318 lines
12 KiB
Python
318 lines
12 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2016 OpenMarket Ltd
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
import logging
|
|
|
|
from twisted.internet.error import AlreadyCalled, AlreadyCancelled
|
|
|
|
from synapse.metrics.background_process_metrics import run_as_background_process
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
# The amount of time we always wait before ever emailing about a notification
|
|
# (to give the user a chance to respond to other push or notice the window)
|
|
DELAY_BEFORE_MAIL_MS = 10 * 60 * 1000
|
|
|
|
# THROTTLE is the minimum time between mail notifications sent for a given room.
|
|
# Each room maintains its own throttle counter, but each new mail notification
|
|
# sends the pending notifications for all rooms.
|
|
THROTTLE_START_MS = 10 * 60 * 1000
|
|
THROTTLE_MAX_MS = 24 * 60 * 60 * 1000 # 24h
|
|
# THROTTLE_MULTIPLIER = 6 # 10 mins, 1 hour, 6 hours, 24 hours
|
|
THROTTLE_MULTIPLIER = 144 # 10 mins, 24 hours - i.e. jump straight to 1 day
|
|
|
|
# If no event triggers a notification for this long after the previous,
|
|
# the throttle is released.
|
|
# 12 hours - a gap of 12 hours in conversation is surely enough to merit a new
|
|
# notification when things get going again...
|
|
THROTTLE_RESET_AFTER_MS = 12 * 60 * 60 * 1000
|
|
|
|
# does each email include all unread notifs, or just the ones which have happened
|
|
# since the last mail?
|
|
# XXX: this is currently broken as it includes ones from parted rooms(!)
|
|
INCLUDE_ALL_UNREAD_NOTIFS = False
|
|
|
|
|
|
class EmailPusher:
|
|
"""
|
|
A pusher that sends email notifications about events (approximately)
|
|
when they happen.
|
|
This shares quite a bit of code with httpusher: it would be good to
|
|
factor out the common parts
|
|
"""
|
|
|
|
def __init__(self, hs, pusherdict, mailer):
|
|
self.hs = hs
|
|
self.mailer = mailer
|
|
|
|
self.store = self.hs.get_datastore()
|
|
self.clock = self.hs.get_clock()
|
|
self.pusher_id = pusherdict["id"]
|
|
self.user_id = pusherdict["user_name"]
|
|
self.app_id = pusherdict["app_id"]
|
|
self.email = pusherdict["pushkey"]
|
|
self.last_stream_ordering = pusherdict["last_stream_ordering"]
|
|
self.timed_call = None
|
|
self.throttle_params = None
|
|
|
|
# See httppusher
|
|
self.max_stream_ordering = None
|
|
|
|
self._is_processing = False
|
|
|
|
def on_started(self, should_check_for_notifs):
|
|
"""Called when this pusher has been started.
|
|
|
|
Args:
|
|
should_check_for_notifs (bool): Whether we should immediately
|
|
check for push to send. Set to False only if it's known there
|
|
is nothing to send
|
|
"""
|
|
if should_check_for_notifs and self.mailer is not None:
|
|
self._start_processing()
|
|
|
|
def on_stop(self):
|
|
if self.timed_call:
|
|
try:
|
|
self.timed_call.cancel()
|
|
except (AlreadyCalled, AlreadyCancelled):
|
|
pass
|
|
self.timed_call = None
|
|
|
|
def on_new_notifications(self, min_stream_ordering, max_stream_ordering):
|
|
if self.max_stream_ordering:
|
|
self.max_stream_ordering = max(
|
|
max_stream_ordering, self.max_stream_ordering
|
|
)
|
|
else:
|
|
self.max_stream_ordering = max_stream_ordering
|
|
self._start_processing()
|
|
|
|
def on_new_receipts(self, min_stream_id, max_stream_id):
|
|
# We could wake up and cancel the timer but there tend to be quite a
|
|
# lot of read receipts so it's probably less work to just let the
|
|
# timer fire
|
|
pass
|
|
|
|
def on_timer(self):
|
|
self.timed_call = None
|
|
self._start_processing()
|
|
|
|
def _start_processing(self):
|
|
if self._is_processing:
|
|
return
|
|
|
|
run_as_background_process("emailpush.process", self._process)
|
|
|
|
def _pause_processing(self):
|
|
"""Used by tests to temporarily pause processing of events.
