Convert simple_update* and simple_select* to async (#8173)

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Patrick Cloke 2020-08-27 07:08:38 -04:00 committed by GitHub
parent a466b67972
commit 4a739c73b4
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19 changed files with 164 additions and 133 deletions

1
changelog.d/8173.misc Normal file
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@ -0,0 +1 @@
Convert various parts of the codebase to async/await.

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@ -51,7 +51,7 @@ from synapse.types import (
create_requester,
)
from synapse.util import stringutils
from synapse.util.async_helpers import Linearizer, maybe_awaitable
from synapse.util.async_helpers import Linearizer
from synapse.util.caches.response_cache import ResponseCache
from synapse.visibility import filter_events_for_client
@ -1329,9 +1329,7 @@ class RoomShutdownHandler(object):
ratelimit=False,
)
aliases_for_room = await maybe_awaitable(
self.store.get_aliases_for_room(room_id)
)
aliases_for_room = await self.store.get_aliases_for_room(room_id)
await self.store.update_aliases_for_room(
room_id, new_room_id, requester_user_id

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@ -1132,13 +1132,13 @@ class DatabasePool(object):
return [r[0] for r in txn]
def simple_select_onecol(
async def simple_select_onecol(
self,
table: str,
keyvalues: Optional[Dict[str, Any]],
retcol: str,
desc: str = "simple_select_onecol",
) -> defer.Deferred:
) -> List[Any]:
"""Executes a SELECT query on the named table, which returns a list
comprising of the values of the named column from the selected rows.
@ -1148,19 +1148,19 @@ class DatabasePool(object):
retcol: column whos value we wish to retrieve.
Returns:
Deferred: Results in a list
Results in a list
"""
return self.runInteraction(
return await self.runInteraction(
desc, self.simple_select_onecol_txn, table, keyvalues, retcol
)
def simple_select_list(
async def simple_select_list(
self,
table: str,
keyvalues: Optional[Dict[str, Any]],
retcols: Iterable[str],
desc: str = "simple_select_list",
) -> defer.Deferred:
) -> List[Dict[str, Any]]:
"""Executes a SELECT query on the named table, which may return zero or
more rows, returning the result as a list of dicts.
@ -1170,10 +1170,11 @@ class DatabasePool(object):
column names and values to select the rows with, or None to not
apply a WHERE clause.
retcols: the names of the columns to return
Returns:
defer.Deferred: resolves to list[dict[str, Any]]
A list of dictionaries.
"""
return self.runInteraction(
return await self.runInteraction(
desc, self.simple_select_list_txn, table, keyvalues, retcols
)
@ -1299,14 +1300,14 @@ class DatabasePool(object):
txn.execute(sql, values)
return cls.cursor_to_dict(txn)
def simple_update(
async def simple_update(
self,
table: str,
keyvalues: Dict[str, Any],
updatevalues: Dict[str, Any],
desc: str,
) -> defer.Deferred:
return self.runInteraction(
) -> int:
return await self.runInteraction(
desc, self.simple_update_txn, table, keyvalues, updatevalues
)
@ -1332,13 +1333,13 @@ class DatabasePool(object):
return txn.rowcount
def simple_update_one(
async def simple_update_one(
self,
table: str,
keyvalues: Dict[str, Any],
updatevalues: Dict[str, Any],
desc: str = "simple_update_one",
) -> defer.Deferred:
) -> None:
"""Executes an UPDATE query on the named table, setting new values for
columns in a row matching the key values.
@ -1347,7 +1348,7 @@ class DatabasePool(object):
keyvalues: dict of column names and values to select the row with
updatevalues: dict giving column names and values to update
"""
return self.runInteraction(
await self.runInteraction(
desc, self.simple_update_one_txn, table, keyvalues, updatevalues
)

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@ -18,6 +18,7 @@
import calendar
import logging
import time
from typing import Any, Dict, List
from synapse.api.constants import PresenceState
from synapse.config.homeserver import HomeServerConfig
@ -476,14 +477,13 @@ class DataStore(
"generate_user_daily_visits", _generate_user_daily_visits
)
def get_users(self):
async def get_users(self) -> List[Dict[str, Any]]:
"""Function to retrieve a list of users in users table.
Args:
Returns:
defer.Deferred: resolves to list[dict[str, Any]]
A list of dictionaries representing users.
"""
return self.db_pool.simple_select_list(
return await self.db_pool.simple_select_list(
table="users",
keyvalues={},
retcols=[

