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annotate roundup/backends/blobfiles.py @ 2899:09a4d6dd6dcb

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Handle older (really older) anydbm databases in export code. Handle really old file stores too.
author Richard Jones <richard@users.sourceforge.net>
date Thu, 11 Nov 2004 06:04:59 +0000
parents 682eefe8ef23
children a8808157f892
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 #$Id: blobfiles.py,v 1.14 2004-11-11 06:04:59 richard Exp $
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19 '''This module exports file storage for roundup backends.
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20 Files are stored into a directory hierarchy.
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21 '''
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22 __docformat__ = 'restructuredtext'
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23
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24 import os
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25
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26 def files_in_dir(dir):
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27 if not os.path.exists(dir):
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28 return 0
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29 num_files = 0
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30 for dir_entry in os.listdir(dir):
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31 full_filename = os.path.join(dir,dir_entry)
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32 if os.path.isfile(full_filename):
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33 num_files = num_files + 1
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34 elif os.path.isdir(full_filename):
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35 num_files = num_files + files_in_dir(full_filename)
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36 return num_files
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37
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38 class FileStorage:
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39 """Store files in some directory structure"""
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40 def filename(self, classname, nodeid, property=None):
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41 '''Determine what the filename for the given node and optionally
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42 property is.
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43
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44 Try a variety of different filenames - the file could be in the
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45 usual place, or it could be in a temp file pre-commit *or* it
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46 could be in an old-style, backwards-compatible flat directory.
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47 '''
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48 if property:
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49 name = '%s%s.%s'%(classname, nodeid, property)
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50 else:
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51 # roundupdb.FileClass never specified the property name, so don't
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52 # include it
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53 name = '%s%s'%(classname, nodeid)
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54
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55 # have a separate subdir for every thousand messages
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56 subdir = str(int(nodeid) / 1000)
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57 filename = os.path.join(self.dir, 'files', classname, subdir, name)
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58 if os.path.exists(filename):
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59 return filename
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60
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61 # try .tmp
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62 filename = filename + '.tmp'
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63 if os.path.exists(filename):
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64 return filename
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65
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66 # ok, try flat (very old-style)
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67 if property:
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68 filename = os.path.join(self.dir, 'files', '%s%s.%s'%(classname,
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69 nodeid, property))
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70 else:
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71 filename = os.path.join(self.dir, 'files', '%s%s'%(classname,
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72 nodeid))
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73 if os.path.exists(filename):
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74 return filename
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75
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76 # file just ain't there
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77 raise IOError, 'content file for %s not found'%name
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78
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79 def storefile(self, classname, nodeid, property, content):
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80 '''Store the content of the file in the database. The property may be
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81 None, in which case the filename does not indicate which property
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82 is being saved.
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83 '''
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84 # determine the name of the file to write to
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85 name = self.filename(classname, nodeid, property)
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86
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87 # make sure the file storage dir exists
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88 if not os.path.exists(os.path.dirname(name)):
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89 os.makedirs(os.path.dirname(name))
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90
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91 # save to a temp file
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92 name = name + '.tmp'
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93 # make sure we don't register the rename action more than once
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94 if not os.path.exists(name):
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95 # save off the rename action
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96 self.transactions.append((self.doStoreFile, (classname, nodeid,
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97 property)))
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98 open(name, 'wb').write(content)
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99
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100 def getfile(self, classname, nodeid, property):
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101 '''Get the content of the file in the database.
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102 '''
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103 filename = self.filename(classname, nodeid, property)
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104
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105 f = open(filename, 'rb')
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106 try:
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107 # snarf the contents and make sure we close the file
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108 return f.read()
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109 finally:
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110 f.close()
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111
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112 def numfiles(self):
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113 '''Get number of files in storage, even across subdirectories.
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114 '''
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115 files_dir = os.path.join(self.dir, 'files')
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116 return files_in_dir(files_dir)
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117
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118 def doStoreFile(self, classname, nodeid, property, **databases):
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119 '''Store the file as part of a transaction commit.
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120 '''
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121 # determine the name of the file to write to
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122 name = self.filename(classname, nodeid, property)
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123
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124 # content is being updated (and some platforms, eg. win32, won't
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125 # let us rename over the top of the old file)
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126 if os.path.exists(name):
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127 os.remove(name)
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128
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129 # the file is currently ".tmp" - move it to its real name to commit
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130 os.rename(name+".tmp", name)
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131
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132 # return the classname, nodeid so we reindex this content
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133 return (classname, nodeid)
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134
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135 def rollbackStoreFile(self, classname, nodeid, property, **databases):
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136 '''Remove the temp file as a part of a rollback
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137 '''
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138 # determine the name of the file to delete
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139 name = self.filename(classname, nodeid, property)
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140 if os.path.exists(name+".tmp"):
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141 os.remove(name+".tmp")
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142
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143 # vim: set filetype=python ts=4 sw=4 et si
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