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annotate roundup/indexer.py @ 826:6d7a45c8464a

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Added reindex command to roundup-admin. Fixed reindex on first access. Also fixed reindexing of entries that change.
author Richard Jones <richard@users.sourceforge.net>
date Tue, 09 Jul 2002 04:19:09 +0000
parents 0779ea9f1f18
children 0a2c1f5e0e5a
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1 #
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2 # This module is derived from the module described at:
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3 # http://gnosis.cx/publish/programming/charming_python_15.txt
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4 #
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5 # Author: David Mertz (mertz@gnosis.cx)
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6 # Thanks to: Pat Knight (p.knight@ktgroup.co.uk)
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7 # Gregory Popovitch (greg@gpy.com)
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8 #
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9 # The original module was released under this license, and remains under
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10 # it:
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11 #
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12 # This file is released to the public domain. I (dqm) would
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13 # appreciate it if you choose to keep derived works under terms
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14 # that promote freedom, but obviously am giving up any rights
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15 # to compel such.
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16 #
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17 #$Id: indexer.py,v 1.5 2002-07-09 04:19:09 richard Exp $
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18 '''
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19 This module provides an indexer class, RoundupIndexer, that stores text
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20 indices in a roundup instance. This class makes searching the content of
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21 messages and text files possible.
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22 '''
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23 import os, shutil, re, mimetypes, marshal, zlib, errno
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24
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25 class Indexer:
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26 ''' Indexes information from roundup's hyperdb to allow efficient
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27 searching.
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28
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29 Three structures are created by the indexer:
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30 files {identifier: (fileid, wordcount)}
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31 words {word: {fileid: count}}
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32 fileids {fileid: identifier}
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33 '''
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34 def __init__(self, db_path):
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35 self.indexdb_path = os.path.join(db_path, 'indexes')
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36 self.indexdb = os.path.join(self.indexdb_path, 'index.db')
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37 self.reindex = 0
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38 self.casesensitive = 0
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39 self.quiet = 9
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40
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41 # see if we need to reindex because of a change in code
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42 if (not os.path.exists(self.indexdb_path) or
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43 not os.path.exists(os.path.join(self.indexdb_path, 'version'))):
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44 # TODO: if the version file exists (in the future) we'll want to
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45 # check the value in it - for now the file itself is a flag
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46 self.force_reindex()
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47
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48 def force_reindex(self):
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49 '''Force a reindex condition
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50 '''
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51 if os.path.exists(self.indexdb_path):
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52 shutil.rmtree(self.indexdb_path)
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53 os.makedirs(self.indexdb_path)
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54 os.chmod(self.indexdb_path, 0775)
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55 open(os.path.join(self.indexdb_path, 'version'), 'w').write('1\n')
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56 self.reindex = 1
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57
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58 def should_reindex(self):
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59 '''Should we reindex?
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60 '''
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61 return self.reindex
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62
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63 def add_text(self, identifier, text, mime_type='text/plain'):
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64 ''' Add some text associated with the (classname, nodeid, property)
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65 identifier.
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66 '''
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67 # make sure the index is loaded
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68 self.load_index()
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69
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70 # remove old entries for this identifier
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71 if self.files.has_key(identifier):
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72 self.purge_entry(identifier)
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73
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74 # split into words
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75 words = self.splitter(text, mime_type)
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76
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77 # Find new file index, and assign it to identifier
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78 # (_TOP uses trick of negative to avoid conflict with file index)
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79 self.files['_TOP'] = (self.files['_TOP'][0]-1, None)
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80 file_index = abs(self.files['_TOP'][0])
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81 self.files[identifier] = (file_index, len(words))
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82 self.fileids[file_index] = identifier
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83
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84 # find the unique words
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85 filedict = {}
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86 for word in words:
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87 if filedict.has_key(word):
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88 filedict[word] = filedict[word]+1
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89 else:
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90 filedict[word] = 1
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91
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92 # now add to the totals
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93 for word in filedict.keys():
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94 # each word has a dict of {identifier: count}
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95 if self.words.has_key(word):
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96 entry = self.words[word]
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97 else:
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98 # new word
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99 entry = {}
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100 self.words[word] = entry
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101
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102 # make a reference to the file for this word
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103 entry[file_index] = filedict[word]
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104
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105 def splitter(self, text, ftype):
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106 ''' Split the contents of a text string into a list of 'words'
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107 '''
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108 if ftype == 'text/plain':
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109 words = self.text_splitter(text, self.casesensitive)
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110 else:
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111 return []
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112 return words
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113
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114 def text_splitter(self, text, casesensitive=0):
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115 """Split text/plain string into a list of words
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116 """
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117 # Let's adjust case if not case-sensitive
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118 if not casesensitive:
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119 text = text.upper()
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120
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121 # Split the raw text, losing anything longer than 25 characters
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122 # since that'll be gibberish (encoded text or somesuch) or shorter
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123 # than 3 characters since those short words appear all over the
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124 # place
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125 return re.findall(r'\b\w{2,25}\b', text)
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126
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127 def search(self, search_terms, klass, ignore={},
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128 dre=re.compile(r'([^\d]+)(\d+)')):
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129 ''' Display search results looking for [search, terms] associated
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130 with the hyperdb Class "klass". Ignore hits on {class: property}.
