52c43d91f5
Here we add the ability for the application service ephemeral message processor to handle new events on the "to_device" stream. We keep track of a stream id (token) per application service, and every time a new to-device message comes in, for each appservice we pull the messages between the last-recorded and current stream id and check whether any of the messages are for a user in that appservice's user namespace. get_new_messages is implemented in the next commit.
718 lines
29 KiB
Python
718 lines
29 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 (
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TYPE_CHECKING,
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Collection,
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Dict,
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Iterable,
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List,
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Optional,
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Tuple,
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Union,
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)
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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.async_helpers import Linearizer
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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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MAX_TO_DEVICE_MESSAGES_PER_AS_TRANSACTION = 100
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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.appservice.notify_appservices
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self.event_sources = hs.get_event_sources()
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self.msc2409_to_device_messages_enabled = (
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hs.config.experimental.msc2409_to_device_messages_enabled
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)
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self.current_max = 0
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self.is_processing = False
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self._ephemeral_events_linearizer = Linearizer(
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name="appservice_ephemeral_events"
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)
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def notify_interested_services(self, max_token: RoomStreamToken) -> None:
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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) -> None:
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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: EventBase) -> None:
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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() -> None:
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try:
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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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assert ts is not None
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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: Iterable[EventBase]) -> None:
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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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assert ts is not None
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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: Union[int, RoomStreamToken],
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users: Collection[Union[str, UserID]],
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) -> None:
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"""
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This is called by the notifier in the background when an ephemeral event is handled
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by the homeserver.
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This will determine which appservices are interested in the event, and submit them.
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Args:
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stream_key: The stream the event came from.
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`stream_key` can be "typing_key", "receipt_key", "presence_key" or
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"to_device_key". Any other value for `stream_key` will cause this function
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to return early.
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Ephemeral events will only be pushed to appservices that have opted into
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receiving them by setting `push_ephemeral` to true in their registration
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file. Note that while MSC2409 is experimental, this option is called
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`de.sorunome.msc2409.push_ephemeral`.
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Appservices will only receive ephemeral events that fall within their
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registered user and room namespaces.
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new_token: The stream token of the event.
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users: The users that should be informed of the new event, if any.
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"""
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if not self.notify_appservices:
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return
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# Assert that new_token is an integer (and not a RoomStreamToken).
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# All of the supported streams that this function handles use an
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# integer to track progress (rather than a RoomStreamToken - a
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# vector clock implementation) as they don't support multiple
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# stream writers.
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#
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# As a result, we simply assert that new_token is an integer.
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# If we do end up needing to pass a RoomStreamToken down here
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# in the future, using RoomStreamToken.stream (the minimum stream
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# position) to convert to an ascending integer value should work.
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# Additional context: https://github.com/matrix-org/synapse/pull/11137
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assert isinstance(new_token, int)
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# Ignore to-device messages if the feature flag is not enabled
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if (
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stream_key == "to_device_key"
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and not self.msc2409_to_device_messages_enabled
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):
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return
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# Check whether there are any appservices which have registered to receive
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# ephemeral events.
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#
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# Note that whether these events are actually relevant to these appservices
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# is decided later on.
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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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# Bail out early if none of the target appservices have explicitly registered
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# to receive these ephemeral events.
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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
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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: int,
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users: Collection[Union[str, UserID]],
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) -> None:
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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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if stream_key == "typing_key":
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# Note that we don't persist the token (via set_type_stream_id_for_appservice)
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# for typing_key due to performance reasons and due to their highly
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# ephemeral nature.
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#
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# Instead we simply grab the latest typing updates in _handle_typing
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# and, if they apply to this application service, send it off.
