1 package Koha::SearchEngine::Elasticsearch;
3 # Copyright 2015 Catalyst IT
5 # This file is part of Koha.
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
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.
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.
20 use base qw(Class::Accessor);
25 use Koha::Exceptions::Config;
26 use Koha::Exceptions::Elasticsearch;
27 use Koha::SearchFields;
28 use Koha::SearchMarcMaps;
35 use Search::Elasticsearch;
39 use List::Util qw( sum0 reduce );
42 use Encode qw(encode);
45 __PACKAGE__->mk_ro_accessors(qw( index ));
46 __PACKAGE__->mk_accessors(qw( sort_fields ));
48 # Constants to refer to the standard index names
49 Readonly our $BIBLIOS_INDEX => 'biblios';
50 Readonly our $AUTHORITIES_INDEX => 'authorities';
54 Koha::SearchEngine::Elasticsearch - Base module for things using elasticsearch
62 The name of the index to use, generally 'biblios' or 'authorities'.
72 my $self = $class->SUPER::new(@_);
73 # Check for a valid index
74 Koha::Exceptions::MissingParameter->throw('No index name provided') unless $self->index;
78 =head2 get_elasticsearch
80 my $elasticsearch_client = $self->get_elasticsearch();
82 Returns a C<Search::Elasticsearch> client. The client is cached on a C<Koha::SearchEngine::ElasticSearch>
83 instance level and will be reused if method is called multiple times.
87 sub get_elasticsearch {
89 unless (defined $self->{elasticsearch}) {
90 my $conf = $self->get_elasticsearch_params();
91 $self->{elasticsearch} = Search::Elasticsearch->new($conf);
93 return $self->{elasticsearch};
96 =head2 get_elasticsearch_params
98 my $params = $self->get_elasticsearch_params();
100 This provides a hashref that contains the parameters for connecting to the
101 ElasicSearch servers, in the form:
104 'nodes' => ['127.0.0.1:9200', 'anotherserver:9200'],
105 'index_name' => 'koha_instance_index',
108 This is configured by the following in the C<config> block in koha-conf.xml:
111 <server>127.0.0.1:9200</server>
112 <server>anotherserver:9200</server>
113 <index_name>koha_instance</index_name>
118 sub get_elasticsearch_params {
121 # Copy the hash so that we're not modifying the original
122 my $conf = C4::Context->config('elasticsearch');
123 die "No 'elasticsearch' block is defined in koha-conf.xml.\n" if ( !$conf );
124 my $es = { %{ $conf } };
126 # Helpfully, the multiple server lines end up in an array for us anyway
127 # if there are multiple ones, but not if there's only one.
128 my $server = $es->{server};
129 delete $es->{server};
130 if ( ref($server) eq 'ARRAY' ) {
132 # store it called 'nodes' (which is used by newer Search::Elasticsearch)
133 $es->{nodes} = $server;
136 $es->{nodes} = [$server];
139 die "No elasticsearch servers were specified in koha-conf.xml.\n";
141 die "No elasticsearch index_name was specified in koha-conf.xml.\n"
142 if ( !$es->{index_name} );
143 # Append the name of this particular index to our namespace
144 $es->{index_name} .= '_' . $self->index;
146 $es->{key_prefix} = 'es_';
147 $es->{client} //= '5_0::Direct';
148 $es->{cxn_pool} //= 'Static';
149 $es->{request_timeout} //= 60;
154 =head2 get_elasticsearch_settings
156 my $settings = $self->get_elasticsearch_settings();
158 This provides the settings provided to Elasticsearch when an index is created.
159 These can do things like define tokenization methods.
161 A hashref containing the settings is returned.
165 sub get_elasticsearch_settings {
168 # Use state to speed up repeated calls
169 state $settings = undef;
170 if (!defined $settings) {
171 my $config_file = C4::Context->config('elasticsearch_index_config');
172 $config_file ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/index_config.yaml';
173 $settings = LoadFile( $config_file );
179 =head2 get_elasticsearch_mappings
181 my $mappings = $self->get_elasticsearch_mappings();
183 This provides the mappings that get passed to Elasticsearch when an index is
188 sub get_elasticsearch_mappings {
191 # Use state to speed up repeated calls
195 if (!defined $all_mappings{$self->index}) {
196 $sort_fields{$self->index} = {};
197 # Clone the general mapping to break ties with the original hash
199 data => clone(_get_elasticsearch_field_config('general', ''))
201 my $marcflavour = lc C4::Context->preference('marcflavour');
202 $self->_foreach_mapping(
204 my ( $name, $type, $facet, $suggestible, $sort, $search, $marc_type ) = @_;
205 return if $marc_type ne $marcflavour;
206 # TODO if this gets any sort of complexity to it, it should
207 # be broken out into its own function.
