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# Source Generated with Decompyle++
# File: in.pyc (Python 2.7)
'''Temporary files.
This module provides generic, low- and high-level interfaces for
creating temporary files and directories. The interfaces listed
as "safe" just below can be used without fear of race conditions.
Those listed as "unsafe" cannot, and are provided for backward
compatibility only.
This module also provides some data items to the user:
TMP_MAX - maximum number of names that will be tried before
giving up.
template - the default prefix for all temporary names.
You may change this to control the default prefix.
tempdir - If this is set to a string before the first use of
any routine from this module, it will be considered as
another candidate location to store temporary files.
'''
__all__ = [
'NamedTemporaryFile',
'TemporaryFile',
'SpooledTemporaryFile',
'mkstemp',
'mkdtemp',
'mktemp',
'TMP_MAX',
'gettempprefix',
'tempdir',
'gettempdir']
import io as _io
import os as _os
import errno as _errno
from random import Random as _Random
try:
from cStringIO import StringIO as _StringIO
except ImportError:
from StringIO import StringIO as _StringIO
try:
import fcntl as _fcntl
except ImportError:
def _set_cloexec(fd):
pass
def _set_cloexec(fd):
try:
flags = _fcntl.fcntl(fd, _fcntl.F_GETFD, 0)
except IOError:
pass
flags |= _fcntl.FD_CLOEXEC
_fcntl.fcntl(fd, _fcntl.F_SETFD, flags)
try:
import thread as _thread
except ImportError:
import dummy_thread as _thread
_allocate_lock = _thread.allocate_lock
_text_openflags = _os.O_RDWR | _os.O_CREAT | _os.O_EXCL
if hasattr(_os, 'O_NOINHERIT'):
_text_openflags |= _os.O_NOINHERIT
if hasattr(_os, 'O_NOFOLLOW'):
_text_openflags |= _os.O_NOFOLLOW
_bin_openflags = _text_openflags
if hasattr(_os, 'O_BINARY'):
_bin_openflags |= _os.O_BINARY
if hasattr(_os, 'TMP_MAX'):
TMP_MAX = _os.TMP_MAX
else:
TMP_MAX = 10000
template = 'tmp'
_once_lock = _allocate_lock()
if hasattr(_os, 'lstat'):
_stat = _os.lstat
elif hasattr(_os, 'stat'):
_stat = _os.stat
else:
def _stat(fn):
try:
f = open(fn)
except IOError:
raise _os.error
f.close()
def _exists(fn):
try:
_stat(fn)
except _os.error:
return False
return True
class _RandomNameSequence:
'''An instance of _RandomNameSequence generates an endless
sequence of unpredictable strings which can safely be incorporated
into file names. Each string is six characters long. Multiple
threads can safely use the same instance at the same time.
_RandomNameSequence is an iterator.'''
characters = 'abcdefghijklmnopqrstuvwxyz' + 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' + '0123456789_'
def __init__(self):
self.mutex = _allocate_lock()
self.normcase = _os.path.normcase
def rng(self):
cur_pid = _os.getpid()
if cur_pid != getattr(self, '_rng_pid', None):
self._rng = _Random()
self._rng_pid = cur_pid
return self._rng
rng = property(rng)
def __iter__(self):
return self
def next(self):
m = self.mutex
c = self.characters
choose = self.rng.choice
m.acquire()
try:
letters = [ choose(c) for dummy in '123456' ]
finally:
m.release()
return self.normcase(''.join(letters))
def _candidate_tempdir_list():
'''Generate a list of candidate temporary directories which
_get_default_tempdir will try.'''
dirlist = []
for envname in ('TMPDIR', 'TEMP', 'TMP'):
dirname = _os.getenv(envname)
if dirname:
dirlist.append(dirname)
continue
if _os.name == 'riscos':
dirname = _os.getenv('Wimp$ScrapDir')
if dirname:
dirlist.append(dirname)
elif _os.name == 'nt':
dirlist.extend([
'c:\\temp',
'c:\\tmp',
'\\temp',
'\\tmp'])
else:
dirlist.extend([
'/tmp',
'/var/tmp',
'/usr/tmp'])
try:
dirlist.append(_os.getcwd())
except (AttributeError, _os.error):
dirlist.append(_os.curdir)
return dirlist
def _get_default_tempdir():
'''Calculate the default directory to use for temporary files.
This routine should be called exactly once.
