synapse-old/synapse/storage/devices.py

893 lines
32 KiB
Python

# -*- 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.
import logging
from six import iteritems
from canonicaljson import json
from twisted.internet import defer
from synapse.api.errors import StoreError
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.storage._base import Cache, SQLBaseStore, db_to_json
from synapse.storage.background_updates import BackgroundUpdateStore
from synapse.util import batch_iter
from synapse.util.caches.descriptors import cached, cachedInlineCallbacks, cachedList
logger = logging.getLogger(__name__)
DROP_DEVICE_LIST_STREAMS_NON_UNIQUE_INDEXES = (
"drop_device_list_streams_non_unique_indexes"
)
class DeviceWorkerStore(SQLBaseStore):
def get_device(self, user_id, device_id):
"""Retrieve a device.
Args:
user_id (str): The ID of the user which owns the device
device_id (str): The ID of the device to retrieve
Returns:
defer.Deferred for a dict containing the device information
Raises:
StoreError: if the device is not found
"""
return self._simple_select_one(
table="devices",
keyvalues={"user_id": user_id, "device_id": device_id},
retcols=("user_id", "device_id", "display_name"),
desc="get_device",
)
@defer.inlineCallbacks
def get_devices_by_user(self, user_id):
"""Retrieve all of a user's registered devices.
Args:
user_id (str):
Returns:
defer.Deferred: resolves to a dict from device_id to a dict
containing "device_id", "user_id" and "display_name" for each
device.
"""
devices = yield self._simple_select_list(
table="devices",
keyvalues={"user_id": user_id},
retcols=("user_id", "device_id", "display_name"),
desc="get_devices_by_user",
)
return {d["device_id"]: d for d in devices}
@defer.inlineCallbacks
def get_devices_by_remote(self, destination, from_stream_id, limit):
"""Get stream of updates to send to remote servers
Returns:
Deferred[tuple[int, list[dict]]]:
current stream id (ie, the stream id of the last update included in the
response), and the list of updates
"""
now_stream_id = self._device_list_id_gen.get_current_token()
has_changed = self._device_list_federation_stream_cache.has_entity_changed(
destination, int(from_stream_id)
)
if not has_changed:
return (now_stream_id, [])
# We retrieve n+1 devices from the list of outbound pokes where n is
# our outbound device update limit. We then check if the very last
# device has the same stream_id as the second-to-last device. If so,
# then we ignore all devices with that stream_id and only send the
# devices with a lower stream_id.
#
# If when culling the list we end up with no devices afterwards, we
# consider the device update to be too large, and simply skip the
# stream_id; the rationale being that such a large device list update
# is likely an error.
updates = yield self.runInteraction(
"get_devices_by_remote",
self._get_devices_by_remote_txn,
destination,
from_stream_id,
now_stream_id,
limit + 1,
)
# Return an empty list if there are no updates
if not updates:
return (now_stream_id, [])
# if we have exceeded the limit, we need to exclude any results with the
# same stream_id as the last row.
if len(updates) > limit:
stream_id_cutoff = updates[-1][2]
now_stream_id = stream_id_cutoff - 1
else:
stream_id_cutoff = None
# Perform the equivalent of a GROUP BY
#
# Iterate through the updates list and copy non-duplicate
# (user_id, device_id) entries into a map, with the value being
# the max stream_id across each set of duplicate entries
#
# maps (user_id, device_id) -> stream_id
# as long as their stream_id does not match that of the last row
query_map = {}
for update in updates:
if stream_id_cutoff is not None and update[2] >= stream_id_cutoff:
# Stop processing updates
break
key = (update[0], update[1])
query_map[key] = max(query_map.get(key, 0), update[2])
# If we didn't find any updates with a stream_id lower than the cutoff, it
# means that there are more than limit updates all of which have the same
# steam_id.
# That should only happen if a client is spamming the server with new
# devices, in which case E2E isn't going to work well anyway. We'll just
# skip that stream_id and return an empty list, and continue with the next
# stream_id next time.
if not query_map:
return (stream_id_cutoff, [])
results = yield self._get_device_update_edus_by_remote(
destination, from_stream_id, query_map
)
return (now_stream_id, results)
def _get_devices_by_remote_txn(
self, txn, destination, from_stream_id, now_stream_id, limit
):
"""Return device update information for a given remote destination
Args:
txn (LoggingTransaction): The transaction to execute
destination (str): The host the device updates are intended for
from_stream_id (int): The minimum stream_id to filter updates by, exclusive
now_stream_id (int): The maximum stream_id to filter updates by, inclusive
limit (int): Maximum number of device updates to return
Returns:
List: List of device updates
"""
sql = """
SELECT user_id, device_id, stream_id FROM device_lists_outbound_pokes
WHERE destination = ? AND ? < stream_id AND stream_id <= ? AND sent = ?