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131
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132 "dre" is a helper, not an argument.
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133 '''
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134 # do the index lookup
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135 hits = self.find(search_terms)
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136 if not hits:
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137 return {}
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138
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139 # this is specific to "issue" klass ... eugh
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140 designator_propname = {'msg': 'messages', 'file': 'files'}
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141
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142 # build a dictionary of nodes and their associated messages
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143 # and files
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144 nodeids = {}
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145 for classname, nodeid, property in hits.values():
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146 # skip this result if we don't care about this class/property
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147 if ignore.has_key((classname, property)):
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148 continue
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149
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150 # if it's a property on klass, it's easy
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151 if classname == klass.classname:
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152 if not nodeids.has_key(nodeid):
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153 nodeids[nodeid] = {}
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154 continue
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155
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156 # it's a linked class - find the klass entries that are
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157 # linked to it
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158 linkprop = designator_propname[classname]
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159 for resid in klass.find(**{linkprop: nodeid}):
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160 resid = str(resid)
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161 if not nodeids.has_key(id):
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162 nodeids[resid] = {}
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163
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164 # update the links for this klass nodeid
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165 node_dict = nodeids[resid]
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166 if not node_dict.has_key(linkprop):
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167 node_dict[linkprop] = [nodeid]
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168 elif node_dict.has_key(linkprop):
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169 node_dict[linkprop].append(nodeid)
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170 return nodeids
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171
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172 # we override this to ignore not 2 < word < 25 and also to fix a bug -
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173 # the (fail) case.
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174 def find(self, wordlist):
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175 ''' Locate files that match ALL the words in wordlist
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176 '''
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177 if not hasattr(self, 'words'):
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178 self.load_index()
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179 self.load_index(wordlist=wordlist)
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180 entries = {}
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181 hits = None
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182 for word in wordlist:
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183 if not 2 < len(word) < 25:
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184 # word outside the bounds of what we index - ignore
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185 continue
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186 if not self.casesensitive:
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187 word = word.upper()
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188 entry = self.words.get(word) # For each word, get index
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189 entries[word] = entry # of matching files
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190 if not entry: # Nothing for this one word (fail)
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191 return {}
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192 if hits is None:
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193 hits = {}
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194 for k in entry.keys():
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195 hits[k] = self.fileids[k]
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196 else:
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197 # Eliminate hits for every non-match
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198 for fileid in hits.keys():
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199 if not entry.has_key(fileid):
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200 del hits[fileid]
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201 if hits is None:
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202 return {}
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203 return hits
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204
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205 segments = "ABCDEFGHIJKLMNOPQRSTUVWXYZ#-!"
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206 def load_index(self, reload=0, wordlist=None):
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207 # Unless reload is indicated, do not load twice
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208 if self.index_loaded() and not reload:
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209 return 0
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210
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211 # Ok, now let's actually load it
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212 db = {'WORDS': {}, 'FILES': {'_TOP':(0,None)}, 'FILEIDS': {}}
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213
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214 # Identify the relevant word-dictionary segments
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215 if not wordlist:
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216 segments = self.segments
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217 else:
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218 segments = ['-','#']
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219 for word in wordlist:
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220 segments.append(word[0].upper())
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221
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222 # Load the segments
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223 for segment in segments:
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224 try:
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225 f = open(self.indexdb + segment, 'rb')
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226 except IOError, error:
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227 if error.errno != errno.ENOENT:
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228 raise
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229 else:
818
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230 pickle_str = zlib.decompress(f.read())
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231 f.close()
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232 dbslice = marshal.loads(pickle_str)
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233 if dbslice.get('WORDS'):
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234 # if it has some words, add them
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235 for word, entry in dbslice['WORDS'].items():
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236 db['WORDS'][word] = entry
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237 if dbslice.get('FILES'):
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238 # if it has some files, add them
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239 db['FILES'] = dbslice['FILES']
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240 if dbslice.get('FILEIDS'):
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241 # if it has fileids, add them
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242 db['FILEIDS'] = dbslice['FILEIDS']
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243
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244 self.words = db['WORDS']
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245 self.files = db['FILES']
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246 self.fileids = db['FILEIDS']
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247
818
