460 lines
18 KiB
Python
460 lines
18 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, Collection, Dict, List, Optional, Union
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from prometheus_client import Counter
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from twisted.internet import defer
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import synapse
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from synapse.api.constants import EventTypes
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from synapse.appservice import ApplicationService
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from synapse.events import EventBase
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from synapse.handlers.presence import format_user_presence_state
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from synapse.logging.context import make_deferred_yieldable, run_in_background
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from synapse.metrics import (
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event_processing_loop_counter,
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event_processing_loop_room_count,
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)
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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.storage.databases.main.directory import RoomAliasMapping
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from synapse.types import JsonDict, RoomAlias, RoomStreamToken, UserID
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from synapse.util.metrics import Measure
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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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events_processed_counter = Counter("synapse_handlers_appservice_events_processed", "")
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class ApplicationServicesHandler:
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastore()
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self.is_mine_id = hs.is_mine_id
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self.appservice_api = hs.get_application_service_api()
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self.scheduler = hs.get_application_service_scheduler()
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self.started_scheduler = False
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self.clock = hs.get_clock()
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self.notify_appservices = hs.config.notify_appservices
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self.event_sources = hs.get_event_sources()
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self.current_max = 0
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self.is_processing = False
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def notify_interested_services(self, max_token: RoomStreamToken):
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"""Notifies (pushes) all application services interested in this event.
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Pushing is done asynchronously, so this method won't block for any
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prolonged length of time.
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"""
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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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current_id = max_token.stream
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services = self.store.get_app_services()
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if not services or not self.notify_appservices:
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return
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self.current_max = max(self.current_max, current_id)
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if self.is_processing:
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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._notify_interested_services(max_token)
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@wrap_as_background_process("notify_interested_services")
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async def _notify_interested_services(self, max_token: RoomStreamToken):
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with Measure(self.clock, "notify_interested_services"):
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self.is_processing = True
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try:
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limit = 100
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upper_bound = -1
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while upper_bound < self.current_max:
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(
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upper_bound,
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events,
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) = await self.store.get_new_events_for_appservice(
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self.current_max, limit
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)
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events_by_room: Dict[str, List[EventBase]] = {}
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for event in events:
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events_by_room.setdefault(event.room_id, []).append(event)
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async def handle_event(event):
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# Gather interested services
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services = await self._get_services_for_event(event)
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if len(services) == 0:
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return # no services need notifying
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# Do we know this user exists? If not, poke the user
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# query API for all services which match that user regex.
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# This needs to block as these user queries need to be
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# made BEFORE pushing the event.
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await self._check_user_exists(event.sender)
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if event.type == EventTypes.Member:
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await self._check_user_exists(event.state_key)
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if not self.started_scheduler:
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async def start_scheduler():
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try:
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return await self.scheduler.start()
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except Exception:
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logger.error("Application Services Failure")
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run_as_background_process("as_scheduler", start_scheduler)
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self.started_scheduler = True
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# Fork off pushes to these services
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for service in services:
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self.scheduler.submit_event_for_as(service, event)
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now = self.clock.time_msec()
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ts = await self.store.get_received_ts(event.event_id)
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synapse.metrics.event_processing_lag_by_event.labels(
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"appservice_sender"
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).observe((now - ts) / 1000)
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async def handle_room_events(events):
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for event in events:
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await handle_event(event)
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await make_deferred_yieldable(
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defer.gatherResults(
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[
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run_in_background(handle_room_events, evs)
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for evs in events_by_room.values()
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],
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consumeErrors=True,
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)
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)
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await self.store.set_appservice_last_pos(upper_bound)
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synapse.metrics.event_processing_positions.labels(
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"appservice_sender"
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).set(upper_bound)
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events_processed_counter.inc(len(events))
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event_processing_loop_room_count.labels("appservice_sender").inc(
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len(events_by_room)
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)
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event_processing_loop_counter.labels("appservice_sender").inc()
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if events:
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now = self.clock.time_msec()
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ts = await self.store.get_received_ts(events[-1].event_id)
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synapse.metrics.event_processing_lag.labels(
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"appservice_sender"
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).set(now - ts)
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synapse.metrics.event_processing_last_ts.labels(
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"appservice_sender"
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).set(ts)
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finally:
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self.is_processing = False
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def notify_interested_services_ephemeral(
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self,
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stream_key: str,
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new_token: Optional[int],
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users: Optional[Collection[Union[str, UserID]]] = None,
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):
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"""This is called by the notifier in the background
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when a ephemeral event handled by the homeserver.
