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
|
# -*- Mode: Python -*-
# GObject-Introspection - a framework for introspecting GObject libraries
# Copyright (C) 2008 Johan Dahlin
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
import cPickle
import hashlib
import os
import errno
def _get_cachedir():
cachedir = os.path.join(os.environ['HOME'], '.cache')
if not os.path.exists(cachedir):
os.mkdir(cachedir, 0755)
scannerdir = os.path.join(cachedir, 'g-ir-scanner')
if not os.path.exists(scannerdir):
os.mkdir(scannerdir, 0755)
# If it exists and is a file, don't cache at all
elif not os.path.isdir(scannerdir):
return None
return scannerdir
class CacheStore(object):
def __init__(self):
try:
self._directory = _get_cachedir()
except OSError, e:
if e.errno != errno.EPERM:
raise
self._directory = None
def _get_filename(self, filename):
# If we couldn't create the directory we're probably
# on a read only home directory where we just disable
# the cache all together.
if self._directory is None:
return
hexdigest = hashlib.sha1(filename).hexdigest()
return os.path.join(self._directory, hexdigest)
def _cache_is_valid(self, store_filename, filename):
return (os.stat(store_filename).st_mtime >=
os.stat(filename).st_mtime)
def store(self, filename, data):
store_filename = self._get_filename(filename)
if store_filename is None:
return
if (os.path.exists(store_filename) and
self._cache_is_valid(store_filename, filename)):
return None
fd = open(store_filename, 'w')
cPickle.dump(data, fd)
def load(self, filename):
store_filename = self._get_filename(filename)
if store_filename is None:
return
try:
fd = open(store_filename)
except IOError, e:
if e.errno == errno.ENOENT:
return None
raise
if not self._cache_is_valid(store_filename, filename):
return None
data = cPickle.load(fd)
return data
|