209 # TODO be aware of date formats, but this requires pre-parsing
210 # as ES will simply reject anything with an invalid date.
211 my $es_type = 'text';
212 if ($type eq 'boolean') {
213 $es_type = 'boolean';
214 } elsif ($type eq 'number' || $type eq 'sum') {
215 $es_type = 'integer';
216 } elsif ($type eq 'isbn' || $type eq 'stdno') {
221 $mappings->{data}{properties}{$name} = _get_elasticsearch_field_config('search', $es_type);
225 $mappings->{data}{properties}{ $name . '__facet' } = _get_elasticsearch_field_config('facet', $es_type);
228 $mappings->{data}{properties}{ $name . '__suggestion' } = _get_elasticsearch_field_config('suggestible', $es_type);
230 # Sort is a bit special as it can be true, false, undef.
231 # We care about "true" or "undef",
232 # "undef" means to do the default thing, which is make it sortable.
233 if (!defined $sort || $sort) {
234 $mappings->{data}{properties}{ $name . '__sort' } = _get_elasticsearch_field_config('sort', $es_type);
235 $sort_fields{$self->index}{$name} = 1;
239 $all_mappings{$self->index} = $mappings;
241 $self->sort_fields(\%{$sort_fields{$self->index}});
243 return $all_mappings{$self->index};
246 =head2 _get_elasticsearch_field_config
248 Get the Elasticsearch field config for the given purpose and data type.
250 $mapping = _get_elasticsearch_field_config('search', 'text');
254 sub _get_elasticsearch_field_config {
256 my ( $purpose, $type ) = @_;
258 # Use state to speed up repeated calls
259 state $settings = undef;
260 if (!defined $settings) {
261 my $config_file = C4::Context->config('elasticsearch_field_config');
262 $config_file ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/field_config.yaml';
263 $settings = LoadFile( $config_file );
266 if (!defined $settings->{$purpose}) {
267 die "Field purpose $purpose not defined in field config";
270 return $settings->{$purpose};
272 if (defined $settings->{$purpose}{$type}) {
273 return $settings->{$purpose}{$type};
275 if (defined $settings->{$purpose}{'default'}) {
276 return $settings->{$purpose}{'default'};
281 =head2 _load_elasticsearch_mappings
283 Load Elasticsearch mappings in the format of mappings.yaml.
285 $indexes = _load_elasticsearch_mappings();
289 sub _load_elasticsearch_mappings {
290 my $mappings_yaml = C4::Context->config('elasticsearch_index_mappings');
291 $mappings_yaml ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/mappings.yaml';
292 return LoadFile( $mappings_yaml );
295 sub reset_elasticsearch_mappings {
297 my $indexes = $self->_load_elasticsearch_mappings();
299 Koha::SearchMarcMaps->delete;
300 Koha::SearchFields->delete;
302 while ( my ( $index_name, $fields ) = each %$indexes ) {
303 while ( my ( $field_name, $data ) = each %$fields ) {
305 my %sf_params = map { $_ => $data->{$_} } grep { exists $data->{$_} } qw/ type label weight staff_client opac facet_order /;
308 $sf_params{staff_client} //= 1;
309 $sf_params{opac} //= 1;
311 $sf_params{name} = $field_name;
313 my $search_field = Koha::SearchFields->find_or_create( \%sf_params, { key => 'name' } );
315 my $mappings = $data->{mappings};
316 for my $mapping ( @$mappings ) {
317 my $marc_field = Koha::SearchMarcMaps->find_or_create({
318 index_name => $index_name,
319 marc_type => $mapping->{marc_type},
320 marc_field => $mapping->{marc_field}
322 $search_field->add_to_search_marc_maps($marc_field, {
323 facet => $mapping->{facet} || 0,
324 suggestible => $mapping->{suggestible} || 0,
325 sort => $mapping->{sort},
326 search => $mapping->{search} // 1
333 # This overrides the accessor provided by Class::Accessor so that if
334 # sort_fields isn't set, then it'll generate it.
