 10 * 1000
- assert LAST_ACTIVE_GRANULARITY < IDLE_TIMER
- class BasePresenceHandler(abc.ABC):
- """Parts of the PresenceHandler that are shared between workers and presence
- writer"""
- def __init__(self, hs: "HomeServer"):
- self.clock = hs.get_clock()
- self.store = hs.get_datastores().main
- self._storage_controllers = hs.get_storage_controllers()
- self.presence_router = hs.get_presence_router()
- self.state = hs.get_state_handler()
- self.is_mine_id = hs.is_mine_id
- self._federation = None
- if hs.should_send_federation():
- self._federation = hs.get_federation_sender()
- self._federation_queue = PresenceFederationQueue(hs, self)
- self._busy_presence_enabled = hs.config.experimental.msc3026_enabled
- active_presence = self.store.take_presence_startup_info()
- self.user_to_current_state = {state.user_id: state for state in active_presence}
- @abc.abstractmethod
- async def user_syncing(
- self, user_id: str, affect_presence: bool, presence_state: str
- ) -> 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: the user that is starting a sync
- affect_presence: 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.
- presence_state: The presence state indicated in the sync request
- """
- @abc.abstractmethod
- def get_currently_syncing_users_for_replication(self) -> Iterable[str]:
- """Get an iterable of syncing users on this worker, to send to the presence handler
- This is called when a replication connection is established. It should return
- a list of user ids, which are then sent as USER_SYNC commands to inform the
- process handling presence about those users.
- Returns:
- An iterable of user_id strings.
- """
- async def get_state(self, target_user: UserID) -> UserPresenceState:
- results = await self.get_states([target_user.to_string()])
- return results[0]
- async def get_states(
- self, target_user_ids: Iterable[str]
- ) -> List[UserPresenceState]:
- """Get the presence state for users."""
- updates_d = await self.current_state_for_users(target_user_ids)
- updates = list(updates_d.values())
- for user_id in set(target_user_ids) - {u.user_id for u in updates}:
- updates.append(UserPresenceState.default(user_id))
- return updates
- async def current_state_for_users(
- self, user_ids: Iterable[str]
- ) -> Dict[str, UserPresenceState]:
- """Get the current presence state for multiple users.
- Returns:
- A mapping of `user_id` -> `UserPresenceState`
- """
- states = {}
- missing = []
- for user_id in user_ids:
- state = self.user_to_current_state.get(user_id, None)
- if state:
- states[user_id] = state
- else:
- missing.append(user_id)
- if missing:
- # There are things not in our in memory cache. Lets pull them out of
- # the database.
- res = await self.store.get_presence_for_users(missing)
- states.update(res)
- for user_id in missing:
- # if user has no state in database, create the state
- if not res.get(user_id, None):
- new_state = UserPresenceState.default(user_id)
- states[user_id] = new_state
- self.user_to_current_state[user_id] = new_state
- return states
- async def current_state_for_user(self, user_id: str) -> UserPresenceState:
- """Get the current presence state for a user."""
- res = await self.current_state_for_users([user_id])
- return res[user_id]
- @abc.abstractmethod
- async def set_state(
- self,
- target_user: UserID,
- state: JsonDict,
- ignore_status_msg: bool = False,
- force_notify: bool = False,
- ) -> None:
- """Set the presence state of the user.
- Args:
- target_user: The ID of the user to set the presence state of.
- state: The presence state as a JSON dictionary.
- ignore_status_msg: True to ignore the "status_msg" field of the `state` dict.
- If False, the user's current status will be updated.
- force_notify: Whether to force notification of the update to clients.
- """
- @abc.abstractmethod
- async def bump_presence_active_time(self, user: UserID) -> None:
- """We've seen the user do something that indicates they're interacting
- with the app.
- """
- async def update_external_syncs_row( # noqa: B027 (no-op by design)
- self, process_id: str, user_id: str, is_syncing: bool, sync_time_msec: int
- ) -> None:
- """Update the syncing users for an external process as a delta.
- This is a no-op when presence is handled by a different worker.
- Args:
- process_id: 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: The user who has started or stopped syncing
- is_syncing: Whether or not the user is now syncing
- sync_time_msec: Time in ms when the user was last syncing
- """
- async def update_external_syncs_clear( # noqa: B027 (no-op by design)
- self, process_id: str
- ) -> None:
- """Marks all users that had been marked as syncing by a given process
- as offline.
- Used when the process has stopped/disappeared.
- This is a no-op when presence is handled by a different worker.
- """
- async def process_replication_rows(
- self, stream_name: str, instance_name: str, token: int, rows: list
- ) -> None:
- """Process streams received over replication."""
- await self._federation_queue.process_replication_rows(
- stream_name, instance_name, token, rows
- )
- def get_federation_queue(self) -> "PresenceFederationQueue":
- """Get the presence federation queue."""
- return self._federation_queue
- async def maybe_send_presence_to_interested_destinations(
- self, states: List[UserPresenceState]
- ) -> None:
- """If this instance is a federation sender, send the states to all
- destinations that are interested. Filters out any states for remote
- users.
- """
- if not self._federation:
- return
- states = [s for s in states if self.is_mine_id(s.user_id)]
- if not states:
- return
- hosts_to_states = await get_interested_remotes(
- self.store,
- self.presence_router,
- states,
- )
- for destination, host_states in hosts_to_states.items():
- self._federation.send_presence_to_destinations(host_states, [destination])
- async def send_full_presence_to_users(self, user_ids: Collection[str]) -> None:
- """
- Adds to the list of users who should receive a full snapshot of presence
- upon their next sync. Note that this only works for local users.
- Then, grabs the current presence state for a given set of users and adds it
- to the top of the presence stream.
- Args:
- user_ids: The IDs of the local users to send full presence to.
- """
- # Retrieve one of the users from the given set
- if not user_ids:
- raise Exception(
- "send_full_presence_to_users must be called with at least one user"
- )
- user_id = next(iter(user_ids))
- # Mark all users as receiving full presence on their next sync
- await self.store.add_users_to_send_full_presence_to(user_ids)
- # Add a new entry to the presence stream. Since we use stream tokens to determine whether a
- # local user should receive a full snapshot of presence when they sync, we need to bump the
- # presence stream so that subsequent syncs with no presence activity in between won't result
- # in the client receiving multiple full snapshots of presence.
- #
- # If we bump the stream ID, then the user will get a higher stream token next sync, and thus
- # correctly won't receive a second snapshot.
- # Get the current presence state for one of the users (defaults to offline if not found)
- current_presence_state = await self.get_state(UserID.from_string(user_id))
- # Convert the UserPresenceState object into a serializable dict
- state = {
- "presence": current_presence_state.state,
- "status_message": current_presence_state.status_msg,
- }
- # Copy the presence state to the tip of the presence stream.
- # We set force_notify=True here so that this presence update is guaranteed to
- # increment the presence stream ID (which resending the current user's presence
- # otherwise would not do).
- await self.set_state(UserID.from_string(user_id), state, force_notify=True)
- async def is_visible(self, observed_user: UserID, observer_user: UserID) -> bool:
- raise NotImplementedError(
- "Attempting to check presence on a non-presence worker."
