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248 lines
8.3 KiB
Python
248 lines
8.3 KiB
Python
import gc
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import sys
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import weakref
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from types import TracebackType
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from django.dispatch import Signal, receiver
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from django.test import SimpleTestCase
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from django.test.utils import override_settings
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if hasattr(sys, 'pypy_version_info'):
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def garbage_collect():
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# Collecting weakreferences can take two collections on PyPy.
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gc.collect()
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gc.collect()
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else:
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def garbage_collect():
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gc.collect()
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def receiver_1_arg(val, **kwargs):
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return val
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class Callable:
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def __call__(self, val, **kwargs):
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return val
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def a(self, val, **kwargs):
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return val
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a_signal = Signal()
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b_signal = Signal()
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c_signal = Signal()
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d_signal = Signal(use_caching=True)
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class DispatcherTests(SimpleTestCase):
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def assertTestIsClean(self, signal):
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"""Assert that everything has been cleaned up automatically"""
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# Note that dead weakref cleanup happens as side effect of using
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# the signal's receivers through the signals API. So, first do a
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# call to an API method to force cleanup.
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self.assertFalse(signal.has_listeners())
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self.assertEqual(signal.receivers, [])
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@override_settings(DEBUG=True)
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def test_cannot_connect_no_kwargs(self):
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def receiver_no_kwargs(sender):
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pass
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msg = 'Signal receivers must accept keyword arguments (**kwargs).'
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with self.assertRaisesMessage(ValueError, msg):
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a_signal.connect(receiver_no_kwargs)
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self.assertTestIsClean(a_signal)
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@override_settings(DEBUG=True)
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def test_cannot_connect_non_callable(self):
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msg = 'Signal receivers must be callable.'
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with self.assertRaisesMessage(AssertionError, msg):
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a_signal.connect(object())
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self.assertTestIsClean(a_signal)
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def test_send(self):
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a_signal.connect(receiver_1_arg, sender=self)
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result = a_signal.send(sender=self, val='test')
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self.assertEqual(result, [(receiver_1_arg, 'test')])
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a_signal.disconnect(receiver_1_arg, sender=self)
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self.assertTestIsClean(a_signal)
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def test_send_no_receivers(self):
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result = a_signal.send(sender=self, val='test')
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self.assertEqual(result, [])
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def test_send_connected_no_sender(self):
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a_signal.connect(receiver_1_arg)
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result = a_signal.send(sender=self, val='test')
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self.assertEqual(result, [(receiver_1_arg, 'test')])
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a_signal.disconnect(receiver_1_arg)
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self.assertTestIsClean(a_signal)
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def test_send_different_no_sender(self):
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a_signal.connect(receiver_1_arg, sender=object)
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result = a_signal.send(sender=self, val='test')
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self.assertEqual(result, [])
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a_signal.disconnect(receiver_1_arg, sender=object)
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self.assertTestIsClean(a_signal)
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def test_garbage_collected(self):
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a = Callable()
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a_signal.connect(a.a, sender=self)
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del a
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garbage_collect()
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result = a_signal.send(sender=self, val="test")
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self.assertEqual(result, [])
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self.assertTestIsClean(a_signal)
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def test_cached_garbaged_collected(self):
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"""
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Make sure signal caching sender receivers don't prevent garbage
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collection of senders.
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"""
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class sender:
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pass
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wref = weakref.ref(sender)
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d_signal.connect(receiver_1_arg)
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d_signal.send(sender, val='garbage')
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del sender
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garbage_collect()
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try:
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self.assertIsNone(wref())
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finally:
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# Disconnect after reference check since it flushes the tested cache.