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@ -14,7 +14,7 @@
# limitations under the License.
from collections import namedtuple
from typing import Iterable, Optional
from typing import Iterable, List, Optional
from synapse.api.errors import SynapseError
from synapse.storage._base import SQLBaseStore
@ -68,8 +68,8 @@ class DirectoryWorkerStore(SQLBaseStore):
)
@cached(max_entries=5000)
def get_aliases_for_room(self, room_id):
return self.db_pool.simple_select_onecol(
async def get_aliases_for_room(self, room_id: str) -> List[str]:
return await self.db_pool.simple_select_onecol(
"room_aliases",
{"room_id": room_id},
"room_alias",

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@ -14,6 +14,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import Optional
from synapse.api.errors import StoreError
from synapse.logging.opentracing import log_kv, trace
from synapse.storage._base import SQLBaseStore, db_to_json
@ -368,18 +370,22 @@ class EndToEndRoomKeyStore(SQLBaseStore):
)
@trace
def update_e2e_room_keys_version(
self, user_id, version, info=None, version_etag=None
):
async def update_e2e_room_keys_version(
self,
user_id: str,
version: str,
info: Optional[dict] = None,
version_etag: Optional[int] = None,
) -> None:
"""Update a given backup version
Args:
user_id(str): the user whose backup version we're updating
version(str): the version ID of the backup version we're updating
info (dict): the new backup version info to store. If None, then
the backup version info is not updated
version_etag (Optional[int]): etag of the keys in the backup. If
None, then the etag is not updated
user_id: the user whose backup version we're updating
version: the version ID of the backup version we're updating
info: the new backup version info to store. If None, then the backup
version info is not updated.
version_etag: etag of the keys in the backup. If None, then the etag
is not updated.
"""
updatevalues = {}
@ -389,7 +395,7 @@ class EndToEndRoomKeyStore(SQLBaseStore):
updatevalues["etag"] = version_etag
if updatevalues:
return self.db_pool.simple_update(
await self.db_pool.simple_update(
table="e2e_room_keys_versions",
keyvalues={"user_id": user_id, "version": version},
updatevalues=updatevalues,

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@ -368,8 +368,8 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
)
@cached(max_entries=5000, iterable=True)
def get_latest_event_ids_in_room(self, room_id):
return self.db_pool.simple_select_onecol(
async def get_latest_event_ids_in_room(self, room_id: str) -> List[str]:
return await self.db_pool.simple_select_onecol(
table="event_forward_extremities",
keyvalues={"room_id": room_id},
retcol="event_id",