- )
- class _NullContextManager(ContextManager[None]):
- """A context manager which does nothing."""
- def __exit__(
- self,
- exc_type: Optional[Type[BaseException]],
- exc_val: Optional[BaseException],
- exc_tb: Optional[TracebackType],
- ) -> None:
- pass
- class WorkerPresenceHandler(BasePresenceHandler):
- def __init__(self, hs: "HomeServer"):
- super().__init__(hs)
- self.hs = hs
- self._presence_writer_instance = hs.config.worker.writers.presence[0]
- self._presence_enabled = hs.config.server.use_presence
- # Route presence EDUs to the right worker
- hs.get_federation_registry().register_instances_for_edu(
- EduTypes.PRESENCE,
- hs.config.worker.writers.presence,
- )
- # The number of ongoing syncs on this process, by user id.
- # Empty if _presence_enabled is false.
- self._user_to_num_current_syncs: Dict[str, int] = {}
- self.notifier = hs.get_notifier()
- self.instance_id = hs.get_instance_id()
- # user_id -> last_sync_ms. Lists the users that have stopped syncing but
- # we haven't notified the presence writer of that yet
- self.users_going_offline: Dict[str, int] = {}
- self._bump_active_client = ReplicationBumpPresenceActiveTime.make_client(hs)
- self._set_state_client = ReplicationPresenceSetState.make_client(hs)
- self._send_stop_syncing_loop = self.clock.looping_call(
- self.send_stop_syncing, UPDATE_SYNCING_USERS_MS
- )
- self._busy_presence_enabled = hs.config.experimental.msc3026_enabled
- hs.get_reactor().addSystemEventTrigger(
- "before",
- "shutdown",
- run_as_background_process,
- "generic_presence.on_shutdown",
- self._on_shutdown,
- )
- async def _on_shutdown(self) -> None:
- if self._presence_enabled:
- self.hs.get_replication_command_handler().send_command(
- ClearUserSyncsCommand(self.instance_id)
- )
- def send_user_sync(self, user_id: str, is_syncing: bool, last_sync_ms: int) -> None:
- if self._presence_enabled:
- self.hs.get_replication_command_handler().send_user_sync(
- self.instance_id, user_id, is_syncing, last_sync_ms
- )
- def mark_as_coming_online(self, user_id: str) -> None:
- """A user has started syncing. Send a UserSync to the presence writer,
- unless they had recently stopped syncing.
- """
- going_offline = self.users_going_offline.pop(user_id, None)
- if not going_offline:
- # Safe to skip because we haven't yet told the presence writer they
- # were offline
- self.send_user_sync(user_id, True, self.clock.time_msec())
- def mark_as_going_offline(self, user_id: str) -> None:
- """A user has stopped syncing. We wait before notifying the presence
- writer as its likely they'll come back soon. This allows us to avoid
- sending a stopped syncing immediately followed by a started syncing
- notification to the presence writer
- """
- self.users_going_offline[user_id] = self.clock.time_msec()
- def send_stop_syncing(self) -> None:
- """Check if there are any users who have stopped syncing a while ago and
- haven't come back yet. If there are poke the presence writer about them.
- """
- now = self.clock.time_msec()
- for user_id, last_sync_ms in list(self.users_going_offline.items()):
- if now - last_sync_ms > UPDATE_SYNCING_USERS_MS:
- self.users_going_offline.pop(user_id, None)
- self.send_user_sync(user_id, False, last_sync_ms)
- async def user_syncing(
- self, user_id: str, affect_presence: bool, presence_state: str
- ) -> ContextManager[None]:
- """Record that a user is syncing.
- Called by the sync and events servlets to record that a user has connected to
- this worker and is waiting for some events.
- """
- if not affect_presence or not self._presence_enabled:
- return _NullContextManager()
- prev_state = await self.current_state_for_user(user_id)
- if prev_state.state != PresenceState.BUSY:
- # We set state here but pass ignore_status_msg = True as we don't want to
- # cause the status message to be cleared.
- # Note that this causes last_active_ts to be incremented which is not
- # what the spec wants: see comment in the BasePresenceHandler version
- # of this function.
- await self.set_state(
- UserID.from_string(user_id), {"presence": presence_state}, True
- )
- curr_sync = self._user_to_num_current_syncs.get(user_id, 0)
- self._user_to_num_current_syncs[user_id] = curr_sync + 1
- # If we went from no in flight sync to some, notify replication
- if self._user_to_num_current_syncs[user_id] == 1:
- self.mark_as_coming_online(user_id)
- def _end() -> None:
- # We check that the user_id is in user_to_num_current_syncs because
- # user_to_num_current_syncs may have been cleared if we are
- # shutting down.
- if user_id in self._user_to_num_current_syncs:
- self._user_to_num_current_syncs[user_id] -= 1
- # If we went from one in flight sync to non, notify replication
- if self._user_to_num_current_syncs[user_id] == 0:
- self.mark_as_going_offline(user_id)
- @contextlib.contextmanager
- def _user_syncing() -> Generator[None, None, None]:
- try:
- yield
- finally:
- _end()
- return _user_syncing()
- async def notify_from_replication(
- self, states: List[UserPresenceState], stream_id: int
- ) -> None:
- parties = await get_interested_parties(self.store, self.presence_router, states)
- room_ids_to_states, users_to_states = parties
- self.notifier.on_new_event(
- StreamKeyType.PRESENCE,
- stream_id,
- rooms=room_ids_to_states.keys(),
- users=users_to_states.keys(),
- )
- async def process_replication_rows(
- self, stream_name: str, instance_name: str, token: int, rows: list
- ) -> None:
- await super().process_replication_rows(stream_name, instance_name, token, rows)
- if stream_name != PresenceStream.NAME:
- return
- states = [
- UserPresenceState(
- row.user_id,
- row.state,
- row.last_active_ts,
- row.last_federation_update_ts,
- row.last_user_sync_ts,
- row.status_msg,
- row.currently_active,
- )
- for row in rows
- ]
- # The list of states to notify sync streams and remote servers about.
- # This is calculated by comparing the old and new states for each user
- # using `should_notify(..)`.
- #
- # Note that this is necessary as the presence writer will periodically
- # flush presence state changes that should not be notified about to the
- # DB, and so will be sent over the replication stream.
- state_to_notify = []
- for new_state in states:
- old_state = self.user_to_current_state.get(new_state.user_id)
- self.user_to_current_state[new_state.user_id] = new_state
- if not old_state or should_notify(old_state, new_state):
- state_to_notify.append(new_state)
- stream_id = token
- await self.notify_from_replication(state_to_notify, stream_id)
- # If this is a federation sender, notify about presence updates.
- await self.maybe_send_presence_to_interested_destinations(state_to_notify)
- def get_currently_syncing_users_for_replication(self) -> Iterable[str]:
- return [
- user_id
- for user_id, count in self._user_to_num_current_syncs.items()
- if count > 0
- ]
- async def set_state(
- self,
- target_user: UserID,
- state: JsonDict,
- ignore_status_msg: bool = False,
- force_notify: bool = False,
- ) -> None:
- """Set the presence state of the user.
- Args:
- target_user: The ID of the user to set the presence state of.
- state: The presence state as a JSON dictionary.
