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Fix dummy event insertion consent bug (#6053) 

Fixes #5905
This commit is contained in:
Neil Johnson 2019-09-26 11:47:53 +01:00 committed by Richard van der Hoff
parent d64b70ada2
commit 034db2ba21
5 changed files with 270 additions and 43 deletions
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1
changelog.d/6053.bugfix Normal file
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@ -0,0 +1 @@
Prevent exceptions being logged when extremity-cleanup events fail due to lack of user consent to the terms of service.

77
synapse/handlers/message.py
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@ -222,6 +222,13 @@ class MessageHandler(object):
}
# The duration (in ms) after which rooms should be removed
# `_rooms_to_exclude_from_dummy_event_insertion` (with the effect that we will try
# to generate a dummy event for them once more)
#
_DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY = 7 * 24 * 60 * 60 * 1000
class EventCreationHandler(object):
def __init__(self, hs):
self.hs = hs
@ -258,6 +265,13 @@ class EventCreationHandler(object):
self.config.block_events_without_consent_error
)
# Rooms which should be excluded from dummy insertion. (For instance,
# those without local users who can send events into the room).
#
# map from room id to time-of-last-attempt.
#
self._rooms_to_exclude_from_dummy_event_insertion = {} # type: dict[str, int]
# we need to construct a ConsentURIBuilder here, as it checks that the necessary
# config options, but *only* if we have a configuration for which we are
# going to need it.
@ -888,9 +902,11 @@ class EventCreationHandler(object):
"""Background task to send dummy events into rooms that have a large
number of extremities
"""
self._expire_rooms_to_exclude_from_dummy_event_insertion()
room_ids = yield self.store.get_rooms_with_many_extremities(
min_count=10, limit=5
min_count=10,
limit=5,
room_id_filter=self._rooms_to_exclude_from_dummy_event_insertion.keys(),
)
for room_id in room_ids:
@ -904,21 +920,12 @@ class EventCreationHandler(object):
members = yield self.state.get_current_users_in_room(
room_id, latest_event_ids=latest_event_ids
)
user_id = None
for member in members:
if self.hs.is_mine_id(member):
user_id = member
break
if not user_id:
# We don't have a joined user.
# TODO: We should do something here to stop the room from
# appearing next time.
dummy_event_sent = False
for user_id in members:
if not self.hs.is_mine_id(user_id):
continue
requester = create_requester(user_id)
try:
event, context = yield self.create_event(
requester,
{
@ -932,4 +939,42 @@ class EventCreationHandler(object):
event.internal_metadata.proactively_send = False
yield self.send_nonmember_event(requester, event, context, ratelimit=False)
yield self.send_nonmember_event(
requester, event, context, ratelimit=False
)
dummy_event_sent = True
break
except ConsentNotGivenError:
logger.info(
"Failed to send dummy event into room %s for user %s due to "
"lack of consent. Will try another user" % (room_id, user_id)
)
except AuthError:
logger.info(
"Failed to send dummy event into room %s for user %s due to "
"lack of power. Will try another user" % (room_id, user_id)
)
if not dummy_event_sent:
# Did not find a valid user in the room, so remove from future attempts
# Exclusion is time limited, so the room will be rechecked in the future
# dependent on _DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY
logger.info(
"Failed to send dummy event into room %s. Will exclude it from "
"future attempts until cache expires" % (room_id,)
)
now = self.clock.time_msec()
self._rooms_to_exclude_from_dummy_event_insertion[room_id] = now
def _expire_rooms_to_exclude_from_dummy_event_insertion(self):
expire_before = self.clock.time_msec() - _DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY
to_expire = set()
for room_id, time in self._rooms_to_exclude_from_dummy_event_insertion.items():
if time < expire_before:
to_expire.add(room_id)
for room_id in to_expire:
logger.debug(
"Expiring room id %s from dummy event insertion exclusion cache",
room_id,
)
del self._rooms_to_exclude_from_dummy_event_insertion[room_id]

