605 lines
22 KiB
Python
605 lines
22 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 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 six import iteritems, itervalues
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from twisted.internet import defer
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from synapse.api import errors
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from synapse.api.constants import EventTypes
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from synapse.api.errors import FederationDeniedError
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from synapse.types import RoomStreamToken, get_domain_from_id
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from synapse.util import stringutils
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from synapse.util.async_helpers import Linearizer
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from synapse.util.caches.expiringcache import ExpiringCache
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from synapse.util.metrics import measure_func
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from synapse.util.retryutils import NotRetryingDestination
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from ._base import BaseHandler
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logger = logging.getLogger(__name__)
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class DeviceHandler(BaseHandler):
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def __init__(self, hs):
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super(DeviceHandler, self).__init__(hs)
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self.hs = hs
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self.state = hs.get_state_handler()
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self._auth_handler = hs.get_auth_handler()
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self.federation_sender = hs.get_federation_sender()
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self._edu_updater = DeviceListEduUpdater(hs, self)
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federation_registry = hs.get_federation_registry()
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federation_registry.register_edu_handler(
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"m.device_list_update", self._edu_updater.incoming_device_list_update,
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)
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federation_registry.register_query_handler(
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"user_devices", self.on_federation_query_user_devices,
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)
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hs.get_distributor().observe("user_left_room", self.user_left_room)
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@defer.inlineCallbacks
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def check_device_registered(self, user_id, device_id,
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initial_device_display_name=None):
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"""
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If the given device has not been registered, register it with the
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supplied display name.
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If no device_id is supplied, we make one up.
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Args:
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user_id (str): @user:id
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device_id (str | None): device id supplied by client
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initial_device_display_name (str | None): device display name from
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client
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Returns:
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str: device id (generated if none was supplied)
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"""
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if device_id is not None:
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new_device = yield self.store.store_device(
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user_id=user_id,
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device_id=device_id,
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initial_device_display_name=initial_device_display_name,
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)
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if new_device:
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yield self.notify_device_update(user_id, [device_id])
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defer.returnValue(device_id)
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# if the device id is not specified, we'll autogen one, but loop a few
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# times in case of a clash.
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attempts = 0
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while attempts < 5:
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device_id = stringutils.random_string(10).upper()
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new_device = yield self.store.store_device(
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user_id=user_id,
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device_id=device_id,
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initial_device_display_name=initial_device_display_name,
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)
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if new_device:
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yield self.notify_device_update(user_id, [device_id])
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defer.returnValue(device_id)
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attempts += 1
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raise errors.StoreError(500, "Couldn't generate a device ID.")
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@defer.inlineCallbacks
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def get_devices_by_user(self, user_id):
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"""
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Retrieve the given user's devices
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Args:
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user_id (str):
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Returns:
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defer.Deferred: list[dict[str, X]]: info on each device
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"""
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device_map = yield self.store.get_devices_by_user(user_id)
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ips = yield self.store.get_last_client_ip_by_device(
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user_id, device_id=None
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)
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devices = list(device_map.values())
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for device in devices:
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_update_device_from_client_ips(device, ips)
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defer.returnValue(devices)
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@defer.inlineCallbacks
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def get_device(self, user_id, device_id):
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""" Retrieve the given device
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Args:
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user_id (str):
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device_id (str):
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Returns:
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defer.Deferred: dict[str, X]: info on the device
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Raises:
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errors.NotFoundError: if the device was not found
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"""
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try:
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device = yield self.store.get_device(user_id, device_id)
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except errors.StoreError:
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raise errors.NotFoundError
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ips = yield self.store.get_last_client_ip_by_device(
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user_id, device_id,
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)
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_update_device_from_client_ips(device, ips)
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defer.returnValue(device)
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@defer.inlineCallbacks
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def delete_device(self, user_id, device_id):
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""" Delete the given device
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Args:
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user_id (str):
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device_id (str):
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Returns:
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defer.Deferred:
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"""
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try:
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yield self.store.delete_device(user_id, device_id)
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except errors.StoreError as e:
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if e.code == 404:
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# no match
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pass
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else:
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raise
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yield self._auth_handler.delete_access_tokens_for_user(
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user_id, device_id=device_id,
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)
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yield self.store.delete_e2e_keys_by_device(
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user_id=user_id, device_id=device_id
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)
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yield self.notify_device_update(user_id, [device_id])
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@defer.inlineCallbacks
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def delete_all_devices_for_user(self, user_id, except_device_id=None):
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"""Delete all of the user's devices
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Args:
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user_id (str):
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except_device_id (str|None): optional device id which should not
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be deleted
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Returns:
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defer.Deferred:
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"""
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device_map = yield self.store.get_devices_by_user(user_id)
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device_ids = list(device_map)
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if except_device_id is not None:
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device_ids = [d for d in device_ids if d != except_device_id]
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yield self.delete_devices(user_id, device_ids)
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@defer.inlineCallbacks
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def delete_devices(self, user_id, device_ids):
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""" Delete several devices
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Args:
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user_id (str):
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device_ids (List[str]): The list of device IDs to delete
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Returns:
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defer.Deferred:
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"""
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try:
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yield self.store.delete_devices(user_id, device_ids)
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except errors.StoreError as e:
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if e.code == 404:
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# no match
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pass
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else:
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raise
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# Delete access tokens and e2e keys for each device. Not optimised as it is not
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# considered as part of a critical path.
