def test_tasks_update_due_at_with_backoff(self):
"""The task updates its due_at with a quadratic growing delay if
retry_backoff is true.
"""
base_due_at = datetime.datetime(2018, 11, 28, hour=20, tzinfo=timezone.utc)
task = Task()
task.due_at = base_due_at
task.retry_delay = datetime.timedelta(seconds=10)
task.retry_backoff = True
task.function_name = "tests.fixtures.do_nothing"
task.save()
self.assertEqual(task.due_at, base_due_at)
previous_due_at = task.due_at
for i in range(1, 4):
task.retries = i
before = timezone.now()
task.update_due_at_after_failure()
after = timezone.now()
delta = datetime.timedelta(seconds=10 * (2 ** (i - 1)))
self.assertGreaterEqual(task.due_at, before + delta)
self.assertLessEqual(task.due_at, after + delta)
self.assertGreater(task.due_at, previous_due_at)
previous_due_at = task.due_at
def test_tasks_update_due_at_simple(self):
"""The task updates its due_at after an execution failure."""
base_due_at = datetime.datetime(2018, 11, 28, hour=20, tzinfo=timezone.utc)
task = Task()
task.due_at = base_due_at
task.retry_delay = datetime.timedelta(seconds=10)
task.function_name = "tests.fixtures.do_nothing"
task.save()
self.assertEqual(task.due_at, base_due_at)
previous_due_at = task.due_at
for i in range(1, 4):
task.retries = i
before = timezone.now()
task.update_due_at_after_failure()
after = timezone.now()
delta = datetime.timedelta(seconds=10)
self.assertGreaterEqual(task.due_at, before + delta)
self.assertLessEqual(task.due_at, after + delta)
self.assertGreater(task.due_at, previous_due_at)
previous_due_at = task.due_at
def test_tasks_update_due_at_ignores_backoff_factor_if_backoff_false(self):
"""The task updates its due_at without taking into account its
retry_backoff_factor if retry_backoff is False.
"""
base_due_at = datetime.datetime(2018, 11, 28, hour=20, tzinfo=timezone.utc)
task = Task()
task.due_at = base_due_at
task.retry_delay = datetime.timedelta(seconds=10)
task.retry_backoff = False
task.retry_backoff_factor = 4
task.function_name = "tests.fixtures.do_nothing"
task.save()
self.assertEqual(task.due_at, base_due_at)
for i in range(1, 4):
task.retries = i
before = timezone.now()
task.update_due_at_after_failure()
after = timezone.now()
delta = datetime.timedelta(seconds=10)
self.assertGreaterEqual(task.due_at, before + delta)
self.assertLessEqual(task.due_at, after + delta)