Mercurial > p > roundup > code

annotate roundup/backends/blobfiles.py @ 2089:93f03c6714d8

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A few big changes in this commit: 1. The current indexer has been moved to backends/indexer_dbm in anticipation of my writing an indexer_rdbms, 2. Changed indexer invocation during create / set to follow the pattern set by the metakit backend, which was much cleaner, and 3. The "content" property of FileClass is now mutable in all but the metakit backend. Metakit needs to be changed to support the editing of "content". Hey, and I learnt today that the metakit backend implements its own indexer. How about that... :)
author Richard Jones <richard@users.sourceforge.net>
date Fri, 19 Mar 2004 04:47:59 +0000
parents fc52d57c6c3e
children 682eefe8ef23 4d112730e02f
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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 1.12 2004-03-19 04:47:59 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 if property:
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45 name = '%s%s.%s'%(classname, nodeid, property)
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46 else:
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47 # roundupdb.FileClass never specified the property name, so don't
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48 # include it
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49 name = '%s%s'%(classname, nodeid)
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50
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51 # have a separate subdir for every thousand messages
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52 subdir = str(int(nodeid) / 1000)
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53 return os.path.join(self.dir, 'files', classname, subdir, name)
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54
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55 def filename_flat(self, classname, nodeid, property=None):
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56 '''Determine what the filename for the given node and optionally
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57 property is.
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58 '''
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59 if property:
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60 return os.path.join(self.dir, 'files', '%s%s.%s'%(classname,
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61 nodeid, property))
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62 else:
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63 # roundupdb.FileClass never specified the property name, so don't
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64 # include it
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65 return os.path.join(self.dir, 'files', '%s%s'%(classname,
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66 nodeid))
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67
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68 def storefile(self, classname, nodeid, property, content):
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69 '''Store the content of the file in the database. The property may be
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70 None, in which case the filename does not indicate which property
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71 is being saved.
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72 '''
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73 # determine the name of the file to write to
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74 name = self.filename(classname, nodeid, property)
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75
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76 # make sure the file storage dir exists
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77 if not os.path.exists(os.path.dirname(name)):
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78 os.makedirs(os.path.dirname(name))
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79
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80 # save to a temp file
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81 name = name + '.tmp'
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82 # make sure we don't register the rename action more than once
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83 if not os.path.exists(name):
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84 # save off the rename action
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85 self.transactions.append((self.doStoreFile, (classname, nodeid,
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86 property)))
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87 open(name, 'wb').write(content)
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88
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89 def getfile(self, classname, nodeid, property):
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90 '''Get the content of the file in the database.
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91 '''
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92 # try a variety of different filenames - the file could be in the
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93 # usual place, or it could be in a temp file pre-commit *or* it
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94 # could be in an old-style, backwards-compatible flat directory
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95 filename = self.filename(classname, nodeid, property)
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96 flat_filename = self.filename_flat(classname, nodeid, property)
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97 for filename in (filename, filename+'.tmp', flat_filename):
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98 if os.path.exists(filename):
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99 f = open(filename, 'rb')
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100 break
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101 else:
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102 raise IOError, 'content file not found'
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103 # snarf the contents and make sure we close the file
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104 content = f.read()
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105 f.close()
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106 return content
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107
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108 def numfiles(self):
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109 '''Get number of files in storage, even across subdirectories.
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110 '''
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111 files_dir = os.path.join(self.dir, 'files')
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112 return files_in_dir(files_dir)
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113
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114 def doStoreFile(self, classname, nodeid, property, **databases):
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115 '''Store the file as part of a transaction commit.
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116 '''
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117 # determine the name of the file to write to
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118 name = self.filename(classname, nodeid, property)
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119
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120 # content is being updated (and some platforms, eg. win32, won't
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121 # let us rename over the top of the old file)
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122 if os.path.exists(name):
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123 os.remove(name)
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124
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125 # the file is currently ".tmp" - move it to its real name to commit
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Richard Jones <richard@users.sourceforge.net>
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126 os.rename(name+".tmp", name)
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127
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128 # return the classname, nodeid so we reindex this content
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129 return (classname, nodeid)
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130
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974a4b94c5e3 Implemented the destroy() method needed by the session database...
Richard Jones <richard@users.sourceforge.net>
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131 def rollbackStoreFile(self, classname, nodeid, property, **databases):
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132 '''Remove the temp file as a part of a rollback
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133 '''
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134 # determine the name of the file to delete
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135 name = self.filename(classname, nodeid, property)
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136 if os.path.exists(name+".tmp"):
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137 os.remove(name+".tmp")
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e6d1c6d66de3 add module blobfiles in backends with file access functions. not yet activated.
Engelbert Gruber <grubert@users.sourceforge.net>
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138
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66b324f895d1 add, vim line and cvs log key.
Engelbert Gruber <grubert@users.sourceforge.net>
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139 # vim: set filetype=python ts=4 sw=4 et si
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