# See https://zulip.readthedocs.io/en/latest/subsystems/events-system.html for # high-level documentation on how this system works. import atexit import copy import logging import os import random import signal import sys import time import traceback from collections import deque from typing import ( AbstractSet, Any, Callable, Deque, Dict, Iterable, List, Mapping, MutableMapping, Optional, Sequence, Set, Union, cast, ) import orjson import tornado.ioloop from django.conf import settings from django.utils.translation import gettext as _ from typing_extensions import TypedDict from zerver.decorator import cachify from zerver.lib.message import MessageDict from zerver.lib.narrow import build_narrow_filter from zerver.lib.queue import queue_json_publish, retry_event from zerver.lib.request import JsonableError from zerver.lib.utils import statsd from zerver.middleware import async_request_timer_restart from zerver.models import UserProfile from zerver.tornado.autoreload import add_reload_hook from zerver.tornado.descriptors import clear_descriptor_by_handler_id, set_descriptor_by_handler_id from zerver.tornado.exceptions import BadEventQueueIdError from zerver.tornado.handlers import ( clear_handler_by_id, finish_handler, get_handler_by_id, handler_stats_string, ) # The idle timeout used to be a week, but we found that in that # situation, queues from dead browser sessions would grow quite large # due to the accumulation of message data in those queues. DEFAULT_EVENT_QUEUE_TIMEOUT_SECS = 60 * 10 # We garbage-collect every minute; this is totally fine given that the # GC scan takes ~2ms with 1000 event queues. EVENT_QUEUE_GC_FREQ_MSECS = 1000 * 60 * 1 # Capped limit for how long a client can request an event queue # to live MAX_QUEUE_TIMEOUT_SECS = 7 * 24 * 60 * 60 # The heartbeats effectively act as a server-side timeout for # get_events(). The actual timeout value is randomized for each # client connection based on the below value. We ensure that the # maximum timeout value is 55 seconds, to deal with crappy home # wireless routers that kill "inactive" http connections. HEARTBEAT_MIN_FREQ_SECS = 45 class ClientDescriptor: def __init__( self, user_profile_id: int, realm_id: int, event_queue: "EventQueue", event_types: Optional[Sequence[str]], client_type_name: str, apply_markdown: bool = True, client_gravatar: bool = True, slim_presence: bool = False, all_public_streams: bool = False, lifespan_secs: int = 0, narrow: Iterable[Sequence[str]] = [], bulk_message_deletion: bool = False, ) -> None: # These objects are serialized on shutdown and restored on restart. # If fields are added or semantics are changed, temporary code must be # added to load_event_queues() to update the restored objects. # Additionally, the to_dict and from_dict methods must be updated self.user_profile_id = user_profile_id self.realm_id = realm_id self.current_handler_id: Optional[int] = None self.current_client_name: Optional[str] = None self.event_queue = event_queue self.event_types = event_types self.last_connection_time = time.time() self.apply_markdown = apply_markdown self.client_gravatar = client_gravatar self.slim_presence = slim_presence self.all_public_streams = all_public_streams self.client_type_name = client_type_name self._timeout_handle: Any = None # TODO: should be return type of ioloop.call_later self.narrow = narrow self.narrow_filter = build_narrow_filter(narrow) self.bulk_message_deletion = bulk_message_deletion # Default for lifespan_secs is DEFAULT_EVENT_QUEUE_TIMEOUT_SECS; # but users can set it as high as MAX_QUEUE_TIMEOUT_SECS. if lifespan_secs == 0: lifespan_secs = DEFAULT_EVENT_QUEUE_TIMEOUT_SECS self.queue_timeout = min(lifespan_secs, MAX_QUEUE_TIMEOUT_SECS) def to_dict(self) -> Dict[str, Any]: # If you add a new key to this dict, make sure you add appropriate # migration code in from_dict or load_event_queues to account for # loading event queues that lack that key. return dict( user_profile_id=self.user_profile_id, realm_id=self.realm_id, event_queue=self.event_queue.to_dict(), queue_timeout=self.queue_timeout, event_types=self.event_types, last_connection_time=self.last_connection_time, apply_markdown=self.apply_markdown, client_gravatar=self.client_gravatar, slim_presence=self.slim_presence, all_public_streams=self.all_public_streams, narrow=self.narrow, client_type_name=self.client_type_name, bulk_message_deletion=self.bulk_message_deletion, ) def __repr__(self) -> str: return f"ClientDescriptor<{self.event_queue.id}>" @classmethod def from_dict(cls, d: MutableMapping[str, Any]) -> "ClientDescriptor": if "client_type" in d: # Temporary migration for the rename of client_type to client_type_name d["client_type_name"] = d["client_type"] if "client_gravatar" not in d: # Temporary migration for the addition of the client_gravatar field d["client_gravatar"] = False if "slim_presence" not in d: d["slim_presence"] = False ret = cls( d["user_profile_id"], d["realm_id"], EventQueue.from_dict(d["event_queue"]), d["event_types"], d["client_type_name"], d["apply_markdown"], d["client_gravatar"], d["slim_presence"], d["all_public_streams"], d["queue_timeout"], d.get("narrow", []), d.get("bulk_message_deletion", False), ) ret.last_connection_time = d["last_connection_time"] return ret def prepare_for_pickling(self) -> None: self.current_handler_id = None self._timeout_handle = None def add_event(self, event: Mapping[str, Any]) -> None: if self.current_handler_id is not None: handler = get_handler_by_id(self.current_handler_id) async_request_timer_restart(handler._request) self.event_queue.push(event) self.finish_current_handler() def finish_current_handler(self) -> bool: if self.current_handler_id is not None: err_msg = f"Got error finishing handler for queue {self.event_queue.id}" try: finish_handler( self.current_handler_id, self.event_queue.id, self.event_queue.contents(), self.apply_markdown, ) except Exception: logging.exception(err_msg, stack_info=True) finally: self.disconnect_handler() return True return False def accepts_event(self, event: Mapping[str, Any]) -> bool: if self.event_types is not None and event["type"] not in self.event_types: return False if event["type"] == "message": return self.narrow_filter(event) return True # TODO: Refactor so we don't need this function def accepts_messages(self) -> bool: return self.event_types is None or "message" in self.event_types def expired(self, now: float) -> bool: return ( self.current_handler_id is None and now - self.last_connection_time >= self.queue_timeout ) def connect_handler(self, handler_id: int, client_name: str) -> None: self.current_handler_id = handler_id self.current_client_name = client_name set_descriptor_by_handler_id(handler_id, self) self.last_connection_time = time.time() def timeout_callback() -> None: self._timeout_handle = None # All clients get heartbeat events self.add_event(dict(type="heartbeat")) ioloop = tornado.ioloop.IOLoop.instance() interval = HEARTBEAT_MIN_FREQ_SECS + random.randint(0, 10) if self.client_type_name != "API: heartbeat test": self._timeout_handle = ioloop.call_later(interval, timeout_callback) def disconnect_handler(self, client_closed: bool = False) -> None: if self.current_handler_id: clear_descriptor_by_handler_id(self.current_handler_id) clear_handler_by_id(self.current_handler_id) if client_closed: logging.info( "Client disconnected for queue %s (%s via %s)", self.event_queue.id, self.user_profile_id, self.current_client_name, ) self.current_handler_id = None self.current_client_name = None if self._timeout_handle is not None: ioloop = tornado.ioloop.IOLoop.instance() ioloop.remove_timeout(self._timeout_handle) self._timeout_handle = None def cleanup(self) -> None: # Before we can GC the event queue, we need to disconnect the # handler and notify the client (or connection server) so that # they can clean up their own state related to the GC'd event # queue. Finishing the handler before we GC ensures the # invariant that event queues are idle when passed to # `do_gc_event_queues` is preserved. self.finish_current_handler() do_gc_event_queues({self.event_queue.id}, {self.user_profile_id}, {self.realm_id}) def compute_full_event_type(event: Mapping[str, Any]) -> str: if event["type"] == "update_message_flags": if event["all"]: # Put the "all" case in its own category return "all_flags/{}/{}".format(event["flag"], event["operation"]) return "flags/{}/{}".format(event["operation"], event["flag"]) return event["type"] class EventQueue: def __init__(self, id: str) -> None: # When extending this list of properties, one must be sure to # update to_dict and from_dict. self.queue: Deque[Dict[str, Any]] = deque() self.next_event_id: int = 0 # will only be None for migration from old versions self.newest_pruned_id: Optional[int] = -1 self.id: str = id self.virtual_events: Dict[str, Dict[str, Any]] = {} def to_dict(self) -> Dict[str, Any]: # If you add a new key to this dict, make sure you add appropriate # migration code in from_dict or load_event_queues to account for # loading event queues that lack that key. d = dict( id=self.id, next_event_id=self.next_event_id, queue=list(self.queue), virtual_events=self.virtual_events, ) if self.newest_pruned_id is not None: d["newest_pruned_id"] = self.newest_pruned_id return d @classmethod def from_dict(cls, d: Dict[str, Any]) -> "EventQueue": ret = cls(d["id"]) ret.next_event_id = d["next_event_id"] ret.newest_pruned_id = d.get("newest_pruned_id", None) ret.queue = deque(d["queue"]) ret.virtual_events = d.get("virtual_events", {}) return ret def push(self, orig_event: Mapping[str, Any]) -> None: # By default, we make a shallow copy of the event dictionary # to push into the target event queue; this allows the calling # code to send the same "event" object to multiple queues. # This behavior is important because the event_queue system is # about to mutate the event dictionary, minimally to add the # event_id attribute. event = dict(orig_event) event["id"] = self.next_event_id self.next_event_id += 1 full_event_type = compute_full_event_type(event) if