Mercurial > p > roundup > code

annotate roundup/backends/indexer_dbm.py @ 2623:4e1030d49cea

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fix: Option defaults were applied as strings... ...not converted to internal representation; add Option methods str2value and value2str for value conversion from and to the strings kept in .ini file; options MAIL_USERNAME, MAIL_TLS_KEYFILE and MAIL_TLS_CERTFILE default to empty strings: NODEFAULT value is a configuration error, and for these options it is ok to keep them unset.
author Alexander Smishlajev <a1s@users.sourceforge.net>
date Sun, 25 Jul 2004 14:36:50 +0000
parents 93f03c6714d8
children d530b68e4b42 49d1fd44881a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_dbm.py,v 1.1 2004-03-19 04:47:59 richard Exp $
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18 '''This module provides an indexer class, RoundupIndexer, that stores text
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19 indices in a roundup instance. This class makes searching the content of
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20 messages, string properties and text files possible.
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21 '''
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22 __docformat__ = 'restructuredtext'
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23
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24 import os, shutil, re, mimetypes, marshal, zlib, errno
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25 from roundup.hyperdb import Link, Multilink
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26
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27 class Indexer:
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28 '''Indexes information from roundup's hyperdb to allow efficient
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29 searching.
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30
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31 Three structures are created by the indexer::
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32
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33 files {identifier: (fileid, wordcount)}
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34 words {word: {fileid: count}}
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35 fileids {fileid: identifier}
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36
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37 where identifier is (classname, nodeid, propertyname)
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38 '''
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39 def __init__(self, db_path):
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40 self.indexdb_path = os.path.join(db_path, 'indexes')
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41 self.indexdb = os.path.join(self.indexdb_path, 'index.db')
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42 self.reindex = 0
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43 self.quiet = 9
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44 self.changed = 0
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45
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46 # see if we need to reindex because of a change in code
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47 version = os.path.join(self.indexdb_path, 'version')
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48 if (not os.path.exists(self.indexdb_path) or
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49 not os.path.exists(version)):
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50 # for now the file itself is a flag
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51 self.force_reindex()
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52 elif os.path.exists(version):
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53 version = open(version).read()
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54 # check the value and reindex if it's not the latest
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55 if version.strip() != '1':
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56 self.force_reindex()
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57
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58 def force_reindex(self):
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59 '''Force a reindex condition
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60 '''
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61 if os.path.exists(self.indexdb_path):
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62 shutil.rmtree(self.indexdb_path)
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63 os.makedirs(self.indexdb_path)
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64 os.chmod(self.indexdb_path, 0775)
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65 open(os.path.join(self.indexdb_path, 'version'), 'w').write('1\n')
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66 self.reindex = 1
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67 self.changed = 1
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68
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69 def should_reindex(self):
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70 '''Should we reindex?
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71 '''
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72 return self.reindex
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73
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74 def add_text(self, identifier, text, mime_type='text/plain'):
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75 '''Add some text associated with the (classname, nodeid, property)
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76 identifier.
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77 '''
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78 # make sure the index is loaded
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79 self.load_index()
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80
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81 # remove old entries for this identifier
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82 if self.files.has_key(identifier):
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83 self.purge_entry(identifier)
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84
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85 # split into words
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86 words = self.splitter(text, mime_type)
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87
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88 # Find new file index, and assign it to identifier
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89 # (_TOP uses trick of negative to avoid conflict with file index)
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90 self.files['_TOP'] = (self.files['_TOP'][0]-1, None)
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91 file_index = abs(self.files['_TOP'][0])
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92 self.files[identifier] = (file_index, len(words))
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93 self.fileids[file_index] = identifier
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94
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95 # find the unique words
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96 filedict = {}
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97 for word in words:
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98 if filedict.has_key(word):
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99 filedict[word] = filedict[word]+1
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100 else:
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101 filedict[word] = 1
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102
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103 # now add to the totals
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104 for word in filedict.keys():
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105 # each word has a dict of {identifier: count}
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106 if self.words.has_key(word):
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107 entry = self.words[word]
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108 else:
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109 # new word
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110 entry = {}
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111 self.words[word] = entry
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112
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113 # make a reference to the file for this word
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114 entry[file_index] = filedict[word]
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115
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116 # save needed
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117 self.changed = 1
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118
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119 def splitter(self, text, ftype):
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120 '''Split the contents of a text string into a list of 'words'
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121 '''
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122 if ftype == 'text/plain':
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123 words = self.text_splitter(text)
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124 else:
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125 return []
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126 return words
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127
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128 def text_splitter(self, text):
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129 """Split text/plain string into a list of words
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130 """
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131 # case insensitive
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132 text = str(text).upper()
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133
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134 # Split the raw text, losing anything longer than 25 characters
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135 # since that'll be gibberish (encoded text or somesuch) or shorter
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136 # than 3 characters since those short words appear all over the
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137 # place
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138 return re.findall(r'\b\w{2,25}\b', text)
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139
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140 def search(self, search_terms, klass, ignore={},
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141 dre=re.compile(r'([^\d]+)(\d+)')):
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142 '''Display search results looking for [search, terms] associated
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143 with the hyperdb Class "klass". Ignore hits on {class: property}.
