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44 lines
1.2 KiB
44 lines
1.2 KiB
2 years ago
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import asyncio
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import sys
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import typing
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if sys.version_info >= (3, 10): # pragma: no cover
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from typing import ParamSpec
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else: # pragma: no cover
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from typing_extensions import ParamSpec
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from starlette.concurrency import run_in_threadpool
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P = ParamSpec("P")
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class BackgroundTask:
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def __init__(
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self, func: typing.Callable[P, typing.Any], *args: P.args, **kwargs: P.kwargs
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) -> None:
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self.func = func
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self.args = args
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self.kwargs = kwargs
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self.is_async = asyncio.iscoroutinefunction(func)
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async def __call__(self) -> None:
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if self.is_async:
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await self.func(*self.args, **self.kwargs)
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else:
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await run_in_threadpool(self.func, *self.args, **self.kwargs)
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class BackgroundTasks(BackgroundTask):
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def __init__(self, tasks: typing.Optional[typing.Sequence[BackgroundTask]] = None):
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self.tasks = list(tasks) if tasks else []
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def add_task(
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self, func: typing.Callable[P, typing.Any], *args: P.args, **kwargs: P.kwargs
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) -> None:
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task = BackgroundTask(func, *args, **kwargs)
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self.tasks.append(task)
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async def __call__(self) -> None:
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for task in self.tasks:
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await task()
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