full_event_type == "restart" or full_event_type.startswith("flags/"): if full_event_type not in self.virtual_events: self.virtual_events[full_event_type] = copy.deepcopy(event) return # Update the virtual event with the values from the event virtual_event = self.virtual_events[full_event_type] virtual_event["id"] = event["id"] if "timestamp" in event: virtual_event["timestamp"] = event["timestamp"] if full_event_type == "restart": virtual_event["server_generation"] = event["server_generation"] elif full_event_type.startswith("flags/"): virtual_event["messages"] += event["messages"] else: self.queue.append(event) # Note that pop ignores virtual events. This is fine in our # current usage since virtual events should always be resolved to # a real event before being given to users. def pop(self) -> Dict[str, Any]: return self.queue.popleft() def empty(self) -> bool: return len(self.queue) == 0 and len(self.virtual_events) == 0 # See the comment on pop; that applies here as well def prune(self, through_id: int) -> None: while len(self.queue) != 0 and self.queue[0]["id"] <= through_id: self.newest_pruned_id = self.queue[0]["id"] self.pop() def contents(self, include_internal_data: bool = False) -> List[Dict[str, Any]]: contents: List[Dict[str, Any]] = [] virtual_id_map: Dict[str, Dict[str, Any]] = {} for event_type in self.virtual_events: virtual_id_map[self.virtual_events[event_type]["id"]] = self.virtual_events[event_type] virtual_ids = sorted(virtual_id_map.keys()) # Merge the virtual events into their final place in the queue index = 0 length = len(virtual_ids) for event in self.queue: while index < length and virtual_ids[index] < event["id"]: contents.append(virtual_id_map[virtual_ids[index]]) index += 1 contents.append(event) while index < length: contents.append(virtual_id_map[virtual_ids[index]]) index += 1 self.virtual_events = {} self.queue = deque(contents) if include_internal_data: return contents return prune_internal_data(contents) def prune_internal_data(events: List[Dict[str, Any]]) -> List[Dict[str, Any]]: """Prunes the internal_data data structures, which are not intended to be exposed to API clients. """ events = copy.deepcopy(events) for event in events: if event["type"] == "message" and "internal_data" in event: del event["internal_data"] return events # maps queue ids to client descriptors clients: Dict[str, ClientDescriptor] = {} # maps user id to list of client descriptors user_clients: Dict[int, List[ClientDescriptor]] = {} # maps realm id to list of client descriptors with all_public_streams=True realm_clients_all_streams: Dict[int, List[ClientDescriptor]] = {} # list of registered gc hooks. # each one will be called with a user profile id, queue, and bool # last_for_client that is true if this is the last queue pertaining # to this user_profile_id # that is about to be deleted gc_hooks: List[Callable[[int, ClientDescriptor, bool], None]] = [] next_queue_id = 0 def clear_client_event_queues_for_testing() -> None: assert settings.TEST_SUITE clients.clear() user_clients.clear() realm_clients_all_streams.clear() gc_hooks.clear() global next_queue_id next_queue_id = 0 def add_client_gc_hook(hook: Callable[[int, ClientDescriptor, bool], None]) -> None: gc_hooks.append(hook) def get_client_descriptor(queue_id: str) -> ClientDescriptor: try: return clients[queue_id] except KeyError: raise BadEventQueueIdError(queue_id) def get_client_descriptors_for_user(user_profile_id: int) -> List[ClientDescriptor]: return user_clients.get(user_profile_id, []) def get_client_descriptors_for_realm_all_streams(realm_id: int) -> List[ClientDescriptor]: return realm_clients_all_streams.get(realm_id, []) def add_to_client_dicts(client: ClientDescriptor) -> None: user_clients.setdefault(client.user_profile_id, []).append(client) if client.all_public_streams or client.narrow != []: realm_clients_all_streams.setdefault(client.realm_id, []).append(client) def allocate_client_descriptor(new_queue_data: MutableMapping[str, Any]) -> ClientDescriptor: global next_queue_id queue_id = str(settings.SERVER_GENERATION) + ":" + str(next_queue_id) next_queue_id += 1 new_queue_data["event_queue"] = EventQueue(queue_id).to_dict() client = ClientDescriptor.from_dict(new_queue_data) clients[queue_id] = client add_to_client_dicts(client) return client def do_gc_event_queues( to_remove: AbstractSet[str], affected_users: AbstractSet[int], affected_realms: AbstractSet[int] ) -> None: def filter_client_dict( client_dict: MutableMapping[int, List[ClientDescriptor]], key: int ) -> None: if key not in client_dict: return new_client_list = [c for c in client_dict[key] if c.event_queue.id not in to_remove] if len(new_client_list) == 0: del client_dict[key] else: client_dict[key] = new_client_list for user_id in affected_users: filter_client_dict(user_clients, user_id) for realm_id in affected_realms: filter_client_dict(realm_clients_all_streams, realm_id) for id in to_remove: for cb in gc_hooks: cb( clients[id].user_profile_id, clients[id], clients[id].user_profile_id