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"""High-level support for working with threads in asyncio
Modified from Python 3.10 stdlib
https://github.com/python/cpython/blob/b11a951f16f0603d98de24fee5c023df83ea552c/Lib/asyncio/threads.py
(the license GPL-compatible but doesn't require to open-source either).
"""
import functools
import contextvars
from asyncio import events
__all__ = ("to_thread",)
async def to_thread(func, /, *args, **kwargs):
"""Asynchronously run function *func* in a separate thread.
Any *args and **kwargs supplied for this function are directly passed
to *func*. Also, the current :class:`contextvars.Context` is propogated,
allowing context variables from the main thread to be accessed in the
separate thread.
Return a coroutine that can be awaited to get the eventual result of *func*
"""
loop = events.get_running_loop()
ctx = contextvars.copy_context()
func_call = functools.partial(ctx.run, func, *args, **kwargs)
return await loop.run_in_executor(None, func_call)
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