- ignore_status_msg: True to ignore the "status_msg" field of the `state` dict.
- If False, the user's current status will be updated.
- force_notify: Whether to force notification of the update to clients.
- """
- presence = state["presence"]
- valid_presence = (
- PresenceState.ONLINE,
- PresenceState.UNAVAILABLE,
- PresenceState.OFFLINE,
- PresenceState.BUSY,
- )
- if presence not in valid_presence or (
- presence == PresenceState.BUSY and not self._busy_presence_enabled
- ):
- raise SynapseError(400, "Invalid presence state")
- user_id = target_user.to_string()
- # If presence is disabled, no-op
- if not self.hs.config.server.use_presence:
- return
- # Proxy request to instance that writes presence
- await self._set_state_client(
- instance_name=self._presence_writer_instance,
- user_id=user_id,
- state=state,
- ignore_status_msg=ignore_status_msg,
- force_notify=force_notify,
- )
- async def bump_presence_active_time(self, user: UserID) -> None:
- """We've seen the user do something that indicates they're interacting
- with the app.
- """
- # If presence is disabled, no-op
- if not self.hs.config.server.use_presence:
- return
- # Proxy request to instance that writes presence
- user_id = user.to_string()
- await self._bump_active_client(
- instance_name=self._presence_writer_instance, user_id=user_id
- )
- class PresenceHandler(BasePresenceHandler):
- def __init__(self, hs: "HomeServer"):
- super().__init__(hs)
- self.hs = hs
- self.server_name = hs.hostname
- self.wheel_timer: WheelTimer[str] = WheelTimer()
- self.notifier = hs.get_notifier()
- self._presence_enabled = hs.config.server.use_presence
- federation_registry = hs.get_federation_registry()
- federation_registry.register_edu_handler(
- EduTypes.PRESENCE, self.incoming_presence
- )
- LaterGauge(
- "synapse_handlers_presence_user_to_current_state_size",
- "",
- [],
- lambda: len(self.user_to_current_state),
- )
- now = self.clock.time_msec()
- if self._presence_enabled:
- for state in self.user_to_current_state.values():
- self.wheel_timer.insert(
- now=now, obj=state.user_id, then=state.last_active_ts + IDLE_TIMER
- )
- self.wheel_timer.insert(
- now=now,
- obj=state.user_id,
- then=state.last_user_sync_ts + SYNC_ONLINE_TIMEOUT,
- )
- if self.is_mine_id(state.user_id):
- self.wheel_timer.insert(
- now=now,
- obj=state.user_id,
- then=state.last_federation_update_ts + FEDERATION_PING_INTERVAL,
- )
- else:
- self.wheel_timer.insert(
- now=now,
- obj=state.user_id,
- then=state.last_federation_update_ts + FEDERATION_TIMEOUT,
- )
- # Set of users who have presence in the `user_to_current_state` that
- # have not yet been persisted
- self.unpersisted_users_changes: Set[str] = set()
- hs.get_reactor().addSystemEventTrigger(
- "before",
- "shutdown",
- run_as_background_process,
- "presence.on_shutdown",
- self._on_shutdown,
- )
- self._next_serial = 1
- # Keeps track of the number of *ongoing* syncs on this process. While
- # this is non zero a user will never go offline.
- self.user_to_num_current_syncs: Dict[str, int] = {}
- # Keeps track of the number of *ongoing* syncs on other processes.
- # While any sync is ongoing on another process the user will never
- # go offline.
- # Each process has a unique identifier and an update frequency. If
- # no update is received from that process within the update period then
- # we assume that all the sync requests on that process have stopped.
- # Stored as a dict from process_id to set of user_id, and a dict of
- # process_id to millisecond timestamp last updated.
- self.external_process_to_current_syncs: Dict[str, Set[str]] = {}
- self.external_process_last_updated_ms: Dict[str, int] = {}
- self.external_sync_linearizer = Linearizer(name="external_sync_linearizer")
- if self._presence_enabled:
- # Start a LoopingCall in 30s that fires every 5s.
- # The initial delay is to allow disconnected clients a chance to
- # reconnect before we treat them as offline.
- def run_timeout_handler() -> Awaitable[None]:
- return run_as_background_process(
- "handle_presence_timeouts", self._handle_timeouts
- )
- self.clock.call_later(
- 30, self.clock.looping_call, run_timeout_handler, 5000
- )
- def run_persister() -> Awaitable[None]:
- return run_as_background_process(
- "persist_presence_changes", self._persist_unpersisted_changes
- )
- self.clock.call_later(60, self.clock.looping_call, run_persister, 60 * 1000)
- LaterGauge(
- "synapse_handlers_presence_wheel_timer_size",
- "",
- [],
- lambda: len(self.wheel_timer),
- )
- # Used to handle sending of presence to newly joined users/servers
- if self._presence_enabled:
- self.notifier.add_replication_callback(self.notify_new_event)
- # Presence is best effort and quickly heals itself, so lets just always
- # stream from the current state when we restart.
- self._event_pos = self.store.get_room_max_stream_ordering()
- self._event_processing = False
- async def _on_shutdown(self) -> None:
- """Gets called when shutting down. This lets us persist any updates that
- we haven't yet persisted, e.g. updates that only changes some internal
- timers. This allows changes to persist across startup without having to
- persist every single change.
- If this does not run it simply means that some of the timers will fire
- earlier than they should when synapse is restarted. This affect of this
- is some spurious presence changes that will self-correct.
- """
- # If the DB pool has already terminated, don't try updating
- if not self.store.db_pool.is_running():
- return
- logger.info(
- "Performing _on_shutdown. Persisting %d unpersisted changes",
- len(self.user_to_current_state),
- )
- if self.unpersisted_users_changes:
- await self.store.update_presence(
- [
- self.user_to_current_state[user_id]
- for user_id in self.unpersisted_users_changes
- ]
- )
- logger.info("Finished _on_shutdown")
- async def _persist_unpersisted_changes(self) -> None:
- """We periodically persist the unpersisted changes, as otherwise they
- may stack up and slow down shutdown times.
- """
- unpersisted = self.unpersisted_users_changes
- self.unpersisted_users_changes = set()
- if unpersisted:
- logger.info("Persisting %d unpersisted presence updates", len(unpersisted))
- await self.store.update_presence(
- [self.user_to_current_state[user_id] for user_id in unpersisted]
- )
- async def _update_states(
- self, new_states: Iterable[UserPresenceState], force_notify: bool = False
- ) -> None:
- """Updates presence of users. Sets the appropriate timeouts. Pokes
- the notifier and federation if and only if the changed presence state
- should be sent to clients/servers.
- Args:
- new_states: The new user presence state updates to process.
- force_notify: Whether to force notifying clients of this presence state update,
- even if it doesn't change the state of a user's presence (e.g online -> online).
- This is currently used to bump the max presence stream ID without changing any
- user's presence (see PresenceHandler.add_users_to_send_full_presence_to).
- """
- if not self._presence_enabled:
- # We shouldn't get here if presence is disabled, but we check anyway
- # to ensure that we don't a) send out presence federation and b)
- # don't add things to the wheel timer that will never be handled.
