Mercurial > p > roundup > code

annotate roundup/backends/back_tsearch2.py @ 4098:3a4e006bbba0

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Fix issue1895192.
author Stefan Seefeld <stefan@seefeld.name>
date Thu, 12 Mar 2009 18:19:37 +0000
parents a8c2371f45b6
children 6e3e4f24c753
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #$Id: back_tsearch2.py,v 1.9 2005-01-08 16:16:59 jlgijsbers Exp $
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2
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3 # Note: this backend is EXPERIMENTAL. Do not use if you value your data.
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4 import re
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5
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6 import psycopg
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7
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8 from roundup import hyperdb
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9 from roundup.support import ensureParentsExist
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10 from roundup.backends import back_postgresql, tsearch2_setup, indexer_rdbms
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11 from roundup.backends.back_postgresql import db_create, db_nuke, db_command
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12 from roundup.backends.back_postgresql import pg_command, db_exists, Class, IssueClass, FileClass
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13 from roundup.backends.indexer_common import _isLink, Indexer
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14
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15 # XXX: Should probably be on the Class class.
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16 def _indexedProps(spec):
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17 """Get a list of properties to be indexed on 'spec'."""
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18 return [prop for prop, propclass in spec.getprops().items()
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19 if isinstance(propclass, hyperdb.String) and propclass.indexme]
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20
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21 def _getQueryDict(spec):
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22 """Get a convenience dictionary for creating tsearch2 indexes."""
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23 query_dict = {'classname': spec.classname,
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24 'indexedColumns': ['_' + prop for prop in _indexedProps(spec)]}
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25 query_dict['tablename'] = "_%(classname)s" % query_dict
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26 query_dict['triggername'] = "%(tablename)s_tsvectorupdate" % query_dict
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27 return query_dict
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28
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29 class Database(back_postgresql.Database):
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30 def __init__(self, config, journaltag=None):
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31 back_postgresql.Database.__init__(self, config, journaltag)
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32 self.indexer = Indexer(self)
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33
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34 def create_version_2_tables(self):
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35 back_postgresql.Database.create_version_2_tables(self)
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36 tsearch2_setup.setup(self.cursor)
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37
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38 def create_class_table_indexes(self, spec):
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39 back_postgresql.Database.create_class_table_indexes(self, spec)
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40 self.cursor.execute("""CREATE INDEX _%(classname)s_idxFTI_idx
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41 ON %(tablename)s USING gist(idxFTI);""" %
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42 _getQueryDict(spec))
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43
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44 self.create_tsearch2_trigger(spec)
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45
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46 def create_tsearch2_trigger(self, spec):
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47 d = _getQueryDict(spec)
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48 if d['indexedColumns']:
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49
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50 d['joined'] = " || ' ' ||".join(d['indexedColumns'])
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51 query = """UPDATE %(tablename)s
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52 SET idxFTI = to_tsvector('default', %(joined)s)""" % d
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53 self.cursor.execute(query)
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54
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55 d['joined'] = ", ".join(d['indexedColumns'])
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56 query = """CREATE TRIGGER %(triggername)s
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57 BEFORE UPDATE OR INSERT ON %(tablename)s
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58 FOR EACH ROW EXECUTE PROCEDURE
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59 tsearch2(idxFTI, %(joined)s);""" % d
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60 self.cursor.execute(query)
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61
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62 def drop_tsearch2_trigger(self, spec):
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63 # Check whether the trigger exists before trying to drop it.
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64 query_dict = _getQueryDict(spec)
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65 self.sql("""SELECT tgname FROM pg_catalog.pg_trigger
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66 WHERE tgname = '%(triggername)s'""" % query_dict)
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67 if self.cursor.fetchall():
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68 self.sql("""DROP TRIGGER %(triggername)s ON %(tablename)s""" %
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69 query_dict)
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70
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71 def update_class(self, spec, old_spec, force=0):
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72 result = back_postgresql.Database.update_class(self, spec, old_spec, force)
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73
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74 # Drop trigger...