not in user_clients, ) del clients[id] def gc_event_queues(port: int) -> None: start = time.time() to_remove: Set[str] = set() affected_users: Set[int] = set() affected_realms: Set[int] = set() for (id, client) in clients.items(): if client.expired(start): to_remove.add(id) affected_users.add(client.user_profile_id) affected_realms.add(client.realm_id) # We don't need to call e.g. finish_current_handler on the clients # being removed because they are guaranteed to be idle (because # they are expired) and thus not have a current handler. do_gc_event_queues(to_remove, affected_users, affected_realms) if settings.PRODUCTION: logging.info( "Tornado %d removed %d expired event queues owned by %d users in %.3fs." " Now %d active queues, %s", port, len(to_remove), len(affected_users), time.time() - start, len(clients), handler_stats_string(), ) statsd.gauge("tornado.active_queues", len(clients)) statsd.gauge("tornado.active_users", len(user_clients)) def persistent_queue_filename(port: int, last: bool = False) -> str: if settings.TORNADO_PROCESSES == 1: # Use non-port-aware, legacy version. if last: return settings.JSON_PERSISTENT_QUEUE_FILENAME_PATTERN % ("",) + ".last" return settings.JSON_PERSISTENT_QUEUE_FILENAME_PATTERN % ("",) if last: return settings.JSON_PERSISTENT_QUEUE_FILENAME_PATTERN % ("." + str(port) + ".last",) return settings.JSON_PERSISTENT_QUEUE_FILENAME_PATTERN % ("." + str(port),) def dump_event_queues(port: int) -> None: start = time.time() with open(persistent_queue_filename(port), "wb") as stored_queues: stored_queues.write( orjson.dumps([(qid, client.to_dict()) for (qid, client) in clients.items()]) ) if len(clients) > 0 or settings.PRODUCTION: logging.info( "Tornado %d dumped %d event queues in %.3fs", port, len(clients), time.time() - start ) def load_event_queues(port: int) -> None: global clients start = time.time() try: with open(persistent_queue_filename(port), "rb") as stored_queues: data = orjson.loads(stored_queues.read()) except FileNotFoundError: pass except orjson.JSONDecodeError: logging.exception("Tornado %d could not deserialize event queues", port, stack_info=True) else: try: clients = {qid: ClientDescriptor.from_dict(client) for (qid, client) in data} except Exception: logging.exception( "Tornado %d could not deserialize event queues", port, stack_info=True ) for client in clients.values(): # Put code for migrations due to event queue data format changes here add_to_client_dicts(client) if len(clients) > 0 or settings.PRODUCTION: logging.info( "Tornado %d loaded %d event queues in %.3fs", port, len(clients), time.time() - start ) def send_restart_events(immediate: bool = False) -> None: event: Dict[str, Any] = dict(type="restart", server_generation=settings.SERVER_GENERATION) if immediate: event["immediate"] = True for client in clients.values(): if client.accepts_event(event): client.add_event(event) def setup_event_queue(port: int) -> None: if not settings.TEST_SUITE: load_event_queues(port) atexit.register(dump_event_queues, port) # Make sure we dump event queues even if we exit via signal signal.signal(signal.SIGTERM, lambda signum, stack: sys.exit(1)) add_reload_hook(lambda: dump_event_queues(port)) try: os.rename(persistent_queue_filename(port), persistent_queue_filename(port, last=True)) except OSError: pass # Set up event queue garbage collection ioloop = tornado.ioloop.IOLoop.instance() pc = tornado.ioloop.PeriodicCallback( lambda: gc_event_queues(port), EVENT_QUEUE_GC_FREQ_MSECS, ioloop ) pc.start() send_restart_events(immediate=settings.DEVELOPMENT) def fetch_events(query: Mapping[str, Any]) -> Dict[str, Any]: queue_id: Optional[str] = query["queue_id"] dont_block: bool = query["dont_block"] last_event_id: Optional[int] = query["last_event_id"] user_profile_id: int = query["user_profile_id"] new_queue_data: Optional[MutableMapping[str, Any]] = query.get("new_queue_data") client_type_name: str = query["client_type_name"] handler_id: int = query["handler_id"] try: was_connected = False orig_queue_id = queue_id extra_log_data = "" if queue_id is None: if dont_block: assert new_queue_data is not None client = allocate_client_descriptor(new_queue_data) queue_id = client.event_queue.id else: raise JsonableError(_("Missing 'queue_id' argument")) else: if last_event_id is None: raise JsonableError(_("Missing 'last_event_id' argument")) client = get_client_descriptor(queue_id) if user_profile_id != client.user_profile_id: raise JsonableError(_("You are not authorized to get events from this queue")) if ( client.event_queue.newest_pruned_id is not None and last_event_id < client.event_queue.newest_pruned_id ): raise JsonableError( _("An event newer than {event_id} has already been pruned!").format( event_id=last_event_id, ) ) client.event_queue.prune(last_event_id) if ( client.event_queue.newest_pruned_id is not None and last_event_id != client.event_queue.newest_pruned_id ): raise JsonableError( _("Event {event_id} was not in this queue").format( event_id=last_event_id, ) ) was_connected = client.finish_current_handler() if not client.event_queue.empty() or dont_block: response: Dict[str, Any] = dict( events=client.event_queue.contents(), ) if orig_queue_id is None: response["queue_id"] = queue_id if len(response["events"]) == 1: extra_log_data = "[{}/{}/{}]".format( queue_id, len(response["events"]), response["events"][0]["type"] ) else: extra_log_data = "[{}/{}]".format(queue_id, len(response["events"])) if was_connected: extra_log_data += " [was connected]" return dict(type="response", response=response, extra_log_data=extra_log_data) # After this point, dont_block=False, the queue is empty, and we # have a pre-existing queue, so we wait for new events. if was_connected: logging.info( "Disconnected handler for queue %s (%s/%s)", queue_id, user_profile_id, client_type_name, ) except JsonableError as e: return dict(type="error", exception=e) client.connect_handler(handler_id, client_type_name) return dict(type="async") # Send email notifications to idle users # after they are idle for 1 hour NOTIFY_AFTER_IDLE_HOURS = 1 def build_offline_notification(user_profile_id: int, message_id: int) -> Dict[str, Any]: return { "user_profile_id": user_profile_id, "message_id": message_id, "type": "add", "timestamp": time.time(), } def missedmessage_hook( user_profile_id: int, client: ClientDescriptor, last_for_client: bool ) -> None: """The receiver_is_off_zulip logic used to determine whether a user has no active client suffers from a somewhat fundamental race condition. If the client is no longer on the Internet, receiver_is_off_zulip will still return False for DEFAULT_EVENT_QUEUE_TIMEOUT_SECS, until the queue is garbage-collected. This would cause us to reliably miss push/email notifying users for messages arriving during the DEFAULT_EVENT_QUEUE_TIMEOUT_SECS after they suspend their laptop (for example). We address this by, when the queue is garbage-collected at the end of those 10 minutes, checking to see if it's the last one, and if so, potentially triggering notifications to the user at that time, resulting in at most a DEFAULT_EVENT_QUEUE_TIMEOUT_SECS delay in the arrival of their notifications. As Zulip's APIs get more popular and the mobile apps start using long-lived event queues for perf optimization, future versions of this will likely need to replace checking `last_for_client` with something more complicated, so that we only consider clients like web browsers, not the mobile apps or random API scripts. """ # Only process missedmessage hook when the last queue for a # client has been garbage collected if not last_for_client: return for event in client.event_queue.contents(include_internal_data=True): if event["type"] != "message": continue assert "flags" in event flags = event["flags"] mentioned = "mentioned" in flags and "read" not in flags private_message = event["message"]["type"] == "private" # stream_push_notify is set in process_message_event. stream_push_notify = event.get("internal_data", {}).get("stream_push_notify", False) stream_email_notify = event.get("internal_data", {}).get("stream_email_notify", False) wildcard_mention_notify = ( event.get("internal_data", {}).get("wildcard_mention_notify", False) and "read" not in flags and "wildcard_mentioned" in flags ) stream_name = None if not private_message: stream_name = event["message"]["display_recipient"] # Since one is by definition idle, we don't need to check always_push_notify always_push_notify = False # Since we just GC'd the last event queue, the user is definitely idle. idle = True message_id = event["message"]["id"] # Pass on the information on whether a push or email notification was already sent. already_notified = dict( push_notified=event.get("internal_data", {}).get("push_notified", False), email_notified=event.get("internal_data", {}).get("email_notified", False), ) maybe_enqueue_notifications( user_profile_id, message_id, private_message, mentioned, wildcard_mention_notify, stream_push_notify, stream_email_notify, stream_name, always_push_notify, idle, already_notified, ) def receiver_is_off_zulip(user_profile_id: int) -> bool: # If a user has no message-receiving event queues, they've got no open zulip # session so we notify them. all_client_descriptors = get_client_descriptors_for_user(user_profile_id) message_event_queues = [ client for client in all_client_descriptors if client.accepts_messages() ] off_zulip = len(message_event_queues) == 0 return off_zulip def maybe_enqueue_notifications( user_profile_id: int, message_id: int, private_message: bool, mentioned: bool, wildcard_mention_notify: bool, stream_push_notify: bool, stream_email_notify: bool, stream_name: Optional[str], always_push_notify: bool, idle: bool, already_notified: Dict[str, bool], ) -> Dict[str, bool]: """This function has a complete unit test suite in `test_enqueue_notifications` that should be expanded as we add more features here. See https://zulip.readthedocs.io/en/latest/subsystems/notifications.html for high-level design documentation. """ notified: Dict[str, bool] = {} if (idle or always_push_notify) and ( private_message or mentioned or wildcard_mention_notify or stream_push_notify ): notice = build_offline_notification(user_profile_id, message_id) if private_message: notice["trigger"] = "private_message" elif mentioned: notice["trigger"] = "mentioned" elif wildcard_mention_notify: notice["trigger"] = "wildcard_mentioned" elif stream_push_notify: notice["trigger"] = "stream_push_notify" else: raise AssertionError("Unknown notification trigger!") notice["stream_name"] = stream_name if not already_notified.get("push_notified"): queue_json_publish("missedmessage_mobile_notifications", notice) notified["push_notified"] = True # Send missed_message emails if a private message or a # mention. Eventually, we'll add settings to allow email # notifications to match the model of push notifications # above. if idle and (private_message or mentioned or wildcard_mention_notify or stream_email_notify): notice = build_offline_notification(user_profile_id, message_id) if private_message: notice["trigger"] = "private_message" elif mentioned: notice["trigger"] = "mentioned" elif wildcard_mention_notify: notice["trigger"] = "wildcard_mentioned" elif stream_email_notify: notice["trigger"] = "stream_email_notify" else: raise AssertionError("Unknown notification trigger!") notice["stream_name"] = stream_name if not already_notified.get("email_notified"): queue_json_publish("missedmessage_emails", notice, lambda notice: None) notified["email_notified"] = True return notified class ClientInfo(TypedDict): client: ClientDescriptor flags: Iterable[str] is_sender: bool def get_client_info_for_message_event( event_template: Mapping[str, Any], users: Iterable[Mapping[str, Any]] ) -> Dict[str, ClientInfo]: """ Return client info for all the clients interested in a message. This basically includes clients for users who are recipients of the message, with some nuances for bots that auto-subscribe to all streams, plus users who may be mentioned, etc. """ send_to_clients: Dict[str, ClientInfo] = {} sender_queue_id: Optional[str] = event_template.get("sender_queue_id", None) def is_sender_client(client: ClientDescriptor) -> bool: return (sender_queue_id is not None) and client.event_queue.id == sender_queue_id # If we're on a public stream, look for clients (typically belonging to # bots) that are registered to get events for ALL streams. if "stream_name" in event_template and not event_template.get("invite_only"): realm_id = event_template["realm_id"] for client in get_client_descriptors_for_realm_all_streams(realm_id): send_to_clients[client.event_queue.id] = dict( client=client, flags=[], is_sender=is_sender_client(client), ) for user_data in users: user_profile_id: int = user_data["id"] flags: Iterable[str] = user_data.get("flags", []) for client in get_client_descriptors_for_user(user_profile_id): send_to_clients[client.event_queue.id] = dict( client=client, flags=flags, is_sender=is_sender_client(client), ) return send_to_clients def process_message_event( event_template: Mapping[str, Any], users: Iterable[Mapping[str, Any]] ) -> None: """See https://zulip.readthedocs.io/en/latest/subsystems/sending-messages.html for high-level documentation on this subsystem. """ send_to_clients = get_client_info_for_message_event(event_template, users) presence_idle_user_ids = set(event_template.get("presence_idle_user_ids", [])) wide_dict: Dict[str, Any] = event_template["message_dict"] # Temporary transitional code: Zulip servers that have message # events in their event queues and upgrade to the new version # that expects sender_delivery_email in these events will # throw errors processing events. We can remove this block # once we don't expect anyone to be directly upgrading from # 2.0.x to the latest Zulip. if "sender_delivery_email" not in wide_dict: # nocoverage wide_dict["sender_delivery_email"] = wide_dict["sender_email"] sender_id: int = wide_dict["sender_id"] message_id: int = wide_dict["id"] message_type: str = wide_dict["type"] sending_client: str = wide_dict["client"] @cachify def get_client_payload(apply_markdown: bool, client_gravatar: bool) -> Dict[str, Any]: return MessageDict.finalize_payload( wide_dict, apply_markdown=apply_markdown, client_gravatar=client_gravatar, ) # Extra user-specific data to include extra_user_data: Dict[int, Any] = {} for user_data in users: user_profile_id: int = user_data["id"] flags: Iterable[str] = user_data.get("flags", []) # If the recipient was offline and the message was a single or group PM to them # or they were @-notified potentially notify more immediately private_message = message_type == "private" and user_profile_id != sender_id mentioned = "mentioned" in flags and "read" not in flags stream_push_notify = user_data.get("stream_push_notify", False) stream_email_notify = user_data.get("stream_email_notify", False) wildcard_mention_notify = ( user_data.get("wildcard_mention_notify", False) and "wildcard_mentioned" in flags and "read" not in flags ) # We first check if