ORDER BY stream_id
LIMIT ?
"""
txn.execute(sql, (destination, from_stream_id, now_stream_id, False, limit))
return list(txn)
@defer.inlineCallbacks
def _get_device_update_edus_by_remote(self, destination, from_stream_id, query_map):
"""Returns a list of device update EDUs as well as E2EE keys
Args:
destination (str): The host the device updates are intended for
from_stream_id (int): The minimum stream_id to filter updates by, exclusive
query_map (Dict[(str, str): int]): Dictionary mapping
user_id/device_id to update stream_id
Returns:
List[Dict]: List of objects representing an device update EDU
"""
devices = yield self.runInteraction(
"_get_e2e_device_keys_txn",
self._get_e2e_device_keys_txn,
query_map.keys(),
include_all_devices=True,
include_deleted_devices=True,
)
results = []
for user_id, user_devices in iteritems(devices):
# The prev_id for the first row is always the last row before
# `from_stream_id`
prev_id = yield self._get_last_device_update_for_remote_user(
destination, user_id, from_stream_id
)
for device_id, device in iteritems(user_devices):
stream_id = query_map[(user_id, device_id)]
result = {
"user_id": user_id,
"device_id": device_id,
"prev_id": [prev_id] if prev_id else [],
"stream_id": stream_id,
}
prev_id = stream_id
if device is not None:
key_json = device.get("key_json", None)
if key_json:
result["keys"] = db_to_json(key_json)
device_display_name = device.get("device_display_name", None)
if device_display_name:
result["device_display_name"] = device_display_name
else:
result["deleted"] = True
results.append(result)
return results
def _get_last_device_update_for_remote_user(
self, destination, user_id, from_stream_id
):
def f(txn):
prev_sent_id_sql = """
SELECT coalesce(max(stream_id), 0) as stream_id
FROM device_lists_outbound_last_success
WHERE destination = ? AND user_id = ? AND stream_id <= ?
"""
txn.execute(prev_sent_id_sql, (destination, user_id, from_stream_id))
rows = txn.fetchall()
return rows[0][0]
return self.runInteraction("get_last_device_update_for_remote_user", f)
def mark_as_sent_devices_by_remote(self, destination, stream_id):
"""Mark that updates have successfully been sent to the destination.
"""
return self.runInteraction(
"mark_as_sent_devices_by_remote",
self._mark_as_sent_devices_by_remote_txn,
destination,
stream_id,
)
def _mark_as_sent_devices_by_remote_txn(self, txn, destination, stream_id):
# We update the device_lists_outbound_last_success with the successfully
# poked users. We do the join to see which users need to be inserted and
# which updated.
sql = """
SELECT user_id, coalesce(max(o.stream_id), 0), (max(s.stream_id) IS NOT NULL)
FROM device_lists_outbound_pokes as o
LEFT JOIN device_lists_outbound_last_success as s
USING (destination, user_id)
WHERE destination = ? AND o.stream_id <= ?
GROUP BY user_id
"""
txn.execute(sql, (destination, stream_id))
rows = txn.fetchall()
sql = """
UPDATE device_lists_outbound_last_success
SET stream_id = ?
WHERE destination = ? AND user_id = ?
"""
txn.executemany(sql, ((row[1], destination, row[0]) for row in rows if row[2]))
sql = """
INSERT INTO device_lists_outbound_last_success
(destination, user_id, stream_id) VALUES (?, ?, ?)
"""
txn.executemany(
sql, ((destination, row[0], row[1]) for row in rows if not row[2])
)
# Delete all sent outbound pokes
sql = """
DELETE FROM device_lists_outbound_pokes
WHERE destination = ? AND stream_id <= ?
