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import logging
from unittest import mock
from django.tasks import default_task_backend, task_backends
from django.tasks.backends.base import BaseTaskBackend
from django.tasks.exceptions import InvalidTask
from django.test import SimpleTestCase, override_settings
from . import tasks as test_tasks
class CustomBackend(BaseTaskBackend):
def __init__(self, alias, params):
super().__init__(alias, params)
self.prefix = self.options.get("prefix", "")
def enqueue(self, *args, **kwargs):
logger = logging.getLogger(__name__)
logger.info(f"{self.prefix}Task enqueued.")
class CustomBackendNoEnqueue(BaseTaskBackend):
pass
@override_settings(
TASKS={
"default": {
"BACKEND": f"{CustomBackend.__module__}.{CustomBackend.__qualname__}",
"OPTIONS": {"prefix": "PREFIX: "},
},
"no_enqueue": {
"BACKEND": f"{CustomBackendNoEnqueue.__module__}."
f"{CustomBackendNoEnqueue.__qualname__}",
},
}
)
class CustomBackendTestCase(SimpleTestCase):
def test_using_correct_backend(self):
self.assertEqual(default_task_backend, task_backends["default"])
self.assertIsInstance(task_backends["default"], CustomBackend)
self.assertEqual(default_task_backend.alias, "default")
self.assertEqual(default_task_backend.options, {"prefix": "PREFIX: "})
@mock.patch.multiple(CustomBackend, supports_async_task=False)
def test_enqueue_async_task_on_non_async_backend(self):
with self.assertRaisesMessage(
InvalidTask, "Backend does not support async Tasks."
):
default_task_backend.validate_task(test_tasks.noop_task_async)
def test_backend_does_not_support_priority(self):
with self.assertRaisesMessage(
InvalidTask, "Backend does not support setting priority of tasks."
):
test_tasks.noop_task.using(priority=10)
def test_options(self):
with self.assertLogs(__name__, level="INFO") as captured_logs:
test_tasks.noop_task.enqueue()
self.assertEqual(len(captured_logs.output), 1)
self.assertIn("PREFIX: Task enqueued", captured_logs.output[0])
def test_no_enqueue(self):
with self.assertRaisesMessage(
TypeError,
"Can't instantiate abstract class CustomBackendNoEnqueue "
"without an implementation for abstract method 'enqueue'",
):
test_tasks.noop_task.using(backend="no_enqueue")
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