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![Erik Johnston](/assets/img/avatar_default.png)
We start all pushers on start up and immediately start a background process to fetch push to send. This makes start up incredibly painful when dealing with many pushers. Instead, let's do a quick fast DB check to see if there *may* be push to send and only start the background processes for those pushers. We also stagger starting up and doing those checks so that we don't try and handle all pushers at once.
300 lines
11 KiB
Python
300 lines
11 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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import logging
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from twisted.internet import defer
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from twisted.internet.error import AlreadyCalled, AlreadyCancelled
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from synapse.metrics.background_process_metrics import run_as_background_process
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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 = 10 * 60 * 1000
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# THROTTLE is the minimum time between mail notifications sent for a given room.
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# Each room maintains its own throttle counter, but each new mail notification
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# sends the pending notifications for all rooms.
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THROTTLE_START_MS = 10 * 60 * 1000
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THROTTLE_MAX_MS = 24 * 60 * 60 * 1000 # 24h
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# THROTTLE_MULTIPLIER = 6 # 10 mins, 1 hour, 6 hours, 24 hours
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THROTTLE_MULTIPLIER = 144 # 10 mins, 24 hours - i.e. jump straight to 1 day
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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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# 12 hours - a gap of 12 hours in conversation is surely enough to merit a new
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# notification when things get going again...
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THROTTLE_RESET_AFTER_MS = (12 * 60 * 60 * 1000)
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# does each email include all unread notifs, or just the ones which have happened
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# since the last mail?
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# XXX: this is currently broken as it includes ones from parted rooms(!)
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INCLUDE_ALL_UNREAD_NOTIFS = False
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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, mailer):
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self.hs = hs
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self.mailer = mailer
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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._is_processing = False
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def on_started(self, should_check_for_notifs):
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"""Called when this pusher has been started.
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Args:
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should_check_for_notifs (bool): Whether we should immediately
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check for push to send. Set to False only if it's known there
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is nothing to send
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"""
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if should_check_for_notifs and self.mailer is not None:
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self._start_processing()
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def on_stop(self):
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if self.timed_call:
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try:
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self.timed_call.cancel()
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except (AlreadyCalled, AlreadyCancelled):
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pass
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self.timed_call = None
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def on_new_notifications(self, min_stream_ordering, max_stream_ordering):
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if self.max_stream_ordering:
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self.max_stream_ordering = max(max_stream_ordering, self.max_stream_ordering)
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else:
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self.max_stream_ordering = max_stream_ordering
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self._start_processing()
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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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pass
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def on_timer(self):
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self.timed_call = None
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self._start_processing()
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def _start_processing(self):
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if self._is_processing:
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return
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run_as_background_process("emailpush.process", self._process)
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@defer.inlineCallbacks
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def _process(self):
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# we should never get here if we are already processing
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assert not self._is_processing
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try:
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self._is_processing = True
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if self.throttle_params is None:
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# this is our first loop: load up the throttle params
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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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# 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 Exception:
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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._is_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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start = 0 if INCLUDE_ALL_UNREAD_NOTIFS else self.last_stream_ordering
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fn = self.store.get_unread_push_actions_for_user_in_range_for_email
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unprocessed = yield fn(self.user_id, start, self.max_stream_ordering)
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soonest_due_at = None
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if not unprocessed:
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yield self.save_last_stream_ordering_and_success(self.max_stream_ordering)
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return
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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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reason = {
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'room_id': push_action['room_id'],
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'now': self.clock.time_msec(),
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'received_at': received_at,
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'delay_before_mail_ms': DELAY_BEFORE_MAIL_MS,
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'last_sent_ts': self.get_room_last_sent_ts(push_action['room_id']),
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'throttle_ms': self.get_room_throttle_ms(push_action['room_id']),
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}
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yield self.send_notification(unprocessed, reason)
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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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# we update the throttle on all the possible unprocessed push actions
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for ea in unprocessed:
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yield self.sent_notif_update_throttle(
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ea['room_id'], ea
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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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try:
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self.timed_call.cancel()
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except (AlreadyCalled, AlreadyCancelled):
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pass
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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 = self.hs.get_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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secs = (ts_msec - self.clock.time_msec()) / 1000
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return max(secs, 0)
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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: The timestamp when we are next allowed to send an email notif
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for this room
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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, reason):
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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.app_id, self.user_id, self.email, push_actions, reason
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)
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