43 lines
1.3 KiB
Python
43 lines
1.3 KiB
Python
from __future__ import annotations
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import sys
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from typing import Any, Iterator, Protocol
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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.types import ASGIApp, Receive, Scope, Send
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P = ParamSpec("P")
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class _MiddlewareClass(Protocol[P]):
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def __init__(self, app: ASGIApp, *args: P.args, **kwargs: P.kwargs) -> None: ... # pragma: no cover
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async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None: ... # pragma: no cover
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class Middleware:
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def __init__(
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self,
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cls: type[_MiddlewareClass[P]],
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*args: P.args,
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**kwargs: P.kwargs,
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) -> None:
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self.cls = cls
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self.args = args
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self.kwargs = kwargs
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def __iter__(self) -> Iterator[Any]:
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as_tuple = (self.cls, self.args, self.kwargs)
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return iter(as_tuple)
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def __repr__(self) -> str:
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class_name = self.__class__.__name__
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args_strings = [f"{value!r}" for value in self.args]
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option_strings = [f"{key}={value!r}" for key, value in self.kwargs.items()]
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args_repr = ", ".join([self.cls.__name__] + args_strings + option_strings)
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return f"{class_name}({args_repr})"
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