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@ -44,24 +44,26 @@ class GroupServerWorkerStore(SQLBaseStore):
desc="get_group",
)
def get_users_in_group(self, group_id, include_private=False):
async def get_users_in_group(
self, group_id: str, include_private: bool = False
) -> List[Dict[str, Any]]:
# TODO: Pagination
keyvalues = {"group_id": group_id}
if not include_private:
keyvalues["is_public"] = True
return self.db_pool.simple_select_list(
return await self.db_pool.simple_select_list(
table="group_users",
keyvalues=keyvalues,
retcols=("user_id", "is_public", "is_admin"),
desc="get_users_in_group",
)
def get_invited_users_in_group(self, group_id):
async def get_invited_users_in_group(self, group_id: str) -> List[str]:
# TODO: Pagination
return self.db_pool.simple_select_onecol(
return await self.db_pool.simple_select_onecol(
table="group_invites",
keyvalues={"group_id": group_id},
retcol="user_id",
@ -265,15 +267,14 @@ class GroupServerWorkerStore(SQLBaseStore):
return role
def get_local_groups_for_room(self, room_id):
async def get_local_groups_for_room(self, room_id: str) -> List[str]:
"""Get all of the local group that contain a given room
Args:
room_id (str): The ID of a room
room_id: The ID of a room
Returns:
Deferred[list[str]]: A twisted.Deferred containing a list of group ids
containing this room
A list of group ids containing this room
"""
return self.db_pool.simple_select_onecol(
return await self.db_pool.simple_select_onecol(
table="group_rooms",
keyvalues={"room_id": room_id},
retcol="group_id",
@ -422,10 +423,10 @@ class GroupServerWorkerStore(SQLBaseStore):
"get_users_membership_info_in_group", _get_users_membership_in_group_txn
)
def get_publicised_groups_for_user(self, user_id):
async def get_publicised_groups_for_user(self, user_id: str) -> List[str]:
"""Get all groups a user is publicising
"""
return self.db_pool.simple_select_onecol(
return await self.db_pool.simple_select_onecol(
table="local_group_membership",
keyvalues={"user_id": user_id, "membership": "join", "is_publicised": True},
retcol="group_id",
@ -466,8 +467,8 @@ class GroupServerWorkerStore(SQLBaseStore):
return None
def get_joined_groups(self, user_id):
return self.db_pool.simple_select_onecol(
async def get_joined_groups(self, user_id: str) -> List[str]:
return await self.db_pool.simple_select_onecol(
table="local_group_membership",
keyvalues={"user_id": user_id, "membership": "join"},
retcol="group_id",
@ -585,14 +586,14 @@ class GroupServerWorkerStore(SQLBaseStore):
class GroupServerStore(GroupServerWorkerStore):
def set_group_join_policy(self, group_id, join_policy):
async def set_group_join_policy(self, group_id: str, join_policy: str) -> None:
"""Set the join policy of a group.
join_policy can be one of:
* "invite"
* "open"
"""
return self.db_pool.simple_update_one(
await self.db_pool.simple_update_one(
table="groups",
keyvalues={"group_id": group_id},
updatevalues={"join_policy": join_policy},
@ -1050,8 +1051,10 @@ class GroupServerStore(GroupServerWorkerStore):
desc="add_room_to_group",
)
def update_room_in_group_visibility(self, group_id, room_id, is_public):
return self.db_pool.simple_update(
async def update_room_in_group_visibility(
self, group_id: str, room_id: str, is_public: bool
) -> int:
return await self.db_pool.simple_update(
table="group_rooms",
keyvalues={"group_id": group_id, "room_id": room_id},
updatevalues={"is_public": is_public},
@ -1076,10 +1079,12 @@ class GroupServerStore(GroupServerWorkerStore):
"remove_room_from_group", _remove_room_from_group_txn
)
def update_group_publicity(self, group_id, user_id, publicise):
async def update_group_publicity(
self, group_id: str, user_id: str, publicise: bool
) -> None:
"""Update whether the user is publicising their membership of the group
"""
return self.db_pool.simple_update_one(
await self.db_pool.simple_update_one(
table="local_group_membership",
keyvalues={"group_id": group_id, "user_id": user_id},
updatevalues={"is_publicised": publicise},
@ -1218,20 +1223,24 @@ class GroupServerStore(GroupServerWorkerStore):
desc="update_group_profile",
)
def update_attestation_renewal(self, group_id, user_id, attestation):
async def update_attestation_renewal(
self, group_id: str, user_id: str, attestation: dict
) -> None:
"""Update an attestation that we have renewed
"""
return self.db_pool.simple_update_one(
await self.db_pool.simple_update_one(
table="group_attestations_renewals",
keyvalues={"group_id": group_id, "user_id": user_id},
updatevalues={"valid_until_ms": attestation["valid_until_ms"]},
desc="update_attestation_renewal",
)
def update_remote_attestion(self, group_id, user_id, attestation):
async def update_remote_attestion(
self, group_id: str, user_id: str, attestation: dict
) -> None:
"""Update an attestation that a remote has renewed
"""
return self.db_pool.simple_update_one(
await self.db_pool.simple_update_one(
table="group_attestations_remote",
keyvalues={"group_id": group_id, "user_id": user_id},
updatevalues={