- logger.warning("Tried to update presence states when presence is disabled")
- return
- now = self.clock.time_msec()
- with Measure(self.clock, "presence_update_states"):
- # NOTE: We purposefully don't await between now and when we've
- # calculated what we want to do with the new states, to avoid races.
- to_notify = {} # Changes we want to notify everyone about
- to_federation_ping = {} # These need sending keep-alives
- # Only bother handling the last presence change for each user
- new_states_dict = {}
- for new_state in new_states:
- new_states_dict[new_state.user_id] = new_state
- new_states = new_states_dict.values()
- for new_state in new_states:
- user_id = new_state.user_id
- # Its fine to not hit the database here, as the only thing not in
- # the current state cache are OFFLINE states, where the only field
- # of interest is last_active which is safe enough to assume is 0
- # here.
- prev_state = self.user_to_current_state.get(
- user_id, UserPresenceState.default(user_id)
- )
- new_state, should_notify, should_ping = handle_update(
- prev_state,
- new_state,
- is_mine=self.is_mine_id(user_id),
- wheel_timer=self.wheel_timer,
- now=now,
- )
- if force_notify:
- should_notify = True
- self.user_to_current_state[user_id] = new_state
- if should_notify:
- to_notify[user_id] = new_state
- elif should_ping:
- to_federation_ping[user_id] = new_state
- # TODO: We should probably ensure there are no races hereafter
- presence_updates_counter.inc(len(new_states))
- if to_notify:
- notified_presence_counter.inc(len(to_notify))
- await self._persist_and_notify(list(to_notify.values()))
- self.unpersisted_users_changes |= {s.user_id for s in new_states}
- self.unpersisted_users_changes -= set(to_notify.keys())
- # Check if we need to resend any presence states to remote hosts. We
- # only do this for states that haven't been updated in a while to
- # ensure that the remote host doesn't time the presence state out.
- #
- # Note that since these are states that have *not* been updated,
- # they won't get sent down the normal presence replication stream,
- # and so we have to explicitly send them via the federation stream.
- to_federation_ping = {
- user_id: state
- for user_id, state in to_federation_ping.items()
- if user_id not in to_notify
- }
- if to_federation_ping:
- federation_presence_out_counter.inc(len(to_federation_ping))
- hosts_to_states = await get_interested_remotes(
- self.store,
- self.presence_router,
- list(to_federation_ping.values()),
- )
- for destination, states in hosts_to_states.items():
- self._federation_queue.send_presence_to_destinations(
- states, [destination]
- )
- async def _handle_timeouts(self) -> None:
- """Checks the presence of users that have timed out and updates as
- appropriate.
- """
- logger.debug("Handling presence timeouts")
- now = self.clock.time_msec()
- # Fetch the list of users that *may* have timed out. Things may have
- # changed since the timeout was set, so we won't necessarily have to
- # take any action.
- users_to_check = set(self.wheel_timer.fetch(now))
- # Check whether the lists of syncing processes from an external
- # process have expired.
- expired_process_ids = [
- process_id
- for process_id, last_update in self.external_process_last_updated_ms.items()
- if now - last_update > EXTERNAL_PROCESS_EXPIRY
- ]
- for process_id in expired_process_ids:
- # For each expired process drop tracking info and check the users
- # that were syncing on that process to see if they need to be timed
- # out.
- users_to_check.update(
- self.external_process_to_current_syncs.pop(process_id, ())
- )
- self.external_process_last_updated_ms.pop(process_id)
- states = [
- self.user_to_current_state.get(user_id, UserPresenceState.default(user_id))
- for user_id in users_to_check
- ]
- timers_fired_counter.inc(len(states))
- syncing_user_ids = {
- user_id
- for user_id, count in self.user_to_num_current_syncs.items()
- if count
- }
- for user_ids in self.external_process_to_current_syncs.values():
- syncing_user_ids.update(user_ids)
- changes = handle_timeouts(
- states,
- is_mine_fn=self.is_mine_id,
- syncing_user_ids=syncing_user_ids,
- now=now,
- )
- return await self._update_states(changes)
- async def bump_presence_active_time(self, user: UserID) -> None:
- """We've seen the user do something that indicates they're interacting
- with the app.
- """
- # If presence is disabled, no-op
- if not self.hs.config.server.use_presence:
- return
- user_id = user.to_string()
- bump_active_time_counter.inc()
- prev_state = await self.current_state_for_user(user_id)
- new_fields: Dict[str, Any] = {"last_active_ts": self.clock.time_msec()}
- if prev_state.state == PresenceState.UNAVAILABLE:
- new_fields["state"] = PresenceState.ONLINE
- await self._update_states([prev_state.copy_and_replace(**new_fields)])
- async def user_syncing(
- self,
- user_id: str,
- affect_presence: bool = True,
- presence_state: str = PresenceState.ONLINE,
- ) -> 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
- affect_presence: 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.
- presence_state: The presence state indicated in the sync request
- """
- # Override if it should affect the user's presence, if presence is
- # disabled.
- if not self.hs.config.server.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 they're busy then they don't stop being busy just by syncing,
- # so just update the last sync time.
- if prev_state.state != PresenceState.BUSY:
- # XXX: We set_state separately here and just update the last_active_ts above
- # This keeps the logic as similar as possible between the worker and single
- # process modes. Using set_state will actually cause last_active_ts to be
- # updated always, which is not what the spec calls for, but synapse has done
- # this for... forever, I think.
- await self.set_state(
- UserID.from_string(user_id), {"presence": presence_state}, True
- )
- # Retrieve the new state for the logic below. This should come from the
- # in-memory cache.
- prev_state = await self.current_state_for_user(user_id)
- # To keep the single process behaviour consistent with worker mode, run the
- # same logic as `update_external_syncs_row`, even though it looks weird.
- if prev_state.state == PresenceState.OFFLINE:
- 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(),
- )
- ]
- )
- # otherwise, set the new presence state & update the last sync time,
- # but don't update last_active_ts as this isn't an indication that
- # they've been active (even though it's probably been updated by
- # set_state above)
- else:
- await self._update_states(
- [
- prev_state.copy_and_replace(
- last_user_sync_ts=self.clock.time_msec()
- )
- ]
- )
- async def _end() -> None:
- 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() -> Generator[None, None, None]:
- 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: str, user_id: str, is_syncing: bool, sync_time_msec: int
- ) -> None:
- """Update the syncing users for an external process as a delta.
- Args:
- process_id: 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: The user who has started or stopped syncing
- is_syncing: Whether or not the user is now syncing
- sync_time_msec: Time in ms when the user was last syncing
- """
- async with 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: str) -> None:
- """Marks all users that had been marked as syncing by a given process
- as offline.
- Used when the process has stopped/disappeared.
- """
- async with 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 _persist_and_notify(self, states: List[UserPresenceState]) -> None:
- """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, self.presence_router, states)
- room_ids_to_states, users_to_states = parties
- self.notifier.on_new_event(
- StreamKeyType.PRESENCE,
- stream_id,
- rooms=room_ids_to_states.keys(),
- users=[UserID.from_string(u) for u in users_to_states],
- )
- # We only want to poke the local federation sender, if any, as other
- # workers will receive the presence updates via the presence replication
- # stream (which is updated by `store.update_presence`).
