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# Copyright 2019 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.
from typing import Optional
from twisted.internet.defer import Deferred
from synapse.config.homeserver import HomeServerConfig
from synapse.config.ratelimiting import FederationRatelimitSettings
from synapse.util.ratelimitutils import FederationRateLimiter
from tests.server import ThreadedMemoryReactorClock, get_clock
from tests.unittest import TestCase
from tests.utils import default_config
class FederationRateLimiterTestCase(TestCase):
def test_ratelimit(self) -> None:
"""A simple test with the default values"""
reactor, clock = get_clock()
rc_config = build_rc_config()
ratelimiter = FederationRateLimiter(clock, rc_config)
with ratelimiter.ratelimit("testhost") as d1:
# shouldn't block
self.successResultOf(d1)
def test_concurrent_limit(self) -> None:
"""Test what happens when we hit the concurrent limit"""
reactor, clock = get_clock()
rc_config = build_rc_config({"rc_federation": {"concurrent": 2}})
ratelimiter = FederationRateLimiter(clock, rc_config)
with ratelimiter.ratelimit("testhost") as d1:
# shouldn't block
self.successResultOf(d1)
cm2 = ratelimiter.ratelimit("testhost")
d2 = cm2.__enter__()
# also shouldn't block
self.successResultOf(d2)
cm3 = ratelimiter.ratelimit("testhost")
d3 = cm3.__enter__()
# this one should block, though ...
self.assertNoResult(d3)
# ... until we complete an earlier request
cm2.__exit__(None, None, None)
self.successResultOf(d3)
def test_sleep_limit(self) -> None:
"""Test what happens when we hit the sleep limit"""
reactor, clock = get_clock()
rc_config = build_rc_config(
{"rc_federation": {"sleep_limit": 2, "sleep_delay": 500}}
)
ratelimiter = FederationRateLimiter(clock, rc_config)
with ratelimiter.ratelimit("testhost") as d1:
# shouldn't block
self.successResultOf(d1)
with ratelimiter.ratelimit("testhost") as d2:
# nor this
self.successResultOf(d2)
with ratelimiter.ratelimit("testhost") as d3:
# this one should block, though ...
self.assertNoResult(d3)
sleep_time = _await_resolution(reactor, d3)
self.assertAlmostEqual(sleep_time, 500, places=3)
def _await_resolution(reactor: ThreadedMemoryReactorClock, d: Deferred) -> float:
"""advance the clock until the deferred completes.
Returns the number of milliseconds it took to complete.
"""
start_time = reactor.seconds()
while not d.called:
reactor.advance(0.01)
return (reactor.seconds() - start_time) * 1000
def build_rc_config(settings: Optional[dict] = None) -> FederationRatelimitSettings:
config_dict = default_config("test")
config_dict.update(settings or {})
config = HomeServerConfig()
config.parse_config_dict(config_dict, "", "")
return config.ratelimiting.rc_federation
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