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d_signal.disconnect(receiver_1_arg)
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def test_multiple_registration(self):
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a = Callable()
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a_signal.connect(a)
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a_signal.connect(a)
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a_signal.connect(a)
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a_signal.connect(a)
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a_signal.connect(a)
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a_signal.connect(a)
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result = a_signal.send(sender=self, val="test")
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self.assertEqual(len(result), 1)
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self.assertEqual(len(a_signal.receivers), 1)
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del a
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del result
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garbage_collect()
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self.assertTestIsClean(a_signal)
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def test_uid_registration(self):
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def uid_based_receiver_1(**kwargs):
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pass
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def uid_based_receiver_2(**kwargs):
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pass
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a_signal.connect(uid_based_receiver_1, dispatch_uid="uid")
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a_signal.connect(uid_based_receiver_2, dispatch_uid="uid")
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self.assertEqual(len(a_signal.receivers), 1)
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a_signal.disconnect(dispatch_uid="uid")
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self.assertTestIsClean(a_signal)
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def test_send_robust_success(self):
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a_signal.connect(receiver_1_arg)
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result = a_signal.send_robust(sender=self, val='test')
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self.assertEqual(result, [(receiver_1_arg, 'test')])
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a_signal.disconnect(receiver_1_arg)
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self.assertTestIsClean(a_signal)
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def test_send_robust_no_receivers(self):
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result = a_signal.send_robust(sender=self, val='test')
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self.assertEqual(result, [])
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def test_send_robust_ignored_sender(self):
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a_signal.connect(receiver_1_arg)
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result = a_signal.send_robust(sender=self, val='test')
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self.assertEqual(result, [(receiver_1_arg, 'test')])
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a_signal.disconnect(receiver_1_arg)
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self.assertTestIsClean(a_signal)
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def test_send_robust_fail(self):
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def fails(val, **kwargs):
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raise ValueError('this')
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a_signal.connect(fails)
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try:
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with self.assertLogs('django.dispatch', 'ERROR') as cm:
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result = a_signal.send_robust(sender=self, val='test')
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err = result[0][1]
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self.assertIsInstance(err, ValueError)
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self.assertEqual(err.args, ('this',))
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self.assertIs(hasattr(err, '__traceback__'), True)
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self.assertIsInstance(err.__traceback__, TracebackType)
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log_record = cm.records[0]
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self.assertEqual(
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log_record.getMessage(),
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'Error calling '
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'DispatcherTests.test_send_robust_fail.<locals>.fails in '
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'Signal.send_robust() (this)',
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)
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self.assertIsNotNone(log_record.exc_info)
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_, exc_value, _ = log_record.exc_info
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self.assertIsInstance(exc_value, ValueError)
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self.assertEqual(str(exc_value), 'this')
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finally:
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a_signal.disconnect(fails)
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self.assertTestIsClean(a_signal)
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def test_disconnection(self):
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receiver_1 = Callable()
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receiver_2 = Callable()
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receiver_3 = Callable()
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a_signal.connect(receiver_1)
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a_signal.connect(receiver_2)
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a_signal.connect(receiver_3)
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a_signal.disconnect(receiver_1)
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del receiver_2
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garbage_collect()
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a_signal.disconnect(receiver_3)
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self.assertTestIsClean(a_signal)
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def test_values_returned_by_disconnection(self):
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receiver_1 = Callable()
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receiver_2 = Callable()
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a_signal.connect(receiver_1)
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receiver_1_disconnected = a_signal.disconnect(receiver_1)
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receiver_2_disconnected = a_signal.disconnect(receiver_2)
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self.assertTrue(receiver_1_disconnected)
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self.assertFalse(receiver_2_disconnected)
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self.assertTestIsClean(a_signal)
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def test_has_listeners(self):
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self.assertFalse(a_signal.has_listeners())
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self.assertFalse(a_signal.has_listeners(sender=object()))
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receiver_1 = Callable()
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a_signal.connect(receiver_1)
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self.assertTrue(a_signal.has_listeners())
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self.assertTrue(a_signal.has_listeners(sender=object()))
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a_signal.disconnect(receiver_1)
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self.assertFalse(a_signal.has_listeners())
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self.assertFalse(a_signal.has_listeners(sender=object()))
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class ReceiverTestCase(SimpleTestCase):
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def test_receiver_single_signal(self):
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@receiver(a_signal)
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def f(val, **kwargs):
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self.state = val
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self.state = False
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a_signal.send(sender=self, val=True)
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self.assertTrue(self.state)
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def test_receiver_signal_list(self):
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@receiver([a_signal, b_signal, c_signal])
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def f(val, **kwargs):
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self.state.append(val)
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self.state = []
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a_signal.send(sender=self, val='a')
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c_signal.send(sender=self, val='c')
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b_signal.send(sender=self, val='b')
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self.assertIn('a', self.state)
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self.assertIn('b', self.state)
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self.assertIn('c', self.state)
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