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Merge pull request #9062 from matrix-org/jaywink/admin-forward-extremities

Add forward extremities endpoint to rooms admin API
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Jason Robinson 2021-01-26 12:57:38 +02:00 committed by GitHub
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6 changed files with 220 additions and 2 deletions

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changelog.d/9062.feature Normal file
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@ -0,0 +1 @@
Add admin API for getting and deleting forward extremities for a room.

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@ -9,6 +9,7 @@
* [Response](#response)
* [Undoing room shutdowns](#undoing-room-shutdowns)
- [Make Room Admin API](#make-room-admin-api)
- [Forward Extremities Admin API](#forward-extremities-admin-api)
# List Room API
@ -511,3 +512,55 @@ optionally be specified, e.g.:
"user_id": "@foo:example.com"
}
```
# Forward Extremities Admin API
Enables querying and deleting forward extremities from rooms. When a lot of forward
extremities accumulate in a room, performance can become degraded. For details, see
[#1760](https://github.com/matrix-org/synapse/issues/1760).
## Check for forward extremities
To check the status of forward extremities for a room:
```
GET /_synapse/admin/v1/rooms/<room_id_or_alias>/forward_extremities
```
A response as follows will be returned:
```json
{
"count": 1,
"results": [
{
"event_id": "$M5SP266vsnxctfwFgFLNceaCo3ujhRtg_NiiHabcdefgh",
"state_group": 439,
"depth": 123,
"received_ts": 1611263016761
}
]
}
```
## Deleting forward extremities
**WARNING**: Please ensure you know what you're doing and have read
the related issue [#1760](https://github.com/matrix-org/synapse/issues/1760).
Under no situations should this API be executed as an automated maintenance task!
If a room has lots of forward extremities, the extra can be
deleted as follows:
```
DELETE /_synapse/admin/v1/rooms/<room_id_or_alias>/forward_extremities
```
A response as follows will be returned, indicating the amount of forward extremities
that were deleted.
```json
{
"deleted": 1
}
```

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@ -1,6 +1,8 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018-2019 New Vector Ltd
# Copyright 2020, 2021 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -36,6 +38,7 @@ from synapse.rest.admin.media import ListMediaInRoom, register_servlets_for_medi
from synapse.rest.admin.purge_room_servlet import PurgeRoomServlet
from synapse.rest.admin.rooms import (
DeleteRoomRestServlet,
ForwardExtremitiesRestServlet,
JoinRoomAliasServlet,
ListRoomRestServlet,
MakeRoomAdminRestServlet,
@ -232,6 +235,7 @@ def register_servlets(hs, http_server):
PushersRestServlet(hs).register(http_server)
MakeRoomAdminRestServlet(hs).register(http_server)
ShadowBanRestServlet(hs).register(http_server)
ForwardExtremitiesRestServlet(hs).register(http_server)
def register_servlets_for_client_rest_resource(hs, http_server):

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@ -1,5 +1,5 @@
# -*- coding: utf-8 -*-
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright 2019-2021 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -499,3 +499,60 @@ class MakeRoomAdminRestServlet(RestServlet):
)
return 200, {}
class ForwardExtremitiesRestServlet(RestServlet):
"""Allows a server admin to get or clear forward extremities.
Clearing does not require restarting the server.
Clear forward extremities:
DELETE /_synapse/admin/v1/rooms/<room_id_or_alias>/forward_extremities
Get forward_extremities:
GET /_synapse/admin/v1/rooms/<room_id_or_alias>/forward_extremities
"""
PATTERNS = admin_patterns("/rooms/(?P<room_identifier>[^/]*)/forward_extremities")
def __init__(self, hs: "HomeServer"):
self.hs = hs
self.auth = hs.get_auth()
self.room_member_handler = hs.get_room_member_handler()
self.store = hs.get_datastore()
async def resolve_room_id(self, room_identifier: str) -> str:
"""Resolve to a room ID, if necessary."""
if RoomID.is_valid(room_identifier):
resolved_room_id = room_identifier
elif RoomAlias.is_valid(room_identifier):