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@ -12,7 +12,7 @@
# 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.
from typing import Any, Dict, Optional
from typing import Any, Dict, List, Optional
from synapse.storage._base import SQLBaseStore
from synapse.storage.database import DatabasePool
@ -84,9 +84,9 @@ class MediaRepositoryStore(MediaRepositoryBackgroundUpdateStore):
desc="store_local_media",
)
def mark_local_media_as_safe(self, media_id: str):
async def mark_local_media_as_safe(self, media_id: str) -> None:
"""Mark a local media as safe from quarantining."""
return self.db_pool.simple_update_one(
await self.db_pool.simple_update_one(
table="local_media_repository",
keyvalues={"media_id": media_id},
updatevalues={"safe_from_quarantine": True},
@ -158,8 +158,8 @@ class MediaRepositoryStore(MediaRepositoryBackgroundUpdateStore):
desc="store_url_cache",
)
def get_local_media_thumbnails(self, media_id):
return self.db_pool.simple_select_list(
async def get_local_media_thumbnails(self, media_id: str) -> List[Dict[str, Any]]:
return await self.db_pool.simple_select_list(
"local_media_repository_thumbnails",
{"media_id": media_id},
(
@ -271,8 +271,10 @@ class MediaRepositoryStore(MediaRepositoryBackgroundUpdateStore):
"update_cached_last_access_time", update_cache_txn
)
def get_remote_media_thumbnails(self, origin, media_id):
return self.db_pool.simple_select_list(
async def get_remote_media_thumbnails(
self, origin: str, media_id: str
) -> List[Dict[str, Any]]:
return await self.db_pool.simple_select_list(
"remote_media_cache_thumbnails",
{"media_origin": origin, "media_id": media_id},
(

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@ -71,16 +71,20 @@ class ProfileWorkerStore(SQLBaseStore):
table="profiles", values={"user_id": user_localpart}, desc="create_profile"
)
def set_profile_displayname(self, user_localpart, new_displayname):
return self.db_pool.simple_update_one(
async def set_profile_displayname(
self, user_localpart: str, new_displayname: str
) -> None:
await self.db_pool.simple_update_one(
table="profiles",
keyvalues={"user_id": user_localpart},
updatevalues={"displayname": new_displayname},
desc="set_profile_displayname",
)
def set_profile_avatar_url(self, user_localpart, new_avatar_url):
return self.db_pool.simple_update_one(
async def set_profile_avatar_url(
self, user_localpart: str, new_avatar_url: str
) -> None:
await self.db_pool.simple_update_one(
table="profiles",
keyvalues={"user_id": user_localpart},
updatevalues={"avatar_url": new_avatar_url},
@ -106,8 +110,10 @@ class ProfileStore(ProfileWorkerStore):
desc="add_remote_profile_cache",
)
def update_remote_profile_cache(self, user_id, displayname, avatar_url):
return self.db_pool.simple_update(
async def update_remote_profile_cache(
self, user_id: str, displayname: str, avatar_url: str
) -> int:
return await self.db_pool.simple_update(
table="remote_profile_cache",
keyvalues={"user_id": user_id},
updatevalues={

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@ -16,7 +16,7 @@
import abc
import logging
from typing import List, Optional, Tuple
from typing import Any, Dict, List, Optional, Tuple
from twisted.internet import defer
@ -62,8 +62,10 @@ class ReceiptsWorkerStore(SQLBaseStore):
return {r["user_id"] for r in receipts}
@cached(num_args=2)
def get_receipts_for_room(self, room_id, receipt_type):
return self.db_pool.simple_select_list(
async def get_receipts_for_room(
self, room_id: str, receipt_type: str
) -> List[Dict[str, Any]]:
return await self.db_pool.simple_select_list(
table="receipts_linearized",
keyvalues={"room_id": room_id, "receipt_type": receipt_type},
retcols=("user_id", "event_id"),

