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from collections.abc import Awaitable, Callable
from typing import TypeVar
from returns.interfaces.specific.future import FutureLikeN
from returns.primitives.hkt import Kinded, KindN, kinded
_FirstType = TypeVar('_FirstType')
_SecondType = TypeVar('_SecondType')
_ThirdType = TypeVar('_ThirdType')
_UpdatedType = TypeVar('_UpdatedType')
_FutureKind = TypeVar('_FutureKind', bound=FutureLikeN)
def bind_awaitable(
function: Callable[[_FirstType], Awaitable[_UpdatedType]],
) -> Kinded[
Callable[
[KindN[_FutureKind, _FirstType, _SecondType, _ThirdType]],
KindN[_FutureKind, _UpdatedType, _SecondType, _ThirdType],
]
]:
"""
Composes a container a regular ``async`` function.
This function should return plain, non-container value.
In other words, it modifies the function's
signature from:
``a -> Awaitable[b]``
to:
``Container[a] -> Container[b]``
This is how it should be used:
.. code:: python
>>> import anyio
>>> from returns.future import Future
>>> from returns.io import IO
>>> from returns.pointfree import bind_awaitable
>>> async def coroutine(x: int) -> int:
... return x + 1
>>> assert anyio.run(
... bind_awaitable(coroutine)(Future.from_value(1)).awaitable,
... ) == IO(2)
Note, that this function works
for all containers with ``.bind_awaitable`` method.
See :class:`returns.primitives.interfaces.specific.future.FutureLikeN`
for more info.
"""
@kinded
def factory(
container: KindN[_FutureKind, _FirstType, _SecondType, _ThirdType],
) -> KindN[_FutureKind, _UpdatedType, _SecondType, _ThirdType]:
return container.bind_awaitable(function)
return factory
|
