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import gc
import sys
import time
from celery.utils.dispatch import Signal
if sys.platform.startswith('java'):
def garbage_collect():
# Some JVM GCs will execute finalizers in a different thread, meaning
# we need to wait for that to complete before we go on looking for the
# effects of that.
gc.collect()
time.sleep(0.1)
elif hasattr(sys, 'pypy_version_info'):
def garbage_collect():
# Collecting weakreferences can take two collections on PyPy.
gc.collect()
gc.collect()
else:
def garbage_collect():
gc.collect()
def receiver_1_arg(val, **kwargs):
return val
class Callable:
def __call__(self, val, **kwargs):
return val
def a(self, val, **kwargs):
return val
a_signal = Signal(providing_args=['val'], use_caching=False)
class test_Signal:
"""Test suite for dispatcher (barely started)"""
def _testIsClean(self, signal):
"""Assert that everything has been cleaned up automatically"""
assert not signal.has_listeners()
assert signal.receivers == []
def test_exact(self):
a_signal.connect(receiver_1_arg, sender=self)
try:
expected = [(receiver_1_arg, 'test')]
result = a_signal.send(sender=self, val='test')
assert result == expected
finally:
a_signal.disconnect(receiver_1_arg, sender=self)
self._testIsClean(a_signal)
def test_ignored_sender(self):
a_signal.connect(receiver_1_arg)
try:
expected = [(receiver_1_arg, 'test')]
result = a_signal.send(sender=self, val='test')
assert result == expected
finally:
a_signal.disconnect(receiver_1_arg)
self._testIsClean(a_signal)
def test_garbage_collected(self):
a = Callable()
a_signal.connect(a.a, sender=self)
expected = []
del a
garbage_collect()
result = a_signal.send(sender=self, val='test')
assert result == expected
self._testIsClean(a_signal)
def test_multiple_registration(self):
a = Callable()
result = None
try:
a_signal.connect(a)
a_signal.connect(a)
a_signal.connect(a)
a_signal.connect(a)
a_signal.connect(a)
a_signal.connect(a)
result = a_signal.send(sender=self, val='test')
assert len(result) == 1
assert len(a_signal.receivers) == 1
finally:
del a
del result
garbage_collect()
self._testIsClean(a_signal)
def test_uid_registration(self):
def uid_based_receiver_1(**kwargs):
pass
def uid_based_receiver_2(**kwargs):
pass
a_signal.connect(uid_based_receiver_1, dispatch_uid='uid')
try:
a_signal.connect(uid_based_receiver_2, dispatch_uid='uid')
assert len(a_signal.receivers) == 1
finally:
a_signal.disconnect(dispatch_uid='uid')
self._testIsClean(a_signal)
def test_robust(self):
def fails(val, **kwargs):
raise ValueError('this')
a_signal.connect(fails)
try:
a_signal.send(sender=self, val='test')
finally:
a_signal.disconnect(fails)
self._testIsClean(a_signal)
def test_disconnection(self):
receiver_1 = Callable()
receiver_2 = Callable()
receiver_3 = Callable()
try:
try:
a_signal.connect(receiver_1)
a_signal.connect(receiver_2)
a_signal.connect(receiver_3)
finally:
a_signal.disconnect(receiver_1)
del receiver_2
garbage_collect()
finally:
a_signal.disconnect(receiver_3)
self._testIsClean(a_signal)
def test_retry(self):
class non_local:
counter = 1
def succeeds_eventually(val, **kwargs):
non_local.counter += 1
if non_local.counter < 3:
raise ValueError('this')
return val
a_signal.connect(succeeds_eventually, sender=self, retry=True)
try:
result = a_signal.send(sender=self, val='test')
assert non_local.counter == 3
assert result[0][1] == 'test'
finally:
a_signal.disconnect(succeeds_eventually, sender=self)
self._testIsClean(a_signal)
def test_retry_with_dispatch_uid(self):
uid = 'abc123'
a_signal.connect(receiver_1_arg, sender=self, retry=True,
dispatch_uid=uid)
assert a_signal.receivers[0][0][0] == uid
a_signal.disconnect(receiver_1_arg, sender=self, dispatch_uid=uid)
self._testIsClean(a_signal)
def test_boundmethod(self):
a = Callable()
a_signal.connect(a.a, sender=self)
expected = [(a.a, 'test')]
garbage_collect()
result = a_signal.send(sender=self, val='test')
assert result == expected
del a, result, expected
garbage_collect()
self._testIsClean(a_signal)
def test_disconnect_retryable_decorator(self):
# Regression test for https://github.com/celery/celery/issues/9119
@a_signal.connect(sender=self, retry=True)
def succeeds_eventually(val, **kwargs):
return val
try:
a_signal.send(sender=self, val='test')
finally:
a_signal.disconnect(succeeds_eventually, sender=self)
self._testIsClean(a_signal)
|
