diff options
| -rw-r--r-- | changelog.d/9885.misc | 1 | ||||
| -rw-r--r-- | changelog.d/9886.misc | 1 | ||||
| -rw-r--r-- | synapse/handlers/presence.py | 159 | ||||
| -rw-r--r-- | synapse/util/caches/lrucache.py | 77 |
4 files changed, 150 insertions, 88 deletions
diff --git a/changelog.d/9885.misc b/changelog.d/9885.misc new file mode 100644 index 0000000000..492fccea46 --- /dev/null +++ b/changelog.d/9885.misc @@ -0,0 +1 @@ +Add type hints to presence handler. diff --git a/changelog.d/9886.misc b/changelog.d/9886.misc new file mode 100644 index 0000000000..8ff869e659 --- /dev/null +++ b/changelog.d/9886.misc @@ -0,0 +1 @@ +Reduce memory usage of the LRU caches. diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py index 969c73c1e7..e9f618bb5a 100644 --- a/synapse/handlers/presence.py +++ b/synapse/handlers/presence.py @@ -28,6 +28,7 @@ from bisect import bisect from contextlib import contextmanager from typing import ( TYPE_CHECKING, + Callable, Collection, Dict, FrozenSet, @@ -232,23 +233,23 @@ class BasePresenceHandler(abc.ABC): """ async def update_external_syncs_row( - self, process_id, user_id, is_syncing, sync_time_msec - ): + 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 (str): An identifier for the process the users are + 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 (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 + 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 """ pass - async def update_external_syncs_clear(self, process_id): + 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. @@ -304,7 +305,7 @@ class _NullContextManager(ContextManager[None]): class WorkerPresenceHandler(BasePresenceHandler): - def __init__(self, hs): + def __init__(self, hs: "HomeServer"): super().__init__(hs) self.hs = hs @@ -327,7 +328,7 @@ class WorkerPresenceHandler(BasePresenceHandler): # 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 = {} + self.users_going_offline = {} # type: Dict[str, int] self._bump_active_client = ReplicationBumpPresenceActiveTime.make_client(hs) self._set_state_client = ReplicationPresenceSetState.make_client(hs) @@ -346,24 +347,21 @@ class WorkerPresenceHandler(BasePresenceHandler): self._on_shutdown, ) - def _on_shutdown(self): + def _on_shutdown(self) -> None: 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): + def send_user_sync(self, user_id: str, is_syncing: bool, last_sync_ms: int) -> None: 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): + 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. - - Args: - user_id (str) """ going_offline = self.users_going_offline.pop(user_id, None) if not going_offline: @@ -371,18 +369,15 @@ class WorkerPresenceHandler(BasePresenceHandler): # were offline self.send_user_sync(user_id, True, self.clock.time_msec()) - def mark_as_going_offline(self, user_id): + 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 - - Args: - user_id (str) """ self.users_going_offline[user_id] = self.clock.time_msec() - def send_stop_syncing(self): + 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. """ @@ -430,7 +425,9 @@ class WorkerPresenceHandler(BasePresenceHandler): return _user_syncing() - async def notify_from_replication(self, states, stream_id): + 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 @@ -478,7 +475,12 @@ class WorkerPresenceHandler(BasePresenceHandler): if count > 0 ] - async def set_state(self, target_user, state, ignore_status_msg=False): + async def set_state( + self, + target_user: UserID, + state: JsonDict, + ignore_status_msg: bool = False, + ) -> None: """Set the presence state of the user.""" presence = state["presence"] @@ -508,7 +510,7 @@ class WorkerPresenceHandler(BasePresenceHandler): ignore_status_msg=ignore_status_msg, ) - async def bump_presence_active_time(self, user): + 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. """ @@ -592,8 +594,8 @@ class PresenceHandler(BasePresenceHandler): # 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 = {} # type: Dict[int, Set[str]] - self.external_process_last_updated_ms = {} # type: Dict[int, int] + self.external_process_to_current_syncs = {} # type: Dict[str, Set[str]] + self.external_process_last_updated_ms = {} # type: Dict[str, int] self.external_sync_linearizer = Linearizer(name="external_sync_linearizer") @@ -633,7 +635,7 @@ class PresenceHandler(BasePresenceHandler): self._event_pos = self.store.get_current_events_token() self._event_processing = False - async def _on_shutdown(self): + 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 @@ -662,7 +664,7 @@ class PresenceHandler(BasePresenceHandler): ) logger.info("Finished _on_shutdown") - async def _persist_unpersisted_changes(self): + async def _persist_unpersisted_changes(self) -> None: """We periodically persist the unpersisted changes, as otherwise they may stack up and slow down shutdown times. """ @@ -762,7 +764,7 @@ class PresenceHandler(BasePresenceHandler): states, destinations ) - async def _handle_timeouts(self): + async def _handle_timeouts(self) -> None: """Checks the presence of users that have timed out and updates as appropriate. """ @@ -814,7 +816,7 @@ class PresenceHandler(BasePresenceHandler): return await self._update_states(changes) - async def bump_presence_active_time(self, user): + 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. """ @@ -911,17 +913,17 @@ class PresenceHandler(BasePresenceHandler): return [] async def update_external_syncs_row( - self, process_id, user_id, is_syncing, sync_time_msec - ): + 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 (str): An identifier for the process the users are + 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 (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 + 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 """ with (await self.external_sync_linearizer.queue(process_id)): prev_state = await self.current_state_for_user(user_id) @@ -958,7 +960,7 @@ class PresenceHandler(BasePresenceHandler): self.external_process_last_updated_ms[process_id] = self.clock.time_msec() - async def update_external_syncs_clear(self, process_id): + 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. @@ -979,12 +981,12 @@ class PresenceHandler(BasePresenceHandler): ) self.external_process_last_updated_ms.pop(process_id, None) - async def current_state_for_user(self, user_id): + 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] - async def _persist_and_notify(self, states): + async def _persist_and_notify(self, states: List[UserPresenceState]) -> None: """Persist states in the database, poke the notifier and send to interested remote servers """ @@ -1005,7 +1007,7 @@ class PresenceHandler(BasePresenceHandler): # stream (which is updated by `store.update_presence`). await self.maybe_send_presence_to_interested_destinations(states) - async def incoming_presence(self, origin, content): + 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 @@ -1055,7 +1057,9 @@ class PresenceHandler(BasePresenceHandler): federation_presence_counter.inc(len(updates)) await self._update_states(updates) - async def set_state(self, target_user, state, ignore_status_msg=False): + async def set_state( + self, target_user: UserID, state: JsonDict, ignore_status_msg: bool = False + ) -> None: """Set the presence state of the user.""" status_msg = state.get("status_msg", None) presence = state["presence"] @@ -1089,7 +1093,7 @@ class PresenceHandler(BasePresenceHandler): await self._update_states([prev_state.copy_and_replace(**new_fields)]) - async def is_visible(self, observed_user, observer_user): + 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() @@ -1144,7 +1148,7 @@ class PresenceHandler(BasePresenceHandler): ) return rows - def notify_new_event(self): + def notify_new_event(self) -> None: """Called when new events have happened. Handles users and servers joining rooms and require being sent presence. """ @@ -1163,7 +1167,7 @@ class PresenceHandler(BasePresenceHandler): run_as_background_process("presence.notify_new_event", _process_presence) - async def _unsafe_process(self): + async def _unsafe_process(self) -> None: # Loop round handling deltas until we're up to date while True: with Measure(self.clock, "presence_delta"): @@ -1188,7 +1192,7 @@ class PresenceHandler(BasePresenceHandler): max_pos ) - async def _handle_state_delta(self, deltas): + async def _handle_state_delta(self, deltas: List[JsonDict]) -> None: """Process current state deltas to find new joins that need to be handled. """ @@ -1311,7 +1315,7 @@ class PresenceHandler(BasePresenceHandler): return [remote_host], states -def should_notify(old_state, new_state): +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 @@ -1347,7 +1351,9 @@ def should_notify(old_state, new_state): return False -def format_user_presence_state(state, now, include_user_id=True): +def format_user_presence_state( + state: UserPresenceState, now: int, include_user_id: bool = True +) -> JsonDict: """Convert UserPresenceState to a format that can be sent down to clients and to other servers. @@ -1385,11 +1391,11 @@ class PresenceEventSource: @log_function async def get_new_events( self, - user, - from_key, - room_ids=None, - include_offline=True, - explicit_room_id=None, + user: UserID, + from_key: Optional[int], + room_ids: Optional[List[str]] = None, + include_offline: bool = True, + explicit_room_id: Optional[str] = None, **kwargs, ) -> Tuple[List[UserPresenceState], int]: # The process for getting presence events are: @@ -1594,7 +1600,7 @@ class PresenceEventSource: if update.state != PresenceState.OFFLINE ] - def get_current_key(self): + def get_current_key(self) -> int: return self.store.get_current_presence_token() @cached(num_args=2, cache_context=True) @@ -1654,15 +1660,20 @@ class PresenceEventSource: return users_interested_in -def handle_timeouts(user_states, is_mine_fn, syncing_user_ids, now): +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): List of UserPresenceState's to check. - is_mine_fn (fn): Function that returns if a user_id is ours - syncing_user_ids (set): Set of user_ids with active syncs. - now (int): Current time in ms. + 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 @@ -1679,14 +1690,16 @@ def handle_timeouts(user_states, is_mine_fn, syncing_user_ids, now): return list(changes.values()) -def handle_timeout(state, is_mine, syncing_user_ids, now): +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 (UserPresenceState) - is_mine (bool): Whether the user is ours - syncing_user_ids (set): Set of user_ids with active syncs. - now (int): Current time in ms. + 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. @@ -1738,23 +1751,29 @@ def handle_timeout(state, is_mine, syncing_user_ids, now): return state if changed else None -def handle_update(prev_state, new_state, is_mine, wheel_timer, now): +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 (UserPresenceState) - new_state (UserPresenceState) - is_mine (bool): Whether the user is ours - wheel_timer (WheelTimer) - now (int): Time now in ms + 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 (bool): whether to persist and notify people - - federation_ping (bool): whether we should send a ping over federation + - 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 diff --git a/synapse/util/caches/lrucache.py b/synapse/util/caches/lrucache.py index a21d34fcb4..10b0ec6b75 100644 --- a/synapse/util/caches/lrucache.py +++ b/synapse/util/caches/lrucache.py @@ -17,8 +17,10 @@ from functools import wraps from typing import ( Any, Callable, + Collection, Generic, Iterable, + List, Optional, Type, TypeVar, @@ -57,13 +59,56 @@ class _Node: __slots__ = ["prev_node", "next_node", "key", "value", "callbacks"] def __init__( - self, prev_node, next_node, key, value, callbacks: Optional[set] = None + self, + prev_node, + next_node, + key, + value, + callbacks: Collection[Callable[[], None]] = (), ): self.prev_node = prev_node self.next_node = next_node self.key = key self.value = value - self.callbacks = callbacks or set() + + # Set of callbacks to run when the node gets deleted. We store as a list + # rather than a set to keep memory usage down (and since we expect few + # entries per node, the performance of checking for duplication in a + # list vs using a set is negligible). + # + # Note that we store this as an optional list to keep the memory + # footprint down. Storing `None` is free as its a singleton, while empty + # lists are 56 bytes (and empty sets are 216 bytes, if we did the naive + # thing and used sets). + self.callbacks = None # type: Optional[List[Callable[[], None]]] + + self.add_callbacks(callbacks) + + def add_callbacks(self, callbacks: Collection[Callable[[], None]]) -> None: + """Add to stored list of callbacks, removing duplicates.""" + + if not callbacks: + return + + if not self.callbacks: + self.callbacks = [] + + for callback in callbacks: + if callback not in self.callbacks: + self.callbacks.append(callback) + + def run_and_clear_callbacks(self) -> None: + """Run all callbacks and clear the stored list of callbacks. Used when + the node is being deleted. + """ + + if not self.callbacks: + return + + for callback in self.callbacks: + callback() + + self.callbacks = None class LruCache(Generic[KT, VT]): @@ -177,10 +222,10 @@ class LruCache(Generic[KT, VT]): self.len = synchronized(cache_len) - def add_node(key, value, callbacks: Optional[set] = None): + def add_node(key, value, callbacks: Collection[Callable[[], None]] = ()): prev_node = list_root next_node = prev_node.next_node - node = _Node(prev_node, next_node, key, value, callbacks or set()) + node = _Node(prev_node, next_node, key, value, callbacks) prev_node.next_node = node next_node.prev_node = node cache[key] = node @@ -211,16 +256,15 @@ class LruCache(Generic[KT, VT]): deleted_len = size_callback(node.value) cached_cache_len[0] -= deleted_len - for cb in node.callbacks: - cb() - node.callbacks.clear() + node.run_and_clear_callbacks() + return deleted_len @overload def cache_get( key: KT, default: Literal[None] = None, - callbacks: Iterable[Callable[[], None]] = ..., + callbacks: Collection[Callable[[], None]] = ..., update_metrics: bool = ..., ) -> Optional[VT]: ... @@ -229,7 +273,7 @@ class LruCache(Generic[KT, VT]): def cache_get( key: KT, default: T, - callbacks: Iterable[Callable[[], None]] = ..., + callbacks: Collection[Callable[[], None]] = ..., update_metrics: bool = ..., ) -> Union[T, VT]: ... @@ -238,13 +282,13 @@ class LruCache(Generic[KT, VT]): def cache_get( key: KT, default: Optional[T] = None, - callbacks: Iterable[Callable[[], None]] = (), + callbacks: Collection[Callable[[], None]] = (), update_metrics: bool = True, ): node = cache.get(key, None) if node is not None: move_node_to_front(node) - node.callbacks.update(callbacks) + node.add_callbacks(callbacks) if update_metrics and metrics: metrics.inc_hits() return node.value @@ -260,10 +304,8 @@ class LruCache(Generic[KT, VT]): # We sometimes store large objects, e.g. dicts, which cause # the inequality check to take a long time. So let's only do # the check if we have some callbacks to call. - if node.callbacks and value != node.value: - for cb in node.callbacks: - cb() - node.callbacks.clear() + if value != node.value: + node.run_and_clear_callbacks() # We don't bother to protect this by value != node.value as # generally size_callback will be cheap compared with equality @@ -273,7 +315,7 @@ class LruCache(Generic[KT, VT]): cached_cache_len[0] -= size_callback(node.value) cached_cache_len[0] += size_callback(value) - node.callbacks.update(callbacks) + node.add_callbacks(callbacks) move_node_to_front(node) node.value = value @@ -326,8 +368,7 @@ class LruCache(Generic[KT, VT]): list_root.next_node = list_root list_root.prev_node = list_root for node in cache.values(): - for cb in node.callbacks: - cb() + node.run_and_clear_callbacks() cache.clear() if size_callback: cached_cache_len[0] = 0 |