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390 lines
14 KiB
Python
390 lines
14 KiB
Python
from synapse.api.ratelimiting import LimitExceededError, Ratelimiter
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from synapse.appservice import ApplicationService
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from synapse.types import create_requester
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from tests import unittest
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class TestRatelimiter(unittest.HomeserverTestCase):
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def test_allowed_via_can_do_action(self):
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=1
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)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id", _time_now_s=0)
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)
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self.assertTrue(allowed)
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self.assertEqual(10.0, time_allowed)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id", _time_now_s=5)
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)
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self.assertFalse(allowed)
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self.assertEqual(10.0, time_allowed)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id", _time_now_s=10)
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)
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self.assertTrue(allowed)
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self.assertEqual(20.0, time_allowed)
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def test_allowed_appservice_ratelimited_via_can_requester_do_action(self):
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appservice = ApplicationService(
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None,
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id="foo",
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rate_limited=True,
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sender="@as:example.com",
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)
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as_requester = create_requester("@user:example.com", app_service=appservice)
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=1
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)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(as_requester, _time_now_s=0)
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)
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self.assertTrue(allowed)
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self.assertEqual(10.0, time_allowed)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(as_requester, _time_now_s=5)
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)
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self.assertFalse(allowed)
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self.assertEqual(10.0, time_allowed)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(as_requester, _time_now_s=10)
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)
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self.assertTrue(allowed)
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self.assertEqual(20.0, time_allowed)
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def test_allowed_appservice_via_can_requester_do_action(self):
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appservice = ApplicationService(
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None,
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id="foo",
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rate_limited=False,
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sender="@as:example.com",
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)
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as_requester = create_requester("@user:example.com", app_service=appservice)
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=1
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)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(as_requester, _time_now_s=0)
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)
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self.assertTrue(allowed)
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self.assertEqual(-1, time_allowed)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(as_requester, _time_now_s=5)
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)
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self.assertTrue(allowed)
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self.assertEqual(-1, time_allowed)
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(as_requester, _time_now_s=10)
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)
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self.assertTrue(allowed)
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self.assertEqual(-1, time_allowed)
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def test_allowed_via_ratelimit(self):
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=1
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)
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# Shouldn't raise
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self.get_success_or_raise(limiter.ratelimit(None, key="test_id", _time_now_s=0))
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# Should raise
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with self.assertRaises(LimitExceededError) as context:
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self.get_success_or_raise(
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limiter.ratelimit(None, key="test_id", _time_now_s=5)
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)
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self.assertEqual(context.exception.retry_after_ms, 5000)
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# Shouldn't raise
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self.get_success_or_raise(
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limiter.ratelimit(None, key="test_id", _time_now_s=10)
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)
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def test_allowed_via_can_do_action_and_overriding_parameters(self):
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"""Test that we can override options of can_do_action that would otherwise fail
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an action
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"""
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# Create a Ratelimiter with a very low allowed rate_hz and burst_count
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=1
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)
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# First attempt should be allowed
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(
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None,
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("test_id",),
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_time_now_s=0,
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)
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)
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self.assertTrue(allowed)
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self.assertEqual(10.0, time_allowed)
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# Second attempt, 1s later, will fail
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(
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None,
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("test_id",),
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_time_now_s=1,
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)
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)
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self.assertFalse(allowed)
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self.assertEqual(10.0, time_allowed)
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# But, if we allow 10 actions/sec for this request, we should be allowed
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# to continue.
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, ("test_id",), _time_now_s=1, rate_hz=10.0)
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)
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self.assertTrue(allowed)
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self.assertEqual(1.1, time_allowed)
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# Similarly if we allow a burst of 10 actions
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, ("test_id",), _time_now_s=1, burst_count=10)
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)
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self.assertTrue(allowed)
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self.assertEqual(1.0, time_allowed)
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def test_allowed_via_ratelimit_and_overriding_parameters(self):
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"""Test that we can override options of the ratelimit method that would otherwise
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fail an action
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"""
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# Create a Ratelimiter with a very low allowed rate_hz and burst_count
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=1
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)
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# First attempt should be allowed
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self.get_success_or_raise(
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limiter.ratelimit(None, key=("test_id",), _time_now_s=0)
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)
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# Second attempt, 1s later, will fail
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with self.assertRaises(LimitExceededError) as context:
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self.get_success_or_raise(
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limiter.ratelimit(None, key=("test_id",), _time_now_s=1)
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)
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self.assertEqual(context.exception.retry_after_ms, 9000)
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# But, if we allow 10 actions/sec for this request, we should be allowed
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# to continue.
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self.get_success_or_raise(
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limiter.ratelimit(None, key=("test_id",), _time_now_s=1, rate_hz=10.0)
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)
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# Similarly if we allow a burst of 10 actions
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self.get_success_or_raise(
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limiter.ratelimit(None, key=("test_id",), _time_now_s=1, burst_count=10)
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)
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def test_pruning(self):
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=1
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)
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self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id_1", _time_now_s=0)
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)
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self.assertIn("test_id_1", limiter.actions)
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self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id_2", _time_now_s=10)
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)
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self.assertNotIn("test_id_1", limiter.actions)
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def test_db_user_override(self):
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"""Test that users that have ratelimiting disabled in the DB aren't
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ratelimited.
