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Room Complexity Client Implementation (#5783)

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Amber Brown 2019-07-30 02:47:27 +10:00 committed by GitHub
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8 changed files with 298 additions and 14 deletions
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1
changelog.d/5783.feature Normal file
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@ -0,0 +1 @@
Synapse can now be configured to not join remote rooms of a given "complexity" (currently, state events) over federation. This option can be used to prevent adverse performance on resource-constrained homeservers.

17
docs/sample_config.yaml
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@ -278,6 +278,23 @@ listeners:
# Used by phonehome stats to group together related servers.
#server_context: context
# Resource-constrained Homeserver Settings
#
# If limit_remote_rooms.enabled is True, the room complexity will be
# checked before a user joins a new remote room. If it is above
# limit_remote_rooms.complexity, it will disallow joining or
# instantly leave.
#
# limit_remote_rooms.complexity_error can be set to customise the text
# displayed to the user when a room above the complexity threshold has
# its join cancelled.
#
# Uncomment the below lines to enable:
#limit_remote_rooms:
# enabled: True
# complexity: 1.0
# complexity_error: "This room is too complex."
# Whether to require a user to be in the room to add an alias to it.
# Defaults to 'true'.
#

41
synapse/config/server.py
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@ -18,6 +18,7 @@
import logging
import os.path
import attr
from netaddr import IPSet
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
@ -38,6 +39,12 @@ DEFAULT_BIND_ADDRESSES = ["::", "0.0.0.0"]
DEFAULT_ROOM_VERSION = "4"
ROOM_COMPLEXITY_TOO_GREAT = (
"Your homeserver is unable to join rooms this large or complex. "
"Please speak to your server administrator, or upgrade your instance "
"to join this room."
)
class ServerConfig(Config):
def read_config(self, config, **kwargs):
@ -247,6 +254,23 @@ class ServerConfig(Config):
self.gc_thresholds = read_gc_thresholds(config.get("gc_thresholds", None))
@attr.s
class LimitRemoteRoomsConfig(object):
enabled = attr.ib(
validator=attr.validators.instance_of(bool), default=False
)
complexity = attr.ib(
validator=attr.validators.instance_of((int, float)), default=1.0
)
complexity_error = attr.ib(
validator=attr.validators.instance_of(str),
default=ROOM_COMPLEXITY_TOO_GREAT,
)
self.limit_remote_rooms = LimitRemoteRoomsConfig(
**config.get("limit_remote_rooms", {})
)
bind_port = config.get("bind_port")
if bind_port:
if config.get("no_tls", False):
@ -617,6 +641,23 @@ class ServerConfig(Config):
# Used by phonehome stats to group together related servers.
#server_context: context
# Resource-constrained Homeserver Settings
#
# If limit_remote_rooms.enabled is True, the room complexity will be
# checked before a user joins a new remote room. If it is above
# limit_remote_rooms.complexity, it will disallow joining or
# instantly leave.
#
# limit_remote_rooms.complexity_error can be set to customise the text
# displayed to the user when a room above the complexity threshold has
# its join cancelled.
#
# Uncomment the below lines to enable:
#limit_remote_rooms:
# enabled: True
# complexity: 1.0
# complexity_error: "This room is too complex."
# Whether to require a user to be in the room to add an alias to it.
# Defaults to 'true'.
#

36
synapse/federation/federation_client.py
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@ -993,3 +993,39 @@ class FederationClient(FederationBase):
)
raise RuntimeError("Failed to send to any server.")
@defer.inlineCallbacks
def get_room_complexity(self, destination, room_id):
"""
Fetch the complexity of a remote room from another server.
Args:
destination (str): The remote server
room_id (str): The room ID to ask about.
Returns:
Deferred[dict] or Deferred[None]: Dict contains the complexity
metric versions, while None means we could not fetch the complexity.
"""
try:
complexity = yield self.transport_layer.get_room_complexity(
destination=destination, room_id=room_id
)
defer.returnValue(complexity)
except CodeMessageException as e:
# We didn't manage to get it -- probably a 404. We are okay if other
# servers don't give it to us.
logger.debug(
"Failed to fetch room complexity via %s for %s, got a %d",
destination,
room_id,
e.code,
)
except Exception:
logger.exception(
"Failed to fetch room complexity via %s for %s", destination, room_id
)
# If we don't manage to find it, return None. It's not an error if a
# server doesn't give it to us.
defer.returnValue(None)

