340 lines
12 KiB
Python
340 lines
12 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Copyright 2015, 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 collections import defaultdict
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from threading import Lock
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from typing import Dict, Tuple, Union
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from twisted.internet import defer
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from synapse.metrics import LaterGauge
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.push import PusherConfigException
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from synapse.push.emailpusher import EmailPusher
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from synapse.push.httppusher import HttpPusher
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from synapse.push.pusher import PusherFactory
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from synapse.util.async_helpers import concurrently_execute
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logger = logging.getLogger(__name__)
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class PusherPool:
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"""
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The pusher pool. This is responsible for dispatching notifications of new events to
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the http and email pushers.
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It provides three methods which are designed to be called by the rest of the
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application: `start`, `on_new_notifications`, and `on_new_receipts`: each of these
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delegates to each of the relevant pushers.
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Note that it is expected that each pusher will have its own 'processing' loop which
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will send out the notifications in the background, rather than blocking until the
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notifications are sent; accordingly Pusher.on_started, Pusher.on_new_notifications and
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Pusher.on_new_receipts are not expected to return deferreds.
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"""
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def __init__(self, _hs):
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self.hs = _hs
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self.pusher_factory = PusherFactory(_hs)
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self._should_start_pushers = _hs.config.start_pushers
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self.store = self.hs.get_datastore()
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self.clock = self.hs.get_clock()
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# map from user id to app_id:pushkey to pusher
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self.pushers = {} # type: Dict[str, Dict[str, Union[HttpPusher, EmailPusher]]]
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# a lock for the pushers dict, since `count_pushers` is called from an different
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# and we otherwise get concurrent modification errors
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self._pushers_lock = Lock()
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def count_pushers():
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results = defaultdict(int) # type: Dict[Tuple[str, str], int]
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with self._pushers_lock:
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for pushers in self.pushers.values():
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for pusher in pushers.values():
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k = (type(pusher).__name__, pusher.app_id)
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results[k] += 1
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return results
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LaterGauge(
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name="synapse_pushers",
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desc="the number of active pushers",
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labels=["kind", "app_id"],
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caller=count_pushers,
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)
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def start(self):
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"""Starts the pushers off in a background process.
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"""
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if not self._should_start_pushers:
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logger.info("Not starting pushers because they are disabled in the config")
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return
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run_as_background_process("start_pushers", self._start_pushers)
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@defer.inlineCallbacks
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def add_pusher(
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self,
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user_id,
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access_token,
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kind,
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app_id,
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app_display_name,
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device_display_name,
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pushkey,
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lang,
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data,
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profile_tag="",
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):
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"""Creates a new pusher and adds it to the pool
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Returns:
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Deferred[EmailPusher|HttpPusher]
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"""
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time_now_msec = self.clock.time_msec()
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# we try to create the pusher just to validate the config: it
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# will then get pulled out of the database,
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# recreated, added and started: this means we have only one
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# code path adding pushers.
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self.pusher_factory.create_pusher(
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{
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"id": None,
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"user_name": user_id,
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"kind": kind,
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"app_id": app_id,
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"app_display_name": app_display_name,
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"device_display_name": device_display_name,
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"pushkey": pushkey,
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"ts": time_now_msec,
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"lang": lang,
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"data": data,
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"last_stream_ordering": None,
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"last_success": None,
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"failing_since": None,
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}
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)
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# create the pusher setting last_stream_ordering to the current maximum
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# stream ordering in event_push_actions, so it will process
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# pushes from this point onwards.
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last_stream_ordering = yield self.store.get_latest_push_action_stream_ordering()
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yield self.store.add_pusher(
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user_id=user_id,
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access_token=access_token,
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kind=kind,
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app_id=app_id,
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app_display_name=app_display_name,
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device_display_name=device_display_name,
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pushkey=pushkey,
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pushkey_ts=time_now_msec,
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lang=lang,
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data=data,
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last_stream_ordering=last_stream_ordering,
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profile_tag=profile_tag,
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)
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pusher = yield self.start_pusher_by_id(app_id, pushkey, user_id)
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return pusher
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@defer.inlineCallbacks
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def remove_pushers_by_app_id_and_pushkey_not_user(
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self, app_id, pushkey, not_user_id
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):
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to_remove = yield self.store.get_pushers_by_app_id_and_pushkey(app_id, pushkey)
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for p in to_remove:
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if p["user_name"] != not_user_id:
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logger.info(
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"Removing pusher for app id %s, pushkey %s, user %s",
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app_id,
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pushkey,
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p["user_name"],
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)
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yield self.remove_pusher(p["app_id"], p["pushkey"], p["user_name"])
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@defer.inlineCallbacks
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def remove_pushers_by_access_token(self, user_id, access_tokens):
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"""Remove the pushers for a given user corresponding to a set of
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access_tokens.