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@ -578,20 +578,20 @@ class RegistrationWorkerStore(SQLBaseStore):
desc="add_user_bound_threepid",
)
def user_get_bound_threepids(self, user_id):
async def user_get_bound_threepids(self, user_id: str) -> List[Dict[str, Any]]:
"""Get the threepids that a user has bound to an identity server through the homeserver
The homeserver remembers where binds to an identity server occurred. Using this
method can retrieve those threepids.
Args:
user_id (str): The ID of the user to retrieve threepids for
user_id: The ID of the user to retrieve threepids for
Returns:
Deferred[list[dict]]: List of dictionaries containing the following:
List of dictionaries containing the following keys:
medium (str): The medium of the threepid (e.g "email")
address (str): The address of the threepid (e.g "bob@example.com")
"""
return self.db_pool.simple_select_list(
return await self.db_pool.simple_select_list(
table="user_threepid_id_server",
keyvalues={"user_id": user_id},
retcols=["medium", "address"],
@ -623,19 +623,21 @@ class RegistrationWorkerStore(SQLBaseStore):
desc="remove_user_bound_threepid",
)
def get_id_servers_user_bound(self, user_id, medium, address):
async def get_id_servers_user_bound(
self, user_id: str, medium: str, address: str
) -> List[str]:
"""Get the list of identity servers that the server proxied bind
requests to for given user and threepid
Args:
user_id (str)
medium (str)
address (str)
user_id: The user to query for identity servers.
medium: The medium to query for identity servers.
address: The address to query for identity servers.
Returns:
Deferred[list[str]]: Resolves to a list of identity servers
A list of identity servers
"""
return self.db_pool.simple_select_onecol(
return await self.db_pool.simple_select_onecol(
table="user_threepid_id_server",
keyvalues={"user_id": user_id, "medium": medium, "address": address},
retcol="id_server",

View file

@ -125,8 +125,8 @@ class RoomWorkerStore(SQLBaseStore):
"get_room_with_stats", get_room_with_stats_txn, room_id
)
def get_public_room_ids(self):
return self.db_pool.simple_select_onecol(
async def get_public_room_ids(self) -> List[str]:
return await self.db_pool.simple_select_onecol(
table="rooms",
keyvalues={"is_public": True},
retcol="room_id",

View file

@ -537,8 +537,8 @@ class UserDirectoryBackgroundUpdateStore(StateDeltasStore):
desc="get_user_in_directory",
)
def update_user_directory_stream_pos(self, stream_id):
return self.db_pool.simple_update_one(
async def update_user_directory_stream_pos(self, stream_id: str) -> None:
await self.db_pool.simple_update_one(
table="user_directory_stream_pos",
keyvalues={},
updatevalues={"stream_id": stream_id},

View file

@ -81,8 +81,8 @@ class StatsRoomTests(unittest.HomeserverTestCase):
)
)
def get_all_room_state(self):
return self.store.db_pool.simple_select_list(
async def get_all_room_state(self):
return await self.store.db_pool.simple_select_list(
"room_stats_state", None, retcols=("name", "topic", "canonical_alias")
)

View file

@ -148,9 +148,11 @@ class SQLBaseStoreTestCase(unittest.TestCase):
self.mock_txn.__iter__ = Mock(return_value=iter([(1,), (2,), (3,)]))
self.mock_txn.description = (("colA", None, None, None, None, None, None),)
ret = yield self.datastore.db_pool.simple_select_list(
ret = yield defer.ensureDeferred(
self.datastore.db_pool.simple_select_list(
table="tablename", keyvalues={"keycol": "A set"}, retcols=["colA"]
)
)
self.assertEquals([{"colA": 1}, {"colA": 2}, {"colA": 3}], ret)
self.mock_txn.execute.assert_called_with(
@ -161,11 +163,13 @@ class SQLBaseStoreTestCase(unittest.TestCase):
def test_update_one_1col(self):
self.mock_txn.rowcount = 1
yield self.datastore.db_pool.simple_update_one(
yield defer.ensureDeferred(
self.datastore.db_pool.simple_update_one(
table="tablename",
keyvalues={"keycol": "TheKey"},
updatevalues={"columnname": "New Value"},
)
)
self.mock_txn.execute.assert_called_with(
"UPDATE tablename SET columnname = ? WHERE keycol = ?",
@ -176,11 +180,13 @@ class SQLBaseStoreTestCase(unittest.TestCase):
def test_update_one_4cols(self):
self.mock_txn.rowcount = 1
yield self.datastore.db_pool.simple_update_one(
yield defer.ensureDeferred(
self.datastore.db_pool.simple_update_one(
table="tablename",
keyvalues=OrderedDict([("colA", 1), ("colB", 2)]),
updatevalues=OrderedDict([("colC", 3), ("colD", 4)]),
)
)
self.mock_txn.execute.assert_called_with(
"UPDATE tablename SET colC = ?, colD = ? WHERE" " colA = ? AND colB = ?",

View file

@ -42,7 +42,11 @@ class DirectoryStoreTestCase(unittest.TestCase):
self.assertEquals(
["#my-room:test"],
(yield self.store.get_aliases_for_room(self.room.to_string())),
(
yield defer.ensureDeferred(
self.store.get_aliases_for_room(self.room.to_string())
)
),
)
@defer.inlineCallbacks