18
synapse/storage/event_federation.py
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@ -12,6 +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.
import itertools
import logging
import random
@ -190,12 +191,13 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
room_id,
)
def get_rooms_with_many_extremities(self, min_count, limit):
def get_rooms_with_many_extremities(self, min_count, limit, room_id_filter):
"""Get the top rooms with at least N extremities.
Args:
min_count (int): The minimum number of extremities
limit (int): The maximum number of rooms to return.
room_id_filter (iterable[str]): room_ids to exclude from the results
Returns:
Deferred[list]: At most `limit` room IDs that have at least
@ -203,15 +205,25 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
"""
def _get_rooms_with_many_extremities_txn(txn):
where_clause = "1=1"
if room_id_filter:
where_clause = "room_id NOT IN (%s)" % (
",".join("?" for _ in room_id_filter),
)
sql = """
SELECT room_id FROM event_forward_extremities
WHERE %s
GROUP BY room_id
HAVING count(*) > ?
ORDER BY count(*) DESC
LIMIT ?
"""
""" % (
where_clause,
)
txn.execute(sql, (min_count, limit))
query_args = list(itertools.chain(room_id_filter, [min_count, limit]))
txn.execute(sql, query_args)
return [room_id for room_id, in txn]
return self.runInteraction(

157
tests/storage/test_cleanup_extrems.py
View File

@ -14,7 +14,13 @@
# limitations under the License.
import os.path
from unittest.mock import patch
from mock import Mock
import synapse.rest.admin
from synapse.api.constants import EventTypes
from synapse.rest.client.v1 import login, room
from synapse.storage import prepare_database
from synapse.types import Requester, UserID
@ -225,6 +231,14 @@ class CleanupExtremBackgroundUpdateStoreTestCase(HomeserverTestCase):
class CleanupExtremDummyEventsTestCase(HomeserverTestCase):
CONSENT_VERSION = "1"
EXTREMITIES_COUNT = 50
servlets = [
synapse.rest.admin.register_servlets_for_client_rest_resource,
login.register_servlets,
room.register_servlets,
]
def make_homeserver(self, reactor, clock):
config = self.default_config()
config["cleanup_extremities_with_dummy_events"] = True
@ -233,27 +247,19 @@ class CleanupExtremDummyEventsTestCase(HomeserverTestCase):
def prepare(self, reactor, clock, homeserver):
self.store = homeserver.get_datastore()
self.room_creator = homeserver.get_room_creation_handler()
self.event_creator_handler = homeserver.get_event_creation_handler()
# Create a test user and room
self.user = UserID("alice", "test")
self.user = UserID.from_string(self.register_user("user1", "password"))
self.token1 = self.login("user1", "password")
self.requester = Requester(self.user, None, False, None, None)
info = self.get_success(self.room_creator.create_room(self.requester, {}))
self.room_id = info["room_id"]
self.event_creator = homeserver.get_event_creation_handler()
homeserver.config.user_consent_version = self.CONSENT_VERSION
def test_send_dummy_event(self):
# Create a bushy graph with 50 extremities.
event_id_start = self.create_and_send_event(self.room_id, self.user)
for _ in range(50):
self.create_and_send_event(
self.room_id, self.user, prev_event_ids=[event_id_start]
)
latest_event_ids = self.get_success(
self.store.get_latest_event_ids_in_room(self.room_id)
)
self.assertEqual(len(latest_event_ids), 50)
self._create_extremity_rich_graph()
# Pump the reactor repeatedly so that the background updates have a
# chance to run.
@ -263,3 +269,126 @@ class CleanupExtremDummyEventsTestCase(HomeserverTestCase):
self.store.get_latest_event_ids_in_room(self.room_id)
)
self.assertTrue(len(latest_event_ids) < 10, len(latest_event_ids))
@patch("synapse.handlers.message._DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY", new=0)
def test_send_dummy_events_when_insufficient_power(self):
self._create_extremity_rich_graph()
# Criple power levels
self.helper.send_state(
self.room_id,
EventTypes.PowerLevels,
body={"users": {str(self.user): -1}},
tok=self.token1,
)
# Pump the reactor repeatedly so that the background updates have a
# chance to run.
self.pump(10 * 60)
latest_event_ids = self.get_success(
self.store.get_latest_event_ids_in_room(self.room_id)
)
# Check that the room has not been pruned
self.assertTrue(len(latest_event_ids) > 10)
# New user with regular levels
user2 = self.register_user("user2", "password")
token2 = self.login("user2", "password")
self.helper.join(self.room_id, user2, tok=token2)
self.pump(10 * 60)
latest_event_ids = self.get_success(
self.store.get_latest_event_ids_in_room(self.room_id)
)
self.assertTrue(len(latest_event_ids) < 10, len(latest_event_ids))
@patch("synapse.handlers.message._DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY", new=0)
def test_send_dummy_event_without_consent(self):
self._create_extremity_rich_graph()
self._enable_consent_checking()
# Pump the reactor repeatedly so that the background updates have a
# chance to run. Attempt to add dummy event with user that has not consented
# Check that dummy event send fails.
self.pump(10 * 60)
latest_event_ids = self.get_success(
self.store.get_latest_event_ids_in_room(self.room_id)
)
self.assertTrue(len(latest_event_ids) == self.EXTREMITIES_COUNT)
# Create new user, and add consent
user2 = self.register_user("user2", "password")
token2 = self.login("user2", "password")
self.get_success(
self.store.user_set_consent_version(user2, self.CONSENT_VERSION)
)
self.helper.join(self.room_id, user2, tok=token2)
# Background updates should now cause a dummy event to be added to the graph
self.pump(10 * 60)
latest_event_ids = self.get_success(
self.store.get_latest_event_ids_in_room(self.room_id)
)
self.assertTrue(len(latest_event_ids) < 10, len(latest_event_ids))
@patch("synapse.handlers.message._DUMMY_EVENT_ROOM_EXCLUSION_EXPIRY", new=250)
def test_expiry_logic(self):
"""Simple test to ensure that _expire_rooms_to_exclude_from_dummy_event_insertion()
expires old entries correctly.
"""
self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion[
"1"
] = 100000
self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion[
"2"
] = 200000
self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion[
"3"
] = 300000
self.event_creator_handler._expire_rooms_to_exclude_from_dummy_event_insertion()
# All entries within time frame
self.assertEqual(
len(
self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion
),
3,
)
# Oldest room to expire
self.pump(1)
self.event_creator_handler._expire_rooms_to_exclude_from_dummy_event_insertion()
self.assertEqual(
len(
self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion
),
2,
)
# All rooms to expire
self.pump(2)
self.assertEqual(
len(
self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion
),
0,
)
def _create_extremity_rich_graph(self):
"""Helper method to create bushy graph on demand"""
event_id_start = self.create_and_send_event(self.room_id, self.user)
for _ in range(self.EXTREMITIES_COUNT):
self.create_and_send_event(
self.room_id, self.user, prev_event_ids=[event_id_start]
)
latest_event_ids = self.get_success(
self.store.get_latest_event_ids_in_room(self.room_id)
)
self.assertEqual(len(latest_event_ids), 50)
def _enable_consent_checking(self):
"""Helper method to enable consent checking"""
self.event_creator._block_events_without_consent_error = "No consent from user"
consent_uri_builder = Mock()
consent_uri_builder.build_user_consent_uri.return_value = "http://example.com"
self.event_creator._consent_uri_builder = consent_uri_builder