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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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continue
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# Since we read/update the stream position for this AS/stream
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with (
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await self._ephemeral_events_linearizer.queue(
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(service.id, stream_key)
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)
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):
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if stream_key == "receipt_key":
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events = await self._handle_receipts(service, new_token)
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if events:
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self.scheduler.submit_ephemeral_events_for_as(
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service, events
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)
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# Persist the latest handled stream token for this appservice
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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, new_token)
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if events:
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self.scheduler.submit_ephemeral_events_for_as(
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service, events
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)
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# Persist the latest handled stream token for this appservice
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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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elif (
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stream_key == "to_device_key"
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and new_token is not None
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and self.msc2409_to_device_messages_enabled
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):
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# Retrieve an iterable of to-device message events, as well as the
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# maximum stream token of the messages we were able to retrieve.
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events, max_stream_token = await self._handle_to_device(
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service, new_token, users
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)
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if events:
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self.scheduler.submit_ephemeral_events_for_as(
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service, events
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)
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# TODO: If max_stream_token != new_token, schedule another transaction immediately,
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# instead of waiting for another to-device to be sent?
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# https://github.com/matrix-org/synapse/issues/11150#issuecomment-960726449
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# Persist the latest handled stream token for this appservice
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await self.store.set_type_stream_id_for_appservice(
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service, "to_device", max_stream_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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"""
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Return the typing events since the given stream token that the given application
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service should receive.
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First fetch all typing events between the given typing stream token (non-inclusive)
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and the latest typing event stream token (inclusive). Then return only those typing
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events that the given application service may be interested in.
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Args:
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service: The application service to check for which events it should receive.
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new_token: A typing event stream token.
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Returns:
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A list of JSON dictionaries containing data derived from the typing events that
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should be sent to the given application service.
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"""
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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 event
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# for appservices.
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# TODO: It'd likely be more efficient to simply fetch the
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# typing event with the given 'new_token' stream token and
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# check if the given service was interested, rather than
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# iterating over all typing events and only grabbing the
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# latest few.
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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(
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self, service: ApplicationService, new_token: Optional[int]
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) -> List[JsonDict]:
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"""
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Return the latest read receipts that the given application service should receive.
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First fetch all read receipts between the last receipt stream token that this
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application service should have previously received (non-inclusive) and the
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latest read receipt stream token (inclusive). Then from that set, return only
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those read receipts that the given application service may be interested in.
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Args:
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service: The application service to check for which events it should receive.
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new_token: A receipts event stream token. Purely used to double-check that the
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from_token we pull from the database isn't greater than or equal to this
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token. Prevents accidentally duplicating work.
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Returns:
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A list of JSON dictionaries containing data derived from the read receipts that
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should be sent to the given application service.
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"""
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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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if new_token is not None and new_token <= from_key:
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logger.debug(
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"Rejecting token lower than or equal to stored: %s" % (new_token,)
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)
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return []
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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,
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service: ApplicationService,
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users: Collection[Union[str, UserID]],
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new_token: Optional[int],
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) -> List[JsonDict]:
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"""
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Return the latest presence updates that the given application service should receive.
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First, filter the given users list to those that the application service is
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interested in. Then retrieve the latest presence updates since the
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the last-known previously received presence stream token for the given
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application service. Return those presence updates.
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Args:
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service: The application service that ephemeral events are being sent to.
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users: The users that should receive the presence update.
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new_token: A presence update stream token. Purely used to double-check that the
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from_token we pull from the database isn't greater than or equal to this
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token. Prevents accidentally duplicating work.
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Returns:
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A list of json dictionaries containing data derived from the presence events
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that should be sent to the given application service.
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"""
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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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if new_token is not None and new_token <= from_key:
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logger.debug(
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"Rejecting token lower than or equal to stored: %s" % (new_token,)
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)
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return []
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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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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 _handle_to_device(
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self,
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service: ApplicationService,
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new_token: int,
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users: Collection[Union[str, UserID]],
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) -> Tuple[List[JsonDict], int]:
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"""
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Given an application service, determine which events it should receive
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from those between the last-recorded typing event stream token for this
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appservice and the given stream token.
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Args:
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service: The application service to check for which events it should receive.
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new_token: The latest to-device event stream token.
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users: The users that should receive new to-device messages.
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Returns:
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A two-tuple containing the following:
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* A list of JSON dictionaries containing data derived from the typing events
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that should be sent to the given application service.
