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"""WSGI-related types for static type checking"""
from collections.abc import Callable, Iterable, Iterator
from types import TracebackType
from typing import Any, Protocol, TypeAlias
__all__ = [
"StartResponse",
"WSGIEnvironment",
"WSGIApplication",
"InputStream",
"ErrorStream",
"FileWrapper",
]
_ExcInfo: TypeAlias = tuple[type[BaseException], BaseException, TracebackType]
_OptExcInfo: TypeAlias = _ExcInfo | tuple[None, None, None]
class StartResponse(Protocol):
"""start_response() callable as defined in PEP 3333"""
def __call__(
self,
status: str,
headers: list[tuple[str, str]],
exc_info: _OptExcInfo | None = ...,
/,
) -> Callable[[bytes], object]: ...
WSGIEnvironment: TypeAlias = dict[str, Any]
WSGIApplication: TypeAlias = Callable[[WSGIEnvironment, StartResponse],
Iterable[bytes]]
class InputStream(Protocol):
"""WSGI input stream as defined in PEP 3333"""
def read(self, size: int = ..., /) -> bytes: ...
def readline(self, size: int = ..., /) -> bytes: ...
def readlines(self, hint: int = ..., /) -> list[bytes]: ...
def __iter__(self) -> Iterator[bytes]: ...
class ErrorStream(Protocol):
"""WSGI error stream as defined in PEP 3333"""
def flush(self) -> object: ...
def write(self, s: str, /) -> object: ...
def writelines(self, seq: list[str], /) -> object: ...
class _Readable(Protocol):
def read(self, size: int = ..., /) -> bytes: ...
# Optional: def close(self) -> object: ...
class FileWrapper(Protocol):
"""WSGI file wrapper as defined in PEP 3333"""
def __call__(
self, file: _Readable, block_size: int = ..., /,
) -> Iterable[bytes]: ...