76 lines
2.5 KiB
Python
76 lines
2.5 KiB
Python
"""
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The temp module provides a NamedTemporaryFile that can be reopened in the same
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process on any platform. Most platforms use the standard Python
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tempfile.NamedTemporaryFile class, but Windows users are given a custom class.
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This is needed because the Python implementation of NamedTemporaryFile uses the
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O_TEMPORARY flag under Windows, which prevents the file from being reopened
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if the same flag is not provided [1][2]. Note that this does not address the
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more general issue of opening a file for writing and reading in multiple
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processes in a manner that works across platforms.
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Also note that the custom version of NamedTemporaryFile does not support the
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full range of keyword arguments available in Python 2.6+ and 3.0+.
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1: https://mail.python.org/pipermail/python-list/2005-December/336957.html
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2: http://bugs.python.org/issue14243
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"""
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import os
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import tempfile
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from django.core.files.utils import FileProxyMixin
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__all__ = ('NamedTemporaryFile', 'gettempdir',)
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if os.name == 'nt':
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class TemporaryFile(FileProxyMixin):
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"""
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Temporary file object constructor that supports reopening of the
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temporary file in Windows.
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Note that unlike tempfile.NamedTemporaryFile from the standard library,
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__init__() does not support the 'delete' keyword argument in
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Python 2.6+, or the 'delete', 'buffering', 'encoding', or 'newline'
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keyword arguments in Python 3.0+.
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"""
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def __init__(self, mode='w+b', bufsize=-1, suffix='', prefix='', dir=None):
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fd, name = tempfile.mkstemp(suffix=suffix, prefix=prefix, dir=dir)
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self.name = name
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self.file = os.fdopen(fd, mode, bufsize)
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self.close_called = False
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# Because close can be called during shutdown
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# we need to cache os.unlink and access it
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# as self.unlink only
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unlink = os.unlink
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def close(self):
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if not self.close_called:
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self.close_called = True
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try:
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self.file.close()
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except (OSError, IOError):
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pass
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try:
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self.unlink(self.name)
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except (OSError):
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pass
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def __del__(self):
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self.close()
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def __enter__(self):
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self.file.__enter__()
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return self
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def __exit__(self, exc, value, tb):
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self.file.__exit__(exc, value, tb)
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NamedTemporaryFile = TemporaryFile
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else:
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NamedTemporaryFile = tempfile.NamedTemporaryFile
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gettempdir = tempfile.gettempdir
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