room_alias = RoomAlias.from_string(room_identifier)
room_id, _ = await self.room_member_handler.lookup_room_alias(room_alias)
resolved_room_id = room_id.to_string()
else:
raise SynapseError(
400, "%s was not legal room ID or room alias" % (room_identifier,)
)
if not resolved_room_id:
raise SynapseError(
400, "Unknown room ID or room alias %s" % room_identifier
)
return resolved_room_id
async def on_DELETE(self, request, room_identifier):
requester = await self.auth.get_user_by_req(request)
await assert_user_is_admin(self.auth, requester.user)
room_id = await self.resolve_room_id(room_identifier)
deleted_count = await self.store.delete_forward_extremities_for_room(room_id)
return 200, {"deleted": deleted_count}
async def on_GET(self, request, room_identifier):
requester = await self.auth.get_user_by_req(request)
await assert_user_is_admin(self.auth, requester.user)
room_id = await self.resolve_room_id(room_identifier)
extremities = await self.store.get_forward_extremities_for_room(room_id)
return 200, {"count": len(extremities), "results": extremities}

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@ -1,7 +1,7 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright 2019-2021 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -43,6 +43,7 @@ from .end_to_end_keys import EndToEndKeyStore
from .event_federation import EventFederationStore
from .event_push_actions import EventPushActionsStore
from .events_bg_updates import EventsBackgroundUpdatesStore
from .events_forward_extremities import EventForwardExtremitiesStore
from .filtering import FilteringStore
from .group_server import GroupServerStore
from .keys import KeyStore
@ -118,6 +119,7 @@ class DataStore(
UIAuthStore,
CacheInvalidationWorkerStore,
ServerMetricsStore,
EventForwardExtremitiesStore,
):
def __init__(self, database: DatabasePool, db_conn, hs):
self.hs = hs

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@ -0,0 +1,101 @@
# -*- coding: utf-8 -*-
# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# 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 typing import Dict, List
from synapse.api.errors import SynapseError
from synapse.storage._base import SQLBaseStore
logger = logging.getLogger(__name__)
class EventForwardExtremitiesStore(SQLBaseStore):
async def delete_forward_extremities_for_room(self, room_id: str) -> int:
"""Delete any extra forward extremities for a room.
Invalidates the "get_latest_event_ids_in_room" cache if any forward
extremities were deleted.
Returns count deleted.
"""
def delete_forward_extremities_for_room_txn(txn):
# First we need to get the event_id to not delete
sql = """
SELECT event_id FROM event_forward_extremities
INNER JOIN events USING (room_id, event_id)
WHERE room_id = ?
ORDER BY stream_ordering DESC
LIMIT 1
"""
txn.execute(sql, (room_id,))
rows = txn.fetchall()
try:
event_id = rows[0][0]
logger.debug(
"Found event_id %s as the forward extremity to keep for room %s",
event_id,
room_id,
)
except KeyError:
msg = "No forward extremity event found for room %s" % room_id
logger.warning(msg)
raise SynapseError(400, msg)
# Now delete the extra forward extremities
sql = """
DELETE FROM event_forward_extremities
WHERE event_id != ? AND room_id = ?
"""
txn.execute(sql, (event_id, room_id))
logger.info(
"Deleted %s extra forward extremities for room %s",
txn.rowcount,
room_id,
)
if txn.rowcount > 0:
# Invalidate the cache
self._invalidate_cache_and_stream(
txn, self.get_latest_event_ids_in_room, (room_id,),
)
return txn.rowcount
return await self.db_pool.runInteraction(
"delete_forward_extremities_for_room",
delete_forward_extremities_for_room_txn,
)
async def get_forward_extremities_for_room(self, room_id: str) -> List[Dict]:
"""Get list of forward extremities for a room."""
def get_forward_extremities_for_room_txn(txn):
sql = """
SELECT event_id, state_group, depth, received_ts
FROM event_forward_extremities
INNER JOIN event_to_state_groups USING (event_id)
INNER JOIN events USING (room_id, event_id)
WHERE room_id = ?
"""
txn.execute(sql, (room_id,))
return self.db_pool.cursor_to_dict(txn)
return await self.db_pool.runInteraction(
"get_forward_extremities_for_room", get_forward_extremities_for_room_txn,
)