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- 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.Optional[typing.Sequence[BackgroundTask]] = 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()
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