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