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