mirror of
https://mau.dev/maunium/synapse.git
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c897ac63e9
... when workers are unreachable, etc. Fixes https://github.com/element-hq/synapse/issues/17117. The general principle is just to make sure that we propagate any exceptions to the JsonResource, so that we return an error code to the sending server. That means that the sending server no longer considers the message safely sent, so it will retry later. In the issue, Erik mentions that an alternative solution would be to persist the to-device messages into a table so that they can be retried. This might be an improvement for performance, but even if we did that, we still need this mechanism, since we might be unable to reach the database. So, if we want to do that, it can be a later follow-up. --------- Co-authored-by: Erik Johnston <erik@matrix.org>
405 lines
15 KiB
Python
405 lines
15 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright 2016 OpenMarket Ltd
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import logging
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from http import HTTPStatus
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from typing import TYPE_CHECKING, Any, Dict, Optional
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from synapse.api.constants import EduTypes, EventContentFields, ToDeviceEventTypes
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from synapse.api.errors import Codes, SynapseError
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from synapse.api.ratelimiting import Ratelimiter
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from synapse.logging.context import run_in_background
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from synapse.logging.opentracing import (
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SynapseTags,
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get_active_span_text_map,
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log_kv,
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set_tag,
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)
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from synapse.replication.http.devices import (
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ReplicationMultiUserDevicesResyncRestServlet,
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)
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from synapse.types import JsonDict, Requester, StreamKeyType, UserID, get_domain_from_id
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from synapse.util import json_encoder
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from synapse.util.stringutils import random_string
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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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class DeviceMessageHandler:
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def __init__(self, hs: "HomeServer"):
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"""
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Args:
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hs: server
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"""
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self.store = hs.get_datastores().main
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self.notifier = hs.get_notifier()
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self.is_mine = hs.is_mine
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if hs.config.experimental.msc3814_enabled:
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self.event_sources = hs.get_event_sources()
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self.device_handler = hs.get_device_handler()
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# We only need to poke the federation sender explicitly if its on the
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# same instance. Other federation sender instances will get notified by
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# `synapse.app.generic_worker.FederationSenderHandler` when it sees it
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# in the to-device replication stream.
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self.federation_sender = None
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if hs.should_send_federation():
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self.federation_sender = hs.get_federation_sender()
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# If we can handle the to device EDUs we do so, otherwise we route them
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# to the appropriate worker.
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if hs.get_instance_name() in hs.config.worker.writers.to_device:
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hs.get_federation_registry().register_edu_handler(
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EduTypes.DIRECT_TO_DEVICE, self.on_direct_to_device_edu
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)
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else:
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hs.get_federation_registry().register_instances_for_edu(
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EduTypes.DIRECT_TO_DEVICE,
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hs.config.worker.writers.to_device,
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)
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# The handler to call when we think a user's device list might be out of
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# sync. We do all device list resyncing on the master instance, so if
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# we're on a worker we hit the device resync replication API.
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if hs.config.worker.worker_app is None:
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self._multi_user_device_resync = (
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hs.get_device_handler().device_list_updater.multi_user_device_resync
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)
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else:
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self._multi_user_device_resync = (
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ReplicationMultiUserDevicesResyncRestServlet.make_client(hs)
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)
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# a rate limiter for room key requests. The keys are
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# (sending_user_id, sending_device_id).
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self._ratelimiter = Ratelimiter(
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store=self.store,
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clock=hs.get_clock(),
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cfg=hs.config.ratelimiting.rc_key_requests,
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)
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async def on_direct_to_device_edu(self, origin: str, content: JsonDict) -> None:
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"""
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Handle receiving to-device messages from remote homeservers.
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Note that any errors thrown from this method will cause the federation /send
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request to receive an error response.
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Args:
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origin: The remote homeserver.
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content: The JSON dictionary containing the to-device messages.
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"""
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local_messages = {}
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sender_user_id = content["sender"]
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if origin != get_domain_from_id(sender_user_id):
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logger.warning(
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"Dropping device message from %r with spoofed sender %r",
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origin,
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sender_user_id,
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)
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message_type = content["type"]
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message_id = content["message_id"]
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for user_id, by_device in content["messages"].items():
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# we use UserID.from_string to catch invalid user ids
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if not self.is_mine(UserID.from_string(user_id)):
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logger.warning("To-device message to non-local user %s", user_id)
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raise SynapseError(400, "Not a user here")
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if not by_device:
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continue
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# Ratelimit key requests by the sending user.