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"""
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store = self.hs.get_datastores().main
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user_id = "@user:test"
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requester = create_requester(user_id)
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self.get_success(
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store.db_pool.simple_insert(
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table="ratelimit_override",
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values={
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"user_id": user_id,
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"messages_per_second": None,
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"burst_count": None,
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},
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desc="test_db_user_override",
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)
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)
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limiter = Ratelimiter(store=store, clock=None, rate_hz=0.1, burst_count=1)
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# Shouldn't raise
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for _ in range(20):
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self.get_success_or_raise(limiter.ratelimit(requester, _time_now_s=0))
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def test_multiple_actions(self):
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=3
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)
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# Test that 4 actions aren't allowed with a maximum burst of 3.
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id", n_actions=4, _time_now_s=0)
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)
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self.assertFalse(allowed)
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# Test that 3 actions are allowed with a maximum burst of 3.
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id", n_actions=3, _time_now_s=0)
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)
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self.assertTrue(allowed)
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self.assertEqual(10.0, time_allowed)
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# Test that, after doing these 3 actions, we can't do any more actions without
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# waiting.
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id", n_actions=1, _time_now_s=0)
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)
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self.assertFalse(allowed)
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self.assertEqual(10.0, time_allowed)
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# Test that after waiting we would be able to do only 1 action.
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# Note that we don't actually do it (update=False) here.
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(
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None,
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key="test_id",
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update=False,
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n_actions=1,
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_time_now_s=10,
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)
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)
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self.assertTrue(allowed)
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# We would be able to do the 5th action at t=20.
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self.assertEqual(20.0, time_allowed)
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# Attempt (but fail) to perform TWO actions at t=10.
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# Those would be the 4th and 5th actions.
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id", n_actions=2, _time_now_s=10)
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)
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self.assertFalse(allowed)
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# The returned time allowed for the next action is now even though we weren't
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# allowed to perform the action because whilst we don't allow 2 actions,
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# we could still do 1.
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self.assertEqual(10.0, time_allowed)
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# Test that after waiting until t=20, we can do perform 2 actions.
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# These are the 4th and 5th actions.
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allowed, time_allowed = self.get_success_or_raise(
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limiter.can_do_action(None, key="test_id", n_actions=2, _time_now_s=20)
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)
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self.assertTrue(allowed)
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# We would be able to do the 6th action at t=30.
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self.assertEqual(30.0, time_allowed)
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def test_rate_limit_burst_only_given_once(self) -> None:
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"""
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Regression test against a bug that meant that you could build up
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extra tokens by timing requests.
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"""
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=3
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)
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def consume_at(time: float) -> bool:
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=time)
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)
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return success
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# Use all our 3 burst tokens
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self.assertTrue(consume_at(0.0))
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self.assertTrue(consume_at(0.1))
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self.assertTrue(consume_at(0.2))
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# Wait to recover 1 token (10 seconds at 0.1 Hz).
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self.assertTrue(consume_at(10.1))
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# Check that we get rate limited after using that token.
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self.assertFalse(consume_at(11.1))
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def test_record_action_which_doesnt_fill_bucket(self) -> None:
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=3
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)
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# Observe two actions, leaving room in the bucket for one more.
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limiter.record_action(requester=None, key="a", n_actions=2, _time_now_s=0.0)
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# We should be able to take a new action now.
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=0.0)
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)
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self.assertTrue(success)
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# ... but not two.
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=0.0)
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)
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self.assertFalse(success)
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def test_record_action_which_fills_bucket(self) -> None:
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=3
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)
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# Observe three actions, filling up the bucket.
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limiter.record_action(requester=None, key="a", n_actions=3, _time_now_s=0.0)
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# We should be unable to take a new action now.
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=0.0)
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)
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self.assertFalse(success)
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# If we wait 10 seconds to leak a token, we should be able to take one action...
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=10.0)
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)
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self.assertTrue(success)
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# ... but not two.
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=10.0)
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)
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self.assertFalse(success)
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def test_record_action_which_overfills_bucket(self) -> None:
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limiter = Ratelimiter(
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store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=3
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)
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# Observe four actions, exceeding the bucket.
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limiter.record_action(requester=None, key="a", n_actions=4, _time_now_s=0.0)
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# We should be prevented from taking a new action now.
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=0.0)
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)
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self.assertFalse(success)
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# If we wait 10 seconds to leak a token, we should be unable to take an action
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# because the bucket is still full.
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=10.0)
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)
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self.assertFalse(success)
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# But after another 10 seconds we leak a second token, giving us room for
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# action.
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success, _ = self.get_success_or_raise(
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limiter.can_do_action(requester=None, key="a", _time_now_s=20.0)
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)
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self.assertTrue(success)
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