129 lines
3.6 KiB
Python
129 lines
3.6 KiB
Python
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try:
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from errno import EBADF
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except ImportError:
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EBADF = 9
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from io import TextIOWrapper
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class cancel_wait_ex(IOError):
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def __init__(self):
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super(cancel_wait_ex, self).__init__(
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EBADF, 'File descriptor was closed in another greenlet')
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class FileObjectClosed(IOError):
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def __init__(self):
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super(FileObjectClosed, self).__init__(
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EBADF, 'Bad file descriptor (FileObject was closed)')
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class FileObjectBase(object):
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"""
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Internal base class to ensure a level of consistency
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between FileObjectPosix and FileObjectThread
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"""
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# List of methods we delegate to the wrapping IO object, if they
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# implement them and we do not.
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_delegate_methods = (
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# General methods
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'flush',
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'fileno',
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'writable',
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'readable',
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'seek',
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'seekable',
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'tell',
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# Read
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'read',
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'readline',
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'readlines',
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'read1',
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# Write
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'write',
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'writelines',
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'truncate',
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)
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# Whether we are translating universal newlines or not.
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_translate = False
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def __init__(self, io, closefd):
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"""
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:param io: An io.IOBase-like object.
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"""
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self._io = io
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# We don't actually use this property ourself, but we save it (and
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# pass it along) for compatibility.
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self._close = closefd
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if self._translate:
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# This automatically handles delegation.
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self.translate_newlines(None)
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else:
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self._do_delegate_methods()
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io = property(lambda s: s._io,
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# Historically we either hand-wrote all the delegation methods
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# to use self.io, or we simply used __getattr__ to look them up at
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# runtime. This meant people could change the io attribute on the fly
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# and it would mostly work (subprocess.py used to do that). We don't recommend
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# that, but we still support it.
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lambda s, nv: setattr(s, '_io', nv) or s._do_delegate_methods())
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def _do_delegate_methods(self):
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for meth_name in self._delegate_methods:
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meth = getattr(self._io, meth_name, None)
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implemented_by_class = hasattr(type(self), meth_name)
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if meth and not implemented_by_class:
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setattr(self, meth_name, self._wrap_method(meth))
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elif hasattr(self, meth_name) and not implemented_by_class:
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delattr(self, meth_name)
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def _wrap_method(self, method):
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"""
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Wrap a method we're copying into our dictionary from the underlying
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io object to do something special or different, if necessary.
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"""
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return method
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def translate_newlines(self, mode, *text_args, **text_kwargs):
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wrapper = TextIOWrapper(self._io, *text_args, **text_kwargs)
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if mode:
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wrapper.mode = mode
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self.io = wrapper
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self._translate = True
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@property
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def closed(self):
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"""True if the file is closed"""
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return self._io is None
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def close(self):
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if self._io is None:
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return
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io = self._io
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self._io = None
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self._do_close(io, self._close)
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def _do_close(self, fobj, closefd):
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raise NotImplementedError()
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def __getattr__(self, name):
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if self._io is None:
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raise FileObjectClosed()
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return getattr(self._io, name)
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def __repr__(self):
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return '<%s _fobj=%r%s>' % (self.__class__.__name__, self.io, self._extra_repr())
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def _extra_repr(self):
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return ''
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