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Add Concatenate to Paramspec so that Class Methods get correctly defined #639

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Add Concatenate to Paramspec so that Class Methods get correctly defined #639

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0463274
Add Concatenate to Paramspec so that Class Methods get correctly defined
Vizonex Jan 24, 2025
e0a41df
Merge branch 'paramspec' into patch-3
Dreamsorcerer Feb 1, 2025
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37 changes: 16 additions & 21 deletions async_lru/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,29 +22,25 @@
)


if sys.version_info >= (3, 10):
from typing import ParamSpec
else:
from typing_extensions import ParamSpec


if sys.version_info >= (3, 11):
from typing import Self
from typing import Self, ParamSpec, Concatenate
else:
from typing_extensions import Self
from typing_extensions import Self, ParamSpec, Concatenate


__version__ = "2.0.4"

__all__ = ("alru_cache",)


_P = ParamSpec("_P")
_T = TypeVar("_T")
_R = TypeVar("_R")
_P = ParamSpec("_P")

_Coro = Coroutine[Any, Any, _R]
_CB = Callable[_P, _Coro[_R]]
_CBP = Union[_CB[_P, _R], "partial[_Coro[_R]]", "partialmethod[_Coro[_R]]"]
_CBM = Union[_CB[_P, _R], _CB[Concatenate[Self, _P], _R]]
_CBP = Union[_CBM[_P, _R], "partial[_Coro[_R]]", "partialmethod[_Coro[_R]]"]


@final
Expand Down Expand Up @@ -214,7 +210,7 @@ async def __call__(self, /, *fn_args: _P.args, **fn_kwargs: _P.kwargs) -> _R:

fut = loop.create_future()
coro = self.__wrapped__(*fn_args, **fn_kwargs)
task = loop.create_task(coro)
task: asyncio.Task[_R] = loop.create_task(coro)
self.__tasks.add(task)
task.add_done_callback(partial(self._task_done_callback, fut, key))

Expand All @@ -229,18 +225,18 @@ async def __call__(self, /, *fn_args: _P.args, **fn_kwargs: _P.kwargs) -> _R:

def __get__(
self, instance: _T, owner: Optional[Type[_T]]
) -> Union[Self, "_LRUCacheWrapperInstanceMethod[_P, _R, _T]"]:
) -> Union[Self, "_LRUCacheWrapperInstanceMethod[_R, _T]"]:
if owner is None:
return self
else:
return _LRUCacheWrapperInstanceMethod(self, instance)


@final
class _LRUCacheWrapperInstanceMethod(Generic[_P, _R, _T]):
class _LRUCacheWrapperInstanceMethod(Generic[_R, _T]):
def __init__(
self,
wrapper: _LRUCacheWrapper[_P, _R],
wrapper: _LRUCacheWrapper[Concatenate[Self, _P] , _R],
instance: _T,
) -> None:
try:
Expand Down Expand Up @@ -292,15 +288,15 @@ def cache_parameters(self) -> _CacheParameters:
return self.__wrapper.cache_parameters()

async def __call__(self, /, *fn_args: _P.args, **fn_kwargs: _P.kwargs) -> _R:
return await self.__wrapper(self.__instance, *fn_args, **fn_kwargs) # type: ignore[arg-type]
return await self.__wrapper(self.__instance, *fn_args, **fn_kwargs)


def _make_wrapper(
maxsize: Optional[int],
typed: bool,
ttl: Optional[float] = None,
) -> Callable[[_CBP[_P, _R]], _LRUCacheWrapper[_P, _R]]:
def wrapper(fn: _CBP[_P, _R]) -> _LRUCacheWrapper[_P, _R]:
) -> Callable[[_CBP[_P, _R]], _LRUCacheWrapper[_R]]:
def wrapper(fn: _CBP[_P, _R]) -> _LRUCacheWrapper[_R]:
origin = fn

while isinstance(origin, (partial, partialmethod)):
Expand Down Expand Up @@ -341,15 +337,14 @@ def alru_cache(
typed: bool = False,
*,
ttl: Optional[float] = None,
) -> Union[
Callable[[_CBP[_P, _R]], _LRUCacheWrapper[_P, _R]], _LRUCacheWrapper[_P, _R]
]:
) -> Union[Callable[..., _CBP[_P, _R]], _LRUCacheWrapper[_R], _LRUCacheWrapper[_R]]:
if maxsize is None or isinstance(maxsize, int):
return _make_wrapper(maxsize, typed, ttl)
else:
fn = maxsize
fn = cast(_CB[_P, _R], maxsize)

if callable(fn) or hasattr(fn, "_make_unbound_method"):
return _make_wrapper(128, False, None)(fn)

raise NotImplementedError(f"{fn!r} decorating is not supported")

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