338 $self->_sort_fields_accessor(@_);
341 my $val = $self->_sort_fields_accessor();
344 # This will populate the accessor as a side effect
345 $self->get_elasticsearch_mappings();
346 return $self->_sort_fields_accessor();
349 =head2 _process_mappings($mappings, $data, $record_document, $altscript)
351 $self->_process_mappings($mappings, $marc_field_data, $record_document, 0)
353 Process all C<$mappings> targets operating on a specific MARC field C<$data>.
354 Since we group all mappings by MARC field targets C<$mappings> will contain
355 all targets for C<$data> and thus we need to fetch the MARC field only once.
356 C<$mappings> will be applied to C<$record_document> and new field values added.
357 The method has no return value.
363 Arrayref of mappings containing arrayrefs in the format
364 [C<$target>, C<$options>] where C<$target> is the name of the target field and
365 C<$options> is a hashref containing processing directives for this particular
370 The source data from a MARC record field.
372 =item C<$record_document>
374 Hashref representing the Elasticsearch document on which mappings should be
379 A boolean value indicating whether an alternate script presentation is being
386 sub _process_mappings {
387 my ($_self, $mappings, $data, $record_document, $altscript) = @_;
388 foreach my $mapping (@{$mappings}) {
389 my ($target, $options) = @{$mapping};
391 # Don't process sort fields for alternate scripts
392 my $sort = $target =~ /__sort$/;
393 if ($sort && $altscript) {
397 # Copy (scalar) data since can have multiple targets
398 # with differing options for (possibly) mutating data
399 # so need a different copy for each
401 $record_document->{$target} //= [];
402 if (defined $options->{substr}) {
403 my ($start, $length) = @{$options->{substr}};
404 $_data = length($data) > $start ? substr $data, $start, $length : '';
406 if (defined $options->{value_callbacks}) {
407 $_data = reduce { $b->($a) } ($_data, @{$options->{value_callbacks}});
409 if (defined $options->{property}) {
411 $options->{property} => $_data
414 push @{$record_document->{$target}}, $_data;
418 =head2 marc_records_to_documents($marc_records)
420 my $record_documents = $self->marc_records_to_documents($marc_records);
422 Using mappings stored in database convert C<$marc_records> to Elasticsearch documents.
424 Returns array of hash references, representing Elasticsearch documents,
425 acceptable as body payload in C<Search::Elasticsearch> requests.
429 =item C<$marc_documents>
431 Reference to array of C<MARC::Record> objects to be converted to Elasticsearch documents.
437 sub marc_records_to_documents {
438 my ($self, $records) = @_;
439 my $rules = $self->_get_marc_mapping_rules();
440 my $control_fields_rules = $rules->{control_fields};
441 my $data_fields_rules = $rules->{data_fields};
442 my $marcflavour = lc C4::Context->preference('marcflavour');
443 my $use_array = C4::Context->preference('ElasticsearchMARCFormat') eq 'ARRAY';
445 my @record_documents;
447 foreach my $record (@{$records}) {
448 my $record_document = {};
449 my $mappings = $rules->{leader};
451 $self->_process_mappings($mappings, $record->leader(), $record_document, 0);
453 foreach my $field ($record->fields()) {
454 if ($field->is_control_field()) {
455 my $mappings = $control_fields_rules->{$field->tag()};
457 $self->_process_mappings($mappings, $field->data(), $record_document, 0);
461 my $tag = $field->tag();
462 # Handle alternate scripts in MARC 21
464 if ($marcflavour eq 'marc21' && $tag eq '880') {
465 my $sub6 = $field->subfield('6');
466 if ($sub6 =~ /^(...)-\d+/) {
472 my $data_field_rules = $data_fields_rules->{$tag};
474 if ($data_field_rules) {
475 my $subfields_mappings = $data_field_rules->{subfields};
476 my $wildcard_mappings = $subfields_mappings->{'*'};
477 foreach my $subfield ($field->subfields()) {
478 my ($code, $data) = @{$subfield};
479 my $mappings = $subfields_mappings->{$code} // [];
480 if ($wildcard_mappings) {
481 $mappings = [@{$mappings}, @{$wildcard_mappings}];
484 $self->_process_mappings($mappings, $data, $record_document, $altscript);
488 my $subfields_join_mappings = $data_field_rules->{subfields_join};
489 if ($subfields_join_mappings) {
490 foreach my $subfields_group (keys %{$subfields_join_mappings}) {
491 # Map each subfield to values, remove empty values, join with space
496 map { join(' ', $field->subfield($_)) } split(//, $subfields_group)
500 $self->_process_mappings($subfields_join_mappings->{$subfields_group}, $data, $record_document, $altscript);
507 foreach my $field (keys %{$rules->{defaults}}) {
508 unless (defined $record_document->{$field}) {
509 $record_document->{$field} = $rules->{defaults}->{$field};
512 foreach my $field (@{$rules->{sum}}) {
513 if (defined $record_document->{$field}) {
514 # TODO: validate numeric? filter?
