Koha/ElasticSearch/Indexer.pm

   1 package Koha::ElasticSearch::Indexer;
   2
   3 # Copyright 2013 Catalyst IT
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it under the
   8 # terms of the GNU General Public License as published by the Free Software
   9 # Foundation; either version 3 of the License, or (at your option) any later
  10 # version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  14 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License along
  17 # with Koha; if not, write to the Free Software Foundation, Inc.,
  18 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20 use Carp;
  21 use Modern::Perl;
  22 use base qw(Koha::ElasticSearch);
  23 use Data::Dumper;
  24
  25 # For now just marc, but we can do anything here really
  26 use Catmandu::Importer::MARC;
  27 use Catmandu::Store::ElasticSearch;
  28
  29 Koha::ElasticSearch::Indexer->mk_accessors(qw( store ));
  30
  31 =head1 NAME
  32
  33 Koha::ElasticSearch::Indexer - handles adding new records to the index
  34
  35 =head1 SYNOPSIS
  36
  37     my $indexer = Koha::ElasticSearch::Indexer->new(
  38         { index => Koha::SearchEngine::BIBLIOS_INDEX } );
  39     $indexer->drop_index();
  40     $indexer->update_index(\@biblionumbers, \@records);
  41
  42 =head1 FUNCTIONS
  43
  44 =head2 $indexer->update_index($biblionums, $records);
  45
  46 C<$biblionums> is an arrayref containing the biblionumbers for the records.
  47
  48 C<$records> is an arrayref containing the L<MARC::Record>s themselves.
  49
  50 The values in the arrays must match up, and the 999$c value in the MARC record
  51 will be rewritten using the values in C<$biblionums> to ensure they are correct.
  52 If C<$biblionums> is C<undef>, this won't happen, but you should be sure that
  53 999$c is correct on your own then.
  54
  55 Note that this will modify the original record if C<$biblionums> is supplied.
  56 If that's a problem, clone them first.
  57
  58 =cut
  59
  60 sub update_index {
  61     my ($self, $biblionums, $records) = @_;
  62
  63     # TODO should have a separate path for dealing with a large number
  64     # of records at once where we use the bulk update functions in ES.
  65     if ($biblionums) {
  66         $self->_sanitise_records($biblionums, $records);
  67     }
  68
  69     my $from    = $self->_convert_marc_to_json($records);
  70     if ( !$self->store ) {
  71         my $params  = $self->get_elasticsearch_params();
  72         $self->store(
  73             Catmandu::Store::ElasticSearch->new(
  74                 %$params,
  75                 index_settings => $self->get_elasticsearch_settings(),
  76                 index_mappings => $self->get_elasticsearch_mappings(),
  77             )
  78         );
  79     }
  80     $self->store->bag->add_many($from);
  81     $self->store->bag->commit;
  82     return 1;
  83 }
  84
  85 =head2 $indexer->update_index_background($biblionums, $records)
  86
  87 This has exactly the same API as C<update_index_background> however it'll
  88 return immediately. It'll start a background process that does the adding.
  89
  90 If it fails to add to Elasticsearch then it'll add to a queue that will cause
  91 it to be updated by a regular index cron job in the future.
  92
  93 # TODO implement in the future - I don't know the best way of doing this yet.
  94 # If fork: make sure process group is changed so apache doesn't wait for us.
  95
  96 =cut
  97
  98 sub update_index_background {
  99     my $self = shift;
 100     $self->update_index(@_);
 101 }
 102
 103 =head2 $indexer->delete_index($biblionums)
 104
 105 C<$biblionums> is an arrayref of biblionumbers to delete from the index.
 106
 107 =cut
 108
 109 sub delete_index {
 110     my ($self, $biblionums) = @_;
 111
 112     if ( !$self->store ) {
 113         my $params  = $self->get_elasticsearch_params();
 114         $self->store(
 115             Catmandu::Store::ElasticSearch->new(
 116                 %$params,
 117                 index_settings => $self->get_elasticsearch_settings(),
 118                 index_mappings => $self->get_elasticsearch_mappings(),
 119             )
 120         );
 121     }
 122     $self->store->bag->delete($_) foreach @$biblionums;
 123     $self->store->bag->commit;
 124 }
 125
 126 =head2 $indexer->delete_index_background($biblionums)
 127
 128 Identical to L<delete_index>, this will return immediately and start a
 129 background process to do the actual deleting.
 130
 131 =cut
 132
 133 # TODO implement in the future
 134
 135 sub delete_index_background {
 136     my $self = shift;
 137     $self->delete_index(@_);
 138 }
 139
 140 =head2 $indexer->drop_index();
 141
 142 Drops the index from the elasticsearch server. Calling C<update_index>
 143 after this will recreate it again.
 144
 145 =cut
 146
 147 sub drop_index {
 148     my ($self) = @_;
 149
 150     if (!$self->store) {
 151         # If this index doesn't exist, this will create it. Then it'll be
 152         # deleted. That's not the end of the world however.
 153         my $params  = $self->get_elasticsearch_params();
 154         $self->store(
 155             Catmandu::Store::ElasticSearch->new(
 156                 %$params,
 157                 index_settings => $self->get_elasticsearch_settings(),
 158                 index_mappings => $self->get_elasticsearch_mappings(),
 159             )
 160         );
 161     }
 162     $self->store->drop();
 163     $self->store(undef);
 164 }
 165
 166 sub _sanitise_records {
 167     my ($self, $biblionums, $records) = @_;
 168
 169     confess "Unequal number of values in \$biblionums and \$records." if (@$biblionums != @$records);
 170
 171     my $c = @$biblionums;
 172     for (my $i=0; $i<$c; $i++) {
 173         my $bibnum = $biblionums->[$i];
 174         my $rec = $records->[$i];
 175         # I've seen things you people wouldn't believe. Attack ships on fire
 176         # off the shoulder of Orion. I watched C-beams glitter in the dark near
 177         # the Tannhauser gate. MARC records where 999$c doesn't match the
 178         # biblionumber column. All those moments will be lost in time... like
 179         # tears in rain...
 180         $rec->delete_fields($rec->field('999'));
 181         $rec->append_fields(MARC::Field->new('999','','','c' => $bibnum, 'd' => $bibnum));
 182     }
 183 }
 184
 185 sub _convert_marc_to_json {
 186     my $self    = shift;
 187     my $records = shift;
 188     my $importer =
 189       Catmandu::Importer::MARC->new( records => $records, id => '999c' );
 190     my $fixer = Catmandu::Fix->new( fixes => $self->get_fixer_rules() );
 191     $importer = $fixer->fix($importer);
 192     return $importer;
 193 }
 194
 195 1;
 196
 197 __END__
 198
 199 =head1 AUTHOR
 200
 201 =over 4
 202
 203 =item Chris Cormack C<< <chrisc@catalyst.net.nz> >>
 204
 205 =item Robin Sheat C<< <robin@catalyst.net.nz> >>
 206
 207 =back