- await self.maybe_send_presence_to_interested_destinations(states)
- async def incoming_presence(self, origin: str, content: JsonDict) -> None:
- """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: UserID,
- state: JsonDict,
- ignore_status_msg: bool = False,
- force_notify: bool = False,
- ) -> None:
- """Set the presence state of the user.
- Args:
- target_user: The ID of the user to set the presence state of.
- state: The presence state as a JSON dictionary.
- ignore_status_msg: True to ignore the "status_msg" field of the `state` dict.
- If False, the user's current status will be updated.
- force_notify: Whether to force notification of the update to clients.
- """
- status_msg = state.get("status_msg", None)
- presence = state["presence"]
- valid_presence = (
- PresenceState.ONLINE,
- PresenceState.UNAVAILABLE,
- PresenceState.OFFLINE,
- PresenceState.BUSY,
- )
- if presence not in valid_presence or (
- presence == PresenceState.BUSY and not self._busy_presence_enabled
- ):
- raise SynapseError(400, "Invalid presence state")
- # If presence is disabled, no-op
- if not self.hs.config.server.use_presence:
- return
- 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:
- new_fields["status_msg"] = status_msg
- if presence == PresenceState.ONLINE or (
- presence == PresenceState.BUSY and self._busy_presence_enabled
- ):
- new_fields["last_active_ts"] = self.clock.time_msec()
- await self._update_states(
- [prev_state.copy_and_replace(**new_fields)], force_notify=force_notify
- )
- async def is_visible(self, observed_user: UserID, observer_user: UserID) -> bool:
- """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) -> None:
- """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() -> None:
- 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) -> None:
- # 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._storage_controllers.state.get_current_state_deltas(
- self._event_pos, room_max_stream_ordering
- )
- # We may get multiple deltas for different rooms, but we want to
- # handle them on a room by room basis, so we batch them up by
- # room.
- deltas_by_room: Dict[str, List[JsonDict]] = {}
- for delta in deltas:
- deltas_by_room.setdefault(delta["room_id"], []).append(delta)
- for room_id, deltas_for_room in deltas_by_room.items():
- await self._handle_state_delta(room_id, deltas_for_room)
- 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, room_id: str, deltas: List[JsonDict]) -> None:
- """Process current state deltas for the room to find new joins that need
- to be handled.
- """
- # Sets of newly joined users. Note that if the local server is
- # joining a remote room for the first time we'll see both the joining
- # user and all remote users as newly joined.
- newly_joined_users = set()
- for delta in deltas:
- assert room_id == delta["room_id"]
- typ = delta["type"]
- state_key = delta["state_key"]
- event_id = delta["event_id"]
- prev_event_id = delta["prev_event_id"]
- logger.debug("Handling: %r %r, %s", typ, state_key, event_id)
- # Drop any event that isn't a membership join
- 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
- newly_joined_users.add(state_key)
- if not newly_joined_users:
- # If nobody has joined then there's nothing to do.
- return
- # We want to send:
- # 1. presence states of all local users in the room to newly joined
- # remote servers
- # 2. presence states of newly joined users to all remote servers in
- # the room.
- #
- # TODO: Only send presence states to remote hosts that don't already
- # have them (because they already share rooms).
- # Get all the users who were already in the room, by fetching the
- # current users in the room and removing the newly joined users.
- users = await self.store.get_users_in_room(room_id)
- prev_users = set(users) - newly_joined_users
- # Construct sets for all the local users and remote hosts that were
- # already in the room
- prev_local_users = []
- prev_remote_hosts = set()
- for user_id in prev_users:
- if self.is_mine_id(user_id):
- prev_local_users.append(user_id)
- else:
- prev_remote_hosts.add(get_domain_from_id(user_id))
- # Similarly, construct sets for all the local users and remote hosts
- # that were *not* already in the room. Care needs to be taken with the
- # calculating the remote hosts, as a host may have already been in the
- # room even if there is a newly joined user from that host.
- newly_joined_local_users = []
- newly_joined_remote_hosts = set()
- for user_id in newly_joined_users:
- if self.is_mine_id(user_id):
- newly_joined_local_users.append(user_id)
- else:
- host = get_domain_from_id(user_id)
- if host not in prev_remote_hosts:
- newly_joined_remote_hosts.add(host)
- # Send presence states of all local users in the room to newly joined
- # remote servers. (We actually only send states for local users already
- # in the room, as we'll send states for newly joined local users below.)
- if prev_local_users and newly_joined_remote_hosts:
- local_states = await self.current_state_for_users(prev_local_users)
- # 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 local_states.values()
- if state.state != PresenceState.OFFLINE
- or now - state.last_active_ts < 7 * 24 * 60 * 60 * 1000
- or state.status_msg is not None
- ]
- self._federation_queue.send_presence_to_destinations(
- destinations=newly_joined_remote_hosts,
- states=states,
- )
- # Send presence states of newly joined users to all remote servers in
- # the room
- if newly_joined_local_users and (
- prev_remote_hosts or newly_joined_remote_hosts
- ):
- local_states = await self.current_state_for_users(newly_joined_local_users)
- self._federation_queue.send_presence_to_destinations(
- destinations=prev_remote_hosts | newly_joined_remote_hosts,
- states=list(local_states.values()),
- )
- def should_notify(old_state: UserPresenceState, new_state: UserPresenceState) -> bool:
- """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: UserPresenceState, now: int, include_user_id: bool = True
- ) -> JsonDict:
- """Convert UserPresenceState to a JSON format that can be sent down to clients
- and to other servers.
- Args:
- state: The user presence state to format.
- now: The current timestamp since the epoch in ms.
- include_user_id: Whether to include `user_id` in the returned dictionary.
- As this function can be used both to format presence updates for client /sync
- responses and for federation /send requests, only the latter needs the include
- the `user_id` field.
- Returns:
- A JSON dictionary with the following keys:
- * presence: The presence state as a str.
- * user_id: Optional. Included if `include_user_id` is truthy. The canonical
- Matrix ID of the user.
- * last_active_ago: Optional. Included if `last_active_ts` is set on `state`.
- The timestamp that the user was last active.
- * status_msg: Optional. Included if `status_msg` is set on `state`. The user's
- status.
- * currently_active: Optional. Included only if `state.state` is "online".
- Example:
- {
- "presence": "online",
- "user_id": "@alice:example.com",
- "last_active_ago": 16783813918,
- "status_msg": "Hello world!",
- "currently_active": True
- }
- """
- content: JsonDict = {"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:
- content["status_msg"] = state.status_msg
- if state.state == PresenceState.ONLINE:
- content["currently_active"] = state.currently_active
- return content
- class PresenceEventSource(EventSource[int, UserPresenceState]):
- def __init__(self, hs: "HomeServer"):
- # We can't call get_presence_handler here because there's a cycle:
- #
- # Presence -> Notifier -> PresenceEventSource -> Presence
- #
- # Same with get_presence_router:
- #
- # AuthHandler -> Notifier -> PresenceEventSource -> ModuleApi -> AuthHandler
- self.get_presence_handler = hs.get_presence_handler
- self.get_presence_router = hs.get_presence_router
- self.clock = hs.get_clock()
- self.store = hs.get_datastores().main
- async def get_new_events(
- self,
- user: UserID,
- from_key: Optional[int],
- # Having a default limit doesn't match the EventSource API, but some
- # callers do not provide it. It is unused in this class.