40
tests/storage/test_event_federation.py
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@ -75,3 +75,43 @@ class EventFederationWorkerStoreTestCase(tests.unittest.TestCase):
el = r[i]
depth = el[2]
self.assertLessEqual(5, depth)
@defer.inlineCallbacks
def test_get_rooms_with_many_extremities(self):
room1 = "#room1"
room2 = "#room2"
room3 = "#room3"
def insert_event(txn, i, room_id):
event_id = "$event_%i:local" % i
txn.execute(
(
"INSERT INTO event_forward_extremities (room_id, event_id) "
"VALUES (?, ?)"
),
(room_id, event_id),
)
for i in range(0, 20):
yield self.store.runInteraction("insert", insert_event, i, room1)
yield self.store.runInteraction("insert", insert_event, i, room2)
yield self.store.runInteraction("insert", insert_event, i, room3)
# Test simple case
r = yield self.store.get_rooms_with_many_extremities(5, 5, [])
self.assertEqual(len(r), 3)
# Does filter work?
r = yield self.store.get_rooms_with_many_extremities(5, 5, [room1])
self.assertTrue(room2 in r)
self.assertTrue(room3 in r)
self.assertEqual(len(r), 2)
r = yield self.store.get_rooms_with_many_extremities(5, 5, [room1, room2])
self.assertEqual(r, [room3])
# Does filter and limit work?
r = yield self.store.get_rooms_with_many_extremities(5, 1, [room1])
self.assertTrue(r == [room2] or r == [room3])