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75 self.drop_tsearch2_trigger(spec)
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76
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77 # and recreate if necessary.
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78 self.create_tsearch2_trigger(spec)
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79
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80 return result
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81
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82 def determine_all_columns(self, spec):
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83 cols, mls = back_postgresql.Database.determine_all_columns(self, spec)
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84 cols.append(('idxFTI', 'tsvector'))
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85 return cols, mls
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86
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87 class Indexer(Indexer):
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88 def __init__(self, db):
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89 self.db = db
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90
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91 # This indexer never needs to reindex.
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92 def should_reindex(self):
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93 return 0
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94
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95 def getHits(self, search_terms, klass):
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96 return self.find(search_terms, klass)
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97
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98 def find(self, search_terms, klass):
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99 if not search_terms:
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100 return None
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101
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102 hits = self.tsearchQuery(klass.classname, search_terms)
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103 designator_propname = {}
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104
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105 for nm, propclass in klass.getprops().items():
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106 if _isLink(propclass):
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107 hits.extend(self.tsearchQuery(propclass.classname, search_terms))
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108
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109 return hits
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110
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111 def tsearchQuery(self, classname, search_terms):
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112 query = """SELECT id FROM _%(classname)s
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113 WHERE idxFTI @@ to_tsquery('default', '%(terms)s')"""
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114
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115 query = query % {'classname': classname,
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116 'terms': ' & '.join(search_terms)}
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117 self.db.cursor.execute(query)
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118 klass = self.db.getclass(classname)
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119 nodeids = [str(row[0]) for row in self.db.cursor.fetchall()]
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120
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121 # filter out files without text/plain mime type
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122 # XXX: files without text/plain shouldn't be indexed at all, we
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123 # should take care of this in the trigger
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124 if klass.getprops().has_key('type'):
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125 nodeids = [nodeid for nodeid in nodeids
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126 if klass.get(nodeid, 'type') == 'text/plain']
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127
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128 # XXX: We haven't implemented property-level search, so I'm just faking
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129 # it here with a property named 'XXX'. We still need to fix the other
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130 # backends and indexer_common.Indexer.search to only want to unpack two
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131 # values.
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132 return [(classname, nodeid, 'XXX') for nodeid in nodeids]
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133
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134 # These only exist to satisfy the interface that's expected from indexers.
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135 def force_reindex(self):
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136 pass
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137
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138 def add_text(self, identifier, text, mime_type=None):
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139 pass
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140
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141 def close(self):
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142 pass
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143
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144 class FileClass(hyperdb.FileClass, Class):
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145 '''This class defines a large chunk of data. To support this, it has a
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146 mandatory String property "content" which is typically saved off
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147 externally to the hyperdb.
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148
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149 However, this implementation just stores it in the hyperdb.
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150 '''
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151 def __init__(self, db, classname, **properties):
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152 '''The newly-created class automatically includes the "content" property.,
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153 '''
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154 properties['content'] = hyperdb.String(indexme='yes')
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155 Class.__init__(self, db, classname, **properties)
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156
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157 default_mime_type = 'text/plain'
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158 def create(self, **propvalues):
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159 # figure the mime type
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160 if self.getprops().has_key('type') and not propvalues.get('type'):
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161 propvalues['type'] = self.default_mime_type
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162 return Class.create(self, **propvalues)
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163
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164 def export_files(self, dirname, nodeid):
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165 dest = self.exportFilename(dirname, nodeid)
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166 ensureParentsExist(dest)
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167 fp = open(dest, "w")
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168 fp.write(self.get(nodeid, "content", default=''))
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169 fp.close()
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170
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171 def import_files(self, dirname, nodeid):
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172 source = self.exportFilename(dirname, nodeid)
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173
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174 fp = open(source, "r")
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175 # Use Database.setnode instead of self.set or self.set_inner here, as
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176 # Database.setnode doesn't update the "activity" or "actor" properties.
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177 self.db.setnode(self.classname, nodeid, values={'content': fp.read()})
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178 fp.close()
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