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c9dbee50ae
`pusher_pool.on_new_notifications` expected a min and max stream ID, however that was not what we were passing in. Instead, let's just pass it the current max stream ID and have it track the last stream ID it got passed. I believe that it mostly worked as we called the function for every event. However, it would break for events that got persisted out of order, i.e, that were persisted but the max stream ID wasn't incremented as not all preceding events had finished persisting, and push for that event would be delayed until another event got pushed to the effected users.
318 lines
12 KiB
Python
318 lines
12 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.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:
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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, max_stream_ordering):
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if self.max_stream_ordering:
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self.max_stream_ordering = max(
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max_stream_ordering, self.max_stream_ordering
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)
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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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def _pause_processing(self):
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"""Used by tests to temporarily pause processing of events.
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Asserts that its not currently processing.
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"""
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assert not self._is_processing
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self._is_processing = True
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def _resume_processing(self):
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"""Used by tests to resume processing of events after pausing.
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"""
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assert self._is_processing
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self._is_processing = False
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self._start_processing()
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async 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 = await 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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await 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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async 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 = await 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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await 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(push_action["room_id"])
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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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await self.send_notification(unprocessed, reason)
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await self.save_last_stream_ordering_and_success(
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max(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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await self.sent_notif_update_throttle(ea["room_id"], ea)
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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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async def save_last_stream_ordering_and_success(self, last_stream_ordering):
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if last_stream_ordering is None:
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# This happens if we haven't yet processed anything
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return
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self.last_stream_ordering = last_stream_ordering
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pusher_still_exists = await self.store.update_pusher_last_stream_ordering_and_success(
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self.app_id,
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self.email,
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self.user_id,
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last_stream_ordering,
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self.clock.time_msec(),
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)
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if not pusher_still_exists:
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# The pusher has been deleted while we were processing, so
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# lets just stop and return.
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self.on_stop()
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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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async 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 = await 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, 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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await 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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async 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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await 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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