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annotate roundup/backends/indexer_xapian.py @ 6478:a35d4e0c4e07

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Fix permissions check. Use role not perm check.
author John Rouillard <rouilj@ieee.org>
date Mon, 30 Aug 2021 16:17:46 -0400
parents c26b9ce33ae3
children 0b6c54893ec5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ''' This implements the full-text indexer using the Xapian indexer.
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2 '''
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3 import re, os, time
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4
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5 import xapian
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6
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7 from roundup.backends.indexer_common import Indexer as IndexerBase
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8 from roundup.anypy.strings import b2s, s2b
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9 from roundup.i18n import _
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10
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11 # TODO: we need to delete documents when a property is *reindexed*
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12
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13 # Note that Xapian always uses UTF-8 encoded string, see
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14 # https://xapian.org/docs/bindings/python3/introduction.html#strings:
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15 # "Where std::string is returned, it's always mapped to bytes in
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16 # Python..."
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17
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18 class Indexer(IndexerBase):
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19 def __init__(self, db):
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20 IndexerBase.__init__(self, db)
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21 self.db_path = db.config.DATABASE
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22 self.reindex = 0
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23 self.transaction_active = False
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24
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25 def _get_database(self):
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26 index = os.path.join(self.db_path, 'text-index')
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27 for n in range(10):
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28 try:
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29 # if successful return
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30 return xapian.WritableDatabase(index, xapian.DB_CREATE_OR_OPEN)
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31 except xapian.DatabaseLockError:
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32 # adaptive sleep. Get longer as count increases.
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33 time_to_sleep = 0.01 * (2 << min(5, n))
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34 time.sleep(time_to_sleep)
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35 # we are back to the for loop
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36
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37 # Get here only if we dropped out of the for loop.
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38 raise xapian.DatabaseLockError("Unable to get lock after 10 retries on %s."%index)
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39
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40 def save_index(self):
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41 '''Save the changes to the index.'''
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42 if not self.transaction_active:
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43 return
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44 database = self._get_database()
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45 database.commit_transaction()
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46 self.transaction_active = False
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47
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48 def close(self):
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49 '''close the indexing database'''
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50 pass
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51
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52 def rollback(self):
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53 if not self.transaction_active:
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54 return
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55 database = self._get_database()
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56 database.cancel_transaction()
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57 self.transaction_active = False
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58
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59 def force_reindex(self):
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60 '''Force a reindexing of the database. This essentially
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61 empties the tables ids and index and sets a flag so
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62 that the databases are reindexed'''
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63 self.reindex = 1
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64
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65 def should_reindex(self):
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66 '''returns True if the indexes need to be rebuilt'''
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67 return self.reindex
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68
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69 def add_text(self, identifier, text, mime_type='text/plain'):
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70 ''' "identifier" is (classname, itemid, property) '''
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71 if mime_type != 'text/plain':
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72 return
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73 if not text: text = ''
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74
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75 # open the database and start a transaction if needed
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76 database = self._get_database()
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78 # XXX: Xapian now supports transactions,
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79 # but there is a call to save_index() missing.
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80 #if not self.transaction_active:
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81 #database.begin_transaction()
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82 #self.transaction_active = True
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83
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84 stemmer = xapian.Stem(self.language)
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85
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86 # We use the identifier twice: once in the actual "text" being
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87 # indexed so we can search on it, and again as the "data" being
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88 # indexed so we know what we're matching when we get results
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89 identifier = s2b('%s:%s:%s'%identifier)
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90
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91 # create the new document
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92 doc = xapian.Document()
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93 doc.set_data(identifier)
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94 doc.add_term(identifier, 0)
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95
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96 for match in re.finditer(r'\b\w{%d,%d}\b'
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97 % (self.minlength, self.maxlength),
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98 text.upper(), re.UNICODE):
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99 word = match.group(0)
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100 if self.is_stopword(word):
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101 continue
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102 term = stemmer(s2b(word.lower()))
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103 doc.add_posting(term, match.start(0))
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104
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105 database.replace_document(identifier, doc)
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106
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107 def find(self, wordlist):
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108 '''look up all the words in the wordlist.
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109 If none are found return an empty dictionary
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110 * more rules here
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111 '''
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112 if not wordlist:
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113 return {}
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114
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115 database = self._get_database()
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116
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117 enquire = xapian.Enquire(database)
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118 stemmer = xapian.Stem(self.language)
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119 terms = []
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120 for term in [word.upper() for word in wordlist
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121 if self.minlength <= len(word) <= self.maxlength]:
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122 if not self.is_stopword(term):
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123 terms.append(stemmer(s2b(term.lower())))
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124 query = xapian.Query(xapian.Query.OP_AND, terms)
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125
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126 enquire.set_query(query)
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127 matches = enquire.get_mset(0, database.get_doccount())
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128
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129 return [tuple(b2s(m.document.get_data()).split(':'))
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130 for m in matches]
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131
Roundup Issue Tracker: http://roundup-tracker.org/