450 lines
16 KiB
Python
450 lines
16 KiB
Python
# 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 typing import TYPE_CHECKING, Dict, Iterable, Optional
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from prometheus_client import Gauge
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from synapse.api.errors import Codes, SynapseError
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from synapse.metrics.background_process_metrics import (
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run_as_background_process,
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wrap_as_background_process,
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)
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from synapse.push import Pusher, PusherConfig, PusherConfigException
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from synapse.push.pusher import PusherFactory
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from synapse.replication.http.push import ReplicationRemovePusherRestServlet
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from synapse.types import JsonDict, RoomStreamToken
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from synapse.util.async_helpers import concurrently_execute
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from synapse.util.threepids import canonicalise_email
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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synapse_pushers = Gauge(
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"synapse_pushers", "Number of active synapse pushers", ["kind", "app_id"]
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)
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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 awaitables.
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"""
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def __init__(self, hs: "HomeServer"):
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self.hs = hs
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self.pusher_factory = PusherFactory(hs)
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self.store = self.hs.get_datastores().main
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self.clock = self.hs.get_clock()
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# We shard the handling of push notifications by user ID.
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self._pusher_shard_config = hs.config.worker.pusher_shard_config
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self._instance_name = hs.get_instance_name()
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self._should_start_pushers = (
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self._instance_name in self._pusher_shard_config.instances
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)
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# We can only delete pushers on master.
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self._remove_pusher_client = None
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if hs.config.worker.worker_app:
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self._remove_pusher_client = ReplicationRemovePusherRestServlet.make_client(
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hs
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)
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# Record the last stream ID that we were poked about so we can get
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# changes since then. We set this to the current max stream ID on
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# startup as every individual pusher will have checked for changes on
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# startup.
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self._last_room_stream_id_seen = self.store.get_room_max_stream_ordering()
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# map from user id to app_id:pushkey to pusher
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self.pushers: Dict[str, Dict[str, Pusher]] = {}
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self._account_validity_handler = hs.get_account_validity_handler()
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def start(self) -> None:
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"""Starts the pushers off in a background process."""
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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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async def add_or_update_pusher(
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self,
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user_id: str,
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access_token: Optional[int],
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kind: str,
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app_id: str,
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app_display_name: str,
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device_display_name: str,
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pushkey: str,
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lang: Optional[str],
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data: JsonDict,
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profile_tag: str = "",
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enabled: bool = True,
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device_id: Optional[str] = None,
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) -> Optional[Pusher]:
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"""Creates a new pusher and adds it to the pool
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Returns:
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The newly created pusher.
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"""
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if kind == "email":
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email_owner = await self.store.get_user_id_by_threepid(
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"email", canonicalise_email(pushkey)
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)
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if email_owner != user_id:
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raise SynapseError(400, "Email not found", Codes.THREEPID_NOT_FOUND)
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time_now_msec = self.clock.time_msec()
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# create the pusher setting last_stream_ordering to the current maximum
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# stream ordering, so it will process pushes from this point onwards.
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last_stream_ordering = self.store.get_room_max_stream_ordering()
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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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PusherConfig(
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id=None,
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user_name=user_id,
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access_token=access_token,
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profile_tag=profile_tag,
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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=last_stream_ordering,
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last_success=None,
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failing_since=None,
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enabled=enabled,
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device_id=device_id,
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)
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)
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# Before we actually persist the pusher, we check if the user already has one
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# this app ID and pushkey. If so, we want to keep the access token and device ID
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# in place, since this could be one device modifying (e.g. enabling/disabling)
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# another device's pusher.
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existing_config = await self._get_pusher_config_for_user_by_app_id_and_pushkey(
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user_id, app_id, pushkey
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)
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if existing_config:
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access_token = existing_config.access_token
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device_id = existing_config.device_id
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await 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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enabled=enabled,
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device_id=device_id,
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)
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pusher = await self.process_pusher_change_by_id(app_id, pushkey, user_id)
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return pusher
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async def remove_pushers_by_app_id_and_pushkey_not_user(
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self, app_id: str, pushkey: str, not_user_id: str
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) -> None:
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to_remove = await 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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await self.remove_pusher(p.app_id, p.pushkey, p.user_name)
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async def remove_pushers_by_access_token(
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self, user_id: str, access_tokens: Iterable[int]
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) -> None:
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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: user to remove pushers for
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access_tokens: access token *ids* to remove pushers for
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"""
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tokens = set(access_tokens)
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for p in await 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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await self.remove_pusher(p.app_id, p.pushkey, p.user_name)
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def on_new_notifications(self, max_token: RoomStreamToken) -> None:
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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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# We just use the minimum stream ordering and ignore the vector clock
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# component. This is safe to do as long as we *always* ignore the vector
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# clock components.
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max_stream_id = max_token.stream
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if max_stream_id < self._last_room_stream_id_seen:
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# Nothing to do
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return
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# We only start a new background process if necessary rather than
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# optimistically (to cut down on overhead).
