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import sys
from time import monotonic
from unittest.mock import Mock, patch
import pytest
from celery.concurrency.base import BasePool
from celery.utils.objects import Bunch
from celery.worker import autoscale, state
class MockPool(BasePool):
shrink_raises_exception = False
shrink_raises_ValueError = False
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._pool = Bunch(_processes=self.limit)
def grow(self, n=1):
self._pool._processes += n
def shrink(self, n=1):
if self.shrink_raises_exception:
raise KeyError('foo')
if self.shrink_raises_ValueError:
raise ValueError('foo')
self._pool._processes -= n
@property
def num_processes(self):
return self._pool._processes
class test_WorkerComponent:
def test_register_with_event_loop(self):
parent = Mock(name='parent')
parent.autoscale = True
parent.consumer.on_task_message = set()
w = autoscale.WorkerComponent(parent)
assert parent.autoscaler is None
assert w.enabled
hub = Mock(name='hub')
w.create(parent)
w.register_with_event_loop(parent, hub)
assert (parent.autoscaler.maybe_scale in
parent.consumer.on_task_message)
hub.call_repeatedly.assert_called_with(
parent.autoscaler.keepalive, parent.autoscaler.maybe_scale,
)
parent.hub = hub
hub.on_init = []
w.instantiate = Mock()
w.register_with_event_loop(parent, Mock(name='loop'))
assert parent.consumer.on_task_message
def test_info_without_event_loop(self):
parent = Mock(name='parent')
parent.autoscale = True
parent.max_concurrency = '10'
parent.min_concurrency = '2'
parent.use_eventloop = False
w = autoscale.WorkerComponent(parent)
w.create(parent)
info = w.info(parent)
assert 'autoscaler' in info
assert parent.autoscaler_cls().info.called
class test_Autoscaler:
def setup_method(self):
self.pool = MockPool(3)
def test_stop(self):
class Scaler(autoscale.Autoscaler):
alive = True
joined = False
def is_alive(self):
return self.alive
def join(self, timeout=None):
self.joined = True
worker = Mock(name='worker')
x = Scaler(self.pool, 10, 3, worker=worker)
# Don't allow thread joining or event waiting to block the test
with patch("threading.Thread.join"), patch("threading.Event.wait"):
x.stop()
assert x.joined
x.joined = False
x.alive = False
with patch("threading.Thread.join"), patch("threading.Event.wait"):
x.stop()
assert not x.joined
@pytest.mark.sleepdeprived_patched_module(autoscale)
def test_body(self, sleepdeprived):
worker = Mock(name='worker')
x = autoscale.Autoscaler(self.pool, 10, 3, worker=worker)
x.body()
assert x.pool.num_processes == 3
_keep = [Mock(name=f'req{i}') for i in range(20)]
[state.task_reserved(m) for m in _keep]
x.body()
x.body()
assert x.pool.num_processes == 10
state.reserved_requests.clear()
x.body()
assert x.pool.num_processes == 10
x._last_scale_up = monotonic() - 10000
x.body()
assert x.pool.num_processes == 3
def test_run(self):
class Scaler(autoscale.Autoscaler):
scale_called = False
def body(self):
self.scale_called = True
getattr(self, "_bgThread__is_shutdown").set()
worker = Mock(name='worker')
x = Scaler(self.pool, 10, 3, worker=worker)
x.run()
assert getattr(x, "_bgThread__is_shutdown").is_set()
assert getattr(x, "_bgThread__is_stopped").is_set()
assert x.scale_called
def test_shrink_raises_exception(self):
worker = Mock(name='worker')
x = autoscale.Autoscaler(self.pool, 10, 3, worker=worker)
x.scale_up(3)
x.pool.shrink_raises_exception = True
x._shrink(1)
@patch('celery.worker.autoscale.debug')
def test_shrink_raises_ValueError(self, debug):
worker = Mock(name='worker')
x = autoscale.Autoscaler(self.pool, 10, 3, worker=worker)
x.scale_up(3)
x._last_scale_up = monotonic() - 10000
x.pool.shrink_raises_ValueError = True
x.scale_down(1)
assert debug.call_count
def test_update(self):
worker = Mock(name='worker')
x = autoscale.Autoscaler(self.pool, 10, 3, worker=worker)
x.worker.consumer.prefetch_multiplier = 1
x.keepalive = -1
assert x.processes == 3
x.scale_up(5)
x.update(7, None)
assert x.processes == 7
assert x.max_concurrency == 7
x.scale_down(4)
x.update(None, 6)
assert x.processes == 6
assert x.min_concurrency == 6
x.update(max=300, min=10)
x.update(max=300, min=2)
x.update(max=None, min=None)
def test_prefetch_count_on_updates(self):
worker = Mock(name='worker')
x = autoscale.Autoscaler(self.pool, 10, 3, worker=worker)
x.worker.consumer.prefetch_multiplier = 1
x.update(5, None)
worker.consumer._update_prefetch_count.assert_called_with(-5)
x.update(15, 7)
worker.consumer._update_prefetch_count.assert_called_with(10)
def test_prefetch_count_on_updates_prefetch_multiplier_gt_one(self):
worker = Mock(name='worker')
x = autoscale.Autoscaler(self.pool, 10, 3, worker=worker)
x.worker.consumer.prefetch_multiplier = 4
x.update(5, None)
worker.consumer._update_prefetch_count.assert_called_with(-5)
x.update(15, 7)
worker.consumer._update_prefetch_count.assert_called_with(10)
def test_info(self):
worker = Mock(name='worker')
x = autoscale.Autoscaler(self.pool, 10, 3, worker=worker)
info = x.info()
assert info['max'] == 10
assert info['min'] == 3
assert info['current'] == 3
@patch('os._exit')
def test_thread_crash(self, _exit):
class _Autoscaler(autoscale.Autoscaler):
def body(self):
getattr(self, "_bgThread__is_shutdown").set()
raise OSError('foo')
worker = Mock(name='worker')
x = _Autoscaler(self.pool, 10, 3, worker=worker)
stderr = Mock()
p, sys.stderr = sys.stderr, stderr
try:
x.run()
finally:
sys.stderr = p
_exit.assert_called_with(1)
stderr.write.assert_called()
@pytest.mark.sleepdeprived_patched_module(autoscale)
def test_no_negative_scale(self, sleepdeprived):
total_num_processes = []
worker = Mock(name='worker')
x = autoscale.Autoscaler(self.pool, 10, 3, worker=worker)
x.body() # the body func scales up or down
_keep = [Mock(name=f'req{i}') for i in range(35)]
for req in _keep:
state.task_reserved(req)
x.body()
total_num_processes.append(self.pool.num_processes)
for req in _keep:
state.task_ready(req)
x.body()
total_num_processes.append(self.pool.num_processes)
assert all(x.min_concurrency <= i <= x.max_concurrency
for i in total_num_processes)
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