We determine whether or not a candidate temp dir is usable by
trying to create and write to a file in that directory. If this
is successful, the test file is deleted. To prevent denial of
service, the name of the test file must be randomized.'''
namer = _RandomNameSequence()
dirlist = _candidate_tempdir_list()
flags = _text_openflags
for dir in dirlist:
if dir != _os.curdir:
dir = _os.path.normcase(_os.path.abspath(dir))
for seq in xrange(100):
name = namer.next()
filename = _os.path.join(dir, name)
try:
fd = _os.open(filename, flags, 384)
try:
try:
with _io.open(fd, 'wb', closefd = False) as fp:
fp.write('blat')
finally:
_os.close(fd)
finally:
_os.unlink(filename)
return dir
continue
except (OSError, IOError):
e = None
if e.args[0] != _errno.EEXIST:
break
raise IOError, (_errno.ENOENT, 'No usable temporary directory found in %s' % dirlist)
_name_sequence = None
def _get_candidate_names():
'''Common setup sequence for all user-callable interfaces.'''
global _name_sequence
if _name_sequence is None:
_once_lock.acquire()
try:
if _name_sequence is None:
_name_sequence = _RandomNameSequence()
finally:
_once_lock.release()
return _name_sequence
def _mkstemp_inner(dir, pre, suf, flags):
'''Code common to mkstemp, TemporaryFile, and NamedTemporaryFile.'''
names = _get_candidate_names()
for seq in xrange(TMP_MAX):
name = names.next()
file = _os.path.join(dir, pre + name + suf)
try:
fd = _os.open(file, flags, 384)
_set_cloexec(fd)
return (fd, _os.path.abspath(file))
continue
except OSError:
e = None
if e.errno == _errno.EEXIST:
continue
if _os.name == 'nt' and e.errno == _errno.EACCES:
continue
raise
continue
raise IOError, (_errno.EEXIST, 'No usable temporary file name found')
def gettempprefix():
'''Accessor for tempdir.template.'''
return template
tempdir = None
def gettempdir():
'''Accessor for tempfile.tempdir.'''
global tempdir
if tempdir is None:
_once_lock.acquire()
try:
if tempdir is None:
tempdir = _get_default_tempdir()
finally:
_once_lock.release()
return tempdir
def mkstemp(suffix = '', prefix = template, dir = None, text = False):
"""User-callable function to create and return a unique temporary
file. The return value is a pair (fd, name) where fd is the
file descriptor returned by os.open, and name is the filename.
If 'suffix' is specified, the file name will end with that suffix,
otherwise there will be no suffix.
If 'prefix' is specified, the file name will begin with that prefix,
otherwise a default prefix is used.
If 'dir' is specified, the file will be created in that directory,
otherwise a default directory is used.
If 'text' is specified and true, the file is opened in text
mode. Else (the default) the file is opened in binary mode. On
some operating systems, this makes no difference.
The file is readable and writable only by the creating user ID.
If the operating system uses permission bits to indicate whether a
file is executable, the file is executable by no one. The file
descriptor is not inherited by children of this process.
Caller is responsible for deleting the file when done with it.
"""
if dir is None:
dir = gettempdir()
if text:
flags = _text_openflags
else:
flags = _bin_openflags
return _mkstemp_inner(dir, prefix, suffix, flags)
def mkdtemp(suffix = '', prefix = template, dir = None):
"""User-callable function to create and return a unique temporary
directory. The return value is the pathname of the directory.
Arguments are as for mkstemp, except that the 'text' argument is
not accepted.
The directory is readable, writable, and searchable only by the
creating user.
Caller is responsible for deleting the directory when done with it.
"""
if dir is None:
dir = gettempdir()
names = _get_candidate_names()
for seq in xrange(TMP_MAX):
name = names.next()
file = _os.path.join(dir, prefix + name + suffix)
try:
_os.mkdir(file, 448)
return file
continue
except OSError:
e = None
if e.errno == _errno.EEXIST:
continue
raise
continue
raise IOError, (_errno.EEXIST, 'No usable temporary directory name found')
def mktemp(suffix = '', prefix = template, dir = None):
"""User-callable function to return a unique temporary file name. The
file is not created.
Arguments are as for mkstemp, except that the 'text' argument is
not accepted.
This function is unsafe and should not be used. The file name
refers to a file that did not exist at some point, but by the time
you get around to creating it, someone else may have beaten you to
the punch.
"""
if dir is None:
dir = gettempdir()
names = _get_candidate_names()
for seq in xrange(TMP_MAX):
name = names.next()
file = _os.path.join(dir, prefix + name + suffix)
if not _exists(file):
return file
raise IOError, (_errno.EEXIST, 'No usable temporary filename found')
class _TemporaryFileWrapper:
'''Temporary file wrapper
This class provides a wrapper around files opened for
temporary use. In particular, it seeks to automatically
remove the file when it is no longer needed.
