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from copy import deepcopy
from typing import TypeVar
from django.utils import timezone
from typing_extensions import ParamSpec
from django_tasks.base import Task, TaskResult, TaskResultStatus
from django_tasks.exceptions import TaskResultDoesNotExist
from django_tasks.signals import task_enqueued
from django_tasks.utils import get_random_id
from .base import BaseTaskBackend
T = TypeVar("T")
P = ParamSpec("P")
class DummyBackend(BaseTaskBackend):
supports_defer = True
supports_async_task = True
supports_priority = True
results: list[TaskResult]
def __init__(self, alias: str, params: dict) -> None:
super().__init__(alias, params)
self.results = []
def enqueue(
self,
task: Task[P, T],
args: P.args, # type:ignore[valid-type]
kwargs: P.kwargs, # type:ignore[valid-type]
) -> TaskResult[T]:
self.validate_task(task)
result: TaskResult[T] = TaskResult(
task=task,
id=get_random_id(),
status=TaskResultStatus.READY,
enqueued_at=timezone.now(),
started_at=None,
last_attempted_at=None,
finished_at=None,
args=args,
kwargs=kwargs,
backend=self.alias,
errors=[],
worker_ids=[],
)
self.results.append(result)
task_enqueued.send(type(self), task_result=result)
# Copy the task to prevent mutation issues
return deepcopy(result)
# We don't set `supports_get_result` as the results are scoped to the current thread
def get_result(self, result_id: str) -> TaskResult:
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: str) -> TaskResult:
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) -> None:
self.results.clear()
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