a message is potentially mentionable, # since receiver_is_off_zulip is somewhat expensive. if ( private_message or mentioned or wildcard_mention_notify or stream_push_notify or stream_email_notify ): idle = receiver_is_off_zulip(user_profile_id) or ( user_profile_id in presence_idle_user_ids ) always_push_notify = user_data.get("always_push_notify", False) stream_name = event_template.get("stream_name") result: Dict[str, Any] = {} result["internal_data"] = maybe_enqueue_notifications( user_profile_id, message_id, private_message, mentioned, wildcard_mention_notify, stream_push_notify, stream_email_notify, stream_name, always_push_notify, idle, {}, ) result["internal_data"]["stream_push_notify"] = stream_push_notify result["internal_data"]["stream_email_notify"] = stream_email_notify result["internal_data"]["wildcard_mention_notify"] = wildcard_mention_notify extra_user_data[user_profile_id] = result for client_data in send_to_clients.values(): client = client_data["client"] flags = client_data["flags"] is_sender: bool = client_data.get("is_sender", False) extra_data: Optional[Mapping[str, bool]] = extra_user_data.get(client.user_profile_id, None) if not client.accepts_messages(): # The actual check is the accepts_event() check below; # this line is just an optimization to avoid copying # message data unnecessarily continue message_dict = get_client_payload(client.apply_markdown, client.client_gravatar) # Make sure Zephyr mirroring bots know whether stream is invite-only if "mirror" in client.client_type_name and event_template.get("invite_only"): message_dict = message_dict.copy() message_dict["invite_only_stream"] = True user_event: Dict[str, Any] = dict(type="message", message=message_dict, flags=flags) if extra_data is not None: user_event.update(extra_data) if is_sender: local_message_id = event_template.get("local_id", None) if local_message_id is not None: user_event["local_message_id"] = local_message_id if not client.accepts_event(user_event): continue # The below prevents (Zephyr) mirroring loops. if "mirror" in sending_client and sending_client.lower() == client.client_type_name.lower(): continue client.add_event(user_event) def process_presence_event(event: Mapping[str, Any], users: Iterable[int]) -> None: if "user_id" not in event: # We only recently added `user_id` to presence data. # Any old events in our queue can just be dropped, # since presence events are pretty ephemeral in nature. logging.warning("Dropping some obsolete presence events after upgrade.") slim_event = dict( type="presence", user_id=event["user_id"], server_timestamp=event["server_timestamp"], presence=event["presence"], ) legacy_event = dict( type="presence", user_id=event["user_id"], email=event["email"], server_timestamp=event["server_timestamp"], presence=event["presence"], ) for user_profile_id in users: for client in get_client_descriptors_for_user(user_profile_id): if client.accepts_event(event): if client.slim_presence: client.add_event(slim_event) else: client.add_event(legacy_event) def process_event(event: Mapping[str, Any], users: Iterable[int]) -> None: for user_profile_id in users: for client in get_client_descriptors_for_user(user_profile_id): if client.accepts_event(event): client.add_event(event) def process_deletion_event(event: Mapping[str, Any], users: Iterable[int]) -> None: for user_profile_id in users: for client in get_client_descriptors_for_user(user_profile_id): if not client.accepts_event(event): continue # For clients which support message deletion in bulk, we # send a list of msgs_ids together, otherwise we send a # delete event for each message. All clients will be # required to support bulk_message_deletion in the future; # this logic is intended for backwards-compatibility only. if client.bulk_message_deletion: client.add_event(event) continue for message_id in event["message_ids"]: # We use the following rather than event.copy() # because the read-only Mapping type doesn't support .copy(). compatibility_event = dict(event) compatibility_event["message_id"] = message_id del compatibility_event["message_ids"] client.add_event(compatibility_event) def process_message_update_event( orig_event: Mapping[str, Any], users: Iterable[Mapping[str, Any]] ) -> None: # Extract the parameters passed via the event object that don't # belong in the actual events. event_template = dict(orig_event) prior_mention_user_ids = set(event_template.pop("prior_mention_user_ids", [])) mention_user_ids = set(event_template.pop("mention_user_ids", [])) presence_idle_user_ids = set(event_template.pop("presence_idle_user_ids", [])) stream_push_user_ids = set(event_template.pop("stream_push_user_ids", [])) stream_email_user_ids = set(event_template.pop("stream_email_user_ids", [])) wildcard_mention_user_ids = set(event_template.pop("wildcard_mention_user_ids", [])) push_notify_user_ids = set(event_template.pop("push_notify_user_ids", [])) stream_name = event_template.get("stream_name") message_id = event_template["message_id"] for user_data in users: user_profile_id = user_data["id"] user_event = dict(event_template) # shallow copy, but deep enough for our needs for key in user_data.keys(): if key != "id": user_event[key] = user_data[key] wildcard_mentioned = "wildcard_mentioned" in user_event["flags"] wildcard_mention_notify = wildcard_mentioned and ( user_profile_id in wildcard_mention_user_ids ) maybe_enqueue_notifications_for_message_update( user_profile_id=user_profile_id, message_id=message_id, stream_name=stream_name, prior_mention_user_ids=prior_mention_user_ids, mention_user_ids=mention_user_ids, wildcard_mention_notify=wildcard_mention_notify, presence_idle_user_ids=presence_idle_user_ids, stream_push_user_ids=stream_push_user_ids, stream_email_user_ids=stream_email_user_ids, push_notify_user_ids=push_notify_user_ids, ) for client in get_client_descriptors_for_user(user_profile_id): if client.accepts_event(user_event): # We need to do another shallow copy, or we risk # sending the same event to multiple clients. client.add_event(user_event) def maybe_enqueue_notifications_for_message_update( user_profile_id: UserProfile, message_id: int, stream_name: Optional[str], prior_mention_user_ids: Set[int], mention_user_ids: Set[int], wildcard_mention_notify: bool, presence_idle_user_ids: Set[int], stream_push_user_ids: Set[int], stream_email_user_ids: Set[int], push_notify_user_ids: Set[int], ) -> None: private_message = stream_name is None if private_message: # We don't do offline notifications for PMs, because # we already notified the user of the original message return if user_profile_id in prior_mention_user_ids: # Don't spam people with duplicate mentions. This is # especially important considering that most message # edits are simple typo corrections. # # Note that prior_mention_user_ids contains users who received # a wildcard mention as well as normal mentions. # # TODO: Ideally, that would mean that we exclude here cases # where user_profile.wildcard_mentions_notify=False and have # those still send a notification. However, we don't have the # data to determine whether or not that was the case at the # time the original message was sent, so we can't do that # without extending the UserMessage data model. return stream_push_notify = user_profile_id in stream_push_user_ids stream_email_notify = user_profile_id in stream_email_user_ids if stream_push_notify or stream_email_notify: # Currently we assume that if this flag is set to True, then # the user already was notified about the earlier message, # so we short circuit. We may handle this more rigorously # in the future by looking at something like an AlreadyNotified # model. return # We can have newly mentioned people in an updated message. mentioned = user_profile_id in mention_user_ids always_push_notify = user_profile_id in push_notify_user_ids idle = (user_profile_id in presence_idle_user_ids) or receiver_is_off_zulip(user_profile_id) maybe_enqueue_notifications( user_profile_id=user_profile_id, message_id=message_id, private_message=private_message, mentioned=mentioned, wildcard_mention_notify=wildcard_mention_notify, stream_push_notify=stream_push_notify, stream_email_notify=stream_email_notify, stream_name=stream_name, always_push_notify=always_push_notify, idle=idle, already_notified={}, ) def process_notification(notice: Mapping[str, Any]) -> None: event: Mapping[str, Any] = notice["event"] users: Union[List[int], List[Mapping[str, Any]]] = notice["users"] start_time = time.time() if event["type"] == "message": process_message_event(event, cast(Iterable[Mapping[str, Any]], users)) elif event["type"] == "update_message": process_message_update_event(event, cast(Iterable[Mapping[str, Any]], users)) elif event["type"] == "delete_message": if len(users) > 0 and isinstance(users[0], dict): # do_delete_messages used to send events with users in # dict format {"id": } This block is here for # compatibility with events in that format still in the # queue at the time of upgrade. # # TODO/compatibility: Remove this block once you can no # longer directly upgrade directly from 4.x to master. user_ids: List[int] = [user["id"] for user in cast(List[Mapping[str, int]], users)] else: user_ids = cast(List[int], users) process_deletion_event(event, user_ids) elif event["type"] == "presence": process_presence_event(event, cast(Iterable[int], users)) else: process_event(event, cast(Iterable[int], users)) logging.debug( "Tornado: Event %s for %s users took %sms", event["type"], len(users), int(1000 * (time.time() - start_time)), ) def get_wrapped_process_notification(queue_name: str) -> Callable[[List[Dict[str, Any]]], None]: def failure_processor(notice: Dict[str, Any]) -> None: logging.error( "Maximum retries exceeded for Tornado notice:%s\nStack trace:\n%s\n", notice, traceback.format_exc(), ) def wrapped_process_notification(notices: List[Dict[str, Any]]) -> None: for notice in notices: try: process_notification(notice) except Exception: retry_event(queue_name, notice, failure_processor) return wrapped_process_notification