"""
txn.execute(sql, (destination, stream_id))
def get_device_stream_token(self):
return self._device_list_id_gen.get_current_token()
@defer.inlineCallbacks
def get_user_devices_from_cache(self, query_list):
"""Get the devices (and keys if any) for remote users from the cache.
Args:
query_list(list): List of (user_id, device_ids), if device_ids is
falsey then return all device ids for that user.
Returns:
(user_ids_not_in_cache, results_map), where user_ids_not_in_cache is
a set of user_ids and results_map is a mapping of
user_id -> device_id -> device_info
"""
user_ids = set(user_id for user_id, _ in query_list)
user_map = yield self.get_device_list_last_stream_id_for_remotes(list(user_ids))
user_ids_in_cache = set(
user_id for user_id, stream_id in user_map.items() if stream_id
)
user_ids_not_in_cache = user_ids - user_ids_in_cache
results = {}
for user_id, device_id in query_list:
if user_id not in user_ids_in_cache:
continue
if device_id:
device = yield self._get_cached_user_device(user_id, device_id)
results.setdefault(user_id, {})[device_id] = device
else:
results[user_id] = yield self._get_cached_devices_for_user(user_id)
return (user_ids_not_in_cache, results)
@cachedInlineCallbacks(num_args=2, tree=True)
def _get_cached_user_device(self, user_id, device_id):
content = yield self._simple_select_one_onecol(
table="device_lists_remote_cache",
keyvalues={"user_id": user_id, "device_id": device_id},
retcol="content",
desc="_get_cached_user_device",
)
return db_to_json(content)
@cachedInlineCallbacks()
def _get_cached_devices_for_user(self, user_id):
devices = yield self._simple_select_list(
table="device_lists_remote_cache",
keyvalues={"user_id": user_id},
retcols=("device_id", "content"),
desc="_get_cached_devices_for_user",
)
return {
device["device_id"]: db_to_json(device["content"]) for device in devices
}
def get_devices_with_keys_by_user(self, user_id):
"""Get all devices (with any device keys) for a user
Returns:
(stream_id, devices)
"""
return self.runInteraction(
"get_devices_with_keys_by_user",
self._get_devices_with_keys_by_user_txn,
user_id,
)
def _get_devices_with_keys_by_user_txn(self, txn, user_id):
now_stream_id = self._device_list_id_gen.get_current_token()
devices = self._get_e2e_device_keys_txn(
txn, [(user_id, None)], include_all_devices=True
)
if devices:
user_devices = devices[user_id]
results = []
for device_id, device in iteritems(user_devices):
result = {"device_id": device_id}
key_json = device.get("key_json", None)
if key_json:
result["keys"] = db_to_json(key_json)
device_display_name = device.get("device_display_name", None)
if device_display_name:
result["device_display_name"] = device_display_name
results.append(result)
return now_stream_id, results
return now_stream_id, []
def get_users_whose_devices_changed(self, from_key, user_ids):
"""Get set of users whose devices have changed since `from_key` that
are in the given list of user_ids.
Args:
from_key (str): The device lists stream token
user_ids (Iterable[str])
Returns:
Deferred[set[str]]: The set of user_ids whose devices have changed
since `from_key`
"""
from_key = int(from_key)
# Get set of users who *may* have changed. Users not in the returned
# list have definitely not changed.
to_check = list(
self._device_list_stream_cache.get_entities_changed(user_ids, from_key)
)
if not to_check:
return defer.succeed(set())
def _get_users_whose_devices_changed_txn(txn):
changes = set()
sql = """
SELECT DISTINCT user_id FROM device_lists_stream
WHERE stream_id > ?
AND user_id IN (%s)
"""
for chunk in batch_iter(to_check, 100):
txn.execute(sql % (",".join("?" for _ in chunk),), (from_key,) + chunk)
changes.update(user_id for user_id, in txn)
return changes
return self.runInteraction(
"get_users_whose_devices_changed", _get_users_whose_devices_changed_txn
)
def get_all_device_list_changes_for_remotes(self, from_key, to_key):
"""Return a list of `(stream_id, user_id, destination)` which is the
combined list of changes to devices, and which destinations need to be
poked. `destination` may be None if no destinations need to be poked.
