def test_rate_liimter_effective_rate_rates():
limiter = RateLimiter(rate_limit=100)
# Static rate limit window
starting_window = monotonic.monotonic()
with mock.patch('ddtrace.vendor.monotonic.monotonic') as mock_time:
mock_time.return_value = starting_window
for _ in range(100):
assert limiter.is_allowed() is True
assert limiter.effective_rate == 1.0
assert limiter.current_window == starting_window
for i in range(1, 101):
assert limiter.is_allowed() is False
rate = 100 / (100 + i)
assert limiter.effective_rate == rate
assert limiter.current_window == starting_window
prev_rate = 0.5
with mock.patch('ddtrace.vendor.monotonic.monotonic') as mock_time:
window = starting_window + 1.0
mock_time.return_value = window
for i in range(100):
assert limiter.is_allowed() is True
assert limiter.effective_rate == 0.75
assert limiter.current_window == window
for i in range(1, 101):
assert limiter.is_allowed() is False
rate = 100 / (100 + i)
assert limiter.effective_rate == (rate + prev_rate) / 2
assert limiter.current_window == window
def test_rate_limiter_rate_limit_negative():
limiter = RateLimiter(rate_limit=-1)
assert limiter.rate_limit == -1
assert limiter.tokens == -1
assert limiter.max_tokens == -1
now = monotonic.monotonic()
with mock.patch('ddtrace.vendor.monotonic.monotonic') as mock_time:
for i in range(10000):
# Make sure the time is different for every check
mock_time.return_value = now + i
assert limiter.is_allowed() is True
def test_rate_limiter_is_allowed_small_gaps():
limiter = RateLimiter(rate_limit=100)
# Start time
now = monotonic.monotonic()
gap = 1.0 / 100.0
# Keep incrementing by a gap to keep us at our rate limit
with mock.patch('ddtrace.vendor.monotonic.monotonic') as mock_time:
for i in range(10000):
# Keep the same timeframe
mock_time.return_value = now + (gap * i)
assert limiter.is_allowed() is True
def test_rate_liimter_effective_rate_starting_rate():
limiter = RateLimiter(rate_limit=1)
now = monotonic.monotonic()
with mock.patch('ddtrace.vendor.monotonic.monotonic') as mock_time:
mock_time.return_value = now
# Default values
assert limiter.current_window == 0
assert limiter.prev_window_rate is None
# Accessing the effective rate doesn't change anything
assert limiter.effective_rate == 1.0
assert limiter.current_window == 0
assert limiter.prev_window_rate is None
# Calling `.is_allowed()` updates the values
assert limiter.is_allowed() is True
assert limiter.effective_rate == 1.0
assert limiter.current_window == now
assert limiter.prev_window_rate is None
# Gap of 0.9999 seconds, same window
mock_time.return_value = now + 0.9999
assert limiter.is_allowed() is False
# DEV: We have rate_limit=1 set
assert limiter.effective_rate == 0.5
assert limiter.current_window == now
assert limiter.prev_window_rate is None
# Gap of 1.0 seconds, new window
mock_time.return_value = now + 1.0
assert limiter.is_allowed() is True
assert limiter.effective_rate == 0.75
assert limiter.current_window == (now + 1.0)
assert limiter.prev_window_rate == 0.5
# Gap of 1.9999 seconds, same window
mock_time.return_value = now + 1.9999
assert limiter.is_allowed() is False
assert limiter.effective_rate == 0.5
assert limiter.current_window == (now + 1.0) # Same as old window
assert limiter.prev_window_rate == 0.5
# Large gap of 100 seconds, new window
mock_time.return_value = now + 100.0
assert limiter.is_allowed() is True
assert limiter.effective_rate == 0.75
assert limiter.current_window == (now + 100.0)
assert limiter.prev_window_rate == 0.5
def test_rate_limiter_is_allowed_large_gap():
limiter = RateLimiter(rate_limit=100)
# Start time
now = monotonic.monotonic()
with mock.patch('ddtrace.vendor.monotonic.monotonic') as mock_time:
# Keep the same timeframe
mock_time.return_value = now
for _ in range(100):
assert limiter.is_allowed() is True
# Large gap before next call to `is_allowed()`
with mock.patch('ddtrace.vendor.monotonic.monotonic') as mock_time:
mock_time.return_value = now + 100
for _ in range(100):
assert limiter.is_allowed() is True
def test_worker_http_error_logging(self):
# Tests the logging http error logic
tracer = self.tracer
self.tracer.writer.api = FlawedAPI(Tracer.DEFAULT_HOSTNAME,
Tracer.DEFAULT_PORT)
tracer.trace('client.testing').finish()
log = logging.getLogger('ddtrace.internal.writer')
log_handler = MockedLogHandler(level='DEBUG')
log.addHandler(log_handler)
self._wait_thread_flush()
assert tracer.writer._last_error_ts < monotonic.monotonic()
logged_errors = log_handler.messages['error']
assert len(logged_errors) == 1
assert 'Failed to send traces to Datadog Agent at http://localhost:8126: ' \
'HTTP error status 400, reason Bad Request, message Content-Type:' \
in logged_errors[0]
def test_rate_limiter_is_allowed(rate_limit):
limiter = RateLimiter(rate_limit=rate_limit)
def check_limit():
# Up to the allowed limit is allowed
for _ in range(rate_limit):
assert limiter.is_allowed() is True
# Any over the limit is disallowed
for _ in range(1000):
assert limiter.is_allowed() is False
# Start time
now = monotonic.monotonic()
# Check the limit for 5 time frames
for i in range(5):
with mock.patch('ddtrace.vendor.monotonic.monotonic') as mock_time:
# Keep the same timeframe
mock_time.return_value = now + i
check_limit()
def test_rate_limiter_init():
limiter = RateLimiter(rate_limit=100)
assert limiter.rate_limit == 100
assert limiter.tokens == 100
assert limiter.max_tokens == 100
assert limiter.last_update <= monotonic.monotonic()
