annotate MoinMoin/caching.py @ 3932:2bcd23157684

caching: remove page_or_wiki scope
author Johannes Berg <johannes AT sipsolutions DOT net>
date Tue, 05 Aug 2008 17:35:16 +0200
parents f042906b346e
children 149357d4bb4d
rev   line source
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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 Juergen Hermann <jh@web.de>,
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6 2006-2008 MoinMoin:ThomasWaldmann,
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7 2008 MoinMoin:ThomasPfaff
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8 @license: GNU GPL, see COPYING for details.
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9 """
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10
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11 import os
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12 import shutil
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13 import tempfile
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14
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15 from MoinMoin import log
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16 logging = log.getLogger(__name__)
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17
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18 from MoinMoin import config
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19 from MoinMoin.util import filesys, lock, pickle, PICKLE_PROTOCOL
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20
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21
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22 class CacheError(Exception):
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23 """ raised if we have trouble reading or writing to the cache """
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24 pass
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25
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26
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27 def get_arena_dir(request, arena, scope):
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28 if scope == 'item': # arena is a Page instance
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29 # we could move cache out of the page directory and store it to cache_dir
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30 return arena.getPagePath('cache', check_create=1)
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31 elif scope == 'wiki':
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32 return os.path.join(request.cfg.cache_dir, request.cfg.siteid, arena)
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33 elif scope == 'farm':
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34 return os.path.join(request.cfg.cache_dir, '__common__', arena)
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35 return None
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36
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37
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38 def get_cache_list(request, arena, scope):
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39 arena_dir = get_arena_dir(request, arena, scope)
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40 try:
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41 return filesys.dclistdir(arena_dir)
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42 except OSError:
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43 return []
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44
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45
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46 class CacheEntry:
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47 def __init__(self, request, arena, key, scope='wiki', do_locking=True,
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48 use_pickle=False, use_encode=False):
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49 """ init a cache entry
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50 @param request: the request object
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51 @param arena: either a string or a page object, when we want to use
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52 page local cache area
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53 @param key: under which key we access the cache content
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54 @param scope: the scope where we are caching:
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55 'item' - an item local cache
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56 'wiki' - a wiki local cache
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57 'farm' - a cache for the whole farm
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58 @param do_locking: if there should be a lock, normally True
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59 @param use_pickle: if data should be pickled/unpickled (nice for arbitrary cache content)
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60 @param use_encode: if data should be encoded/decoded (nice for readable cache files)
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61 """
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62 self.request = request
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63 self.key = key
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64 self.locking = do_locking
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65 self.use_pickle = use_pickle
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66 self.use_encode = use_encode
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67 self.arena_dir = get_arena_dir(request, arena, scope)
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68 if not os.path.exists(self.arena_dir):
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69 os.makedirs(self.arena_dir)
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70 self._fname = os.path.join(self.arena_dir, key)
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71
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72 if self.locking:
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73 self.lock_dir = os.path.join(self.arena_dir, '__lock__')
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74 self.rlock = lock.LazyReadLock(self.lock_dir, 60.0)
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75 self.wlock = lock.LazyWriteLock(self.lock_dir, 60.0)
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76
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77 # used by file-like api:
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78 self._lock = None # either self.rlock or self.wlock
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79 self._fileobj = None # open cache file object
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80 self._tmp_fname = None # name of temporary file (used for write)
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81 self._mode = None # mode of open file object
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82
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83
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84 def _filename(self):
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85 # DEPRECATED - please use file-like api
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86 return self._fname
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87
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88 def exists(self):
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89 return os.path.exists(self._fname)
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90
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91 def mtime(self):
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92 # DEPRECATED for checking a changed on-disk cache, please use
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93 # self.uid() for this, see below
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94 try:
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95 return os.path.getmtime(self._fname)
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96 except (IOError, OSError):
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97 return 0
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98
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99 def size(self):
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100 try:
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101 return os.path.getsize(self._fname)
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102 except (IOError, OSError):
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103 return 0
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104
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105 def uid(self):
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106 """ Return a value that likely changes when the on-disk cache was updated.
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107
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108 See docstring of MoinMoin.util.filesys.fuid for details.