"""
# We do a group by here as there can be a large number of duplicate
# entries, since we throw away device IDs.
sql = """
SELECT MAX(stream_id) AS stream_id, user_id, destination
FROM device_lists_stream
LEFT JOIN device_lists_outbound_pokes USING (stream_id, user_id, device_id)
WHERE ? < stream_id AND stream_id <= ?
GROUP BY user_id, destination
"""
return self._execute(
"get_all_device_list_changes_for_remotes", None, sql, from_key, to_key
)
@cached(max_entries=10000)
def get_device_list_last_stream_id_for_remote(self, user_id):
"""Get the last stream_id we got for a user. May be None if we haven't
got any information for them.
"""
return self._simple_select_one_onecol(
table="device_lists_remote_extremeties",
keyvalues={"user_id": user_id},
retcol="stream_id",
desc="get_device_list_last_stream_id_for_remote",
allow_none=True,
)
@cachedList(
cached_method_name="get_device_list_last_stream_id_for_remote",
list_name="user_ids",
inlineCallbacks=True,
)
def get_device_list_last_stream_id_for_remotes(self, user_ids):
rows = yield self._simple_select_many_batch(
table="device_lists_remote_extremeties",
column="user_id",
iterable=user_ids,
retcols=("user_id", "stream_id"),
desc="get_device_list_last_stream_id_for_remotes",
)
results = {user_id: None for user_id in user_ids}
results.update({row["user_id"]: row["stream_id"] for row in rows})
return results
class DeviceStore(DeviceWorkerStore, BackgroundUpdateStore):
def __init__(self, db_conn, hs):
super(DeviceStore, self).__init__(db_conn, hs)
# Map of (user_id, device_id) -> bool. If there is an entry that implies
# the device exists.
self.device_id_exists_cache = Cache(
name="device_id_exists", keylen=2, max_entries=10000
)
self._clock.looping_call(self._prune_old_outbound_device_pokes, 60 * 60 * 1000)
self.register_background_index_update(
"device_lists_stream_idx",
index_name="device_lists_stream_user_id",
table="device_lists_stream",
columns=["user_id", "device_id"],
)
# create a unique index on device_lists_remote_cache
self.register_background_index_update(
"device_lists_remote_cache_unique_idx",
index_name="device_lists_remote_cache_unique_id",
table="device_lists_remote_cache",
columns=["user_id", "device_id"],
unique=True,
)
# And one on device_lists_remote_extremeties
self.register_background_index_update(
"device_lists_remote_extremeties_unique_idx",
index_name="device_lists_remote_extremeties_unique_idx",
table="device_lists_remote_extremeties",
columns=["user_id"],
unique=True,
)
# once they complete, we can remove the old non-unique indexes.
self.register_background_update_handler(
DROP_DEVICE_LIST_STREAMS_NON_UNIQUE_INDEXES,
self._drop_device_list_streams_non_unique_indexes,
)
@defer.inlineCallbacks
def store_device(self, user_id, device_id, initial_device_display_name):
"""Ensure the given device is known; add it to the store if not
Args:
user_id (str): id of user associated with the device
device_id (str): id of device
initial_device_display_name (str): initial displayname of the
device. Ignored if device exists.
Returns:
defer.Deferred: boolean whether the device was inserted or an
existing device existed with that ID.
"""
key = (user_id, device_id)
if self.device_id_exists_cache.get(key, None):
return False
try:
inserted = yield self._simple_insert(
"devices",
values={
"user_id": user_id,
"device_id": device_id,
"display_name": initial_device_display_name,
},
desc="store_device",
or_ignore=True,
)
self.device_id_exists_cache.prefill(key, True)
return inserted
except Exception as e:
logger.error(
"store_device with device_id=%s(%r) user_id=%s(%r)"
" display_name=%s(%r) failed: %s",
type(device_id).__name__,
device_id,
type(user_id).__name__,
user_id,
type(initial_device_display_name).__name__,
initial_device_display_name,
e,
)
raise StoreError(500, "Problem storing device.")
@defer.inlineCallbacks
def delete_device(self, user_id, device_id):
"""Delete a device.