View file

@ -36,7 +36,9 @@ class DataStoreTestCase(unittest.TestCase):
def test_get_users_paginate(self):
yield self.store.register_user(self.user.to_string(), "pass")
yield defer.ensureDeferred(self.store.create_profile(self.user.localpart))
yield self.store.set_profile_displayname(self.user.localpart, self.displayname)
yield defer.ensureDeferred(
self.store.set_profile_displayname(self.user.localpart, self.displayname)
)
users, total = yield self.store.get_users_paginate(
0, 10, name="bc", guests=False

View file

@ -15,8 +15,9 @@
from mock import Mock
from twisted.internet.defer import ensureDeferred, maybeDeferred, succeed
from twisted.internet.defer import succeed
from synapse.api.errors import FederationError
from synapse.events import make_event_from_dict
from synapse.logging.context import LoggingContext
from synapse.types import Requester, UserID
@ -44,22 +45,17 @@ class MessageAcceptTests(unittest.HomeserverTestCase):
user_id = UserID("us", "test")
our_user = Requester(user_id, None, False, False, None, None)
room_creator = self.homeserver.get_room_creation_handler()
room_deferred = ensureDeferred(
self.room_id = self.get_success(
room_creator.create_room(
our_user, room_creator._presets_dict["public_chat"], ratelimit=False
)
)
self.reactor.advance(0.1)
self.room_id = self.successResultOf(room_deferred)[0]["room_id"]
)[0]["room_id"]
self.store = self.homeserver.get_datastore()
# Figure out what the most recent event is
most_recent = self.successResultOf(
maybeDeferred(
self.homeserver.get_datastore().get_latest_event_ids_in_room,
self.room_id,
)
most_recent = self.get_success(
self.homeserver.get_datastore().get_latest_event_ids_in_room(self.room_id)
)[0]
join_event = make_event_from_dict(
@ -89,19 +85,18 @@ class MessageAcceptTests(unittest.HomeserverTestCase):
)
# Send the join, it should return None (which is not an error)
d = ensureDeferred(
self.assertEqual(
self.get_success(
self.handler.on_receive_pdu(
"test.serv", join_event, sent_to_us_directly=True
)
),
None,
)
self.reactor.advance(1)
self.assertEqual(self.successResultOf(d), None)
# Make sure we actually joined the room
self.assertEqual(
self.successResultOf(
maybeDeferred(self.store.get_latest_event_ids_in_room, self.room_id)
)[0],
self.get_success(self.store.get_latest_event_ids_in_room(self.room_id))[0],
"$join:test.serv",
)
@ -119,8 +114,8 @@ class MessageAcceptTests(unittest.HomeserverTestCase):
self.http_client.post_json = post_json
# Figure out what the most recent event is
most_recent = self.successResultOf(
maybeDeferred(self.store.get_latest_event_ids_in_room, self.room_id)
most_recent = self.get_success(
self.store.get_latest_event_ids_in_room(self.room_id)
)[0]
# Now lie about an event
@ -140,17 +135,14 @@ class MessageAcceptTests(unittest.HomeserverTestCase):
)
with LoggingContext(request="lying_event"):
d = ensureDeferred(
failure = self.get_failure(
self.handler.on_receive_pdu(
"test.serv", lying_event, sent_to_us_directly=True
),
FederationError,
)
)
# Step the reactor, so the database fetches come back
self.reactor.advance(1)
# on_receive_pdu should throw an error
failure = self.failureResultOf(d)
self.assertEqual(
failure.value.args[0],
(
@ -160,8 +152,8 @@ class MessageAcceptTests(unittest.HomeserverTestCase):
)
# Make sure the invalid event isn't there
extrem = maybeDeferred(self.store.get_latest_event_ids_in_room, self.room_id)
self.assertEqual(self.successResultOf(extrem)[0], "$join:test.serv")
extrem = self.get_success(self.store.get_latest_event_ids_in_room(self.room_id))
self.assertEqual(extrem[0], "$join:test.serv")
def test_retry_device_list_resync(self):
"""Tests that device lists are marked as stale if they couldn't be synced, and