def test_inactivity_should_not_corrupt_sampling_state():
class Clock(object):
def __init__(self, time):
self._time = time
def __call__(self):
return self._time
def add_millis(self, millis):
self._time += 0.001 * millis
def add_hours(self, hours):
self._time += 60 * 60 * hours
with mock.patch(
'uwsgi_metrics.reservoir.Reservoir.current_time_in_fractional_seconds',
Clock(42.0)) as clock:
reservoir = Reservoir('unit', size=10, alpha=0.015)
# Add 1000 values at a rate of 10 values/second
for i in xrange(1000):
reservoir.update(1000 + i)
clock.add_millis(100)
assert reservoir.get_snapshot().size() == 10
assert_all_values_between(reservoir, 1000, 2000)
# Wait for 15 hours and add another value. This should trigger a
# rescale. Note that the number of samples will be reduced to 2
# because of the very small scaling factor that will make all
# existing priorities equal to zero after rescale.
clock.add_hours(15)
reservoir.update(2000)
reservoir.get_snapshot().size() == 2
assert_all_values_between(reservoir, 1000, 3000)
def test_inactivity_should_not_corrupt_sampling_state():
class Clock(object):
def __init__(self, time):
self._time = time
def __call__(self):
return self._time
def add_millis(self, millis):
self._time += 0.001 * millis
def add_hours(self, hours):
self._time += 60 * 60 * hours
with mock.patch('uwsgi_metrics.reservoir.Reservoir.current_time_in_fractional_seconds',
Clock(42.0)) as clock:
reservoir = Reservoir('unit', size=10, alpha=0.015)
# Add 1000 values at a rate of 10 values/second
for i in xrange(1000):
reservoir.update(1000 + i)
clock.add_millis(100)
assert reservoir.get_snapshot().size() == 10
assert_all_values_between(reservoir, 1000, 2000)
# Wait for 15 hours and add another value. This should trigger a
# rescale. Note that the number of samples will be reduced to 2
# because of the very small scaling factor that will make all
# existing priorities equal to zero after rescale.
clock.add_hours(15)
reservoir.update(2000)
reservoir.get_snapshot().size() == 2
assert_all_values_between(reservoir, 1000, 3000)
def test_insert_100_elemnts_into_a_heavily_baised_reservoir_of_1000():
reservoir = Reservoir('unit', size=1000, alpha=0.01)
for i in xrange(100):
reservoir.update(i)
assert reservoir.get_snapshot().size() == 100
assert_all_values_between(reservoir, 0, 100)
def test_insert_100_elemnts_into_a_heavily_baised_reservoir_of_1000():
reservoir = Reservoir('unit', size=1000, alpha=0.01)
for i in xrange(100):
reservoir.update(i)
assert reservoir.get_snapshot().size() == 100
assert_all_values_between(reservoir, 0, 100)
def test_insert_10_elements_into_a_reservoir_of_100():
reservoir = Reservoir('unit', size=100, alpha=0.99)
for i in range(10):
reservoir.update(i)
assert reservoir.get_snapshot().size() == 10
assert_all_values_between(reservoir, 0, 10)
class Histogram(object):
"""A metric which calculates the distribution of a value.
Translated from Histogram.java
"""
def __init__(self):
self.count = 0
self.reservoir = Reservoir()
def update(self, value):
self.count += 1
self.reservoir.update(value)
def get_count(self):
return self.count
def get_snapshot(self):
return self.reservoir.get_snapshot()
def view(self):
result = self.get_snapshot().view()
result['count'] = self.get_count()
return result
class Histogram(object):
"""A metric which calculates the distribution of a value.
Translated from Histogram.java
"""
def __init__(self):
self.count = 0
self.reservoir = Reservoir()
def update(self, value):
self.count += 1
self.reservoir.update(value)
def get_count(self):
return self.count
def get_snapshot(self):
return self.reservoir.get_snapshot()
def view(self):
result = self.get_snapshot().view()
result['count'] = self.get_count()
return result