Args:
user_id (str): The ID of the user which owns the device
device_id (str): The ID of the device to delete
Returns:
defer.Deferred
"""
yield self._simple_delete_one(
table="devices",
keyvalues={"user_id": user_id, "device_id": device_id},
desc="delete_device",
)
self.device_id_exists_cache.invalidate((user_id, device_id))
@defer.inlineCallbacks
def delete_devices(self, user_id, device_ids):
"""Deletes several devices.
Args:
user_id (str): The ID of the user which owns the devices
device_ids (list): The IDs of the devices to delete
Returns:
defer.Deferred
"""
yield self._simple_delete_many(
table="devices",
column="device_id",
iterable=device_ids,
keyvalues={"user_id": user_id},
desc="delete_devices",
)
for device_id in device_ids:
self.device_id_exists_cache.invalidate((user_id, device_id))
def update_device(self, user_id, device_id, new_display_name=None):
"""Update a device.
Args:
user_id (str): The ID of the user which owns the device
device_id (str): The ID of the device to update
new_display_name (str|None): new displayname for device; None
to leave unchanged
Raises:
StoreError: if the device is not found
Returns:
defer.Deferred
"""
updates = {}
if new_display_name is not None:
updates["display_name"] = new_display_name
if not updates:
return defer.succeed(None)
return self._simple_update_one(
table="devices",
keyvalues={"user_id": user_id, "device_id": device_id},
updatevalues=updates,
desc="update_device",
)
@defer.inlineCallbacks
def mark_remote_user_device_list_as_unsubscribed(self, user_id):
"""Mark that we no longer track device lists for remote user.
"""
yield self._simple_delete(
table="device_lists_remote_extremeties",
keyvalues={"user_id": user_id},
desc="mark_remote_user_device_list_as_unsubscribed",
)
self.get_device_list_last_stream_id_for_remote.invalidate((user_id,))
def update_remote_device_list_cache_entry(
self, user_id, device_id, content, stream_id
):
"""Updates a single device in the cache of a remote user's devicelist.
Note: assumes that we are the only thread that can be updating this user's
device list.
Args:
user_id (str): User to update device list for
device_id (str): ID of decivice being updated
content (dict): new data on this device
stream_id (int): the version of the device list
Returns:
Deferred[None]
"""
return self.runInteraction(
"update_remote_device_list_cache_entry",
self._update_remote_device_list_cache_entry_txn,
user_id,
device_id,
content,
stream_id,
)
def _update_remote_device_list_cache_entry_txn(
self, txn, user_id, device_id, content, stream_id
):
if content.get("deleted"):
self._simple_delete_txn(
txn,
table="device_lists_remote_cache",
keyvalues={"user_id": user_id, "device_id": device_id},
)
txn.call_after(self.device_id_exists_cache.invalidate, (user_id, device_id))
else:
self._simple_upsert_txn(
txn,
table="device_lists_remote_cache",
keyvalues={"user_id": user_id, "device_id": device_id},
values={"content": json.dumps(content)},
# we don't need to lock, because we assume we are the only thread
# updating this user's devices.
lock=False,
)
txn.call_after(self._get_cached_user_device.invalidate, (user_id, device_id))
txn.call_after(self._get_cached_devices_for_user.invalidate, (user_id,))
txn.call_after(
self.get_device_list_last_stream_id_for_remote.invalidate, (user_id,)
)
self._simple_upsert_txn(
txn,
table="device_lists_remote_extremeties",
keyvalues={"user_id": user_id},
values={"stream_id": stream_id},
# again, we can assume we are the only thread updating this user's
# extremity.
lock=False,
)
def update_remote_device_list_cache(self, user_id, devices, stream_id):
"""Replace the entire cache of the remote user's devices.
Note: assumes that we are the only thread that can be updating this user's
device list.
