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
157
|
#!/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
|
