diff --git a/changelog.d/5216.misc b/changelog.d/5216.misc new file mode 100644 index 0000000000..dbfa29475f --- /dev/null +++ b/changelog.d/5216.misc @@ -0,0 +1 @@ +Synapse will now serve the experimental "room complexity" API endpoint. diff --git a/synapse/api/urls.py b/synapse/api/urls.py index 3c6bddff7a..e16c386a14 100644 --- a/synapse/api/urls.py +++ b/synapse/api/urls.py @@ -26,6 +26,7 @@ CLIENT_API_PREFIX = "/_matrix/client" FEDERATION_PREFIX = "/_matrix/federation" FEDERATION_V1_PREFIX = FEDERATION_PREFIX + "/v1" FEDERATION_V2_PREFIX = FEDERATION_PREFIX + "/v2" +FEDERATION_UNSTABLE_PREFIX = FEDERATION_PREFIX + "/unstable" STATIC_PREFIX = "/_matrix/static" WEB_CLIENT_PREFIX = "/_matrix/client" CONTENT_REPO_PREFIX = "/_matrix/content" diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py index 385eda2dca..d0efc4e0d3 100644 --- a/synapse/federation/transport/server.py +++ b/synapse/federation/transport/server.py @@ -23,7 +23,11 @@ from twisted.internet import defer import synapse from synapse.api.errors import Codes, FederationDeniedError, SynapseError from synapse.api.room_versions import RoomVersions -from synapse.api.urls import FEDERATION_V1_PREFIX, FEDERATION_V2_PREFIX +from synapse.api.urls import ( + FEDERATION_UNSTABLE_PREFIX, + FEDERATION_V1_PREFIX, + FEDERATION_V2_PREFIX, +) from synapse.http.endpoint import parse_and_validate_server_name from synapse.http.server import JsonResource from synapse.http.servlet import ( @@ -1304,6 +1308,30 @@ class FederationGroupsSettingJoinPolicyServlet(BaseFederationServlet): defer.returnValue((200, new_content)) +class RoomComplexityServlet(BaseFederationServlet): + """ + Indicates to other servers how complex (and therefore likely + resource-intensive) a public room this server knows about is. + """ + PATH = "/rooms/(?P[^/]*)/complexity" + PREFIX = FEDERATION_UNSTABLE_PREFIX + + @defer.inlineCallbacks + def on_GET(self, origin, content, query, room_id): + + store = self.handler.hs.get_datastore() + + is_public = yield store.is_room_world_readable_or_publicly_joinable( + room_id + ) + + if not is_public: + raise SynapseError(404, "Room not found", errcode=Codes.INVALID_PARAM) + + complexity = yield store.get_room_complexity(room_id) + defer.returnValue((200, complexity)) + + FEDERATION_SERVLET_CLASSES = ( FederationSendServlet, FederationEventServlet, @@ -1327,6 +1355,7 @@ FEDERATION_SERVLET_CLASSES = ( FederationThirdPartyInviteExchangeServlet, On3pidBindServlet, FederationVersionServlet, + RoomComplexityServlet, ) OPENID_SERVLET_CLASSES = ( diff --git a/synapse/rest/admin/__init__.py b/synapse/rest/admin/__init__.py index 744d85594f..d6c4dcdb18 100644 --- a/synapse/rest/admin/__init__.py +++ b/synapse/rest/admin/__init__.py @@ -822,10 +822,16 @@ class AdminRestResource(JsonResource): def __init__(self, hs): JsonResource.__init__(self, hs, canonical_json=False) + register_servlets(hs, self) - register_servlets_for_client_rest_resource(hs, self) - SendServerNoticeServlet(hs).register(self) - VersionServlet(hs).register(self) + +def register_servlets(hs, http_server): + """ + Register all the admin servlets. + """ + register_servlets_for_client_rest_resource(hs, http_server) + SendServerNoticeServlet(hs).register(http_server) + VersionServlet(hs).register(http_server) def register_servlets_for_client_rest_resource(hs, http_server): diff --git a/synapse/storage/events_worker.py b/synapse/storage/events_worker.py index 21b353cad3..b56c83e460 100644 --- a/synapse/storage/events_worker.py +++ b/synapse/storage/events_worker.py @@ -13,6 +13,8 @@ # See the License for the specific language governing permissions and # limitations under the License. +from __future__ import division + import itertools import logging from collections import namedtuple @@ -614,7 +616,7 @@ class EventsWorkerStore(SQLBaseStore): def _get_total_state_event_counts_txn(self, txn, room_id): """ - See get_state_event_counts. + See get_total_state_event_counts. """ sql = "SELECT COUNT(*) FROM