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from copy import deepcopy
from django.tasks.base import TaskResult, TaskResultStatus
from django.tasks.exceptions import TaskResultDoesNotExist
from django.tasks.signals import task_enqueued
from django.utils import timezone
from django.utils.crypto import get_random_string
from .base import BaseTaskBackend
class DummyBackend(BaseTaskBackend):
supports_defer = True
supports_async_task = True
supports_priority = True
def __init__(self, alias, params):
super().__init__(alias, params)
self.results = []
def _store_result(self, result):
object.__setattr__(result, "enqueued_at", timezone.now())
self.results.append(result)
task_enqueued.send(type(self), task_result=result)
def enqueue(self, task, args, kwargs):
self.validate_task(task)
result = TaskResult(
task=task,
id=get_random_string(32),
status=TaskResultStatus.READY,
enqueued_at=None,
started_at=None,
last_attempted_at=None,
finished_at=None,
args=args,
kwargs=kwargs,
backend=self.alias,
errors=[],
worker_ids=[],
)
self._store_result(result)
# Copy the task to prevent mutation issues.
return deepcopy(result)
def get_result(self, result_id):
# Results are only scoped to the current thread, hence
# supports_get_result is False.
try:
return next(result for result in self.results if result.id == result_id)
except StopIteration:
raise TaskResultDoesNotExist(result_id) from None
async def aget_result(self, result_id):
try:
return next(result for result in self.results if result.id == result_id)
except StopIteration:
raise TaskResultDoesNotExist(result_id) from None
def clear(self):
self.results.clear()
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