- limit: int = 0,
- room_ids: Optional[Collection[str]] = None,
- is_guest: bool = False,
- explicit_room_id: Optional[str] = None,
- include_offline: bool = True,
- service: Optional[ApplicationService] = None,
- ) -> Tuple[List[UserPresenceState], int]:
- # The process for getting presence events are:
- # 1. Get the rooms the user is in.
- # 2. Get the list of user in the rooms.
- # 3. Get the list of users that are in the user's presence list.
- # 4. If there is a from_key set, cross reference the list of users
- # with the `presence_stream_cache` to see which ones we actually
- # need to check.
- # 5. Load current state for the users.
- #
- # We don't try and limit the presence updates by the current token, as
- # sending down the rare duplicate is not a concern.
- user_id = user.to_string()
- stream_change_cache = self.store.presence_stream_cache
- with Measure(self.clock, "presence.get_new_events"):
- if from_key is not None:
- from_key = int(from_key)
- # Check if this user should receive all current, online user presence. We only
- # bother to do this if from_key is set, as otherwise the user will receive all
- # user presence anyways.
- if await self.store.should_user_receive_full_presence_with_token(
- user_id, from_key
- ):
- # This user has been specified by a module to receive all current, online
- # user presence. Removing from_key and setting include_offline to false
- # will do effectively this.
- from_key = None
- include_offline = False
- max_token = self.store.get_current_presence_token()
- if from_key == max_token:
- # This is necessary as due to the way stream ID generators work
- # we may get updates that have a stream ID greater than the max
- # token (e.g. max_token is N but stream generator may return
- # results for N+2, due to N+1 not having finished being
- # persisted yet).
- #
- # This is usually fine, as it just means that we may send down
- # some presence updates multiple times. However, we need to be
- # careful that the sync stream either actually does make some
- # progress or doesn't return, otherwise clients will end up
- # tight looping calling /sync due to it immediately returning
- # the same token repeatedly.
- #
- # Hence this guard where we just return nothing so that the sync
- # doesn't return. C.f. #5503.
- return [], max_token
- # Figure out which other users this user should explicitly receive
- # updates for
- additional_users_interested_in = (
- await self.get_presence_router().get_interested_users(user.to_string())
- )
- # We have a set of users that we're interested in the presence of. We want to
- # cross-reference that with the users that have actually changed their presence.
- # Check whether this user should see all user updates
- if additional_users_interested_in == PresenceRouter.ALL_USERS:
- # Provide presence state for all users
- presence_updates = await self._filter_all_presence_updates_for_user(
- user_id, include_offline, from_key
- )
- return presence_updates, max_token
- # Make mypy happy. users_interested_in should now be a set
- assert not isinstance(additional_users_interested_in, str)
- # We always care about our own presence.
- additional_users_interested_in.add(user_id)
- if explicit_room_id:
- user_ids = await self.store.get_users_in_room(explicit_room_id)
- additional_users_interested_in.update(user_ids)
- # The set of users that we're interested in and that have had a presence update.
- # We'll actually pull the presence updates for these users at the end.
- interested_and_updated_users: Collection[str]
- if from_key is not None:
- # First get all users that have had a presence update
- result = stream_change_cache.get_all_entities_changed(from_key)
- # Cross-reference users we're interested in with those that have had updates.
- if result.hit:
- updated_users = result.entities
- # If we have the full list of changes for presence we can
- # simply check which ones share a room with the user.
- get_updates_counter.labels("stream").inc()
- sharing_users = await self.store.do_users_share_a_room(
- user_id, updated_users
- )
- interested_and_updated_users = (
- sharing_users.union(additional_users_interested_in)
- ).intersection(updated_users)
- else:
- # Too many possible updates. Find all users we can see and check
- # if any of them have changed.
- get_updates_counter.labels("full").inc()
- users_interested_in = (
- await self.store.get_users_who_share_room_with_user(user_id)
- )
- users_interested_in.update(additional_users_interested_in)
- interested_and_updated_users = (
- stream_change_cache.get_entities_changed(
- users_interested_in, from_key
- )
- )
- else:
- # No from_key has been specified. Return the presence for all users
- # this user is interested in
- interested_and_updated_users = (
- await self.store.get_users_who_share_room_with_user(user_id)
- )
- interested_and_updated_users.update(additional_users_interested_in)
- # Retrieve the current presence state for each user
- users_to_state = await self.get_presence_handler().current_state_for_users(
- interested_and_updated_users
- )
- presence_updates = list(users_to_state.values())
- if not include_offline:
- # Filter out offline presence states
- presence_updates = self._filter_offline_presence_state(presence_updates)
- return presence_updates, max_token
- async def _filter_all_presence_updates_for_user(
- self,
- user_id: str,
- include_offline: bool,
- from_key: Optional[int] = None,
- ) -> List[UserPresenceState]:
- """
- Computes the presence updates a user should receive.
- First pulls presence updates from the database. Then consults PresenceRouter
- for whether any updates should be excluded by user ID.
- Args:
- user_id: The User ID of the user to compute presence updates for.
- include_offline: Whether to include offline presence states from the results.
- from_key: The minimum stream ID of updates to pull from the database
- before filtering.
- Returns:
- A list of presence states for the given user to receive.
- """
- updated_users = None
- if from_key:
- # Only return updates since the last sync
- result = self.store.presence_stream_cache.get_all_entities_changed(from_key)
- if result.hit:
- updated_users = result.entities
- if updated_users is not None:
- # Get the actual presence update for each change
- users_to_state = await self.get_presence_handler().current_state_for_users(
- updated_users
- )
- presence_updates = list(users_to_state.values())
- if not include_offline:
- # Filter out offline states
- presence_updates = self._filter_offline_presence_state(presence_updates)
- else:
- users_to_state = await self.store.get_presence_for_all_users(
- include_offline=include_offline
- )
- presence_updates = list(users_to_state.values())
- # TODO: This feels wildly inefficient, and it's unfortunate we need to ask the
- # module for information on a number of users when we then only take the info
- # for a single user
- # Filter through the presence router
- users_to_state_set = await self.get_presence_router().get_users_for_states(
- presence_updates
- )
- # We only want the mapping for the syncing user
- presence_updates = list(users_to_state_set[user_id])
- # Return presence information for all users
- return presence_updates
- def _filter_offline_presence_state(
- self, presence_updates: Iterable[UserPresenceState]
- ) -> List[UserPresenceState]:
- """Given an iterable containing user presence updates, return a list with any offline
- presence states removed.
- Args:
- presence_updates: Presence states to filter
- Returns:
- A new list with any offline presence states removed.
- """
- return [
- update
- for update in presence_updates
- if update.state != PresenceState.OFFLINE
- ]
- def get_current_key(self) -> int:
- return self.store.get_current_presence_token()
- def handle_timeouts(
- user_states: List[UserPresenceState],
- is_mine_fn: Callable[[str], bool],
- syncing_user_ids: Set[str],
- now: int,
- ) -> List[UserPresenceState]:
- """Checks the presence of users that have timed out and updates as
- appropriate.