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if message_type == ToDeviceEventTypes.RoomKeyRequest:
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allowed, _ = await self._ratelimiter.can_do_action(
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None, (sender_user_id, None)
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)
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if not allowed:
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logger.info(
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"Dropping room_key_request from %s to %s due to rate limit",
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sender_user_id,
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user_id,
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)
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continue
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messages_by_device = {
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device_id: {
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"content": message_content,
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"type": message_type,
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"sender": sender_user_id,
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}
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for device_id, message_content in by_device.items()
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}
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local_messages[user_id] = messages_by_device
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await self._check_for_unknown_devices(
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message_type, sender_user_id, by_device
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)
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# Add messages to the database.
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# Retrieve the stream id of the last-processed to-device message.
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last_stream_id = await self.store.add_messages_from_remote_to_device_inbox(
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origin, message_id, local_messages
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)
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# Notify listeners that there are new to-device messages to process,
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# handing them the latest stream id.
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self.notifier.on_new_event(
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StreamKeyType.TO_DEVICE, last_stream_id, users=local_messages.keys()
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)
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async def _check_for_unknown_devices(
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self,
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message_type: str,
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sender_user_id: str,
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by_device: Dict[str, Dict[str, Any]],
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) -> None:
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"""Checks inbound device messages for unknown remote devices, and if
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found marks the remote cache for the user as stale.
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"""
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if message_type != "m.room_key_request":
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return
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# Get the sending device IDs
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requesting_device_ids = set()
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for message_content in by_device.values():
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device_id = message_content.get("requesting_device_id")
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requesting_device_ids.add(device_id)
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# Check if we are tracking the devices of the remote user.
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room_ids = await self.store.get_rooms_for_user(sender_user_id)
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if not room_ids:
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logger.info(
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"Received device message from remote device we don't"
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" share a room with: %s %s",
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sender_user_id,
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requesting_device_ids,
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)
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return
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# If we are tracking check that we know about the sending
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# devices.
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cached_devices = await self.store.get_cached_devices_for_user(sender_user_id)
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unknown_devices = requesting_device_ids - set(cached_devices)
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if unknown_devices:
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logger.info(
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"Received device message from remote device not in our cache: %s %s",
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sender_user_id,
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unknown_devices,
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)
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await self.store.mark_remote_users_device_caches_as_stale((sender_user_id,))
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# Immediately attempt a resync in the background
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run_in_background(self._multi_user_device_resync, user_ids=[sender_user_id])
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async def send_device_message(
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self,
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requester: Requester,
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message_type: str,
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messages: Dict[str, Dict[str, JsonDict]],
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) -> None:
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"""
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Handle a request from a user to send to-device message(s).
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Args:
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requester: The user that is sending the to-device messages.
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message_type: The type of to-device messages that are being sent.
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messages: A dictionary containing recipients mapped to messages intended for them.
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"""
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sender_user_id = requester.user.to_string()
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set_tag(SynapseTags.TO_DEVICE_TYPE, message_type)
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set_tag(SynapseTags.TO_DEVICE_SENDER, sender_user_id)
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local_messages = {}
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remote_messages: Dict[str, Dict[str, Dict[str, JsonDict]]] = {}
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for user_id, by_device in messages.items():
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# add an opentracing log entry for each message
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for device_id, message_content in by_device.items():
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log_kv(
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{
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"event": "send_to_device_message",
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"user_id": user_id,
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"device_id": device_id,
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EventContentFields.TO_DEVICE_MSGID: message_content.get(
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EventContentFields.TO_DEVICE_MSGID
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),
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}
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)
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# Ratelimit local cross-user key requests by the sending device.