515 # TODO: Or should only accept fields without nested values?
516 # TODO: Quick and dirty, improve if needed
517 $record_document->{$field} = sum0(grep { !ref($_) && m/\d+(\.\d+)?/} @{$record_document->{$field}});
520 # Index all applicable ISBN forms (ISBN-10 and ISBN-13 with and without dashes)
521 foreach my $field (@{$rules->{isbn}}) {
522 if (defined $record_document->{$field}) {
524 foreach my $input_isbn (@{$record_document->{$field}}) {
525 my $isbn = Business::ISBN->new($input_isbn);
526 if (defined $isbn && $isbn->is_valid) {
527 my $isbn13 = $isbn->as_isbn13->as_string;
528 push @isbns, $isbn13;
530 push @isbns, $isbn13;
532 my $isbn10 = $isbn->as_isbn10;
534 $isbn10 = $isbn10->as_string;
535 push @isbns, $isbn10;
537 push @isbns, $isbn10;
540 push @isbns, $input_isbn;
543 $record_document->{$field} = \@isbns;
547 # Remove duplicate values and collapse sort fields
548 foreach my $field (keys %{$record_document}) {
549 if (ref($record_document->{$field}) eq 'ARRAY') {
550 @{$record_document->{$field}} = do {
552 grep { !$seen{ref($_) eq 'HASH' && defined $_->{input} ? $_->{input} : $_}++ } @{$record_document->{$field}};
554 if ($field =~ /__sort$/) {
555 # Make sure to keep the sort field length sensible. 255 was chosen as a nice round value.
556 $record_document->{$field} = [substr(join(' ', @{$record_document->{$field}}), 0, 255)];
561 # TODO: Perhaps should check if $records_document non empty, but really should never be the case
562 $record->encoding('UTF-8');
564 $record_document->{'marc_data_array'} = $self->_marc_to_array($record);
565 $record_document->{'marc_format'} = 'ARRAY';
569 # Temporarily intercept all warn signals (MARC::Record carps when record length > 99999)
570 local $SIG{__WARN__} = sub {
571 push @warnings, $_[0];
573 $record_document->{'marc_data'} = encode_base64(encode('UTF-8', $record->as_usmarc()));
576 # Suppress warnings if record length exceeded
577 unless (substr($record->leader(), 0, 5) eq '99999') {
578 foreach my $warning (@warnings) {
582 $record_document->{'marc_data'} = $record->as_xml_record($marcflavour);
583 $record_document->{'marc_format'} = 'MARCXML';
586 $record_document->{'marc_format'} = 'base64ISO2709';
589 push @record_documents, $record_document;
591 return \@record_documents;
594 =head2 _marc_to_array($record)
596 my @fields = _marc_to_array($record)
598 Convert a MARC::Record to an array modeled after MARC-in-JSON
599 (see https://github.com/marc4j/marc4j/wiki/MARC-in-JSON-Description)
605 A MARC::Record object
612 my ($self, $record) = @_;
615 leader => $record->leader(),
618 for my $field ($record->fields()) {
619 my $tag = $field->tag();
620 if ($field->is_control_field()) {
621 push @{$data->{fields}}, {$tag => $field->data()};
624 foreach my $subfield ($field->subfields()) {
625 my ($code, $contents) = @{$subfield};
626 push @{$subfields}, {$code => $contents};
628 push @{$data->{fields}}, {
630 ind1 => $field->indicator(1),
631 ind2 => $field->indicator(2),
632 subfields => $subfields
640 =head2 _array_to_marc($data)
642 my $record = _array_to_marc($data)
644 Convert an array modeled after MARC-in-JSON to a MARC::Record
650 An array modeled after MARC-in-JSON
651 (see https://github.com/marc4j/marc4j/wiki/MARC-in-JSON-Description)
658 my ($self, $data) = @_;
660 my $record = MARC::Record->new();