'''
def __init__(self, file, name, delete = True):
self.file = file
self.name = name
self.close_called = False
self.delete = delete
def __getattr__(self, name):
file = self.__dict__['file']
a = getattr(file, name)
if not issubclass(type(a), type(0)):
setattr(self, name, a)
return a
def __enter__(self):
self.file.__enter__()
return self
if _os.name != 'nt':
unlink = _os.unlink
def close(self):
if not self.close_called:
self.close_called = True
self.file.close()
if self.delete:
self.unlink(self.name)
def __del__(self):
self.close()
def __exit__(self, exc, value, tb):
result = self.file.__exit__(exc, value, tb)
self.close()
return result
else:
def __exit__(self, exc, value, tb):
self.file.__exit__(exc, value, tb)
def NamedTemporaryFile(mode = 'w+b', bufsize = -1, suffix = '', prefix = template, dir = None, delete = True):
'''Create and return a temporary file.
Arguments:
\'prefix\', \'suffix\', \'dir\' -- as for mkstemp.
\'mode\' -- the mode argument to os.fdopen (default "w+b").
\'bufsize\' -- the buffer size argument to os.fdopen (default -1).
\'delete\' -- whether the file is deleted on close (default True).
The file is created as mkstemp() would do it.
Returns an object with a file-like interface; the name of the file
is accessible as file.name. The file will be automatically deleted
when it is closed unless the \'delete\' argument is set to False.
'''
if dir is None:
dir = gettempdir()
if 'b' in mode:
flags = _bin_openflags
else:
flags = _text_openflags
if _os.name == 'nt' and delete:
flags |= _os.O_TEMPORARY
(fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
file = _os.fdopen(fd, mode, bufsize)
return _TemporaryFileWrapper(file, name, delete)
if _os.name != 'posix' or _os.sys.platform == 'cygwin':
TemporaryFile = NamedTemporaryFile
else:
def TemporaryFile(mode = 'w+b', bufsize = -1, suffix = '', prefix = template, dir = None):
'''Create and return a temporary file.
Arguments:
\'prefix\', \'suffix\', \'dir\' -- as for mkstemp.
\'mode\' -- the mode argument to os.fdopen (default "w+b").
\'bufsize\' -- the buffer size argument to os.fdopen (default -1).
The file is created as mkstemp() would do it.
Returns an object with a file-like interface. The file has no
name, and will cease to exist when it is closed.
'''
if dir is None:
dir = gettempdir()
if 'b' in mode:
flags = _bin_openflags
else:
flags = _text_openflags
(fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
try:
_os.unlink(name)
return _os.fdopen(fd, mode, bufsize)
except:
_os.close(fd)
raise
class SpooledTemporaryFile:
'''Temporary file wrapper, specialized to switch from
StringIO to a real file when it exceeds a certain size or
when a fileno is needed.
'''
_rolled = False
def __init__(self, max_size = 0, mode = 'w+b', bufsize = -1, suffix = '', prefix = template, dir = None):
self._file = _StringIO()
self._max_size = max_size
self._rolled = False
self._TemporaryFileArgs = (mode, bufsize, suffix, prefix, dir)
def _check(self, file):
if self._rolled:
return None
max_size = None._max_size
if max_size and file.tell() > max_size:
self.rollover()
def rollover(self):
if self._rolled:
return None
file = None._file
newfile = self._file = TemporaryFile(*self._TemporaryFileArgs)
del self._TemporaryFileArgs
newfile.write(file.getvalue())
newfile.seek(file.tell(), 0)
self._rolled = True
def __enter__(self):
if self._file.closed:
raise ValueError('Cannot enter context with closed file')
return self
def __exit__(self, exc, value, tb):
self._file.close()
def __iter__(self):
return self._file.__iter__()
def close(self):
self._file.close()
def closed(self):
return self._file.closed
closed = property(closed)
def fileno(self):
self.rollover()
return self._file.fileno()
def flush(self):
self._file.flush()
def isatty(self):
return self._file.isatty()
def mode(self):
try:
return self._file.mode
except AttributeError:
return self._TemporaryFileArgs[0]
mode = property(mode)
def name(self):
try:
return self._file.name
except AttributeError:
return None
name = property(name)
def next(self):
return self._file.next
def read(self, *args):
return self._file.read(*args)
def readline(self, *args):
return self._file.readline(*args)
def readlines(self, *args):
return self._file.readlines(*args)
def seek(self, *args):
self._file.seek(*args)
def softspace(self):
return self._file.softspace
softspace = property(softspace)
def tell(self):
return self._file.tell()
def truncate(self):
self._file.truncate()
def write(self, s):
file = self._file
rv = file.write(s)
self._check(file)
return rv
def writelines(self, iterable):
file = self._file
rv = file.writelines(iterable)
self._check(file)
return rv
def xreadlines(self, *args):
if hasattr(self._file, 'xreadlines'):
return iter(self._file)
return None(self._file.readlines(*args))