Mercurial > p > roundup > code

annotate roundup/backends/indexer_xapian.py @ 7021:4e25815961a7

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flake8: remove trailing whitespace; blank lines for definitions E305 expected 2 blank lines after class or function definition, found 1 E306 expected 1 blank line before a nested definition, found 0 W291 trailing whitespace
author John Rouillard <rouilj@ieee.org>
date Sun, 09 Oct 2022 17:30:47 -0400
parents 0b6c54893ec5
children 1505f6ab86ec
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 os
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4 import re
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5 import time
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6 import xapian
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7
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8 from roundup.anypy.strings import b2s, s2b
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9 from roundup.backends.indexer_common import Indexer as IndexerBase
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10 from roundup.i18n import _
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11
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12 # TODO: we need to delete documents when a property is *reindexed*
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13
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14 # Note that Xapian always uses UTF-8 encoded string, see
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15 # https://xapian.org/docs/bindings/python3/introduction.html#strings:
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16 # "Where std::string is returned, it's always mapped to bytes in
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17 # Python..."
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18
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19
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20 class Indexer(IndexerBase):
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21 def __init__(self, db):
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22 IndexerBase.__init__(self, db)
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23 self.db_path = db.config.DATABASE
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24 self.reindex = 0
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25 self.transaction_active = False
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26
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27 def _get_database(self):
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28 index = os.path.join(self.db_path, 'text-index')
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29 for n in range(10):
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30 try:
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31 # if successful return
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32 return xapian.WritableDatabase(index, xapian.DB_CREATE_OR_OPEN)
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33 except xapian.DatabaseLockError:
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34 # adaptive sleep. Get longer as count increases.
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35 time_to_sleep = 0.01 * (2 << min(5, n))
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36 time.sleep(time_to_sleep)
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37 # we are back to the for loop
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38
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39 # Get here only if we dropped out of the for loop.
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40 raise xapian.DatabaseLockError(_(
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41 "Unable to get lock after 10 retries on %s.") % index)
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42
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43 def save_index(self):
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44 '''Save the changes to the index.'''
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45 if not self.transaction_active:
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46 return
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47 database = self._get_database()
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48 database.commit_transaction()
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49 self.transaction_active = False
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50
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51 def close(self):
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52 '''close the indexing database'''
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53 pass
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54
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55 def rollback(self):
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56 if not self.transaction_active:
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57 return
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58 database = self._get_database()
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59 database.cancel_transaction()
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60 self.transaction_active = False
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61
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62 def force_reindex(self):
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63 '''Force a reindexing of the database. This essentially
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64 empties the tables ids and index and sets a flag so
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65 that the databases are reindexed'''
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66 self.reindex = 1
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67
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68 def should_reindex(self):
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69 '''returns True if the indexes need to be rebuilt'''
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70 return self.reindex
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71
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72 def add_text(self, identifier, text, mime_type='text/plain'):
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73 ''' "identifier" is (classname, itemid, property) '''
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74 if mime_type != 'text/plain':
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75 return
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76 if not text:
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77 text = ''
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78
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79 # open the database and start a transaction if needed
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80 database = self._get_database()
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81
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82 # XXX: Xapian now supports transactions,
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83 # but there is a call to save_index() missing.
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84 # if not self.transaction_active:
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85 # database.begin_transaction()
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86 # self.transaction_active = True
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87
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88 stemmer = xapian.Stem(self.language)
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89
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90 # We use the identifier twice: once in the actual "text" being
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91 # indexed so we can search on it, and again as the "data" being
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92 # indexed so we know what we're matching when we get results
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93 identifier = s2b('%s:%s:%s' % identifier)
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94
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95 # create the new document
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96 doc = xapian.Document()
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97 doc.set_data(identifier)
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98 doc.add_term(identifier, 0)
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99
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100 for match in re.finditer(r'\b\w{%d,%d}\b'
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101 % (self.minlength, self.maxlength),
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102 text.upper(), re.UNICODE):
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103 word = match.group(0)
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104 if self.is_stopword(word):
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105 continue
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106 term = stemmer(s2b(word.lower()))
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107 doc.add_posting(term, match.start(0))
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108
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109 database.replace_document(identifier, doc)
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110
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111 def find(self, wordlist):
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112 '''look up all the words in the wordlist.
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113 If none are found return an empty dictionary
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114 * more rules here
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115 '''
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116 if not wordlist:
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117 return {}
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118
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119 database = self._get_database()
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120
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121 enquire = xapian.Enquire(database)
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122 stemmer = xapian.Stem(self.language)
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123 terms = []
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124 for term in [word.upper() for word in wordlist
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125 if self.minlength <= len(word) <= self.maxlength]:
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126 if not self.is_stopword(term):
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127 terms.append(stemmer(s2b(term.lower())))
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128 query = xapian.Query(xapian.Query.OP_AND, terms)
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129
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130 enquire.set_query(query)
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131 matches = enquire.get_mset(0, database.get_doccount())
3295
a615cc230160 added Xapian indexer; replaces standard indexers if Xapian is available
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
132
5491
e72573996caf fixed encoding issues for Xapian indexer
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5142
diff changeset
133 return [tuple(b2s(m.document.get_data()).split(':'))
6979
0b6c54893ec5 flake8 - also added translation to an error string.
John Rouillard <rouilj@ieee.org>
parents: 6356
diff changeset
134 for m in matches]
Roundup Issue Tracker: http://roundup-tracker.org/