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from __future__ import annotations
import sys
import typing
if sys.version_info >= (3, 10): # pragma: no cover
from typing import ParamSpec
else: # pragma: no cover
from typing_extensions import ParamSpec
from starlette._utils import is_async_callable
from starlette.concurrency import run_in_threadpool
P = ParamSpec("P")
class BackgroundTask:
def __init__(self, func: typing.Callable[P, typing.Any], *args: P.args, **kwargs: P.kwargs) -> None:
self.func = func
self.args = args
self.kwargs = kwargs
self.is_async = is_async_callable(func)
async def __call__(self) -> None:
if self.is_async:
await self.func(*self.args, **self.kwargs)
else:
await run_in_threadpool(self.func, *self.args, **self.kwargs)
class BackgroundTasks(BackgroundTask):
def __init__(self, tasks: typing.Sequence[BackgroundTask] | None = None):
self.tasks = list(tasks) if tasks else []
def add_task(self, func: typing.Callable[P, typing.Any], *args: P.args, **kwargs: P.kwargs) -> None:
task = BackgroundTask(func, *args, **kwargs)
self.tasks.append(task)
async def __call__(self) -> None:
for task in self.tasks:
await task()