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Args:
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user_id (str): user to remove pushers for
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access_tokens (Iterable[int]): access token *ids* to remove pushers
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for
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"""
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tokens = set(access_tokens)
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for p in (yield self.store.get_pushers_by_user_id(user_id)):
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if p["access_token"] in tokens:
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logger.info(
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"Removing pusher for app id %s, pushkey %s, user %s",
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p["app_id"],
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p["pushkey"],
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p["user_name"],
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)
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yield self.remove_pusher(p["app_id"], p["pushkey"], p["user_name"])
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@defer.inlineCallbacks
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def on_new_notifications(self, min_stream_id, max_stream_id):
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if not self.pushers:
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# nothing to do here.
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return
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try:
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users_affected = yield self.store.get_push_action_users_in_range(
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min_stream_id, max_stream_id
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)
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for u in users_affected:
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if u in self.pushers:
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for p in self.pushers[u].values():
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p.on_new_notifications(min_stream_id, max_stream_id)
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except Exception:
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logger.exception("Exception in pusher on_new_notifications")
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@defer.inlineCallbacks
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def on_new_receipts(self, min_stream_id, max_stream_id, affected_room_ids):
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if not self.pushers:
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# nothing to do here.
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return
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try:
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# Need to subtract 1 from the minimum because the lower bound here
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# is not inclusive
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users_affected = yield self.store.get_users_sent_receipts_between(
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min_stream_id - 1, max_stream_id
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)
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for u in users_affected:
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if u in self.pushers:
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for p in self.pushers[u].values():
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p.on_new_receipts(min_stream_id, max_stream_id)
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except Exception:
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logger.exception("Exception in pusher on_new_receipts")
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@defer.inlineCallbacks
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def start_pusher_by_id(self, app_id, pushkey, user_id):
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"""Look up the details for the given pusher, and start it
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Returns:
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Deferred[EmailPusher|HttpPusher|None]: The pusher started, if any
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"""
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if not self._should_start_pushers:
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return
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resultlist = yield self.store.get_pushers_by_app_id_and_pushkey(app_id, pushkey)
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pusher_dict = None
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for r in resultlist:
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if r["user_name"] == user_id:
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pusher_dict = r
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pusher = None
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if pusher_dict:
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pusher = yield self._start_pusher(pusher_dict)
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return pusher
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@defer.inlineCallbacks
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def _start_pushers(self):
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"""Start all the pushers
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Returns:
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Deferred
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"""
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pushers = yield self.store.get_all_pushers()
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# Stagger starting up the pushers so we don't completely drown the
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# process on start up.
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yield concurrently_execute(self._start_pusher, pushers, 10)
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logger.info("Started pushers")
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@defer.inlineCallbacks
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def _start_pusher(self, pusherdict):
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"""Start the given pusher
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Args:
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pusherdict (dict): dict with the values pulled from the db table
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Returns:
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Deferred[EmailPusher|HttpPusher]
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"""
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try:
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p = self.pusher_factory.create_pusher(pusherdict)
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except PusherConfigException as e:
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logger.warning(
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"Pusher incorrectly configured id=%i, user=%s, appid=%s, pushkey=%s: %s",
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pusherdict["id"],
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pusherdict.get("user_name"),
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pusherdict.get("app_id"),
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pusherdict.get("pushkey"),
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e,
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)
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return
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except Exception:
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logger.exception(
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"Couldn't start pusher id %i: caught Exception", pusherdict["id"],
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)
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return
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if not p:
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return
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appid_pushkey = "%s:%s" % (pusherdict["app_id"], pusherdict["pushkey"])
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with self._pushers_lock:
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byuser = self.pushers.setdefault(pusherdict["user_name"], {})
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if appid_pushkey in byuser:
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byuser[appid_pushkey].on_stop()
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byuser[appid_pushkey] = p
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# Check if there *may* be push to process. We do this as this check is a
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# lot cheaper to do than actually fetching the exact rows we need to
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# push.
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user_id = pusherdict["user_name"]
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last_stream_ordering = pusherdict["last_stream_ordering"]
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if last_stream_ordering:
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have_notifs = yield self.store.get_if_maybe_push_in_range_for_user(
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user_id, last_stream_ordering
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)
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else:
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# We always want to default to starting up the pusher rather than
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# risk missing push.
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have_notifs = True
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p.on_started(have_notifs)
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return p
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@defer.inlineCallbacks
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def remove_pusher(self, app_id, pushkey, user_id):
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appid_pushkey = "%s:%s" % (app_id, pushkey)
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byuser = self.pushers.get(user_id, {})
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if appid_pushkey in byuser:
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logger.info("Stopping pusher %s / %s", user_id, appid_pushkey)
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byuser[appid_pushkey].on_stop()
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with self._pushers_lock:
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del byuser[appid_pushkey]
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yield self.store.delete_pusher_by_app_id_pushkey_user_id(
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app_id, pushkey, user_id
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)
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