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for device_id in device_ids:
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yield self._auth_handler.delete_access_tokens_for_user(
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user_id, device_id=device_id,
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)
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yield self.store.delete_e2e_keys_by_device(
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user_id=user_id, device_id=device_id
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)
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yield self.notify_device_update(user_id, device_ids)
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@defer.inlineCallbacks
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def update_device(self, user_id, device_id, content):
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""" Update the given device
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Args:
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user_id (str):
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device_id (str):
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content (dict): body of update request
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Returns:
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defer.Deferred:
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"""
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try:
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yield self.store.update_device(
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user_id,
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device_id,
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new_display_name=content.get("display_name")
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)
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yield self.notify_device_update(user_id, [device_id])
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except errors.StoreError as e:
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if e.code == 404:
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raise errors.NotFoundError()
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else:
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raise
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@measure_func("notify_device_update")
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@defer.inlineCallbacks
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def notify_device_update(self, user_id, device_ids):
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"""Notify that a user's device(s) has changed. Pokes the notifier, and
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remote servers if the user is local.
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"""
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users_who_share_room = yield self.store.get_users_who_share_room_with_user(
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user_id
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)
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hosts = set()
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if self.hs.is_mine_id(user_id):
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hosts.update(get_domain_from_id(u) for u in users_who_share_room)
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hosts.discard(self.server_name)
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position = yield self.store.add_device_change_to_streams(
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user_id, device_ids, list(hosts)
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)
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room_ids = yield self.store.get_rooms_for_user(user_id)
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yield self.notifier.on_new_event(
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"device_list_key", position, rooms=room_ids,
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)
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if hosts:
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logger.info("Sending device list update notif to: %r", hosts)
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for host in hosts:
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self.federation_sender.send_device_messages(host)
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@measure_func("device.get_user_ids_changed")
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@defer.inlineCallbacks
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def get_user_ids_changed(self, user_id, from_token):
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"""Get list of users that have had the devices updated, or have newly
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joined a room, that `user_id` may be interested in.
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Args:
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user_id (str)
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from_token (StreamToken)
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"""
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now_token = yield self.hs.get_event_sources().get_current_token()
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room_ids = yield self.store.get_rooms_for_user(user_id)
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# First we check if any devices have changed
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changed = yield self.store.get_user_whose_devices_changed(
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from_token.device_list_key
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)
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# Then work out if any users have since joined
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rooms_changed = self.store.get_rooms_that_changed(room_ids, from_token.room_key)
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member_events = yield self.store.get_membership_changes_for_user(
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user_id, from_token.room_key, now_token.room_key
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)
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rooms_changed.update(event.room_id for event in member_events)
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stream_ordering = RoomStreamToken.parse_stream_token(
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from_token.room_key
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).stream
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possibly_changed = set(changed)
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possibly_left = set()
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for room_id in rooms_changed:
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current_state_ids = yield self.store.get_current_state_ids(room_id)
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# The user may have left the room
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# TODO: Check if they actually did or if we were just invited.
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if room_id not in room_ids:
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for key, event_id in iteritems(current_state_ids):
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etype, state_key = key
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if etype != EventTypes.Member:
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continue
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possibly_left.add(state_key)
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continue
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# Fetch the current state at the time.