Args:
user_id (str): User to update device list for
devices (list[dict]): list of device objects supplied over federation
stream_id (int): the version of the device list
Returns:
Deferred[None]
"""
return self.runInteraction(
"update_remote_device_list_cache",
self._update_remote_device_list_cache_txn,
user_id,
devices,
stream_id,
)
def _update_remote_device_list_cache_txn(self, txn, user_id, devices, stream_id):
self._simple_delete_txn(
txn, table="device_lists_remote_cache", keyvalues={"user_id": user_id}
)
self._simple_insert_many_txn(
txn,
table="device_lists_remote_cache",
values=[
{
"user_id": user_id,
"device_id": content["device_id"],
"content": json.dumps(content),
}
for content in devices
],
)
txn.call_after(self._get_cached_devices_for_user.invalidate, (user_id,))
txn.call_after(self._get_cached_user_device.invalidate_many, (user_id,))
txn.call_after(
self.get_device_list_last_stream_id_for_remote.invalidate, (user_id,)
)
self._simple_upsert_txn(
txn,
table="device_lists_remote_extremeties",
keyvalues={"user_id": user_id},
values={"stream_id": stream_id},
# we don't need to lock, because we can assume we are the only thread
# updating this user's extremity.
lock=False,
)
@defer.inlineCallbacks
def add_device_change_to_streams(self, user_id, device_ids, hosts):
"""Persist that a user's devices have been updated, and which hosts
(if any) should be poked.
"""
with self._device_list_id_gen.get_next() as stream_id:
yield self.runInteraction(
"add_device_change_to_streams",
self._add_device_change_txn,
user_id,
device_ids,
hosts,
stream_id,
)
return stream_id
def _add_device_change_txn(self, txn, user_id, device_ids, hosts, stream_id):
now = self._clock.time_msec()
txn.call_after(
self._device_list_stream_cache.entity_has_changed, user_id, stream_id
)
for host in hosts:
txn.call_after(
self._device_list_federation_stream_cache.entity_has_changed,
host,
stream_id,
)
# Delete older entries in the table, as we really only care about
# when the latest change happened.
txn.executemany(
"""
DELETE FROM device_lists_stream
WHERE user_id = ? AND device_id = ? AND stream_id < ?
""",
[(user_id, device_id, stream_id) for device_id in device_ids],
)
self._simple_insert_many_txn(
txn,
table="device_lists_stream",
values=[
{"stream_id": stream_id, "user_id": user_id, "device_id": device_id}
for device_id in device_ids
],
)
self._simple_insert_many_txn(
txn,
table="device_lists_outbound_pokes",
values=[
{
"destination": destination,
"stream_id": stream_id,
"user_id": user_id,
"device_id": device_id,
"sent": False,
"ts": now,
}
for destination in hosts
for device_id in device_ids
],
)
def _prune_old_outbound_device_pokes(self):
"""Delete old entries out of the device_lists_outbound_pokes to ensure
that we don't fill up due to dead servers. We keep one entry per
(destination, user_id) tuple to ensure that the prev_ids remain correct
if the server does come back.
"""
yesterday = self._clock.time_msec() - 24 * 60 * 60 * 1000
def _prune_txn(txn):
select_sql = """
SELECT destination, user_id, max(stream_id) as stream_id
FROM device_lists_outbound_pokes
GROUP BY destination, user_id
HAVING min(ts) < ? AND count(*) > 1
"""
txn.execute(select_sql, (yesterday,))
rows = txn.fetchall()
if not rows:
return
delete_sql = """
DELETE FROM device_lists_outbound_pokes
WHERE ts < ? AND destination = ? AND user_id = ? AND stream_id < ?
"""
txn.executemany(
delete_sql, ((yesterday, row[0], row[1], row[2]) for row in rows)
)
# Since we've deleted unsent deltas, we need to remove the entry
# of last successful sent so that the prev_ids are correctly set.
sql = """
DELETE FROM device_lists_outbound_last_success
WHERE destination = ? AND user_id = ?
"""
txn.executemany(sql, ((row[0], row[1]) for row in rows))
logger.info("Pruned %d device list outbound pokes", txn.rowcount)
return run_as_background_process(
"prune_old_outbound_device_pokes",
self.runInteraction,
"_prune_old_outbound_device_pokes",
_prune_txn,
)
@defer.inlineCallbacks
def _drop_device_list_streams_non_unique_indexes(self, progress, batch_size):
def f(conn):
txn = conn.cursor()
txn.execute("DROP INDEX IF EXISTS device_lists_remote_cache_id")
txn.execute("DROP INDEX IF EXISTS device_lists_remote_extremeties_id")
txn.close()
yield self.runWithConnection(f)
yield self._end_background_update(DROP_DEVICE_LIST_STREAMS_NON_UNIQUE_INDEXES)
return 1