Current File : //usr/lib/calibre/calibre/ptempfile.py
__license__ = 'GPL v3'
__copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
"""
Provides platform independent temporary files that persist even after
being closed.
"""
import tempfile, os, atexit
from calibre.constants import (__version__, __appname__, filesystem_encoding,
iswindows, get_windows_temp_path, ismacos)
def cleanup(path):
try:
import os as oss
if oss.path.exists(path):
oss.remove(path)
except:
pass
_base_dir = None
def remove_dir(x):
try:
import shutil
shutil.rmtree(x, ignore_errors=True)
except:
pass
def determined_remove_dir(x):
for i in range(10):
try:
import shutil
shutil.rmtree(x)
return
except:
import os # noqa
if os.path.exists(x):
# In case some other program has one of the temp files open.
import time
time.sleep(0.1)
else:
return
try:
import shutil
shutil.rmtree(x, ignore_errors=True)
except:
pass
def app_prefix(prefix):
if iswindows:
return '%s_'%__appname__
return '%s_%s_%s'%(__appname__, __version__, prefix)
_osx_cache_dir = None
def osx_cache_dir():
global _osx_cache_dir
if _osx_cache_dir:
return _osx_cache_dir
if _osx_cache_dir is None:
_osx_cache_dir = False
import ctypes
libc = ctypes.CDLL(None)
buf = ctypes.create_string_buffer(512)
l = libc.confstr(65538, ctypes.byref(buf), len(buf)) # _CS_DARWIN_USER_CACHE_DIR = 65538
if 0 < l < len(buf):
try:
q = buf.value.decode('utf-8').rstrip('\0')
except ValueError:
pass
if q and os.path.isdir(q) and os.access(q, os.R_OK | os.W_OK | os.X_OK):
_osx_cache_dir = q
return q
def base_dir():
global _base_dir
if _base_dir is not None and not os.path.exists(_base_dir):
# Some people seem to think that running temp file cleaners that
# delete the temp dirs of running programs is a good idea!
_base_dir = None
if _base_dir is None:
td = os.environ.get('CALIBRE_WORKER_TEMP_DIR', None)
if td is not None:
from calibre.utils.serialize import msgpack_loads
from polyglot.binary import from_hex_bytes
try:
td = msgpack_loads(from_hex_bytes(td))
except Exception:
td = None
if td and os.path.exists(td):
_base_dir = td
else:
base = os.environ.get('CALIBRE_TEMP_DIR', None)
if base is not None and iswindows:
base = os.getenv('CALIBRE_TEMP_DIR')
prefix = app_prefix('tmp_')
if base is None:
if iswindows:
# On windows, if the TMP env var points to a path that
# cannot be encoded using the mbcs encoding, then the
# python 2 tempfile algorithm for getting the temporary
# directory breaks. So we use the win32 api to get a
# unicode temp path instead. See
# https://bugs.launchpad.net/bugs/937389
base = get_windows_temp_path()
elif ismacos:
# Use the cache dir rather than the temp dir for temp files as Apple
# thinks deleting unused temp files is a good idea. See note under
# _CS_DARWIN_USER_TEMP_DIR here
# https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/confstr.3.html
base = osx_cache_dir()
_base_dir = tempfile.mkdtemp(prefix=prefix, dir=base)
atexit.register(determined_remove_dir if iswindows else remove_dir, _base_dir)
try:
tempfile.gettempdir()
except Exception:
# Widows temp vars set to a path not encodable in mbcs
# Use our temp dir
tempfile.tempdir = _base_dir
return _base_dir
def reset_base_dir():
global _base_dir
_base_dir = None
base_dir()
def force_unicode(x):
# Cannot use the implementation in calibre.__init__ as it causes a circular
# dependency
if isinstance(x, bytes):
x = x.decode(filesystem_encoding)
return x
def _make_file(suffix, prefix, base):
suffix, prefix = map(force_unicode, (suffix, prefix)) # no2to3
return tempfile.mkstemp(suffix, prefix, dir=base)
def _make_dir(suffix, prefix, base):
suffix, prefix = map(force_unicode, (suffix, prefix)) # no2to3
return tempfile.mkdtemp(suffix, prefix, base)
class PersistentTemporaryFile:
"""
A file-like object that is a temporary file that is available even after being closed on
all platforms. It is automatically deleted on normal program termination.
"""
_file = None
def __init__(self, suffix="", prefix="", dir=None, mode='w+b'):
if prefix is None:
prefix = ""
if dir is None:
dir = base_dir()
fd, name = _make_file(suffix, prefix, dir)
self._file = os.fdopen(fd, mode)
self._name = name
self._fd = fd
atexit.register(cleanup, name)
def __getattr__(self, name):
if name == 'name':
return self.__dict__['_name']
return getattr(self.__dict__['_file'], name)
def __enter__(self):
return self
def __exit__(self, *args):
self.close()
def __del__(self):
try:
self.close()
except:
pass
def PersistentTemporaryDirectory(suffix='', prefix='', dir=None):
'''
Return the path to a newly created temporary directory that will
be automatically deleted on application exit.
'''
if dir is None:
dir = base_dir()
tdir = _make_dir(suffix, prefix, dir)
atexit.register(remove_dir, tdir)
return tdir
class TemporaryDirectory:
'''
A temporary directory to be used in a with statement.
'''
def __init__(self, suffix='', prefix='', dir=None, keep=False):
self.suffix = suffix
self.prefix = prefix
if dir is None:
dir = base_dir()
self.dir = dir
self.keep = keep
def __enter__(self):
if not hasattr(self, 'tdir'):
self.tdir = _make_dir(self.suffix, self.prefix, self.dir)
return self.tdir
def __exit__(self, *args):
if not self.keep and os.path.exists(self.tdir):
remove_dir(self.tdir)
class TemporaryFile:
def __init__(self, suffix="", prefix="", dir=None, mode='w+b'):
if prefix is None:
prefix = ''
if suffix is None:
suffix = ''
if dir is None:
dir = base_dir()
self.prefix, self.suffix, self.dir, self.mode = prefix, suffix, dir, mode
self._file = None
def __enter__(self):
fd, name = _make_file(self.suffix, self.prefix, self.dir)
self._file = os.fdopen(fd, self.mode)
self._name = name
self._file.close()
return name
def __exit__(self, *args):
cleanup(self._name)
class SpooledTemporaryFile(tempfile.SpooledTemporaryFile):
def __init__(self, max_size=0, suffix="", prefix="", dir=None, mode='w+b',
bufsize=-1):
if prefix is None:
prefix = ''
if suffix is None:
suffix = ''
if dir is None:
dir = base_dir()
self._name = None
tempfile.SpooledTemporaryFile.__init__(self, max_size=max_size,
suffix=suffix, prefix=prefix, dir=dir, mode=mode)
@property
def name(self):
return self._name
@name.setter
def name(self, val):
self._name = val
# See https://bugs.python.org/issue26175
def readable(self):
return self._file.readable()
def seekable(self):
return self._file.seekable()
def writable(self):
return self._file.writable()
def better_mktemp(*args, **kwargs):
fd, path = tempfile.mkstemp(*args, **kwargs)
os.close(fd)
return path
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