252 lines
9.1 KiB
Python
252 lines
9.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer, reactor
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import logging
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from synapse.util.metrics import Measure
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from synapse.util.logcontext import LoggingContext
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from mailer import Mailer
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logger = logging.getLogger(__name__)
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# The amount of time we always wait before ever emailing about a notification
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# (to give the user a chance to respond to other push or notice the window)
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DELAY_BEFORE_MAIL_MS = 2 * 60 * 1000
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THROTTLE_START_MS = 2 * 60 * 1000
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THROTTLE_MAX_MS = (2 * 60 * 1000) * (2 ** 11) # ~3 days
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THROTTLE_MULTIPLIER = 2
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# If no event triggers a notification for this long after the previous,
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# the throttle is released.
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THROTTLE_RESET_AFTER_MS = (2 * 60 * 1000) * (2 ** 11) # ~3 days
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class EmailPusher(object):
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"""
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A pusher that sends email notifications about events (approximately)
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when they happen.
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This shares quite a bit of code with httpusher: it would be good to
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factor out the common parts
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"""
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def __init__(self, hs, pusherdict):
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self.hs = hs
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self.store = self.hs.get_datastore()
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self.clock = self.hs.get_clock()
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self.pusher_id = pusherdict['id']
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self.user_id = pusherdict['user_name']
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self.app_id = pusherdict['app_id']
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self.email = pusherdict['pushkey']
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self.last_stream_ordering = pusherdict['last_stream_ordering']
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self.timed_call = None
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self.throttle_params = None
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# See httppusher
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self.max_stream_ordering = None
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self.processing = False
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if self.hs.config.email_enable_notifs:
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self.mailer = Mailer(self.hs)
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else:
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self.mailer = None
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@defer.inlineCallbacks
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def on_started(self):
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if self.mailer is not None:
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self.throttle_params = yield self.store.get_throttle_params_by_room(
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self.pusher_id
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)
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yield self._process()
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def on_stop(self):
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if self.timed_call:
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self.timed_call.cancel()
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@defer.inlineCallbacks
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def on_new_notifications(self, min_stream_ordering, max_stream_ordering):
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self.max_stream_ordering = max(max_stream_ordering, self.max_stream_ordering)
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yield self._process()
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def on_new_receipts(self, min_stream_id, max_stream_id):
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# We could wake up and cancel the timer but there tend to be quite a
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# lot of read receipts so it's probably less work to just let the
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# timer fire
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return defer.succeed(None)
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@defer.inlineCallbacks
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def on_timer(self):
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self.timed_call = None
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yield self._process()
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@defer.inlineCallbacks
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def _process(self):
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if self.processing:
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return
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with LoggingContext("emailpush._process"):
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with Measure(self.clock, "emailpush._process"):
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try:
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self.processing = True
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# if the max ordering changes while we're running _unsafe_process,
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# call it again, and so on until we've caught up.
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while True:
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starting_max_ordering = self.max_stream_ordering
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try:
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yield self._unsafe_process()
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except:
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logger.exception("Exception processing notifs")
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if self.max_stream_ordering == starting_max_ordering:
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break
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finally:
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self.processing = False
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@defer.inlineCallbacks
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def _unsafe_process(self):
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"""
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Main logic of the push loop without the wrapper function that sets
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up logging, measures and guards against multiple instances of it
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being run.
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"""
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unprocessed = yield self.store.get_unread_push_actions_for_user_in_range(
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self.user_id, self.last_stream_ordering, self.max_stream_ordering
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)
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soonest_due_at = None
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for push_action in unprocessed:
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received_at = push_action['received_ts']
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if received_at is None:
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received_at = 0
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notif_ready_at = received_at + DELAY_BEFORE_MAIL_MS
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room_ready_at = self.room_ready_to_notify_at(
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push_action['room_id']
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)
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should_notify_at = max(notif_ready_at, room_ready_at)
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if should_notify_at < self.clock.time_msec():
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# one of our notifications is ready for sending, so we send
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# *one* email updating the user on their notifications,
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# we then consider all previously outstanding notifications
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# to be delivered.
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yield self.send_notification(unprocessed)
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yield self.save_last_stream_ordering_and_success(max([
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ea['stream_ordering'] for ea in unprocessed
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]))
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yield self.sent_notif_update_throttle(
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push_action['room_id'], push_action
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)
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break
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else:
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if soonest_due_at is None or should_notify_at < soonest_due_at:
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soonest_due_at = should_notify_at
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if self.timed_call is not None:
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self.timed_call.cancel()
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self.timed_call = None
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if soonest_due_at is not None:
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self.timed_call = reactor.callLater(
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self.seconds_until(soonest_due_at), self.on_timer
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)
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@defer.inlineCallbacks
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def save_last_stream_ordering_and_success(self, last_stream_ordering):
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self.last_stream_ordering = last_stream_ordering
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yield self.store.update_pusher_last_stream_ordering_and_success(
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self.app_id, self.email, self.user_id,
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last_stream_ordering, self.clock.time_msec()
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)
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def seconds_until(self, ts_msec):
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return (ts_msec - self.clock.time_msec()) / 1000
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def get_room_throttle_ms(self, room_id):
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if room_id in self.throttle_params:
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return self.throttle_params[room_id]["throttle_ms"]
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else:
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return 0
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def get_room_last_sent_ts(self, room_id):
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if room_id in self.throttle_params:
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return self.throttle_params[room_id]["last_sent_ts"]
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else:
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return 0
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def room_ready_to_notify_at(self, room_id):
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"""
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Determines whether throttling should prevent us from sending an email
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for the given room
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Returns: True if we should send, False if we should not
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"""
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last_sent_ts = self.get_room_last_sent_ts(room_id)
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throttle_ms = self.get_room_throttle_ms(room_id)
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may_send_at = last_sent_ts + throttle_ms
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return may_send_at
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@defer.inlineCallbacks
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def sent_notif_update_throttle(self, room_id, notified_push_action):
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# We have sent a notification, so update the throttle accordingly.
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# If the event that triggered the notif happened more than
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# THROTTLE_RESET_AFTER_MS after the previous one that triggered a
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# notif, we release the throttle. Otherwise, the throttle is increased.
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time_of_previous_notifs = yield self.store.get_time_of_last_push_action_before(
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notified_push_action['stream_ordering']
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)
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time_of_this_notifs = notified_push_action['received_ts']
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if time_of_previous_notifs is not None and time_of_this_notifs is not None:
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gap = time_of_this_notifs - time_of_previous_notifs
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else:
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# if we don't know the arrival time of one of the notifs (it was not
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# stored prior to email notification code) then assume a gap of
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# zero which will just not reset the throttle
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gap = 0
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current_throttle_ms = self.get_room_throttle_ms(room_id)
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if gap > THROTTLE_RESET_AFTER_MS:
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new_throttle_ms = THROTTLE_START_MS
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else:
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if current_throttle_ms == 0:
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new_throttle_ms = THROTTLE_START_MS
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else:
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new_throttle_ms = min(
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current_throttle_ms * THROTTLE_MULTIPLIER,
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THROTTLE_MAX_MS
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)
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self.throttle_params[room_id] = {
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"last_sent_ts": self.clock.time_msec(),
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"throttle_ms": new_throttle_ms
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}
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yield self.store.set_throttle_params(
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self.pusher_id, room_id, self.throttle_params[room_id]
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)
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@defer.inlineCallbacks
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def send_notification(self, push_actions):
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logger.info("Sending notif email for user %r", self.user_id)
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yield self.mailer.send_notification_mail(
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self.user_id, self.email, push_actions
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)
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