31
synapse/federation/transport/client.py
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@ -21,7 +21,11 @@ from six.moves import urllib
from twisted.internet import defer
from synapse.api.constants import Membership
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.logging.utils import log_function
logger = logging.getLogger(__name__)
@ -935,6 +939,23 @@ class TransportLayerClient(object):
destination=destination, path=path, data=content, ignore_backoff=True
)
def get_room_complexity(self, destination, room_id):
"""
Args:
destination (str): The remote server
room_id (str): The room ID to ask about.
"""
path = _create_path(FEDERATION_UNSTABLE_PREFIX, "/rooms/%s/complexity", room_id)
return self.client.get_json(destination=destination, path=path)
def _create_path(federation_prefix, path, *args):
"""
Ensures that all args are url encoded.
"""
return federation_prefix + path % tuple(urllib.parse.quote(arg, "") for arg in args)
def _create_v1_path(path, *args):
"""Creates a path against V1 federation API from the path template and
@ -951,9 +972,7 @@ def _create_v1_path(path, *args):
Returns:
str
"""
return FEDERATION_V1_PREFIX + path % tuple(
urllib.parse.quote(arg, "") for arg in args
)
return _create_path(FEDERATION_V1_PREFIX, path, *args)
def _create_v2_path(path, *args):
@ -971,6 +990,4 @@ def _create_v2_path(path, *args):
Returns:
str
"""
return FEDERATION_V2_PREFIX + path % tuple(
urllib.parse.quote(arg, "") for arg in args
)
return _create_path(FEDERATION_V2_PREFIX, path, *args)

25
synapse/handlers/federation.py
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@ -2796,3 +2796,28 @@ class FederationHandler(BaseHandler):
)
else:
return user_joined_room(self.distributor, user, room_id)
@defer.inlineCallbacks
def get_room_complexity(self, remote_room_hosts, room_id):
"""
Fetch the complexity of a remote room over federation.
Args:
remote_room_hosts (list[str]): The remote servers to ask.
room_id (str): The room ID to ask about.
Returns:
Deferred[dict] or Deferred[None]: Dict contains the complexity
metric versions, while None means we could not fetch the complexity.
"""
for host in remote_room_hosts:
res = yield self.federation_client.get_room_complexity(host, room_id)
# We got a result, return it.
if res:
defer.returnValue(res)
# We fell off the bottom, couldn't get the complexity from anyone. Oh
# well.
defer.returnValue(None)

84
synapse/handlers/room_member.py
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@ -26,8 +26,7 @@ from unpaddedbase64 import decode_base64
from twisted.internet import defer
import synapse.server
import synapse.types
from synapse import types
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import AuthError, Codes, HttpResponseException, SynapseError
from synapse.types import RoomID, UserID
@ -543,7 +542,7 @@ class RoomMemberHandler(object):
), "Sender (%s) must be same as requester (%s)" % (sender, requester.user)
assert self.hs.is_mine(sender), "Sender must be our own: %s" % (sender,)
else:
requester = synapse.types.create_requester(target_user)
requester = types.create_requester(target_user)
prev_event = yield self.event_creation_handler.deduplicate_state_event(
event, context
@ -945,6 +944,47 @@ class RoomMemberMasterHandler(RoomMemberHandler):
self.distributor.declare("user_joined_room")
self.distributor.declare("user_left_room")
@defer.inlineCallbacks
def _is_remote_room_too_complex(self, room_id, remote_room_hosts):
"""
Check if complexity of a remote room is too great.
Args:
room_id (str)
remote_room_hosts (list[str])
Returns: bool of whether the complexity is too great, or None
if unable to be fetched
"""
max_complexity = self.hs.config.limit_remote_rooms.complexity
complexity = yield self.federation_handler.get_room_complexity(
remote_room_hosts, room_id
)
if complexity:
if complexity["v1"] > max_complexity:
return True
return False
return None
@defer.inlineCallbacks
def _is_local_room_too_complex(self, room_id):
"""
Check if the complexity of a local room is too great.
Args:
room_id (str)
Returns: bool
"""
max_complexity = self.hs.config.limit_remote_rooms.complexity
complexity = yield self.store.get_room_complexity(room_id)
if complexity["v1"] > max_complexity:
return True
return False
@defer.inlineCallbacks
def _remote_join(self, requester, remote_room_hosts, room_id, user, content):
"""Implements RoomMemberHandler._remote_join
@ -952,7 +992,6 @@ class RoomMemberMasterHandler(RoomMemberHandler):
# filter ourselves out of remote_room_hosts: do_invite_join ignores it
# and if it is the only entry we'd like to return a 404 rather than a
# 500.
remote_room_hosts = [
host for host in remote_room_hosts if host != self.hs.hostname
]
@ -960,6 +999,18 @@ class RoomMemberMasterHandler(RoomMemberHandler):
if len(remote_room_hosts) == 0:
raise SynapseError(404, "No known servers")
if self.hs.config.limit_remote_rooms.enabled:
# Fetch the room complexity
too_complex = yield self._is_remote_room_too_complex(
room_id, remote_room_hosts
)
if too_complex is True:
raise SynapseError(
code=400,
msg=self.hs.config.limit_remote_rooms.complexity_error,
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
)
# We don't do an auth check if we are doing an invite
# join dance for now, since we're kinda implicitly checking
# that we are allowed to join when we decide whether or not we
@ -969,6 +1020,31 @@ class RoomMemberMasterHandler(RoomMemberHandler):
)
yield self._user_joined_room(user, room_id)
# Check the room we just joined wasn't too large, if we didn't fetch the
# complexity of it before.
if self.hs.config.limit_remote_rooms.enabled:
if too_complex is False:
# We checked, and we're under the limit.
return
# Check again, but with the local state events
too_complex = yield self._is_local_room_too_complex(room_id)
if too_complex is False:
# We're under the limit.
return
# The room is too large. Leave.
requester = types.create_requester(user, None, False, None)
yield self.update_membership(
requester=requester, target=user, room_id=room_id, action="leave"
)
raise SynapseError(
code=400,
msg=self.hs.config.limit_remote_rooms.complexity_error,
errcode=Codes.RESOURCE_LIMIT_EXCEEDED,
)
@defer.inlineCallbacks
def _remote_reject_invite(self, requester, remote_room_hosts, room_id, target):
"""Implements RoomMemberHandler._remote_reject_invite