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144
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145 "dre" is a helper, not an argument.
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146 '''
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147 # do the index lookup
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148 hits = self.find(search_terms)
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149 if not hits:
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150 return {}
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151
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152 designator_propname = {}
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153 for nm, propclass in klass.getprops().items():
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154 if isinstance(propclass, Link) or isinstance(propclass, Multilink):
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155 designator_propname[propclass.classname] = nm
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156
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157 # build a dictionary of nodes and their associated messages
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158 # and files
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159 nodeids = {} # this is the answer
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160 propspec = {} # used to do the klass.find
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161 for propname in designator_propname.values():
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162 propspec[propname] = {} # used as a set (value doesn't matter)
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163 for classname, nodeid, property in hits.values():
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164 # skip this result if we don't care about this class/property
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165 if ignore.has_key((classname, property)):
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166 continue
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167
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168 # if it's a property on klass, it's easy
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169 if classname == klass.classname:
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170 if not nodeids.has_key(nodeid):
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171 nodeids[nodeid] = {}
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172 continue
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173
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174 # make sure the class is a linked one, otherwise ignore
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175 if not designator_propname.has_key(classname):
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176 continue
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177
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178 # it's a linked class - set up to do the klass.find
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179 linkprop = designator_propname[classname] # eg, msg -> messages
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180 propspec[linkprop][nodeid] = 1
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181
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182 # retain only the meaningful entries
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183 for propname, idset in propspec.items():
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184 if not idset:
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185 del propspec[propname]
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186
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187 # klass.find tells me the klass nodeids the linked nodes relate to
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188 for resid in klass.find(**propspec):
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189 resid = str(resid)
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190 if not nodeids.has_key(id):
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191 nodeids[resid] = {}
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192 node_dict = nodeids[resid]
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193 # now figure out where it came from
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194 for linkprop in propspec.keys():
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195 for nodeid in klass.get(resid, linkprop):
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196 if propspec[linkprop].has_key(nodeid):
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197 # OK, this node[propname] has a winner
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198 if not node_dict.has_key(linkprop):
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199 node_dict[linkprop] = [nodeid]
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200 else:
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201 node_dict[linkprop].append(nodeid)
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202 return nodeids
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203
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204 # we override this to ignore not 2 < word < 25 and also to fix a bug -
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205 # the (fail) case.
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206 def find(self, wordlist):
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207 '''Locate files that match ALL the words in wordlist
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208 '''
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209 if not hasattr(self, 'words'):
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210 self.load_index()
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211 self.load_index(wordlist=wordlist)
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212 entries = {}
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213 hits = None
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214 for word in wordlist:
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215 if not 2 < len(word) < 25:
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216 # word outside the bounds of what we index - ignore
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217 continue
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218 word = word.upper()
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219 entry = self.words.get(word) # For each word, get index
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220 entries[word] = entry # of matching files
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221 if not entry: # Nothing for this one word (fail)
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222 return {}
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223 if hits is None:
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224 hits = {}
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225 for k in entry.keys():
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226 if not self.fileids.has_key(k):
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227 raise ValueError, 'Index is corrupted: re-generate it'
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228 hits[k] = self.fileids[k]
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229 else:
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230 # Eliminate hits for every non-match
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231 for fileid in hits.keys():
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232 if not entry.has_key(fileid):
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233 del hits[fileid]
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234 if hits is None:
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235 return {}
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236 return hits
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237
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238 segments = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#_-!"