|
|
|
|
Asserts that its not currently processing.
|
|
"""
|
|
assert not self._is_processing
|
|
self._is_processing = True
|
|
|
|
def _resume_processing(self):
|
|
"""Used by tests to resume processing of events after pausing.
|
|
"""
|
|
assert self._is_processing
|
|
self._is_processing = False
|
|
self._start_processing()
|
|
|
|
async def _process(self):
|
|
# we should never get here if we are already processing
|
|
assert not self._is_processing
|
|
|
|
try:
|
|
self._is_processing = True
|
|
|
|
if self.throttle_params is None:
|
|
# this is our first loop: load up the throttle params
|
|
self.throttle_params = await self.store.get_throttle_params_by_room(
|
|
self.pusher_id
|
|
)
|
|
|
|
# if the max ordering changes while we're running _unsafe_process,
|
|
# call it again, and so on until we've caught up.
|
|
while True:
|
|
starting_max_ordering = self.max_stream_ordering
|
|
try:
|
|
await self._unsafe_process()
|
|
except Exception:
|
|
logger.exception("Exception processing notifs")
|
|
if self.max_stream_ordering == starting_max_ordering:
|
|
break
|
|
finally:
|
|
self._is_processing = False
|
|
|
|
async def _unsafe_process(self):
|
|
"""
|
|
Main logic of the push loop without the wrapper function that sets
|
|
up logging, measures and guards against multiple instances of it
|
|
being run.
|
|
"""
|
|
start = 0 if INCLUDE_ALL_UNREAD_NOTIFS else self.last_stream_ordering
|
|
fn = self.store.get_unread_push_actions_for_user_in_range_for_email
|
|
unprocessed = await fn(self.user_id, start, self.max_stream_ordering)
|
|
|
|
soonest_due_at = None
|
|
|
|
if not unprocessed:
|
|
await self.save_last_stream_ordering_and_success(self.max_stream_ordering)
|
|
return
|
|
|
|
for push_action in unprocessed:
|
|
received_at = push_action["received_ts"]
|
|
if received_at is None:
|
|
received_at = 0
|
|
notif_ready_at = received_at + DELAY_BEFORE_MAIL_MS
|
|
|
|
room_ready_at = self.room_ready_to_notify_at(push_action["room_id"])
|
|
|
|
should_notify_at = max(notif_ready_at, room_ready_at)
|
|
|
|
if should_notify_at < self.clock.time_msec():
|
|
# one of our notifications is ready for sending, so we send
|
|
# *one* email updating the user on their notifications,
|
|
# we then consider all previously outstanding notifications
|
|
# to be delivered.
|
|
|
|
reason = {
|
|
"room_id": push_action["room_id"],
|
|
"now": self.clock.time_msec(),
|
|
"received_at": received_at,
|
|
"delay_before_mail_ms": DELAY_BEFORE_MAIL_MS,
|
|
"last_sent_ts": self.get_room_last_sent_ts(push_action["room_id"]),
|
|
"throttle_ms": self.get_room_throttle_ms(push_action["room_id"]),
|
|
}
|
|
|
|
await self.send_notification(unprocessed, reason)
|
|
|
|
await self.save_last_stream_ordering_and_success(
|
|
max(ea["stream_ordering"] for ea in unprocessed)
|
|
)
|
|
|
|
# we update the throttle on all the possible unprocessed push actions
|
|
for ea in unprocessed:
|
|
await self.sent_notif_update_throttle(ea["room_id"], ea)
|
|
break
|
|
else:
|
|
if soonest_due_at is None or should_notify_at < soonest_due_at:
|
|
soonest_due_at = should_notify_at
|
|
|
|
if self.timed_call is not None:
|
|
try:
|
|
self.timed_call.cancel()
|
|
except (AlreadyCalled, AlreadyCancelled):
|
|
pass
|
|
self.timed_call = None
|
|
|
|
if soonest_due_at is not None:
|
|
self.timed_call = self.hs.get_reactor().callLater(
|
|
self.seconds_until(soonest_due_at), self.on_timer
|
|
)
|
|
|
|
async def save_last_stream_ordering_and_success(self, last_stream_ordering):
|
|
if last_stream_ordering is None:
|
|
# This happens if we haven't yet processed anything
|
|
return
|
|
|
|
self.last_stream_ordering = last_stream_ordering
|
|
pusher_still_exists = await self.store.update_pusher_last_stream_ordering_and_success(
|
|
self.app_id,
|
|
self.email,
|
|
self.user_id,
|
|
last_stream_ordering,
|
|
self.clock.time_msec(),
|
|
)
|
|
if not pusher_still_exists:
|
|
# The pusher has been deleted while we were processing, so
|
|
# lets just stop and return.
|
|
self.on_stop()
|
|
|
|
def seconds_until(self, ts_msec):
|
|
secs = (ts_msec - self.clock.time_msec()) / 1000
|
|
return max(secs, 0)
|
|
|
|
def get_room_throttle_ms(self, room_id):
|
|
if room_id in self.throttle_params:
|
|
return self.throttle_params[room_id]["throttle_ms"]
|
|
else:
|
|
return 0
|
|
|
|
def get_room_last_sent_ts(self, room_id):
|
|
if room_id in self.throttle_params:
|
|
return self.throttle_params[room_id]["last_sent_ts"]
|
|
else:
|
|
return 0
|
|
|
|
def room_ready_to_notify_at(self, room_id):
|
|
"""
|
|
Determines whether throttling should prevent us from sending an email
|
|
for the given room
|
|
Returns: The timestamp when we are next allowed to send an email notif
|
|
for this room
|
|
"""
|
|
last_sent_ts = self.get_room_last_sent_ts(room_id)
|
|
throttle_ms = self.get_room_throttle_ms(room_id)
|
|
|
|
may_send_at = last_sent_ts + throttle_ms
|
|
return may_send_at
|
|
|
|
async def sent_notif_update_throttle(self, room_id, notified_push_action):
|
|
# We have sent a notification, so update the throttle accordingly.
|
|
# If the event that triggered the notif happened more than
|
|
# THROTTLE_RESET_AFTER_MS after the previous one that triggered a
|
|
# notif, we release the throttle. Otherwise, the throttle is increased.
|
|
time_of_previous_notifs = await self.store.get_time_of_last_push_action_before(
|
|
notified_push_action["stream_ordering"]
|
|
)
|
|
|
|
time_of_this_notifs = notified_push_action["received_ts"]
|
|
|
|
if time_of_previous_notifs is not None and time_of_this_notifs is not None:
|
|
gap = time_of_this_notifs - time_of_previous_notifs
|
|
else:
|
|
# if we don't know the arrival time of one of the notifs (it was not
|
|
# stored prior to email notification code) then assume a gap of
|
|
# zero which will just not reset the throttle
|
|
gap = 0
|
|
|
|
current_throttle_ms = self.get_room_throttle_ms(room_id)
|
|
|
|
if gap > THROTTLE_RESET_AFTER_MS:
|
|
new_throttle_ms = THROTTLE_START_MS
|
|
else:
|
|
if current_throttle_ms == 0:
|
|
new_throttle_ms = THROTTLE_START_MS
|
|
else:
|
|
new_throttle_ms = min(
|
|
current_throttle_ms * THROTTLE_MULTIPLIER, THROTTLE_MAX_MS
|
|
)
|
|
self.throttle_params[room_id] = {
|
|
"last_sent_ts": self.clock.time_msec(),
|
|
"throttle_ms": new_throttle_ms,
|
|
}
|
|
await self.store.set_throttle_params(
|
|
self.pusher_id, room_id, self.throttle_params[room_id]
|
|
)
|
|
|
|
async def send_notification(self, push_actions, reason):
|
|
logger.info("Sending notif email for user %r", self.user_id)
|
|
|
|
await self.mailer.send_notification_mail(
|
|
self.app_id, self.user_id, self.email, push_actions, reason
|
|
)
|