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* The last-processed to-device message's stream id. If this does not equal
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`new_token` then there are likely more events to send.
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"""
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# Get the stream token that this application service has processed up until
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from_key = await self.store.get_type_stream_id_for_appservice(
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service, "to_device"
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)
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|
|
|
# Filter out users that this appservice is not interested in
|
|
users_appservice_is_interested_in: List[str] = []
|
|
for user in users:
|
|
if isinstance(user, UserID):
|
|
user = user.to_string()
|
|
|
|
if service.is_interested_in_user(user):
|
|
users_appservice_is_interested_in.append(user)
|
|
|
|
if not users_appservice_is_interested_in:
|
|
# Return early if the AS was not interested in any of these users
|
|
return [], new_token
|
|
|
|
# Retrieve the to-device messages for each user
|
|
(
|
|
recipient_user_id_device_id_to_messages,
|
|
# Record the maximum stream token of the retrieved messages that
|
|
# this function was able to pull before hitting the max to-device
|
|
# message count limit.
|
|
# We return this value later, to ensure we only record the stream
|
|
# token we managed to get up to, so that the rest can be sent later.
|
|
max_stream_token,
|
|
) = await self.store.get_new_messages(
|
|
users_appservice_is_interested_in,
|
|
from_key,
|
|
new_token,
|
|
limit=MAX_TO_DEVICE_MESSAGES_PER_AS_TRANSACTION,
|
|
)
|
|
|
|
# According to MSC2409, we'll need to add 'to_user_id' and 'to_device_id' fields
|
|
# to the event JSON so that the application service will know which user/device
|
|
# combination this messages was intended for.
|
|
#
|
|
# So we mangle this dict into a flat list of to-device messages with the relevant
|
|
# user ID and device ID embedded inside each message dict.
|
|
message_payload: List[JsonDict] = []
|
|
for (
|
|
user_id,
|
|
device_id,
|
|
), messages in recipient_user_id_device_id_to_messages.items():
|
|
for message_json in messages:
|
|
# Remove 'message_id' from the to-device message, as it's an internal ID
|
|
message_json.pop("message_id", None)
|
|
|
|
message_payload.append(
|
|
{
|
|
"to_user_id": user_id,
|
|
"to_device_id": device_id,
|
|
**message_json,
|
|
}
|
|
)
|
|
|
|
return message_payload, max_stream_token
|
|
|
|
async def query_user_exists(self, user_id: str) -> bool:
|
|
"""Check if any application service knows this user_id exists.
|
|
|
|
Args:
|
|
user_id: The user to query if they exist on any AS.
|
|
Returns:
|
|
True if this user exists on at least one application service.
|
|
"""
|
|
user_query_services = self._get_services_for_user(user_id=user_id)
|
|
for user_service in user_query_services:
|
|
is_known_user = await self.appservice_api.query_user(user_service, user_id)
|
|
if is_known_user:
|
|
return True
|
|
return False
|
|
|
|
async def query_room_alias_exists(
|
|
self, room_alias: RoomAlias
|
|
) -> Optional[RoomAliasMapping]:
|
|
"""Check if an application service knows this room alias exists.
|
|
|
|
Args:
|
|
room_alias: The room alias to query.
|
|
Returns:
|
|
namedtuple: with keys "room_id" and "servers" or None if no
|
|
association can be found.
|
|
"""
|
|
room_alias_str = room_alias.to_string()
|
|
services = self.store.get_app_services()
|
|
alias_query_services = [
|
|
s for s in services if (s.is_interested_in_alias(room_alias_str))
|
|
]
|
|
for alias_service in alias_query_services:
|
|
is_known_alias = await self.appservice_api.query_alias(
|
|
alias_service, room_alias_str
|
|
)
|
|
if is_known_alias:
