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"""create errno-specific classes for IO or os calls.""" from __future__ import annotations import errno import os import sys from typing import Callable from typing import TYPE_CHECKING from typing import TypeVar if TYPE_CHECKING: from typing_extensions import ParamSpec P = ParamSpec("P") R = TypeVar("R") class Error(EnvironmentError): def __repr__(self) -> str: return "{}.{} {!r}: {} ".format( self.__class__.__module__, self.__class__.__name__, self.__class__.__doc__, " ".join(map(str, self.args)), # repr(self.args) ) def __str__(self) -> str: s = "[{}]: {}".format( self.__class__.__doc__, " ".join(map(str, self.args)), ) return s _winerrnomap = { 2: errno.ENOENT, 3: errno.ENOENT, 17: errno.EEXIST, 18: errno.EXDEV, 13: errno.EBUSY, # empty cd drive, but ENOMEDIUM seems unavailiable 22: errno.ENOTDIR, 20: errno.ENOTDIR, 267: errno.ENOTDIR, 5: errno.EACCES, # anything better? } class ErrorMaker: """lazily provides Exception classes for each possible POSIX errno (as defined per the 'errno' module). All such instances subclass EnvironmentError. """ _errno2class: dict[int, type[Error]] = {} def __getattr__(self, name: str) -> type[Error]: if name[0] == "_": raise AttributeError(name) eno = getattr(errno, name) cls = self._geterrnoclass(eno) setattr(self, name, cls) return cls def _geterrnoclass(self, eno: int) -> type[Error]: try: return self._errno2class[eno] except KeyError: clsname = errno.errorcode.get(eno, "UnknownErrno%d" % (eno,)) errorcls = type( clsname, (Error,), {"__module__": "py.error", "__doc__": os.strerror(eno)}, ) self._errno2class[eno] = errorcls return errorcls def checked_call( self, func: Callable[P, R], *args: P.args, **kwargs: P.kwargs ) -> R: """Call a function and raise an errno-exception if applicable.""" __tracebackhide__ = True try: return func(*args, **kwargs) except Error: raise except OSError as value: if not hasattr(value, "errno"): raise errno = value.errno if sys.platform == "win32": try: cls = self._geterrnoclass(_winerrnomap[errno]) except KeyError: raise value else: # we are not on Windows, or we got a proper OSError cls = self._geterrnoclass(errno) raise cls(f"{func.__name__}{args!r}") _error_maker = ErrorMaker() checked_call = _error_maker.checked_call def __getattr__(attr: str) -> type[Error]: return getattr(_error_maker, attr) # type: ignore[no-any-return]