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try:
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event_ids = yield self.store.get_forward_extremeties_for_room(
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room_id, stream_ordering=stream_ordering
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)
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except errors.StoreError:
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# we have purged the stream_ordering index since the stream
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# ordering: treat it the same as a new room
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event_ids = []
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# special-case for an empty prev state: include all members
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# in the changed list
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if not event_ids:
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for key, event_id in iteritems(current_state_ids):
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etype, state_key = key
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if etype != EventTypes.Member:
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continue
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possibly_changed.add(state_key)
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continue
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current_member_id = current_state_ids.get((EventTypes.Member, user_id))
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if not current_member_id:
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continue
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# mapping from event_id -> state_dict
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prev_state_ids = yield self.store.get_state_ids_for_events(event_ids)
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# Check if we've joined the room? If so we just blindly add all the users to
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# the "possibly changed" users.
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for state_dict in itervalues(prev_state_ids):
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member_event = state_dict.get((EventTypes.Member, user_id), None)
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if not member_event or member_event != current_member_id:
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for key, event_id in iteritems(current_state_ids):
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etype, state_key = key
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if etype != EventTypes.Member:
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continue
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possibly_changed.add(state_key)
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break
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# If there has been any change in membership, include them in the
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# possibly changed list. We'll check if they are joined below,
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# and we're not toooo worried about spuriously adding users.
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for key, event_id in iteritems(current_state_ids):
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etype, state_key = key
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if etype != EventTypes.Member:
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continue
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# check if this member has changed since any of the extremities
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# at the stream_ordering, and add them to the list if so.
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for state_dict in itervalues(prev_state_ids):
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prev_event_id = state_dict.get(key, None)
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if not prev_event_id or prev_event_id != event_id:
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if state_key != user_id:
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possibly_changed.add(state_key)
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break
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if possibly_changed or possibly_left:
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users_who_share_room = yield self.store.get_users_who_share_room_with_user(
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user_id
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)
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# Take the intersection of the users whose devices may have changed
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# and those that actually still share a room with the user
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possibly_joined = possibly_changed & users_who_share_room
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possibly_left = (possibly_changed | possibly_left) - users_who_share_room
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else:
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possibly_joined = []
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possibly_left = []
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defer.returnValue({
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"changed": list(possibly_joined),
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"left": list(possibly_left),
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})
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@defer.inlineCallbacks
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def on_federation_query_user_devices(self, user_id):
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stream_id, devices = yield self.store.get_devices_with_keys_by_user(user_id)
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defer.returnValue({
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"user_id": user_id,
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"stream_id": stream_id,
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"devices": devices,
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})
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@defer.inlineCallbacks
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def user_left_room(self, user, room_id):
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user_id = user.to_string()
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room_ids = yield self.store.get_rooms_for_user(user_id)
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if not room_ids:
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# We no longer share rooms with this user, so we'll no longer
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# receive device updates. Mark this in DB.
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yield self.store.mark_remote_user_device_list_as_unsubscribed(user_id)
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def _update_device_from_client_ips(device, client_ips):
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ip = client_ips.get((device["user_id"], device["device_id"]), {})
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device.update({
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"last_seen_ts": ip.get("last_seen"),
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"last_seen_ip": ip.get("ip"),
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})
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class DeviceListEduUpdater(object):
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"Handles incoming device list updates from federation and updates the DB"
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def __init__(self, hs, device_handler):
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self.store = hs.get_datastore()
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self.federation = hs.get_federation_client()
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self.clock = hs.get_clock()
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self.device_handler = device_handler
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self._remote_edu_linearizer = Linearizer(name="remote_device_list")
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# user_id -> list of updates waiting to be handled.
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self._pending_updates = {}
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# Recently seen stream ids. We don't bother keeping these in the DB,
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# but they're useful to have them about to reduce the number of spurious
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# resyncs.
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self._seen_updates = ExpiringCache(
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cache_name="device_update_edu",
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clock=self.clock,
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max_len=10000,
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expiry_ms=30 * 60 * 1000,
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iterable=True,
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)
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@defer.inlineCallbacks
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def incoming_device_list_update(self, origin, edu_content):
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"""Called on incoming device list update from federation. Responsible
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for parsing the EDU and adding to pending updates list.
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"""
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user_id = edu_content.pop("user_id")
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device_id = edu_content.pop("device_id")
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stream_id = str(edu_content.pop("stream_id")) # They may come as ints
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prev_ids = edu_content.pop("prev_id", [])
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prev_ids = [str(p) for p in prev_ids] # They may come as ints
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if get_domain_from_id(user_id) != origin:
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# TODO: Raise?
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logger.warning("Got device list update edu for %r from %r", user_id, origin)
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return
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room_ids = yield self.store.get_rooms_for_user(user_id)
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if not room_ids:
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# We don't share any rooms with this user. Ignore update, as we
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# probably won't get any further updates.
