annotate MoinMoin/caching.py @ 1793:2a4caa295346

Eclipse PyDev Check: fixed lots of its errors and warnings
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Fri, 23 Feb 2007 13:06:42 +0100
parents 6dd2e29acffe
children b5e94fec8669
rev   line source
0
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1 # -*- coding: iso-8859-1 -*-
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2 """
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3 MoinMoin caching module
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4
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5 @copyright: 2001-2004 by Jürgen Hermann <jh@web.de>
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6 @license: GNU GPL, see COPYING for details.
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7 """
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8
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9 import os
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10 import tempfile
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11
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2a4caa295346 Eclipse PyDev Check: fixed lots of its errors and warnings
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12 from MoinMoin.util import filesys, lock, pickle, PICKLE_PROTOCOL
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13
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14
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15 class CacheError(Exception):
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16 """ raised if we have trouble reading or writing to the cache """
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17 pass
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18
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19 class CacheEntry:
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20 def __init__(self, request, arena, key, scope='page_or_wiki', do_locking=True, use_pickle=False):
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21 """ init a cache entry
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22 @param request: the request object
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23 @param arena: either a string or a page object, when we want to use
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24 page local cache area
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25 @param key: under which key we access the cache content
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26 @param lock: if there should be a lock, normally True
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27 @param scope: the scope where we are caching:
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28 'item' - an item local cache
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29 'wiki' - a wiki local cache
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30 'farm' - a cache for the whole farm
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31 """
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32 self.request = request
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33 self.key = key
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34 self.locking = do_locking
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35 self.use_pickle = use_pickle
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36 if scope == 'page_or_wiki': # XXX DEPRECATED, remove later
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37 if isinstance(arena, str):
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38 self.arena_dir = os.path.join(request.cfg.cache_dir, request.cfg.siteid, arena)
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39 else: # arena is in fact a page object
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40 self.arena_dir = arena.getPagePath('cache', check_create=1)
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41 elif scope == 'item': # arena is a Page instance
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42 # we could move cache out of the page directory and store it to cache_dir
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43 self.arena_dir = arena.getPagePath('cache', check_create=1)
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44 elif scope == 'wiki':
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45 self.arena_dir = os.path.join(request.cfg.cache_dir, request.cfg.siteid, arena)
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46 elif scope == 'farm':
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47 self.arena_dir = os.path.join(request.cfg.cache_dir, '__common__', arena)
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48 if not os.path.exists(self.arena_dir):
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49 os.makedirs(self.arena_dir)
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50 if self.locking:
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51 self.lock_dir = os.path.join(self.arena_dir, '__lock__')
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52 self.rlock = lock.LazyReadLock(self.lock_dir, 60.0)
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53 self.wlock = lock.LazyWriteLock(self.lock_dir, 60.0)
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54
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55 def _filename(self):
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56 return os.path.join(self.arena_dir, self.key)
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57
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58 def exists(self):
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59 return os.path.exists(self._filename())
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60
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61 def mtime(self):
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62 try:
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63 return os.path.getmtime(self._filename())
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64 except (IOError, OSError):
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65 return 0
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66
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67 def needsUpdate(self, filename, attachdir=None):
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68 # following code is not necessary. will trigger exception and give same result
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69 #if not self.exists():
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70 # return 1
0
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71
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72 try:
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73 ctime = os.path.getmtime(self._filename())
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74 ftime = os.path.getmtime(filename)
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75 except os.error:
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76 return 1
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77
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78 needsupdate = ftime > ctime
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79
0
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80 # if a page depends on the attachment dir, we check this, too:
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81 if not needsupdate and attachdir:
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82 try:
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83 ftime2 = os.path.getmtime(attachdir)
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84 except os.error:
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85 ftime2 = 0
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86 needsupdate = ftime2 > ctime
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87
0
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88 return needsupdate
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89
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90 def copyto(self, filename):
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91 # currently unused function
0
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92 import shutil
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93 tmpfname = self._tmpfilename()
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94 fname = self._filename()
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95 if not self.locking or self.locking and self.wlock.acquire(1.0):
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96 try:
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97 shutil.copyfile(filename, tmpfname)
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98 # this is either atomic or happening with real locks set:
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99 filesys.rename(tmpfname, fname)
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100 finally:
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101 if self.locking:
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102 self.wlock.release()
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103 else:
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104 self.request.log("Can't acquire write lock in %s" % self.lock_dir)
0
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105
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106 def update(self, content):
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107 try:
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108 fname = self._filename()
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109 if self.use_pickle:
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110 content = pickle.dumps(content, PICKLE_PROTOCOL)
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111 if not self.locking or self.locking and self.wlock.acquire(1.0):
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112 try:
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113 # we do not write content to old inode, but to a new file
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114 # se we don't need to lock when we just want to read the file
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115 # (at least on POSIX, this works)
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116 tmp_handle, tmp_fname = tempfile.mkstemp('.tmp', self.key, self.arena_dir)
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117 os.write(tmp_handle, content)
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118 os.close(tmp_handle)
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119 # this is either atomic or happening with real locks set:
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120 filesys.rename(tmp_fname, fname)
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121 finally:
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122 if self.locking:
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123 self.wlock.release()
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124 else:
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125 self.request.log("Can't acquire write lock in %s" % self.lock_dir)
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126 except (pickle.PicklingError, IOError, ValueError), err:
47a173ae5401 caching module: use_pickle argument for .content() and .update()
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127 raise CacheError(str(err))
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128
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129 def remove(self):
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130 if not self.locking or self.locking and self.wlock.acquire(1.0):
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131 try:
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132 try:
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133 os.remove(self._filename())
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134 except OSError:
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135 pass
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136 finally:
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137 if self.locking:
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138 self.wlock.release()
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139 else:
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140 self.request.log("Can't acquire write lock in %s" % self.lock_dir)
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141
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142 def content(self):
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143 try:
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144 if not self.locking or self.locking and self.rlock.acquire(1.0):
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145 try:
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146 f = open(self._filename(), 'rb')
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147 data = f.read()
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148 f.close()
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149 finally:
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150 if self.locking:
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151 self.rlock.release()
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152 else:
47a173ae5401 caching module: use_pickle argument for .content() and .update()
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153 self.request.log("Can't acquire read lock in %s" % self.lock_dir)
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154 if self.use_pickle:
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155 data = pickle.loads(data)
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156 return data
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157 except (pickle.UnpicklingError, IOError, EOFError, ValueError), err:
47a173ae5401 caching module: use_pickle argument for .content() and .update()
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158 raise CacheError(str(err))
0
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159