diff options
Diffstat (limited to 'synapse/handlers/message.py')
| -rw-r--r-- | synapse/handlers/message.py | 123 |
1 files changed, 122 insertions, 1 deletions
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py index 3b0156f516..4f53a5f5dc 100644 --- a/synapse/handlers/message.py +++ b/synapse/handlers/message.py @@ -15,6 +15,7 @@ # See the License for the specific language governing permissions and # limitations under the License. import logging +from typing import Optional from six import iteritems, itervalues, string_types @@ -22,9 +23,16 @@ from canonicaljson import encode_canonical_json, json from twisted.internet import defer from twisted.internet.defer import succeed +from twisted.internet.interfaces import IDelayedCall from synapse import event_auth -from synapse.api.constants import EventTypes, Membership, RelationTypes, UserTypes +from synapse.api.constants import ( + EventContentFields, + EventTypes, + Membership, + RelationTypes, + UserTypes, +) from synapse.api.errors import ( AuthError, Codes, @@ -62,6 +70,17 @@ class MessageHandler(object): self.storage = hs.get_storage() self.state_store = self.storage.state self._event_serializer = hs.get_event_client_serializer() + self._ephemeral_events_enabled = hs.config.enable_ephemeral_messages + self._is_worker_app = bool(hs.config.worker_app) + + # The scheduled call to self._expire_event. None if no call is currently + # scheduled. + self._scheduled_expiry = None # type: Optional[IDelayedCall] + + if not hs.config.worker_app: + run_as_background_process( + "_schedule_next_expiry", self._schedule_next_expiry + ) @defer.inlineCallbacks def get_room_data( @@ -225,6 +244,100 @@ class MessageHandler(object): for user_id, profile in iteritems(users_with_profile) } + def maybe_schedule_expiry(self, event): + """Schedule the expiry of an event if there's not already one scheduled, + or if the one running is for an event that will expire after the provided + timestamp. + + This function needs to invalidate the event cache, which is only possible on + the master process, and therefore needs to be run on there. + + Args: + event (EventBase): The event to schedule the expiry of. + """ + assert not self._is_worker_app + + expiry_ts = event.content.get(EventContentFields.SELF_DESTRUCT_AFTER) + if not isinstance(expiry_ts, int) or event.is_state(): + return + + # _schedule_expiry_for_event won't actually schedule anything if there's already + # a task scheduled for a timestamp that's sooner than the provided one. + self._schedule_expiry_for_event(event.event_id, expiry_ts) + + @defer.inlineCallbacks + def _schedule_next_expiry(self): + """Retrieve the ID and the expiry timestamp of the next event to be expired, + and schedule an expiry task for it. + + If there's no event left to expire, set _expiry_scheduled to None so that a + future call to save_expiry_ts can schedule a new expiry task. + """ + # Try to get the expiry timestamp of the next event to expire. + res = yield self.store.get_next_event_to_expire() + if res: + event_id, expiry_ts = res + self._schedule_expiry_for_event(event_id, expiry_ts) + + def _schedule_expiry_for_event(self, event_id, expiry_ts): + """Schedule an expiry task for the provided event if there's not already one + scheduled at a timestamp that's sooner than the provided one. + + Args: + event_id (str): The ID of the event to expire. + expiry_ts (int): The timestamp at which to expire the event. + """ + if self._scheduled_expiry: + # If the provided timestamp refers to a time before the scheduled time of the + # next expiry task, cancel that task and reschedule it for this timestamp. + next_scheduled_expiry_ts = self._scheduled_expiry.getTime() * 1000 + if expiry_ts < next_scheduled_expiry_ts: + self._scheduled_expiry.cancel() + else: + return + + # Figure out how many seconds we need to wait before expiring the event. + now_ms = self.clock.time_msec() + delay = (expiry_ts - now_ms) / 1000 + + # callLater doesn't support negative delays, so trim the delay to 0 if we're + # in that case. + if delay < 0: + delay = 0 + + logger.info("Scheduling expiry for event %s in %.3fs", event_id, delay) + + self._scheduled_expiry = self.clock.call_later( + delay, + run_as_background_process, + "_expire_event", + self._expire_event, + event_id, + ) + + @defer.inlineCallbacks + def _expire_event(self, event_id): + """Retrieve and expire an event that needs to be expired from the database. + + If the event doesn't exist in the database, log it and delete the expiry date + from the database (so that we don't try to expire it again). + """ + assert self._ephemeral_events_enabled + + self._scheduled_expiry = None + + logger.info("Expiring event %s", event_id) + + try: + # Expire the event if we know about it. This function also deletes the expiry + # date from the database in the same database transaction. + yield self.store.expire_event(event_id) + except Exception as e: + logger.error("Could not expire event %s: %r", event_id, e) + + # Schedule the expiry of the next event to expire. + yield self._schedule_next_expiry() + # The duration (in ms) after which rooms should be removed # `_rooms_to_exclude_from_dummy_event_insertion` (with the effect that we will try @@ -295,6 +408,10 @@ class EventCreationHandler(object): 5 * 60 * 1000, ) + self._message_handler = hs.get_message_handler() + + self._ephemeral_events_enabled = hs.config.enable_ephemeral_messages + @defer.inlineCallbacks def create_event( self, @@ -877,6 +994,10 @@ class EventCreationHandler(object): event, context=context ) + if self._ephemeral_events_enabled: + # If there's an expiry timestamp on the event, schedule its expiry. + self._message_handler.maybe_schedule_expiry(event) + yield self.pusher_pool.on_new_notifications(event_stream_id, max_stream_id) def _notify(): |