- Args:
- user_states: List of UserPresenceState's to check.
- is_mine_fn: Function that returns if a user_id is ours
- syncing_user_ids: Set of user_ids with active syncs.
- now: Current time in ms.
- Returns:
- List of UserPresenceState updates
- """
- changes = {} # Actual changes we need to notify people about
- for state in user_states:
- is_mine = is_mine_fn(state.user_id)
- new_state = handle_timeout(state, is_mine, syncing_user_ids, now)
- if new_state:
- changes[state.user_id] = new_state
- return list(changes.values())
- def handle_timeout(
- state: UserPresenceState, is_mine: bool, syncing_user_ids: Set[str], now: int
- ) -> Optional[UserPresenceState]:
- """Checks the presence of the user to see if any of the timers have elapsed
- Args:
- state
- is_mine: Whether the user is ours
- syncing_user_ids: Set of user_ids with active syncs.
- now: Current time in ms.
- Returns:
- A UserPresenceState update or None if no update.
- """
- if state.state == PresenceState.OFFLINE:
- # No timeouts are associated with offline states.
- return None
- changed = False
- user_id = state.user_id
- if is_mine:
- if state.state == PresenceState.ONLINE:
- if now - state.last_active_ts > IDLE_TIMER:
- # Currently online, but last activity ages ago so auto
- # idle
- state = state.copy_and_replace(state=PresenceState.UNAVAILABLE)
- changed = True
- elif now - state.last_active_ts > LAST_ACTIVE_GRANULARITY:
- # So that we send down a notification that we've
- # stopped updating.
- changed = True
- if now - state.last_federation_update_ts > FEDERATION_PING_INTERVAL:
- # Need to send ping to other servers to ensure they don't
- # timeout and set us to offline
- changed = True
- # If there are have been no sync for a while (and none ongoing),
- # set presence to offline
- if user_id not in syncing_user_ids:
- # If the user has done something recently but hasn't synced,
- # don't set them as offline.
- sync_or_active = max(state.last_user_sync_ts, state.last_active_ts)
- if now - sync_or_active > SYNC_ONLINE_TIMEOUT:
- state = state.copy_and_replace(state=PresenceState.OFFLINE)
- changed = True
- else:
- # We expect to be poked occasionally by the other side.
- # This is to protect against forgetful/buggy servers, so that
- # no one gets stuck online forever.
- if now - state.last_federation_update_ts > FEDERATION_TIMEOUT:
- # The other side seems to have disappeared.
- state = state.copy_and_replace(state=PresenceState.OFFLINE)
- changed = True
- return state if changed else None
- def handle_update(
- prev_state: UserPresenceState,
- new_state: UserPresenceState,
- is_mine: bool,
- wheel_timer: WheelTimer,
- now: int,
- ) -> Tuple[UserPresenceState, bool, bool]:
- """Given a presence update:
- 1. Add any appropriate timers.
- 2. Check if we should notify anyone.
- Args:
- prev_state
- new_state
- is_mine: Whether the user is ours
- wheel_timer
- now: Time now in ms
- Returns:
- 3-tuple: `(new_state, persist_and_notify, federation_ping)` where:
- - new_state: is the state to actually persist
- - persist_and_notify: whether to persist and notify people
- - federation_ping: whether we should send a ping over federation
- """
- user_id = new_state.user_id
- persist_and_notify = False
- federation_ping = False
- # If the users are ours then we want to set up a bunch of timers
- # to time things out.
- if is_mine:
- if new_state.state == PresenceState.ONLINE:
- # Idle timer
- wheel_timer.insert(
- now=now, obj=user_id, then=new_state.last_active_ts + IDLE_TIMER
- )
- active = now - new_state.last_active_ts < LAST_ACTIVE_GRANULARITY
- new_state = new_state.copy_and_replace(currently_active=active)
- if active:
- wheel_timer.insert(
- now=now,
- obj=user_id,
- then=new_state.last_active_ts + LAST_ACTIVE_GRANULARITY,
- )
- if new_state.state != PresenceState.OFFLINE:
- # User has stopped syncing
- wheel_timer.insert(
- now=now,
- obj=user_id,
- then=new_state.last_user_sync_ts + SYNC_ONLINE_TIMEOUT,
- )
- last_federate = new_state.last_federation_update_ts
- if now - last_federate > FEDERATION_PING_INTERVAL:
- # Been a while since we've poked remote servers
- new_state = new_state.copy_and_replace(last_federation_update_ts=now)
- federation_ping = True
- else:
- wheel_timer.insert(
- now=now,
- obj=user_id,
- then=new_state.last_federation_update_ts + FEDERATION_TIMEOUT,
- )
- # Check whether the change was something worth notifying about
- if should_notify(prev_state, new_state):
- new_state = new_state.copy_and_replace(last_federation_update_ts=now)
- persist_and_notify = True
- return new_state, persist_and_notify, federation_ping
- async def get_interested_parties(
- store: DataStore, presence_router: PresenceRouter, states: List[UserPresenceState]
- ) -> Tuple[Dict[str, List[UserPresenceState]], Dict[str, List[UserPresenceState]]]:
- """Given a list of states return which entities (rooms, users)
- are interested in the given states.
- Args:
- store: The homeserver's data store.
- presence_router: A module for augmenting the destinations for presence updates.
- states: A list of incoming user presence updates.
- Returns:
- A 2-tuple of `(room_ids_to_states, users_to_states)`,
- with each item being a dict of `entity_name` -> `[UserPresenceState]`
- """
- room_ids_to_states: Dict[str, List[UserPresenceState]] = {}
- users_to_states: Dict[str, List[UserPresenceState]] = {}
- for state in states:
- room_ids = await store.get_rooms_for_user(state.user_id)
- for room_id in room_ids:
- room_ids_to_states.setdefault(room_id, []).append(state)
- # Always notify self
- users_to_states.setdefault(state.user_id, []).append(state)
- # Ask a presence routing module for any additional parties if one
- # is loaded.
- router_users_to_states = await presence_router.get_users_for_states(states)
- # Update the dictionaries with additional destinations and state to send
- for user_id, user_states in router_users_to_states.items():
- users_to_states.setdefault(user_id, []).extend(user_states)
- return room_ids_to_states, users_to_states
- async def get_interested_remotes(
- store: DataStore,
- presence_router: PresenceRouter,
- states: List[UserPresenceState],
- ) -> Dict[str, Set[UserPresenceState]]:
- """Given a list of presence states figure out which remote servers
- should be sent which.
- All the presence states should be for local users only.
- Args:
- store: The homeserver's data store.
- presence_router: A module for augmenting the destinations for presence updates.
- states: A list of incoming user presence updates.
- Returns:
- A map from destinations to presence states to send to that destination.
- """
- hosts_and_states: Dict[str, Set[UserPresenceState]] = {}
- # First we look up the rooms each user is in (as well as any explicit
- # subscriptions), then for each distinct room we look up the remote
- # hosts in those rooms.