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109 """
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110 return filesys.fuid(self._fname)
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111
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112 def needsUpdate(self, filename, attachdir=None):
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113 # following code is not necessary. will trigger exception and give same result
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114 #if not self.exists():
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115 # return 1
0
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116
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117 try:
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118 ctime = os.path.getmtime(self._fname)
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119 ftime = os.path.getmtime(filename)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
120 except os.error:
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
121 return 1
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
122
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
123 needsupdate = ftime > ctime
931
141083b64fb1 whitespace and minor style changes only
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 902
diff changeset
124
0
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
125 # if a page depends on the attachment dir, we check this, too:
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diff changeset
126 if not needsupdate and attachdir:
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parents:
diff changeset
127 try:
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parents:
diff changeset
128 ftime2 = os.path.getmtime(attachdir)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
129 except os.error:
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parents:
diff changeset
130 ftime2 = 0
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
131 needsupdate = ftime2 > ctime
931
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 902
diff changeset
132
0
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
133 return needsupdate
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parents:
diff changeset
134
3878
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parents: 3610
diff changeset
135 def _determine_locktype(self, mode):
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
136 """ return the correct lock object for a specific file access mode """
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
137 if self.locking:
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
138 if 'r' in mode:
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
139 lock = self.rlock
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
140 if 'w' in mode or 'a' in mode:
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
141 lock = self.wlock
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
142 else:
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
143 lock = None
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diff changeset
144 return lock
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parents: 3610
diff changeset
145
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
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diff changeset
146 # file-like interface ----------------------------------------------------
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diff changeset
147
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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diff changeset
148 def open(self, filename=None, mode='r', bufsize=-1):
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diff changeset
149 """ open the cache for reading/writing
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diff changeset
150
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diff changeset
151 @param filename: must be None (default - automatically determine filename)
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diff changeset
152 @param mode: 'r' (read, default), 'w' (write)
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parents: 3610
diff changeset
153 Note: if mode does not include 'b' (binary), it will be
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parents: 3610
diff changeset
154 automatically changed to include 'b'.
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parents: 3610
diff changeset
155 @param bufsize: size of read/write buffer (default: -1 meaning automatic)
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parents: 3610
diff changeset
156 @return: None (the opened file object is kept in self._fileobj and used
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parents: 3610
diff changeset
157 implicitely by read/write/close functions of CacheEntry object.
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diff changeset
158 """
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parents: 3610
diff changeset
159 assert self._fileobj is None, 'caching: trying to open an already opened cache'
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
160 assert filename is None, 'caching: giving a filename is not supported (yet?)'
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parents: 3610
diff changeset
161
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
162 self._lock = self._determine_locktype(mode)
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parents: 3610
diff changeset
163
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
164 if 'b' not in mode:
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
165 mode += 'b' # we want to use binary mode, ever!
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
166 self._mode = mode # for self.close()
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
167
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
168 if not self.locking or self.locking and self._lock.acquire(1.0):
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
169 try:
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
170 if 'r' in mode:
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parents: 3610
diff changeset
171 self._fileobj = open(self._fname, mode, bufsize)
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parents: 3610
diff changeset
172 elif 'w' in mode:
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parents: 3610
diff changeset
173 # we do not write content to old inode, but to a new file
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parents: 3610
diff changeset
174 # so we don't need to lock when we just want to read the file
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parents: 3610
diff changeset
175 # (at least on POSIX, this works)
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
176 fd, self._tmp_fname = tempfile.mkstemp('.tmp', self.key, self.arena_dir)
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
177 self._fileobj = os.fdopen(fd, mode, bufsize)
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parents: 3610
diff changeset
178 else:
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
179 raise ValueError("caching: mode does not contain 'r' or 'w'")
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
180 finally:
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parents: 3610
diff changeset
181 if self.locking:
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
182 self._lock.release()
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
183 self._lock = None
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parents: 3610
diff changeset
184 else:
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
185 logging.error("Can't acquire read/write lock in %s" % self.lock_dir)
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diff changeset
186
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
187
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parents: 3610
diff changeset
188 def read(self, size=-1):
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parents: 3610
diff changeset
189 """ read data from cache file
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diff changeset
190
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