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This will determine which appservices
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are interested in the event, and submit them.
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Events will only be pushed to appservices
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that have opted into ephemeral events
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Args:
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stream_key: The stream the event came from.
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new_token: The latest stream token
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users: The user(s) involved with the event.
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"""
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if not self.notify_appservices:
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return
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if stream_key not in ("typing_key", "receipt_key", "presence_key"):
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return
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services = [
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service
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for service in self.store.get_app_services()
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if service.supports_ephemeral
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]
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if not services:
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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._notify_interested_services_ephemeral(
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services, stream_key, new_token, users or []
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)
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@wrap_as_background_process("notify_interested_services_ephemeral")
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async def _notify_interested_services_ephemeral(
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self,
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services: List[ApplicationService],
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stream_key: str,
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new_token: Optional[int],
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users: Collection[Union[str, UserID]],
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):
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logger.debug("Checking interested services for %s" % (stream_key))
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with Measure(self.clock, "notify_interested_services_ephemeral"):
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for service in services:
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# Only handle typing if we have the latest token
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if stream_key == "typing_key" and new_token is not None:
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events = await self._handle_typing(service, new_token)
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if events:
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self.scheduler.submit_ephemeral_events_for_as(service, events)
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# We don't persist the token for typing_key for performance reasons
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elif stream_key == "receipt_key":
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events = await self._handle_receipts(service)
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if events:
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self.scheduler.submit_ephemeral_events_for_as(service, events)
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await self.store.set_type_stream_id_for_appservice(
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service, "read_receipt", new_token
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)
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elif stream_key == "presence_key":
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events = await self._handle_presence(service, users)
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if events:
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self.scheduler.submit_ephemeral_events_for_as(service, events)
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await self.store.set_type_stream_id_for_appservice(
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service, "presence", new_token
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)
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async def _handle_typing(
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self, service: ApplicationService, new_token: int
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) -> List[JsonDict]:
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typing_source = self.event_sources.sources["typing"]
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# Get the typing events from just before current
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typing, _ = await typing_source.get_new_events_as(
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service=service,
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# For performance reasons, we don't persist the previous
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# token in the DB and instead fetch the latest typing information
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# for appservices.
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from_key=new_token - 1,
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)
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return typing
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async def _handle_receipts(self, service: ApplicationService) -> List[JsonDict]:
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from_key = await self.store.get_type_stream_id_for_appservice(
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service, "read_receipt"
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)
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receipts_source = self.event_sources.sources["receipt"]
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receipts, _ = await receipts_source.get_new_events_as(
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service=service, from_key=from_key
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)
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return receipts
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async def _handle_presence(
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self, service: ApplicationService, users: Collection[Union[str, UserID]]
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) -> List[JsonDict]:
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events: List[JsonDict] = []
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presence_source = self.event_sources.sources["presence"]
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from_key = await self.store.get_type_stream_id_for_appservice(
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service, "presence"
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)
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for user in users:
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if isinstance(user, str):
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user = UserID.from_string(user)
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interested = await service.is_interested_in_presence(user, self.store)
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if not interested:
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continue
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presence_events, _ = await presence_source.get_new_events(
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user=user,
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service=service,
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from_key=from_key,
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)
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time_now = self.clock.time_msec()
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events.extend(
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{
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"type": "m.presence",
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"sender": event.user_id,
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"content": format_user_presence_state(
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event, time_now, include_user_id=False
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),
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}
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for event in presence_events
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)
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return events
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async def query_user_exists(self, user_id: str) -> bool:
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"""Check if any application service knows this user_id exists.
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Args:
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user_id: The user to query if they exist on any AS.
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Returns:
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True if this user exists on at least one application service.