- room_ids_to_states, users_to_states = await get_interested_parties(
- store, presence_router, states
- )
- for room_id, states in room_ids_to_states.items():
- hosts = await store.get_current_hosts_in_room(room_id)
- for host in hosts:
- hosts_and_states.setdefault(host, set()).update(states)
- for user_id, states in users_to_states.items():
- host = get_domain_from_id(user_id)
- hosts_and_states.setdefault(host, set()).update(states)
- return hosts_and_states
- class PresenceFederationQueue:
- """Handles sending ad hoc presence updates over federation, which are *not*
- due to state updates (that get handled via the presence stream), e.g.
- federation pings and sending existing present states to newly joined hosts.
- Only the last N minutes will be queued, so if a federation sender instance
- is down for longer then some updates will be dropped. This is OK as presence
- is ephemeral, and so it will self correct eventually.
- On workers the class tracks the last received position of the stream from
- replication, and handles querying for missed updates over HTTP replication,
- c.f. `get_current_token` and `get_replication_rows`.
- """
- # How long to keep entries in the queue for. Workers that are down for
- # longer than this duration will miss out on older updates.
- _KEEP_ITEMS_IN_QUEUE_FOR_MS = 5 * 60 * 1000
- # How often to check if we can expire entries from the queue.
- _CLEAR_ITEMS_EVERY_MS = 60 * 1000
- def __init__(self, hs: "HomeServer", presence_handler: BasePresenceHandler):
- self._clock = hs.get_clock()
- self._notifier = hs.get_notifier()
- self._instance_name = hs.get_instance_name()
- self._presence_handler = presence_handler
- self._repl_client = ReplicationGetStreamUpdates.make_client(hs)
- # Should we keep a queue of recent presence updates? We only bother if
- # another process may be handling federation sending.
- self._queue_presence_updates = True
- # Whether this instance is a presence writer.
- self._presence_writer = self._instance_name in hs.config.worker.writers.presence
- # The FederationSender instance, if this process sends federation traffic directly.
- self._federation = None
- if hs.should_send_federation():
- self._federation = hs.get_federation_sender()
- # We don't bother queuing up presence states if only this instance
- # is sending federation.
- if hs.config.worker.federation_shard_config.instances == [
- self._instance_name
- ]:
- self._queue_presence_updates = False
- # The queue of recently queued updates as tuples of: `(timestamp,
- # stream_id, destinations, user_ids)`. We don't store the full states
- # for efficiency, and remote workers will already have the full states
- # cached.
- self._queue: List[Tuple[int, int, Collection[str], Set[str]]] = []
- self._next_id = 1
- # Map from instance name to current token
- self._current_tokens: Dict[str, int] = {}
- if self._queue_presence_updates:
- self._clock.looping_call(self._clear_queue, self._CLEAR_ITEMS_EVERY_MS)
- def _clear_queue(self) -> None:
- """Clear out older entries from the queue."""
- clear_before = self._clock.time_msec() - self._KEEP_ITEMS_IN_QUEUE_FOR_MS
- # The queue is sorted by timestamp, so we can bisect to find the right
- # place to purge before. Note that we are searching using a 1-tuple with
- # the time, which does The Right Thing since the queue is a tuple where
- # the first item is a timestamp.
- index = bisect(self._queue, (clear_before,))
- self._queue = self._queue[index:]
- def send_presence_to_destinations(
- self, states: Collection[UserPresenceState], destinations: Collection[str]
- ) -> None:
- """Send the presence states to the given destinations.
- Will forward to the local federation sender (if there is one) and queue
- to send over replication (if there are other federation sender instances.).
- Must only be called on the presence writer process.
- """
- # This should only be called on a presence writer.
- assert self._presence_writer
- if self._federation:
- self._federation.send_presence_to_destinations(
- states=states,
- destinations=destinations,
- )
- if not self._queue_presence_updates:
- return
- now = self._clock.time_msec()
- stream_id = self._next_id
- self._next_id += 1
- self._queue.append((now, stream_id, destinations, {s.user_id for s in states}))
- self._notifier.notify_replication()
- def get_current_token(self, instance_name: str) -> int:
- """Get the current position of the stream.
- On workers this returns the last stream ID received from replication.
- """
- if instance_name == self._instance_name:
- return self._next_id - 1
- else:
- return self._current_tokens.get(instance_name, 0)
- async def get_replication_rows(
- self,
- instance_name: str,
- from_token: int,
- upto_token: int,
- target_row_count: int,
- ) -> Tuple[List[Tuple[int, Tuple[str, str]]], int, bool]:
- """Get all the updates between the two tokens.
- We return rows in the form of `(destination, user_id)` to keep the size
- of each row bounded (rather than returning the sets in a row).
- On workers this will query the presence writer process via HTTP replication.
- """
- if instance_name != self._instance_name:
- # If not local we query over http replication from the presence
- # writer
- result = await self._repl_client(
- instance_name=instance_name,
- stream_name=PresenceFederationStream.NAME,
- from_token=from_token,
- upto_token=upto_token,
- )
- return result["updates"], result["upto_token"], result["limited"]
- # If the from_token is the current token then there's nothing to return
- # and we can trivially no-op.
- if from_token == self._next_id - 1:
- return [], upto_token, False
- # We can find the correct position in the queue by noting that there is
- # exactly one entry per stream ID, and that the last entry has an ID of
- # `self._next_id - 1`, so we can count backwards from the end.
- #
- # Since we are returning all states in the range `from_token < stream_id
- # <= upto_token` we look for the index with a `stream_id` of `from_token
- # + 1`.
- #
- # Since the start of the queue is periodically truncated we need to
- # handle the case where `from_token` stream ID has already been dropped.
- start_idx = max(from_token + 1 - self._next_id, -len(self._queue))
- to_send: List[Tuple[int, Tuple[str, str]]] = []
- limited = False
- new_id = upto_token
- for _, stream_id, destinations, user_ids in self._queue[start_idx:]:
- if stream_id <= from_token:
- # Paranoia check that we are actually only sending states that
- # are have stream_id strictly greater than from_token. We should
- # never hit this.
- logger.warning(
- "Tried returning presence federation stream ID: %d less than from_token: %d (next_id: %d, len: %d)",
- stream_id,
- from_token,
- self._next_id,
- len(self._queue),
- )
- continue
- if stream_id > upto_token:
- break
- new_id = stream_id
- to_send.extend(
- (stream_id, (destination, user_id))
- for destination in destinations
- for user_id in user_ids
- )
- if len(to_send) > target_row_count:
- limited = True
- break
- return to_send, new_id, limited
- async def process_replication_rows(
- self, stream_name: str, instance_name: str, token: int, rows: list
- ) -> None:
- if stream_name != PresenceFederationStream.NAME:
- return
- # We keep track of the current tokens (so that we can catch up with anything we missed after a disconnect)
- self._current_tokens[instance_name] = token
- # If we're a federation sender we pull out the presence states to send
- # and forward them on.
- if not self._federation:
- return
- hosts_to_users: Dict[str, Set[str]] = {}
- for row in rows:
- hosts_to_users.setdefault(row.destination, set()).add(row.user_id)
- for host, user_ids in hosts_to_users.items():
- states = await self._presence_handler.current_state_for_users(user_ids)
- self._federation.send_presence_to_destinations(
- states=states.values(),
- destinations=[host],
- )
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