from __future__ import annotations
import sys
from typing import Any, Iterator, Protocol
if sys.version_info >= (3, 10): # pragma: no cover
from typing import ParamSpec
else: # pragma: no cover
from typing_extensions import ParamSpec
from starlette.types import ASGIApp
P = ParamSpec("P")
class _MiddlewareFactory(Protocol[P]):
def __call__(self, app: ASGIApp, *args: P.args, **kwargs: P.kwargs) -> ASGIApp: ... # pragma: no cover
class Middleware:
def __init__(
self,
cls: _MiddlewareFactory[P],
*args: P.args,
**kwargs: P.kwargs,
) -> None:
self.cls = cls
self.args = args
self.kwargs = kwargs
def __iter__(self) -> Iterator[Any]:
as_tuple = (self.cls, self.args, self.kwargs)
return iter(as_tuple)
def __repr__(self) -> str:
class_name = self.__class__.__name__
args_strings = [f"{value!r}" for value in self.args]
option_strings = [f"{key}={value!r}" for key, value in self.kwargs.items()]
name = getattr(self.cls, "__name__", "")
args_repr = ", ".join([name] + args_strings + option_strings)
return f"{class_name}({args_repr})"