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239 def load_index(self, reload=0, wordlist=None):
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240 # Unless reload is indicated, do not load twice
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241 if self.index_loaded() and not reload:
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242 return 0
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243
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244 # Ok, now let's actually load it
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245 db = {'WORDS': {}, 'FILES': {'_TOP':(0,None)}, 'FILEIDS': {}}
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246
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247 # Identify the relevant word-dictionary segments
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248 if not wordlist:
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249 segments = self.segments
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250 else:
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251 segments = ['-','#']
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252 for word in wordlist:
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253 segments.append(word[0].upper())
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254
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255 # Load the segments
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256 for segment in segments:
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257 try:
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258 f = open(self.indexdb + segment, 'rb')
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259 except IOError, error:
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260 # probably just nonexistent segment index file
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261 if error.errno != errno.ENOENT: raise
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262 else:
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263 pickle_str = zlib.decompress(f.read())
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264 f.close()
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265 dbslice = marshal.loads(pickle_str)
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266 if dbslice.get('WORDS'):
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267 # if it has some words, add them
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268 for word, entry in dbslice['WORDS'].items():
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269 db['WORDS'][word] = entry
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270 if dbslice.get('FILES'):
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271 # if it has some files, add them
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272 db['FILES'] = dbslice['FILES']
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273 if dbslice.get('FILEIDS'):
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274 # if it has fileids, add them
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275 db['FILEIDS'] = dbslice['FILEIDS']
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276
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277 self.words = db['WORDS']
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278 self.files = db['FILES']
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279 self.fileids = db['FILEIDS']
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280 self.changed = 0
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281
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282 def save_index(self):
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283 # only save if the index is loaded and changed
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284 if not self.index_loaded() or not self.changed:
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285 return
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286
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287 # brutal space saver... delete all the small segments
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288 for segment in self.segments:
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289 try:
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290 os.remove(self.indexdb + segment)
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291 except OSError, error:
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292 # probably just nonexistent segment index file
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293 if error.errno != errno.ENOENT: raise
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294
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295 # First write the much simpler filename/fileid dictionaries
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296 dbfil = {'WORDS':None, 'FILES':self.files, 'FILEIDS':self.fileids}
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297 open(self.indexdb+'-','wb').write(zlib.compress(marshal.dumps(dbfil)))
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298
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299 # The hard part is splitting the word dictionary up, of course
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300 letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#_"
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301 segdicts = {} # Need batch of empty dicts
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302 for segment in letters:
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303 segdicts[segment] = {}
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304 for word, entry in self.words.items(): # Split into segment dicts
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305 initchar = word[0].upper()
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306 segdicts[initchar][word] = entry
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307
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308 # save
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309 for initchar in letters:
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310 db = {'WORDS':segdicts[initchar], 'FILES':None, 'FILEIDS':None}
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311 pickle_str = marshal.dumps(db)
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312 filename = self.indexdb + initchar
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313 pickle_fh = open(filename, 'wb')
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314 pickle_fh.write(zlib.compress(pickle_str))
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315 os.chmod(filename, 0664)
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316
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317 # save done
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318 self.changed = 0
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319
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320 def purge_entry(self, identifier):
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321 '''Remove a file from file index and word index
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322 '''
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323 self.load_index()
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324
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325 if not self.files.has_key(identifier):
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326 return
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327
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328 file_index = self.files[identifier][0]
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329 del self.files[identifier]
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330 del self.fileids[file_index]
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331
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332 # The much harder part, cleanup the word index
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333 for key, occurs in self.words.items():
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334 if occurs.has_key(file_index):
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335 del occurs[file_index]
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336
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337 # save needed
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338 self.changed = 1
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339
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340 def index_loaded(self):
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341 return (hasattr(self,'fileids') and hasattr(self,'files') and
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342 hasattr(self,'words'))
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343
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344
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345 def rollback(self):
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346 ''' load last saved index info. '''
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347 self.load_index(reload=1)
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348
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349 # vim: set filetype=python ts=4 sw=4 et si
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