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Allow rate limiters to passively record actions they cannot limit (#13253)

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Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
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David Robertson 2022-07-13 20:09:42 +01:00 • committed by GitHub
parent 0eb7e69768
commit 599c403d99
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3 changed files with 157 additions and 12 deletions
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74
tests/api/test_ratelimiting.py
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@ -314,3 +314,77 @@ class TestRatelimiter(unittest.HomeserverTestCase):
# Check that we get rate limited after using that token.
self.assertFalse(consume_at(11.1))
def test_record_action_which_doesnt_fill_bucket(self) -> None:
limiter = Ratelimiter(
store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=3
)
# Observe two actions, leaving room in the bucket for one more.
limiter.record_action(requester=None, key="a", n_actions=2, _time_now_s=0.0)
# We should be able to take a new action now.
success, _ = self.get_success_or_raise(
limiter.can_do_action(requester=None, key="a", _time_now_s=0.0)
)
self.assertTrue(success)
# ... but not two.
success, _ = self.get_success_or_raise(
limiter.can_do_action(requester=None, key="a", _time_now_s=0.0)
)
self.assertFalse(success)
def test_record_action_which_fills_bucket(self) -> None:
limiter = Ratelimiter(
store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=3
)
# Observe three actions, filling up the bucket.
limiter.record_action(requester=None, key="a", n_actions=3, _time_now_s=0.0)
# We should be unable to take a new action now.
success, _ = self.get_success_or_raise(
limiter.can_do_action(requester=None, key="a", _time_now_s=0.0)
)
self.assertFalse(success)
# If we wait 10 seconds to leak a token, we should be able to take one action...
success, _ = self.get_success_or_raise(
limiter.can_do_action(requester=None, key="a", _time_now_s=10.0)
)
self.assertTrue(success)
# ... but not two.
success, _ = self.get_success_or_raise(
limiter.can_do_action(requester=None, key="a", _time_now_s=10.0)
)
self.assertFalse(success)
def test_record_action_which_overfills_bucket(self) -> None:
limiter = Ratelimiter(
store=self.hs.get_datastores().main, clock=None, rate_hz=0.1, burst_count=3
)
# Observe four actions, exceeding the bucket.
limiter.record_action(requester=None, key="a", n_actions=4, _time_now_s=0.0)
# We should be prevented from taking a new action now.
success, _ = self.get_success_or_raise(
limiter.can_do_action(requester=None, key="a", _time_now_s=0.0)
)
self.assertFalse(success)
# If we wait 10 seconds to leak a token, we should be unable to take an action
# because the bucket is still full.
success, _ = self.get_success_or_raise(
limiter.can_do_action(requester=None, key="a", _time_now_s=10.0)
)
self.assertFalse(success)
# But after another 10 seconds we leak a second token, giving us room for
# action.
success, _ = self.get_success_or_raise(
limiter.can_do_action(requester=None, key="a", _time_now_s=20.0)
)
self.assertTrue(success)