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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]: ...