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https://github.com/element-hq/synapse
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f4e6495b5d
While working on https://github.com/matrix-org/synapse/issues/5665 I found myself digging into the `Ratelimiter` class and seeing that it was both: * Rather undocumented, and * causing a *lot* of config checks This PR attempts to refactor and comment the `Ratelimiter` class, as well as encourage config file accesses to only be done at instantiation. Best to be reviewed commit-by-commit.
98 lines
3.8 KiB
Python
98 lines
3.8 KiB
Python
from synapse.api.ratelimiting import LimitExceededError, Ratelimiter
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from tests import unittest
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class TestRatelimiter(unittest.TestCase):
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def test_allowed_via_can_do_action(self):
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limiter = Ratelimiter(clock=None, rate_hz=0.1, burst_count=1)
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allowed, time_allowed = limiter.can_do_action(key="test_id", _time_now_s=0)
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self.assertTrue(allowed)
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self.assertEquals(10.0, time_allowed)
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allowed, time_allowed = limiter.can_do_action(key="test_id", _time_now_s=5)
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self.assertFalse(allowed)
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self.assertEquals(10.0, time_allowed)
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allowed, time_allowed = limiter.can_do_action(key="test_id", _time_now_s=10)
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self.assertTrue(allowed)
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self.assertEquals(20.0, time_allowed)
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def test_allowed_via_ratelimit(self):
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limiter = Ratelimiter(clock=None, rate_hz=0.1, burst_count=1)
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# Shouldn't raise
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limiter.ratelimit(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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limiter.ratelimit(key="test_id", _time_now_s=5)
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self.assertEqual(context.exception.retry_after_ms, 5000)
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# Shouldn't raise
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limiter.ratelimit(key="test_id", _time_now_s=10)
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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(clock=None, rate_hz=0.1, burst_count=1)
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# First attempt should be allowed
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allowed, time_allowed = limiter.can_do_action(("test_id",), _time_now_s=0,)
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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 = limiter.can_do_action(("test_id",), _time_now_s=1,)
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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 = limiter.can_do_action(
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("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 = limiter.can_do_action(
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("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(clock=None, rate_hz=0.1, burst_count=1)
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# First attempt should be allowed
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limiter.ratelimit(key=("test_id",), _time_now_s=0)
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# Second attempt, 1s later, will fail
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with self.assertRaises(LimitExceededError) as context:
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limiter.ratelimit(key=("test_id",), _time_now_s=1)
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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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limiter.ratelimit(key=("test_id",), _time_now_s=1, rate_hz=10.0)
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# Similarly if we allow a burst of 10 actions
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limiter.ratelimit(key=("test_id",), _time_now_s=1, burst_count=10)
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def test_pruning(self):
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limiter = Ratelimiter(clock=None, rate_hz=0.1, burst_count=1)
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limiter.can_do_action(key="test_id_1", _time_now_s=0)
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self.assertIn("test_id_1", limiter.actions)
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limiter.can_do_action(key="test_id_2", _time_now_s=10)
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self.assertNotIn("test_id_1", limiter.actions)
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