77
tests/federation/test_complexity.py
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@ -13,12 +13,16 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from mock import Mock
from twisted.internet import defer
from synapse.api.errors import Codes, SynapseError
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.types import UserID
from synapse.util.ratelimitutils import FederationRateLimiter
from tests import unittest
@ -33,9 +37,8 @@ class RoomComplexityTests(unittest.HomeserverTestCase):
]
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
config = super().default_config(name=name)
config["limit_remote_rooms"] = {"enabled": True, "complexity": 0.05}
return config
def prepare(self, reactor, clock, homeserver):
@ -88,3 +91,71 @@ class RoomComplexityTests(unittest.HomeserverTestCase):
self.assertEquals(200, channel.code)
complexity = channel.json_body["v1"]
self.assertEqual(complexity, 1.23)
def test_join_too_large(self):
u1 = self.register_user("u1", "pass")
handler = self.hs.get_room_member_handler()
fed_transport = self.hs.get_federation_transport_client()
# Mock out some things, because we don't want to test the whole join
fed_transport.client.get_json = Mock(return_value=defer.succeed({"v1": 9999}))
handler.federation_handler.do_invite_join = Mock(return_value=defer.succeed(1))
d = handler._remote_join(
None,
["otherserver.example"],
"roomid",
UserID.from_string(u1),
{"membership": "join"},
)
self.pump()
# The request failed with a SynapseError saying the resource limit was
# exceeded.
f = self.get_failure(d, SynapseError)
self.assertEqual(f.value.code, 400, f.value)
self.assertEqual(f.value.errcode, Codes.RESOURCE_LIMIT_EXCEEDED)
def test_join_too_large_once_joined(self):
u1 = self.register_user("u1", "pass")
u1_token = self.login("u1", "pass")
# Ok, this might seem a bit weird -- I want to test that we actually
# leave the room, but I don't want to simulate two servers. So, we make
# a local room, which we say we're joining remotely, even if there's no
# remote, because we mock that out. Then, we'll leave the (actually
# local) room, which will be propagated over federation in a real
# scenario.
room_1 = self.helper.create_room_as(u1, tok=u1_token)
handler = self.hs.get_room_member_handler()
fed_transport = self.hs.get_federation_transport_client()
# Mock out some things, because we don't want to test the whole join
fed_transport.client.get_json = Mock(return_value=defer.succeed(None))
handler.federation_handler.do_invite_join = Mock(return_value=defer.succeed(1))
# Artificially raise the complexity
self.hs.get_datastore().get_current_state_event_counts = lambda x: defer.succeed(
600
)
d = handler._remote_join(
None,
["otherserver.example"],
room_1,
UserID.from_string(u1),
{"membership": "join"},
)
self.pump()
# The request failed with a SynapseError saying the resource limit was
# exceeded.
f = self.get_failure(d, SynapseError)
self.assertEqual(f.value.code, 400)
self.assertEqual(f.value.errcode, Codes.RESOURCE_LIMIT_EXCEEDED)