state_events WHERE room_id=?" txn.execute(sql, (room_id,)) @@ -635,3 +637,49 @@ class EventsWorkerStore(SQLBaseStore): "get_total_state_event_counts", self._get_total_state_event_counts_txn, room_id ) + + def _get_current_state_event_counts_txn(self, txn, room_id): + """ + See get_current_state_event_counts. + """ + sql = "SELECT COUNT(*) FROM current_state_events WHERE room_id=?" + txn.execute(sql, (room_id,)) + row = txn.fetchone() + return row[0] if row else 0 + + def get_current_state_event_counts(self, room_id): + """ + Gets the current number of state events in a room. + + Args: + room_id (str) + + Returns: + Deferred[int] + """ + return self.runInteraction( + "get_current_state_event_counts", + self._get_current_state_event_counts_txn, room_id + ) + + @defer.inlineCallbacks + def get_room_complexity(self, room_id): + """ + Get a rough approximation of the complexity of the room. This is used by + remote servers to decide whether they wish to join the room or not. + Higher complexity value indicates that being in the room will consume + more resources. + + Args: + room_id (str) + + Returns: + Deferred[dict[str:int]] of complexity version to complexity. + """ + state_events = yield self.get_current_state_event_counts(room_id) + + # Call this one "v1", so we can introduce new ones as we want to develop + # it. + complexity_v1 = round(state_events / 500, 2) + + defer.returnValue({"v1": complexity_v1}) diff --git a/tests/federation/test_complexity.py b/tests/federation/test_complexity.py new file mode 100644 index 0000000000..1e3e5aec66 --- /dev/null +++ b/tests/federation/test_complexity.py @@ -0,0 +1,90 @@ +# -*- coding: utf-8 -*- +# Copyright 2019 Matrix.org Foundation +# +# 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. + +from twisted.internet import defer + +from synapse.config.ratelimiting import FederationRateLimitConfig +from synapse.federation.transport import server +from synapse.rest import admin +from synapse.rest.client.v1 import login, room +from synapse.util.ratelimitutils import FederationRateLimiter + +from tests import unittest + + +class RoomComplexityTests(unittest.HomeserverTestCase): + + servlets = [ + admin.register_servlets, + room.register_servlets, + login.register_servlets, + ] + + def default_config(self, name='test'): + config = super(RoomComplexityTests, self).default_config(name=name) + config["limit_large_remote_room_joins"] = True + config["limit_large_remote_room_complexity"] = 0.05 + return config + + def prepare(self, reactor, clock, homeserver): + class Authenticator(object): + def authenticate_request(self, request, content): + return defer.succeed("otherserver.nottld") + + ratelimiter = FederationRateLimiter( + clock, + FederationRateLimitConfig( + window_size=1, + sleep_limit=1, + sleep_msec=1, + reject_limit=1000, + concurrent_requests=1000, + ), + ) + server.register_servlets( + homeserver, self.resource, Authenticator(), ratelimiter + ) + + def test_complexity_simple(self): + + u1 = self.register_user("u1", "pass") + u1_token = self.login("u1", "pass") + + room_1 = self.helper.create_room_as(u1, tok=u1_token) + self.helper.send_state( + room_1, event_type="m.room.topic", body={"topic": "foo"}, tok=u1_token + ) + + # Get the room complexity + request, channel = self.make_request( + "GET", "/_matrix/federation/unstable/rooms/%s/complexity" % (room_1,) + ) + self.render(request) + self.assertEquals(200, channel.code) + complexity = channel.json_body["v1"] + self.assertTrue(complexity > 0, complexity) + + # Artificially raise the complexity + store = self.hs.get_datastore() + store.get_current_state_event_counts = lambda x: defer.succeed(500 * 1.23) + + # Get the room complexity again -- make sure it's our artificial value + request, channel = self.make_request( + "GET", "/_matrix/federation/unstable/rooms/%s/complexity" % (room_1,) + ) + self.render(request) + self.assertEquals(200, channel.code) + complexity = channel.json_body["v1"] + self.assertEqual(complexity, 1.23)