191 @param size: how many bytes to read (default: -1 == everything)
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
192 @return: read data (str)
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
193 """
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
194 return self._fileobj.read(size)
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diff changeset
195
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
196 def write(self, data):
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parents: 3610
diff changeset
197 """ write data to cache file
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diff changeset
198
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
199 @param data: write data (str)
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diff changeset
200 """
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
201 self._fileobj.write(data)
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parents: 3610
diff changeset
202
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
203 def close(self):
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parents: 3610
diff changeset
204 """ close cache file (and release lock, if any) """
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
205 if self._fileobj:
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parents: 3610
diff changeset
206 self._fileobj.close()
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
207 self._fileobj = None
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parents: 3610
diff changeset
208 if 'w' in self._mode:
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parents: 3610
diff changeset
209 filesys.chmod(self._tmp_fname, 0666 & config.umask) # fix mode that mkstemp chose
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
210 # this is either atomic or happening with real locks set:
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
211 filesys.rename(self._tmp_fname, self._fname)
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
212
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
213 if self._lock:
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
214 if self.locking:
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parents: 3610
diff changeset
215 self._lock.release()
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parents: 3610
diff changeset
216 self._lock = None
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
217
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
218 # ------------------------------------------------------------------------
0
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parents:
diff changeset
219
1638
5070d0358544 caching: move use_pickle to __init__, remove unused encode/decode args from .content()/.update()
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 1637
diff changeset
220 def update(self, content):
1637
47a173ae5401 caching module: use_pickle argument for .content() and .update()
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 1429
diff changeset
221 try:
3878
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
222 if hasattr(content, 'read'):
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
223 # content is file-like
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parents: 3610
diff changeset
224 assert not (self.use_pickle or self.use_encode), 'caching: use_pickle and use_encode not supported with file-like api'
1637
47a173ae5401 caching module: use_pickle argument for .content() and .update()
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 1429
diff changeset
225 try:
3878
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parents: 3610
diff changeset
226 self.open(mode='w')
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
227 shutil.copyfileobj(content, self)
1637
47a173ae5401 caching module: use_pickle argument for .content() and .update()
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 1429
diff changeset
228 finally:
3878
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
229 self.close()
1637
47a173ae5401 caching module: use_pickle argument for .content() and .update()
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 1429
diff changeset
230 else:
3878
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
231 # content is a string
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
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parents: 3610
diff changeset
232 if self.use_pickle:
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Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
233 content = pickle.dumps(content, PICKLE_PROTOCOL)
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
234 elif self.use_encode:
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
235 content = content.encode(config.charset)
b13a58a18dac caching module backported from 1.8 (file-like new api, old api still as is)
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 3610
diff changeset
236
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237 try:
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238 self.open(mode='w')
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239 self.write(content)
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240 finally:
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241 self.close()
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93be75db2051 handle out-of-space errors in PageEditor and caching, avoid 'current' corruption (thanks to TheAnarcat)
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242 except (pickle.PicklingError, OSError, IOError, ValueError), err:
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47a173ae5401 caching module: use_pickle argument for .content() and .update()
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243 raise CacheError(str(err))
0
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244
3878
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245 def content(self):
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246 # no file-like api yet, we implement it when we need it
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247 try:
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248 try:
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249 self.open(mode='r')
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250 data = self.read()
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251 finally:
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252 self.close()
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253 if self.use_pickle:
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254 data = pickle.loads(data)
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255 elif self.use_encode:
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256 data = data.decode(config.charset)
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257 return data
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258 except (pickle.UnpicklingError, IOError, EOFError, ValueError), err:
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259 raise CacheError(str(err))
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260
0
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261 def remove(self):
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262 if not self.locking or self.locking and self.wlock.acquire(1.0):
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263 try:
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264 try:
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265 os.remove(self._fname)
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266 except OSError:
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267 pass
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268 finally:
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269 if self.locking:
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270 self.wlock.release()
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271 else:
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272 logging.error("Can't acquire write lock in %s" % self.lock_dir)
0
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273
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274