diff options
Diffstat (limited to 'synapse/handlers/presence.py')
| -rw-r--r-- | synapse/handlers/presence.py | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py index 251b48148d..e120dd1f48 100644 --- a/synapse/handlers/presence.py +++ b/synapse/handlers/presence.py @@ -22,6 +22,7 @@ The methods that define policy are: - should_notify """ import abc +import contextlib import logging from contextlib import contextmanager from typing import ( @@ -48,6 +49,11 @@ from synapse.logging.context import run_in_background from synapse.logging.utils import log_function 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.tcp.commands import ClearUserSyncsCommand from synapse.state import StateHandler from synapse.storage.databases.main import DataStore from synapse.types import Collection, JsonDict, UserID, get_domain_from_id @@ -104,6 +110,10 @@ FEDERATION_PING_INTERVAL = 25 * 60 * 1000 # 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 @@ -208,6 +218,242 @@ class BasePresenceHandler(abc.ABC): with the app. """ + 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. + + This is a no-op when presence is handled by a different worker. + + 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 + """ + pass + + 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. + + This is a no-op when presence is handled by a different worker. + """ + pass + + async def process_replication_rows(self, token, rows): + """Process presence stream rows received over replication.""" + pass + + +class _NullContextManager(ContextManager[None]): + """A context manager which does nothing.""" + + def __exit__(self, exc_type, exc_val, exc_tb): + pass + + +class WorkerPresenceHandler(BasePresenceHandler): + def __init__(self, hs): + super().__init__(hs) + self.hs = hs + self.is_mine_id = hs.is_mine_id + + self.presence_router = hs.get_presence_router() + self._presence_enabled = hs.config.use_presence + + # The number of ongoing syncs on this process, by user id. + # Empty if _presence_enabled is false. + self._user_to_num_current_syncs = {} # type: 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 master of that yet + self.users_going_offline = {} + + 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, + ) + + def _on_shutdown(self): + if self._presence_enabled: + self.hs.get_tcp_replication().send_command( + ClearUserSyncsCommand(self.instance_id) + ) + + def send_user_sync(self, user_id, is_syncing, last_sync_ms): + if self._presence_enabled: + self.hs.get_tcp_replication().send_user_sync( + self.instance_id, user_id, is_syncing, last_sync_ms + ) + + def mark_as_coming_online(self, user_id): + """A user has started syncing. Send a UserSync to the master, unless they + had recently stopped syncing. + + Args: + user_id (str) + """ + going_offline = self.users_going_offline.pop(user_id, None) + if not going_offline: + # Safe to skip because we haven't yet told the master they were offline + self.send_user_sync(user_id, True, self.clock.time_msec()) + + def mark_as_going_offline(self, user_id): + """A user has stopped syncing. We wait before notifying the master 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 master + + Args: + user_id (str) + """ + self.users_going_offline[user_id] = self.clock.time_msec() + + def send_stop_syncing(self): + """Check if there are any users who have stopped syncing a while ago + and haven't come back yet. If there are poke the master 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 + ) -> 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() + + 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(): + # 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(): + try: + yield + finally: + _end() + + return _user_syncing() + + async def notify_from_replication(self, states, stream_id): + parties = await get_interested_parties(self.store, self.presence_router, 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=users_to_states.keys(), + ) + + async def process_replication_rows(self, token, rows): + 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 + ] + + for state in states: + self.user_to_current_state[state.user_id] = state + + stream_id = token + await self.notify_from_replication(states, stream_id) + + 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, state, ignore_status_msg=False): + """Set the presence state of the user.""" + 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.use_presence: + return + + # Proxy request to master + await self._set_state_client( + user_id=user_id, state=state, ignore_status_msg=ignore_status_msg + ) + + async def bump_presence_active_time(self, user): + """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.use_presence: + return + + # Proxy request to master + user_id = user.to_string() + await self._bump_active_client(user_id=user_id) + class PresenceHandler(BasePresenceHandler): def __init__(self, hs: "HomeServer"): |