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return
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self._pending_updates.setdefault(user_id, []).append(
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(device_id, stream_id, prev_ids, edu_content)
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)
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yield self._handle_device_updates(user_id)
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@measure_func("_incoming_device_list_update")
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@defer.inlineCallbacks
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def _handle_device_updates(self, user_id):
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"Actually handle pending updates."
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with (yield self._remote_edu_linearizer.queue(user_id)):
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pending_updates = self._pending_updates.pop(user_id, [])
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if not pending_updates:
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# This can happen since we batch updates
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return
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# Given a list of updates we check if we need to resync. This
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# happens if we've missed updates.
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resync = yield self._need_to_do_resync(user_id, pending_updates)
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if resync:
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# Fetch all devices for the user.
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origin = get_domain_from_id(user_id)
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try:
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result = yield self.federation.query_user_devices(origin, user_id)
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except NotRetryingDestination:
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# TODO: Remember that we are now out of sync and try again
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# later
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logger.warn(
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"Failed to handle device list update for %s,"
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" we're not retrying the remote",
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user_id,
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)
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# We abort on exceptions rather than accepting the update
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# as otherwise synapse will 'forget' that its device list
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# is out of date. If we bail then we will retry the resync
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# next time we get a device list update for this user_id.
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# This makes it more likely that the device lists will
|
|
# eventually become consistent.
|
|
return
|
|
except FederationDeniedError as e:
|
|
logger.info(e)
|
|
return
|
|
except Exception:
|
|
# TODO: Remember that we are now out of sync and try again
|
|
# later
|
|
logger.exception(
|
|
"Failed to handle device list update for %s", user_id
|
|
)
|
|
return
|
|
|
|
stream_id = result["stream_id"]
|
|
devices = result["devices"]
|
|
|
|
# If the remote server has more than ~1000 devices for this user
|
|
# we assume that something is going horribly wrong (e.g. a bot
|
|
# that logs in and creates a new device every time it tries to
|
|
# send a message). Maintaining lots of devices per user in the
|
|
# cache can cause serious performance issues as if this request
|
|
# takes more than 60s to complete, internal replication from the
|
|
# inbound federation worker to the synapse master may time out
|
|
# causing the inbound federation to fail and causing the remote
|
|
# server to retry, causing a DoS. So in this scenario we give
|
|
# up on storing the total list of devices and only handle the
|
|
# delta instead.
|
|
if len(devices) > 1000:
|
|
logger.warn(
|
|
"Ignoring device list snapshot for %s as it has >1K devs (%d)",
|
|
user_id, len(devices)
|
|
)
|
|
devices = []
|
|
|
|
yield self.store.update_remote_device_list_cache(
|
|
user_id, devices, stream_id,
|
|
)
|
|
device_ids = [device["device_id"] for device in devices]
|
|
yield self.device_handler.notify_device_update(user_id, device_ids)
|
|
else:
|
|
# Simply update the single device, since we know that is the only
|
|
# change (because of the single prev_id matching the current cache)
|
|
for device_id, stream_id, prev_ids, content in pending_updates:
|
|
yield self.store.update_remote_device_list_cache_entry(
|
|
user_id, device_id, content, stream_id,
|
|
)
|
|
|
|
yield self.device_handler.notify_device_update(
|
|
user_id, [device_id for device_id, _, _, _ in pending_updates]
|
|
)
|
|
|
|
self._seen_updates.setdefault(user_id, set()).update(
|
|
stream_id for _, stream_id, _, _ in pending_updates
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def _need_to_do_resync(self, user_id, updates):
|
|
"""Given a list of updates for a user figure out if we need to do a full
|
|
resync, or whether we have enough data that we can just apply the delta.
|
|
"""
|
|
seen_updates = self._seen_updates.get(user_id, set())
|
|
|
|
extremity = yield self.store.get_device_list_last_stream_id_for_remote(
|
|
user_id
|
|
)
|
|
|
|
stream_id_in_updates = set() # stream_ids in updates list
|
|
for _, stream_id, prev_ids, _ in updates:
|
|
if not prev_ids:
|
|
# We always do a resync if there are no previous IDs
|
|
defer.returnValue(True)
|
|
|
|
for prev_id in prev_ids:
|
|
if prev_id == extremity:
|
|
continue
|
|
elif prev_id in seen_updates:
|
|
continue
|
|
elif prev_id in stream_id_in_updates:
|
|
continue
|
|
else:
|
|
defer.returnValue(True)
|
|
|
|
stream_id_in_updates.add(stream_id)
|
|
|
|
defer.returnValue(False)
|