|
|
# the alias exists now so don't query more ASes.
|
|
return await self.store.get_association_from_room_alias(room_alias)
|
|
|
|
return None
|
|
|
|
async def query_3pe(
|
|
self, kind: str, protocol: str, fields: Dict[bytes, List[bytes]]
|
|
) -> List[JsonDict]:
|
|
services = self._get_services_for_3pn(protocol)
|
|
|
|
results = await make_deferred_yieldable(
|
|
defer.DeferredList(
|
|
[
|
|
run_in_background(
|
|
self.appservice_api.query_3pe, service, kind, protocol, fields
|
|
)
|
|
for service in services
|
|
],
|
|
consumeErrors=True,
|
|
)
|
|
)
|
|
|
|
ret = []
|
|
for (success, result) in results:
|
|
if success:
|
|
ret.extend(result)
|
|
|
|
return ret
|
|
|
|
async def get_3pe_protocols(
|
|
self, only_protocol: Optional[str] = None
|
|
) -> Dict[str, JsonDict]:
|
|
services = self.store.get_app_services()
|
|
protocols: Dict[str, List[JsonDict]] = {}
|
|
|
|
# Collect up all the individual protocol responses out of the ASes
|
|
for s in services:
|
|
for p in s.protocols:
|
|
if only_protocol is not None and p != only_protocol:
|
|
continue
|
|
|
|
if p not in protocols:
|
|
protocols[p] = []
|
|
|
|
info = await self.appservice_api.get_3pe_protocol(s, p)
|
|
|
|
if info is not None:
|
|
protocols[p].append(info)
|
|
|
|
def _merge_instances(infos: List[JsonDict]) -> JsonDict:
|
|
# Merge the 'instances' lists of multiple results, but just take
|
|
# the other fields from the first as they ought to be identical
|
|
# copy the result so as not to corrupt the cached one
|
|
combined = dict(infos[0])
|
|
combined["instances"] = list(combined["instances"])
|
|
|
|
for info in infos[1:]:
|
|
combined["instances"].extend(info["instances"])
|
|
|
|
return combined
|
|
|
|
return {
|
|
p: _merge_instances(protocols[p]) for p in protocols.keys() if protocols[p]
|
|
}
|
|
|
|
async def _get_services_for_event(
|
|
self, event: EventBase
|
|
) -> List[ApplicationService]:
|
|
"""Retrieve a list of application services interested in this event.
|
|
|
|
Args:
|
|
event: The event to check. Can be None if alias_list is not.
|
|
Returns:
|
|
A list of services interested in this event based on the service regex.
|
|
"""
|
|
services = self.store.get_app_services()
|
|
|
|
# we can't use a list comprehension here. Since python 3, list
|
|
# comprehensions use a generator internally. This means you can't yield
|
|
# inside of a list comprehension anymore.
|
|
interested_list = []
|
|
for s in services:
|
|
if await s.is_interested(event, self.store):
|
|
interested_list.append(s)
|
|
|
|
return interested_list
|
|
|
|
def _get_services_for_user(self, user_id: str) -> List[ApplicationService]:
|
|
services = self.store.get_app_services()
|
|
return [s for s in services if (s.is_interested_in_user(user_id))]
|
|
|
|
def _get_services_for_3pn(self, protocol: str) -> List[ApplicationService]:
|
|
services = self.store.get_app_services()
|
|
return [s for s in services if s.is_interested_in_protocol(protocol)]
|
|
|
|
async def _is_unknown_user(self, user_id: str) -> bool:
|
|
if not self.is_mine_id(user_id):
|
|
# we don't know if they are unknown or not since it isn't one of our
|
|
# users. We can't poke ASes.
|
|
return False
|
|
|
|
user_info = await self.store.get_user_by_id(user_id)
|
|
if user_info:
|
|
return False
|
|
|
|
# user not found; could be the AS though, so check.
|
|
services = self.store.get_app_services()
|
|
service_list = [s for s in services if s.sender == user_id]
|
|
return len(service_list) == 0
|
|
|
|
async def _check_user_exists(self, user_id: str) -> bool:
|
|
unknown_user = await self._is_unknown_user(user_id)
|
|
if unknown_user:
|
|
return await self.query_user_exists(user_id)
|
|
return True
|