forked-synapse/synapse/handlers/device.py

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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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import logging
from six import iteritems, itervalues
from twisted.internet import defer
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from synapse.api import errors
from synapse.api.constants import EventTypes
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from synapse.api.errors import (
FederationDeniedError,
HttpResponseException,
RequestSendFailed,
)
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from synapse.types import RoomStreamToken, get_domain_from_id
from synapse.util import stringutils
from synapse.util.async_helpers import Linearizer
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
logger = logging.getLogger(__name__)
class DeviceHandler(BaseHandler):
def __init__(self, hs):
super(DeviceHandler, self).__init__(hs)
self.hs = hs
self.state = hs.get_state_handler()
self._auth_handler = hs.get_auth_handler()
self.federation_sender = hs.get_federation_sender()
self._edu_updater = DeviceListEduUpdater(hs, self)
federation_registry = hs.get_federation_registry()
federation_registry.register_edu_handler(
"m.device_list_update", self._edu_updater.incoming_device_list_update,
)
federation_registry.register_query_handler(
"user_devices", self.on_federation_query_user_devices,
)
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hs.get_distributor().observe("user_left_room", self.user_left_room)
@defer.inlineCallbacks
def check_device_registered(self, user_id, device_id,
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initial_device_display_name=None):
"""
If the given device has not been registered, register it with the
supplied display name.
If no device_id is supplied, we make one up.
Args:
user_id (str): @user:id
device_id (str | None): device id supplied by client
initial_device_display_name (str | None): device display name from
client
Returns:
str: device id (generated if none was supplied)
"""
if device_id is not None:
new_device = yield self.store.store_device(
user_id=user_id,
device_id=device_id,
initial_device_display_name=initial_device_display_name,
)
if new_device:
yield self.notify_device_update(user_id, [device_id])
defer.returnValue(device_id)
# if the device id is not specified, we'll autogen one, but loop a few
# times in case of a clash.
attempts = 0
while attempts < 5:
device_id = stringutils.random_string(10).upper()
new_device = yield self.store.store_device(
user_id=user_id,
device_id=device_id,
initial_device_display_name=initial_device_display_name,
)
if new_device:
yield self.notify_device_update(user_id, [device_id])
defer.returnValue(device_id)
attempts += 1
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raise errors.StoreError(500, "Couldn't generate a device ID.")
@defer.inlineCallbacks
def get_devices_by_user(self, user_id):
"""
Retrieve the given user's devices
Args:
user_id (str):
Returns:
defer.Deferred: list[dict[str, X]]: info on each device
"""
device_map = yield self.store.get_devices_by_user(user_id)
ips = yield self.store.get_last_client_ip_by_device(
user_id, device_id=None
)
devices = list(device_map.values())
for device in devices:
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_update_device_from_client_ips(device, ips)
defer.returnValue(devices)
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@defer.inlineCallbacks
def get_device(self, user_id, device_id):
""" Retrieve the given device
Args:
user_id (str):
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device_id (str):
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Returns:
defer.Deferred: dict[str, X]: info on the device
Raises:
errors.NotFoundError: if the device was not found
"""
try:
device = yield self.store.get_device(user_id, device_id)
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except errors.StoreError:
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raise errors.NotFoundError
ips = yield self.store.get_last_client_ip_by_device(
user_id, device_id,
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)
_update_device_from_client_ips(device, ips)
defer.returnValue(device)
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@defer.inlineCallbacks
def delete_device(self, user_id, device_id):
""" Delete the given device
Args:
user_id (str):
device_id (str):
Returns:
defer.Deferred:
"""
try:
yield self.store.delete_device(user_id, device_id)
except errors.StoreError as e:
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if e.code == 404:
# no match
pass
else:
raise
yield self._auth_handler.delete_access_tokens_for_user(
user_id, device_id=device_id,
)
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yield self.store.delete_e2e_keys_by_device(
user_id=user_id, device_id=device_id
)
yield self.notify_device_update(user_id, [device_id])
@defer.inlineCallbacks
def delete_all_devices_for_user(self, user_id, except_device_id=None):
"""Delete all of the user's devices
Args:
user_id (str):
except_device_id (str|None): optional device id which should not
be deleted
Returns:
defer.Deferred:
"""
device_map = yield self.store.get_devices_by_user(user_id)
device_ids = list(device_map)
if except_device_id is not None:
device_ids = [d for d in device_ids if d != except_device_id]
yield self.delete_devices(user_id, device_ids)
@defer.inlineCallbacks
def delete_devices(self, user_id, device_ids):
""" Delete several devices
Args:
user_id (str):
device_ids (List[str]): The list of device IDs to delete
Returns:
defer.Deferred:
"""
try:
yield self.store.delete_devices(user_id, device_ids)
except errors.StoreError as e:
if e.code == 404:
# no match
pass
else:
