/usr/lib/python2.7/dist-packages/libavg/persist.py is in python-libavg 1.8.1-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | #!/usr/bin/env python
# -*- coding: utf-8 -*-
# libavg - Media Playback Engine.
# Copyright (C) 2003-2014 Ulrich von Zadow
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Current versions can be found at www.libavg.de
#
# Original author of this file is OXullo Interecans <x at brainrapers dot org>
import os
import time
import cPickle as pickle
import libavg
class Persist(object):
def __init__(self, storeFile, initialData, validator=lambda v: True,
autoCommit=False):
self.__storeFile = storeFile
if hasattr(initialData, '__call__'):
initialData = initialData()
elif initialData is None:
initialData = dict()
if os.path.exists(self.__storeFile):
if not os.path.isfile:
raise RuntimeError('%s dump file is not a plain file' % self)
elif not os.access(self.__storeFile, os.R_OK | os.W_OK):
raise RuntimeError('%s dump file'
'cannot be accessed with r/w permissions' % self)
try:
f = open(self.__storeFile)
except IOError:
libavg.logger.debug('Initializing %s' % self)
self.data = initialData
self.commit()
else:
try:
self.data = pickle.load(f)
except:
f.close()
libavg.logger.warning('Persist %s is corrupted or unreadable, '
'reinitializing' % self)
self.data = initialData
self.commit()
else:
f.close()
if not validator(self.data):
libavg.logger.warning('Sanity check failed for %s, '
'reinitializing' % self)
self.data = initialData
self.commit()
else:
libavg.logger.debug('%s successfully loaded' % self)
if autoCommit:
import atexit
atexit.register(self.commit)
def __repr__(self):
return '<%s %s>' % (self.__class__.__name__, self.__storeFile)
@property
def storeFile(self):
return self.__storeFile
def commit(self):
tempFile = self.__storeFile + '.tmp.' + str(int(time.time() * 1000))
try:
with open(tempFile, 'wb') as f:
pickle.dump(self.data, f)
except Exception, e:
libavg.logger.warning('Cannot save %s (%s)' % (self.__storeFile, str(e)))
return False
else:
if os.path.exists(self.__storeFile):
try:
os.remove(self.__storeFile)
except Exception, e:
libavg.logger.warning('Cannot overwrite dump file '
'%s (%s)' % (self, str(e)))
return False
try:
os.rename(tempFile, self.__storeFile)
except Exception, e:
libavg.logger.warning('Cannot save %s (%s)' % (self, str(e)))
os.remove(tempFile)
return False
else:
libavg.logger.debug('%s saved' % self)
return True
class UserPersistentData(Persist):
def __init__(self, appName, fileName, *args, **kargs):
basePath = os.path.join(self._getUserDataPath(), appName)
fullPath = os.path.join(basePath, '%s.pkl' % fileName)
try:
os.makedirs(basePath)
except OSError, e:
import errno
if e.errno != errno.EEXIST:
raise
super(UserPersistentData, self).__init__(fullPath, *args, **kargs)
def _getUserDataPath(self):
if os.name == 'posix':
path = os.path.join(os.environ['HOME'], '.avg')
elif os.name == 'nt':
path = os.path.join(os.environ['APPDATA'], 'Avg')
else:
raise RuntimeError('Unsupported system %s' % os.name)
return path
if __name__ == '__main__':
testFile = './testfile.pkl'
initialData = {'initial': True}
p = Persist(testFile, initialData)
p.commit()
p.data['initial'] = False
p.commit()
p = Persist(testFile, initialData)
print not p.data['initial']
os.unlink(testFile)
p = UserPersistentData('myapp', 'hiscore', initialData)
p.data['initial'] = False
p.commit()
print p
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