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if (
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message_type == ToDeviceEventTypes.RoomKeyRequest
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and user_id != sender_user_id
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):
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allowed, _ = await self._ratelimiter.can_do_action(
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requester, (sender_user_id, requester.device_id)
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)
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if not allowed:
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log_kv({"message": f"dropping key requests to {user_id}"})
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logger.info(
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"Dropping room_key_request from %s to %s due to rate limit",
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sender_user_id,
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user_id,
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)
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continue
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# we use UserID.from_string to catch invalid user ids
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if self.is_mine(UserID.from_string(user_id)):
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messages_by_device = {
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device_id: {
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"content": message_content,
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"type": message_type,
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"sender": sender_user_id,
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}
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for device_id, message_content in by_device.items()
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}
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if messages_by_device:
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local_messages[user_id] = messages_by_device
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else:
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destination = get_domain_from_id(user_id)
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remote_messages.setdefault(destination, {})[user_id] = by_device
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context = get_active_span_text_map()
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remote_edu_contents = {}
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for destination, messages in remote_messages.items():
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# The EDU contains a "message_id" property which is used for
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# idempotence. Make up a random one.
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message_id = random_string(16)
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log_kv({"destination": destination, "message_id": message_id})
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remote_edu_contents[destination] = {
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"messages": messages,
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"sender": sender_user_id,
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"type": message_type,
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"message_id": message_id,
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"org.matrix.opentracing_context": json_encoder.encode(context),
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}
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# Add messages to the database.
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# Retrieve the stream id of the last-processed to-device message.
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last_stream_id = await self.store.add_messages_to_device_inbox(
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local_messages, remote_edu_contents
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)
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# Notify listeners that there are new to-device messages to process,
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# handing them the latest stream id.
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self.notifier.on_new_event(
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StreamKeyType.TO_DEVICE, last_stream_id, users=local_messages.keys()
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)
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if self.federation_sender:
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# Enqueue a new federation transaction to send the new
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# device messages to each remote destination.
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await self.federation_sender.send_device_messages(remote_messages.keys())
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async def get_events_for_dehydrated_device(
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self,
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requester: Requester,
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device_id: str,
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since_token: Optional[str],
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limit: int,
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) -> JsonDict:
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"""Fetches up to `limit` events sent to `device_id` starting from `since_token`
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and returns the new since token. If there are no more messages, returns an empty
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array.
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Args:
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requester: the user requesting the messages
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device_id: ID of the dehydrated device
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since_token: stream id to start from when fetching messages
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limit: the number of messages to fetch
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Returns:
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A dict containing the to-device messages, as well as a token that the client
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can provide in the next call to fetch the next batch of messages
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"""
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user_id = requester.user.to_string()
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# only allow fetching messages for the dehydrated device id currently associated
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# with the user
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dehydrated_device = await self.device_handler.get_dehydrated_device(user_id)
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if dehydrated_device is None:
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raise SynapseError(
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HTTPStatus.FORBIDDEN,
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"No dehydrated device exists",
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Codes.FORBIDDEN,
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)
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dehydrated_device_id, _ = dehydrated_device
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if device_id != dehydrated_device_id:
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raise SynapseError(
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HTTPStatus.FORBIDDEN,
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"You may only fetch messages for your dehydrated device",
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Codes.FORBIDDEN,
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)
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since_stream_id = 0
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if since_token:
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if not since_token.startswith("d"):
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raise SynapseError(
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HTTPStatus.BAD_REQUEST,
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"from parameter %r has an invalid format" % (since_token,),
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errcode=Codes.INVALID_PARAM,
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)
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try:
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since_stream_id = int(since_token[1:])
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except Exception:
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raise SynapseError(
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HTTPStatus.BAD_REQUEST,
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"from parameter %r has an invalid format" % (since_token,),
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errcode=Codes.INVALID_PARAM,
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)
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to_token = self.event_sources.get_current_token().to_device_key
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messages, stream_id = await self.store.get_messages_for_device(
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user_id, device_id, since_stream_id, to_token, limit
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)
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for message in messages:
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# Remove the message id before sending to client
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message_id = message.pop("message_id", None)
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if message_id:
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set_tag(SynapseTags.TO_DEVICE_EDU_ID, message_id)
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logger.debug(
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"Returning %d to-device messages between %d and %d (current token: %d) for "
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"dehydrated device %s, user_id %s",
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len(messages),
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since_stream_id,
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stream_id,
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to_token,
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device_id,
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user_id,
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)
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return {
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"events": messages,
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"next_batch": f"d{stream_id}",
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}
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