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248 def save_index(self):
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249 # make sure we're loaded
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250 self.load_index()
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251
818
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252 # brutal space saver... delete all the small segments
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253 for segment in self.segments:
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254 try:
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255 os.remove(self.indexdb + segment)
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256 except OSError:
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257 # probably just nonexistent segment index file
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258 # TODO: make sure it's an EEXIST
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259 pass
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260
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261 # First write the much simpler filename/fileid dictionaries
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262 dbfil = {'WORDS':None, 'FILES':self.files, 'FILEIDS':self.fileids}
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diff changeset
263 open(self.indexdb+'-','wb').write(zlib.compress(marshal.dumps(dbfil)))
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264
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265 # The hard part is splitting the word dictionary up, of course
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diff changeset
266 letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ#"
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267 segdicts = {} # Need batch of empty dicts
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diff changeset
268 for segment in letters:
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diff changeset
269 segdicts[segment] = {}
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270 for word, entry in self.words.items(): # Split into segment dicts
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271 initchar = word[0].upper()
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272 segdicts[initchar][word] = entry
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273
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diff changeset
274 # save
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diff changeset
275 for initchar in letters:
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diff changeset
276 db = {'WORDS':segdicts[initchar], 'FILES':None, 'FILEIDS':None}
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diff changeset
277 pickle_str = marshal.dumps(db)
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diff changeset
278 filename = self.indexdb + initchar
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diff changeset
279 pickle_fh = open(filename, 'wb')
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diff changeset
280 pickle_fh.write(zlib.compress(pickle_str))
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diff changeset
281 os.chmod(filename, 0664)
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282
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283 def purge_entry(self, identifier):
818
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284 ''' Remove a file from file index and word index
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285 '''
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diff changeset
286 if not self.files.has_key(identifier):
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diff changeset
287 return
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diff changeset
288
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diff changeset
289 file_index = self.files[identifier][0]
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diff changeset
290 del self.files[identifier]
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diff changeset
291 del self.fileids[file_index]
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diff changeset
292
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diff changeset
293 # The much harder part, cleanup the word index
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diff changeset
294 for key, occurs in self.words.items():
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295 if occurs.has_key(file_index):
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296 del occurs[file_index]
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297
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298 def index_loaded(self):
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299 return (hasattr(self,'fileids') and hasattr(self,'files') and
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300 hasattr(self,'words'))
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301
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302 #
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303 #$Log: not supported by cvs2svn $
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304 #Revision 1.4 2002/07/09 03:02:52 richard
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305 #More indexer work:
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306 #- all String properties may now be indexed too. Currently there's a bit of
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307 # "issue" specific code in the actual searching which needs to be
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308 # addressed. In a nutshell:
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309 # + pass 'indexme="yes"' as a String() property initialisation arg, eg:
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310 # file = FileClass(db, "file", name=String(), type=String(),
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311 # comment=String(indexme="yes"))
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312 # + the comment will then be indexed and be searchable, with the results
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313 # related back to the issue that the file is linked to
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314 #- as a result of this work, the FileClass has a default MIME type that may
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315 # be overridden in a subclass, or by the use of a "type" property as is
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316 # done in the default templates.
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317 #- the regeneration of the indexes (if necessary) is done once the schema is
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318 # set up in the dbinit.
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319 #
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320 #Revision 1.3 2002/07/08 06:58:15 richard
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321 #cleaned up the indexer code:
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322 # - it splits more words out (much simpler, faster splitter)
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323 # - removed code we'll never use (roundup.roundup_indexer has the full
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324 # implementation, and replaces roundup.indexer)
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325 # - only index text/plain and rfc822/message (ideas for other text formats to
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326 # index are welcome)
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327 # - added simple unit test for indexer. Needs more tests for regression.
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328 #
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329 #Revision 1.2 2002/05/25 07:16:24 rochecompaan
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330 #Merged search_indexing-branch with HEAD
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331 #
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332 #Revision 1.1.2.3 2002/05/02 11:52:12 rochecompaan
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333 #Fixed small bug that prevented indexes from being generated.
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334 #
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335 #Revision 1.1.2.2 2002/04/19 19:54:42 rochecompaan
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336 #cgi_client.py
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337 # removed search link for the time being
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338 # moved rendering of matches to htmltemplate
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339 #hyperdb.py
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340 # filtering of nodes on full text search incorporated in filter method
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341 #roundupdb.py
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342 # added paramater to call of filter method
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343 #roundup_indexer.py
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344 # added search method to RoundupIndexer class
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345 #
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346 #Revision 1.1.2.1 2002/04/03 11:55:57 rochecompaan
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347 # . Added feature #526730 - search for messages capability
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348 #
Roundup Issue Tracker: http://roundup-tracker.org/