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"""
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user_query_services = self._get_services_for_user(user_id=user_id)
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for user_service in user_query_services:
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is_known_user = await self.appservice_api.query_user(user_service, user_id)
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if is_known_user:
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return True
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return False
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async def query_room_alias_exists(
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self, room_alias: RoomAlias
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) -> Optional[RoomAliasMapping]:
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"""Check if an application service knows this room alias exists.
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Args:
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room_alias: The room alias to query.
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Returns:
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namedtuple: with keys "room_id" and "servers" or None if no
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association can be found.
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"""
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room_alias_str = room_alias.to_string()
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services = self.store.get_app_services()
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alias_query_services = [
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s for s in services if (s.is_interested_in_alias(room_alias_str))
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]
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for alias_service in alias_query_services:
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is_known_alias = await self.appservice_api.query_alias(
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alias_service, room_alias_str
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)
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if is_known_alias:
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# the alias exists now so don't query more ASes.
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return await self.store.get_association_from_room_alias(room_alias)
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return None
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async def query_3pe(
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self, kind: str, protocol: str, fields: Dict[bytes, List[bytes]]
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) -> List[JsonDict]:
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services = self._get_services_for_3pn(protocol)
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results = await make_deferred_yieldable(
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defer.DeferredList(
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[
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run_in_background(
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self.appservice_api.query_3pe, service, kind, protocol, fields
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)
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for service in services
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],
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consumeErrors=True,
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)
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)
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ret = []
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for (success, result) in results:
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if success:
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ret.extend(result)
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return ret
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async def get_3pe_protocols(
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self, only_protocol: Optional[str] = None
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) -> Dict[str, JsonDict]:
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services = self.store.get_app_services()
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protocols: Dict[str, List[JsonDict]] = {}
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# Collect up all the individual protocol responses out of the ASes
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for s in services:
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for p in s.protocols:
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if only_protocol is not None and p != only_protocol:
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continue
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if p not in protocols:
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protocols[p] = []
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info = await self.appservice_api.get_3pe_protocol(s, p)
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if info is not None:
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protocols[p].append(info)
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def _merge_instances(infos: List[JsonDict]) -> JsonDict:
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# Merge the 'instances' lists of multiple results, but just take
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# the other fields from the first as they ought to be identical
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# copy the result so as not to corrupt the cached one
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combined = dict(infos[0])
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combined["instances"] = list(combined["instances"])
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for info in infos[1:]:
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combined["instances"].extend(info["instances"])
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return combined
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return {
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p: _merge_instances(protocols[p]) for p in protocols.keys() if protocols[p]
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}
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async def _get_services_for_event(
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self, event: EventBase
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) -> List[ApplicationService]:
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"""Retrieve a list of application services interested in this event.
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Args:
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event: The event to check. Can be None if alias_list is not.
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Returns:
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A list of services interested in this event based on the service regex.
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"""
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services = self.store.get_app_services()
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# we can't use a list comprehension here. Since python 3, list
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# comprehensions use a generator internally. This means you can't yield
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# inside of a list comprehension anymore.
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interested_list = []
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for s in services:
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if await s.is_interested(event, self.store):
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interested_list.append(s)
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return interested_list
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def _get_services_for_user(self, user_id: str) -> List[ApplicationService]:
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services = self.store.get_app_services()
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return [s for s in services if (s.is_interested_in_user(user_id))]
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def _get_services_for_3pn(self, protocol: str) -> List[ApplicationService]:
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services = self.store.get_app_services()
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return [s for s in services if s.is_interested_in_protocol(protocol)]
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async def _is_unknown_user(self, user_id: str) -> bool:
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if not self.is_mine_id(user_id):
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# we don't know if they are unknown or not since it isn't one of our
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# users. We can't poke ASes.
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return False
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user_info = await self.store.get_user_by_id(user_id)
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if user_info:
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return False
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# user not found; could be the AS though, so check.
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services = self.store.get_app_services()
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service_list = [s for s in services if s.sender == user_id]
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return len(service_list) == 0
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async def _check_user_exists(self, user_id: str) -> bool:
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unknown_user = await self._is_unknown_user(user_id)
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if unknown_user:
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return await self.query_user_exists(user_id)
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return True
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