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self._on_new_notifications(max_token)
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@wrap_as_background_process("on_new_notifications")
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async def _on_new_notifications(self, max_token: RoomStreamToken) -> None:
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# We just use the minimum stream ordering and ignore the vector clock
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# component. This is safe to do as long as we *always* ignore the vector
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# clock components.
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max_stream_id = max_token.stream
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prev_stream_id = self._last_room_stream_id_seen
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self._last_room_stream_id_seen = max_stream_id
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try:
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users_affected = await self.store.get_push_action_users_in_range(
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prev_stream_id, max_stream_id
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)
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for u in users_affected:
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# Don't push if the user account has expired
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expired = await self._account_validity_handler.is_user_expired(u)
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if expired:
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continue
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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(max_token)
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except Exception:
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logger.exception("Exception in pusher on_new_notifications")
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async def on_new_receipts(
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self, min_stream_id: int, max_stream_id: int, affected_room_ids: Iterable[str]
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) -> None:
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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 = await 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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# Don't push if the user account has expired
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expired = await self._account_validity_handler.is_user_expired(u)
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if expired:
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continue
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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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async def _get_pusher_config_for_user_by_app_id_and_pushkey(
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self, user_id: str, app_id: str, pushkey: str
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) -> Optional[PusherConfig]:
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resultlist = await self.store.get_pushers_by_app_id_and_pushkey(app_id, pushkey)
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pusher_config = None
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for r in resultlist:
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if r.user_name == user_id:
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pusher_config = r
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return pusher_config
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async def process_pusher_change_by_id(
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self, app_id: str, pushkey: str, user_id: str
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) -> Optional[Pusher]:
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"""Look up the details for the given pusher, and either start it if its
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"enabled" flag is True, or try to stop it otherwise.
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If the pusher is new and its "enabled" flag is False, the stop is a noop.
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Returns:
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The pusher started, if any
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"""
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if not self._should_start_pushers:
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return None
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if not self._pusher_shard_config.should_handle(self._instance_name, user_id):
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return None
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pusher_config = await self._get_pusher_config_for_user_by_app_id_and_pushkey(
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user_id, app_id, pushkey
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)
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if pusher_config and not pusher_config.enabled:
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self.maybe_stop_pusher(app_id, pushkey, user_id)
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return None
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pusher = None
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if pusher_config:
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pusher = await self._start_pusher(pusher_config)
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return pusher
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async def _start_pushers(self) -> None:
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"""Start all the pushers"""
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pushers = await self.store.get_enabled_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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await concurrently_execute(self._start_pusher, pushers, 10)
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logger.info("Started pushers")
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async def _start_pusher(self, pusher_config: PusherConfig) -> Optional[Pusher]:
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"""Start the given pusher
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Args:
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pusher_config: The pusher configuration with the values pulled from the db table
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Returns:
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The newly created pusher or None.
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"""
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if not self._pusher_shard_config.should_handle(
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self._instance_name, pusher_config.user_name
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):
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return None
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try:
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pusher = self.pusher_factory.create_pusher(pusher_config)
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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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pusher_config.id,
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pusher_config.user_name,
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pusher_config.app_id,
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pusher_config.pushkey,
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e,
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)
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return None
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except Exception:
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logger.exception(
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"Couldn't start pusher id %i: caught Exception",
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pusher_config.id,
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)
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return None
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if not pusher:
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return None
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appid_pushkey = "%s:%s" % (pusher.app_id, pusher.pushkey)
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byuser = self.pushers.setdefault(pusher.user_id, {})
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if appid_pushkey in byuser:
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previous_pusher = byuser[appid_pushkey]
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previous_pusher.on_stop()
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synapse_pushers.labels(
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type(previous_pusher).__name__, previous_pusher.app_id
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).dec()
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byuser[appid_pushkey] = pusher
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synapse_pushers.labels(type(pusher).__name__, pusher.app_id).inc()
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logger.info("Starting pusher %s / %s", pusher.user_id, appid_pushkey)
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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 = pusher.user_id
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last_stream_ordering = pusher.last_stream_ordering
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if last_stream_ordering:
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have_notifs = await 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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pusher.on_started(have_notifs)
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return pusher
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async def remove_pusher(self, app_id: str, pushkey: str, user_id: str) -> None:
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self.maybe_stop_pusher(app_id, pushkey, user_id)
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# We can only delete pushers on master.
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if self._remove_pusher_client:
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await self._remove_pusher_client(
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app_id=app_id, pushkey=pushkey, user_id=user_id
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)
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else:
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await 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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def maybe_stop_pusher(self, app_id: str, pushkey: str, user_id: str) -> None:
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"""Stops a pusher with the given app ID and push key if one is running.
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Args:
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app_id: the pusher's app ID.
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pushkey: the pusher's push key.
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user_id: the user the pusher belongs to. Only used for logging.
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"""
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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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pusher = byuser.pop(appid_pushkey)
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pusher.on_stop()
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synapse_pushers.labels(type(pusher).__name__, pusher.app_id).dec()
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