raise
# Delete access tokens and e2e keys for each device. Not optimised as it is not
# considered as part of a critical path.
for device_id in device_ids:
yield self._auth_handler.delete_access_tokens_for_user(
user_id, device_id=device_id,
)
yield self.store.delete_e2e_keys_by_device(
user_id=user_id, device_id=device_id
)
yield self.notify_device_update(user_id, device_ids)
@defer.inlineCallbacks
def update_device(self, user_id, device_id, content):
""" Update the given device
Args:
user_id (str):
device_id (str):
content (dict): body of update request
Returns:
defer.Deferred:
"""
try:
yield self.store.update_device(
user_id,
device_id,
new_display_name=content.get("display_name")
)
yield self.notify_device_update(user_id, [device_id])
except errors.StoreError as e:
if e.code == 404:
raise errors.NotFoundError()
else:
raise
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@measure_func("notify_device_update")
@defer.inlineCallbacks
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
remote servers if the user is local.
"""
users_who_share_room = yield self.store.get_users_who_share_room_with_user(
user_id
)
hosts = set()
if self.hs.is_mine_id(user_id):
hosts.update(get_domain_from_id(u) for u in users_who_share_room)
hosts.discard(self.server_name)
position = yield self.store.add_device_change_to_streams(
user_id, device_ids, list(hosts)
)
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room_ids = yield self.store.get_rooms_for_user(user_id)
yield self.notifier.on_new_event(
"device_list_key", position, rooms=room_ids,
)
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if hosts:
logger.info("Sending device list update notif to: %r", hosts)
for host in hosts:
self.federation_sender.send_device_messages(host)
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@measure_func("device.get_user_ids_changed")
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@defer.inlineCallbacks
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
joined a room, that `user_id` may be interested in.
Args:
user_id (str)
from_token (StreamToken)
"""
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(
from_token.device_list_key
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)
# Then work out if any users have since joined
rooms_changed = self.store.get_rooms_that_changed(room_ids, from_token.room_key)
member_events = yield self.store.get_membership_changes_for_user(
user_id, from_token.room_key, now_token.room_key
)
rooms_changed.update(event.room_id for event in member_events)
stream_ordering = RoomStreamToken.parse_stream_token(
from_token.room_key
).stream
possibly_changed = set(changed)
possibly_left = set()
for room_id in rooms_changed:
current_state_ids = yield self.store.get_current_state_ids(room_id)
# The user may have left the room
# TODO: Check if they actually did or if we were just invited.
if room_id not in room_ids:
for key, event_id in iteritems(current_state_ids):
etype, state_key = key
if etype != EventTypes.Member:
continue
possibly_left.add(state_key)
continue
# Fetch the current state at the time.
try:
event_ids = yield self.store.get_forward_extremeties_for_room(
room_id, stream_ordering=stream_ordering
)
except errors.StoreError:
# we have purged the stream_ordering index since the stream
# ordering: treat it the same as a new room
event_ids = []
# special-case for an empty prev state: include all members
# in the changed list
if not event_ids:
for key, event_id in iteritems(current_state_ids):
etype, state_key = key
if etype != EventTypes.Member:
continue
possibly_changed.add(state_key)
continue
current_member_id = current_state_ids.get((EventTypes.Member, user_id))
if not current_member_id:
continue
# mapping from event_id -> state_dict
prev_state_ids = yield self.store.get_state_ids_for_events(event_ids)
# Check if we've joined the room? If so we just blindly add all the users to
# the "possibly changed" users.
for state_dict in itervalues(prev_state_ids):
member_event = state_dict.get((EventTypes.Member, user_id), None)
if not member_event or member_event != current_member_id:
for key, event_id in iteritems(current_state_ids):
etype, state_key = key
if etype != EventTypes.Member:
continue
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possibly_changed.add(state_key)
break
# If there has been any change in membership, include them in the
# possibly changed list. We'll check if they are joined below,
# and we're not toooo worried about spuriously adding users.
for key, event_id in iteritems(current_state_ids):
etype, state_key = key
if etype != EventTypes.Member:
continue
# check if this member has changed since any of the extremities
# at the stream_ordering, and add them to the list if so.
for state_dict in itervalues(prev_state_ids):
prev_event_id = state_dict.get(key, None)
if not prev_event_id or prev_event_id != event_id:
if state_key != user_id:
possibly_changed.add(state_key)
break
if possibly_changed or possibly_left:
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users_who_share_room = yield self.store.get_users_who_share_room_with_user(
user_id
)
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# Take the intersection of the users whose devices may have changed
# and those that actually still share a room with the user
possibly_joined = possibly_changed & users_who_share_room
possibly_left = (possibly_changed | possibly_left) - users_who_share_room
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else:
possibly_joined = []
possibly_left = []
defer.returnValue({
"changed": list(possibly_joined),
"left": list(possibly_left),
})
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@defer.inlineCallbacks
def on_federation_query_user_devices(self, user_id):
stream_id, devices = yield self.store.get_devices_with_keys_by_user(user_id)
defer.returnValue({
"user_id": user_id,
"stream_id": stream_id,
"devices": devices,
})
@defer.inlineCallbacks
def user_left_room(self, user, room_id):
user_id = user.to_string()
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room_ids = yield self.store.get_rooms_for_user(user_id)
if not room_ids:
# We no longer share rooms with this user, so we'll no longer
# receive device updates. Mark this in DB.
yield self.store.mark_remote_user_device_list_as_unsubscribed(user_id)
def _update_device_from_client_ips(device, client_ips):
ip = client_ips.get((device["user_id"], device["device_id"]), {})
device.update({
"last_seen_ts": ip.get("last_seen"),
"last_seen_ip": ip.get("ip"),
})
class DeviceListEduUpdater(object):
"Handles incoming device list updates from federation and updates the DB"
def __init__(self, hs, device_handler):
self.store = hs.get_datastore()
self.federation = hs.get_federation_client()
self.clock = hs.get_clock()
self.device_handler = device_handler
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self._remote_edu_linearizer = Linearizer(name="remote_device_list")
# user_id -> list of updates waiting to be handled.
self._pending_updates = {}
# Recently seen stream ids. We don't bother keeping these in the DB,
# but they're useful to have them about to reduce the number of spurious
# resyncs.
self._seen_updates = ExpiringCache(
cache_name="device_update_edu",
clock=self.clock,
max_len=10000,
expiry_ms=30 * 60 * 1000,
iterable=True,
)
@defer.inlineCallbacks
def incoming_device_list_update(self, origin, edu_content):
"""Called on incoming device list update from federation. Responsible
for parsing the EDU and adding to pending updates list.
"""
user_id = edu_content.pop("user_id")
device_id = edu_content.pop("device_id")
stream_id = str(edu_content.pop("stream_id")) # They may come as ints
prev_ids = edu_content.pop("prev_id", [])
prev_ids = [str(p) for p in prev_ids] # They may come as ints
if get_domain_from_id(user_id) != origin:
# TODO: Raise?
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logger.warning("Got device list update edu for %r from %r", user_id, origin)
return
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room_ids = yield self.store.get_rooms_for_user(user_id)
if not room_ids:
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# We don't share any rooms with this user. Ignore update, as we
# probably won't get any further updates.
return
self._pending_updates.setdefault(user_id, []).append(
(device_id, stream_id, prev_ids, edu_content)
)
yield self._handle_device_updates(user_id)
@measure_func("_incoming_device_list_update")
@defer.inlineCallbacks
def _handle_device_updates(self, user_id):
"Actually handle pending updates."
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with (yield self._remote_edu_linearizer.queue(user_id)):
pending_updates = self._pending_updates.pop(user_id, [])
if not pending_updates:
# This can happen since we batch updates
return
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# Given a list of updates we check if we need to resync. This
# happens if we've missed updates.
resync = yield self._need_to_do_resync(user_id, pending_updates)
if resync:
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# Fetch all devices for the user.
origin = get_domain_from_id(user_id)
try:
result = yield self.federation.query_user_devices(origin, user_id)
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except (
NotRetryingDestination, RequestSendFailed, HttpResponseException,
):
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# TODO: Remember that we are now out of sync and try again
# later
logger.warn(
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"Failed to handle device list update for %s", user_id,
)
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# We abort on exceptions rather than accepting the update
# as otherwise synapse will 'forget' that its device list
# is out of date. If we bail then we will retry the resync
# next time we get a device list update for this user_id.
# This makes it more likely that the device lists will
# eventually become consistent.
return
except FederationDeniedError as e:
logger.info(e)
return
except Exception:
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# 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:
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# Simply update the single device, since we know that is the only
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# 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
)
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@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())
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extremity = yield self.store.get_device_list_last_stream_id_for_remote(
user_id
)
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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)