Mercurial > p > roundup > code

annotate roundup/backends/blobfiles.py @ 968:07d8a4e296f8

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Whee! It's not finished yet, but I can create a new instance... ...and play with it a little bit :)
author Richard Jones <richard@users.sourceforge.net>
date Thu, 22 Aug 2002 07:56:51 +0000
parents 974a4b94c5e3
children 32e41ddf2edb
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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 1.8 2002-07-19 03:36:34 richard Exp $
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19 '''
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20 This module exports file storage for roundup backends.
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21 Files are stored into a directory hierarchy.
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22 '''
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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 # open the temp file for writing
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81 open(name + '.tmp', 'wb').write(content)
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82
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83 # save off the commit action
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84 self.transactions.append((self.doStoreFile, (classname, nodeid,
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85 property)))
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86
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87 def getfile(self, classname, nodeid, property):
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88 '''Get the content of the file in the database.
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89 '''
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90 filename = self.filename(classname, nodeid, property)
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91 try:
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92 return open(filename, 'rb').read()
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93 except:
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94 # now try the temp pre-commit filename
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95 try:
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96 return open(filename+'.tmp', 'rb').read()
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97 except:
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98 # fallback to flat file storage
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99 filename = self.filename_flat(classname, nodeid, property)
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100 return open(filename, 'rb').read()
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101
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102 def numfiles(self):
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103 '''Get number of files in storage, even across subdirectories.
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104 '''
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105 files_dir = os.path.join(self.dir, 'files')
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106 return files_in_dir(files_dir)
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107
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108 def doStoreFile(self, classname, nodeid, property, **databases):
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109 '''Store the file as part of a transaction commit.
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110 '''
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111 # determine the name of the file to write to
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112 name = self.filename(classname, nodeid, property)
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113
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114 # the file is currently ".tmp" - move it to its real name to commit
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115 os.rename(name+".tmp", name)
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116
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117 # return the classname, nodeid so we reindex this content
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118 return (classname, nodeid)
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119
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120 def rollbackStoreFile(self, classname, nodeid, property, **databases):
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121 '''Remove the temp file as a part of a rollback
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122 '''
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123 # determine the name of the file to delete
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124 name = self.filename(classname, nodeid, property)
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125 if os.path.exists(name+".tmp"):
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126 os.remove(name+".tmp")
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127
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128 # $Log: not supported by cvs2svn $
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129 # Revision 1.7 2002/07/14 06:14:40 richard
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130 # Some more TODOs
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131 #
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132 # Revision 1.6 2002/07/09 03:02:52 richard
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133 # More indexer work:
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134 # - all String properties may now be indexed too. Currently there's a bit of
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135 # "issue" specific code in the actual searching which needs to be
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136 # addressed. In a nutshell:
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137 # + pass 'indexme="yes"' as a String() property initialisation arg, eg:
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138 # file = FileClass(db, "file", name=String(), type=String(),
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139 # comment=String(indexme="yes"))
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140 # + the comment will then be indexed and be searchable, with the results
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141 # related back to the issue that the file is linked to
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142 # - as a result of this work, the FileClass has a default MIME type that may
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143 # be overridden in a subclass, or by the use of a "type" property as is
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144 # done in the default templates.
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145 # - the regeneration of the indexes (if necessary) is done once the schema is
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146 # set up in the dbinit.
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147 #
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148 # Revision 1.5 2002/07/08 06:58:15 richard
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149 # cleaned up the indexer code:
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150 # - it splits more words out (much simpler, faster splitter)
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151 # - removed code we'll never use (roundup.roundup_indexer has the full
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152 # implementation, and replaces roundup.indexer)
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153 # - only index text/plain and rfc822/message (ideas for other text formats to
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154 # index are welcome)
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155 # - added simple unit test for indexer. Needs more tests for regression.
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156 #
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157 # Revision 1.4 2002/06/19 03:07:19 richard
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158 # Moved the file storage commit into blobfiles where it belongs.
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159 #
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160 # Revision 1.3 2002/02/27 07:33:34 grubert
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161 # . add, vim line and cvs log key.
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162 #
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163 #
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164 # vim: set filetype=python ts=4 sw=4 et si
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