662 $record->leader($data->{leader});
663 for my $field (@{$data->{fields}}) {
664 my $tag = (keys %{$field})[0];
665 $field = $field->{$tag};
667 if (ref($field) eq 'HASH') {
669 foreach my $subfield (@{$field->{subfields}}) {
670 my $code = (keys %{$subfield})[0];
671 push @subfields, $code;
672 push @subfields, $subfield->{$code};
674 $marc_field = MARC::Field->new($tag, $field->{ind1}, $field->{ind2}, @subfields);
676 $marc_field = MARC::Field->new($tag, $field)
678 $record->append_fields($marc_field);
684 =head2 _field_mappings($facet, $suggestible, $sort, $search, $target_name, $target_type, $range)
686 my @mappings = _field_mappings($facet, $suggestible, $sort, $search, $target_name, $target_type, $range)
688 Get mappings, an internal data structure later used by
689 L<_process_mappings($mappings, $data, $record_document, $altscript)> to process MARC target
690 data for a MARC mapping.
692 The returned C<$mappings> is not to to be confused with mappings provided by
693 C<_foreach_mapping>, rather this sub accepts properties from a mapping as
694 provided by C<_foreach_mapping> and expands it to this internal data structure.
695 In the caller context (C<_get_marc_mapping_rules>) the returned C<@mappings>
696 is then applied to each MARC target (leader, control field data, subfield or
697 joined subfields) and integrated into the mapping rules data structure used in
698 C<marc_records_to_documents> to transform MARC records into Elasticsearch
705 Boolean indicating whether to create a facet field for this mapping.
707 =item C<$suggestible>
709 Boolean indicating whether to create a suggestion field for this mapping.
713 Boolean indicating whether to create a sort field for this mapping.
717 Boolean indicating whether to create a search field for this mapping.
719 =item C<$target_name>
721 Elasticsearch document target field name.
723 =item C<$target_type>
725 Elasticsearch document target field type.
729 An optional range as a string in the format "<START>-<END>" or "<START>",
730 where "<START>" and "<END>" are integers specifying a range that will be used
731 for extracting a substring from MARC data as Elasticsearch field target value.
733 The first character position is "0", and the range is inclusive,
734 so "0-2" means the first three characters of MARC data.
736 If only "<START>" is provided only one character at position "<START>" will
743 sub _field_mappings {
744 my ($_self, $facet, $suggestible, $sort, $search, $target_name, $target_type, $range) = @_;
745 my %mapping_defaults = ();
748 my $substr_args = undef;
749 if (defined $range) {
750 # TODO: use value_callback instead?
751 my ($start, $end) = map(int, split /-/, $range, 2);
752 $substr_args = [$start];
753 push @{$substr_args}, (defined $end ? $end - $start + 1 : 1);
755 my $default_options = {};
757 $default_options->{substr} = $substr_args;
760 # TODO: Should probably have per type value callback/hook
761 # but hard code for now
762 if ($target_type eq 'boolean') {
763 $default_options->{value_callbacks} //= [];
764 push @{$default_options->{value_callbacks}}, sub {
766 # Trim whitespace at both ends
767 $value =~ s/^\s+|\s+$//g;
768 return $value ? 'true' : 'false';
773 my $mapping = [$target_name, $default_options];
774 push @mappings, $mapping;
778 push @suffixes, 'facet' if $facet;
779 push @suffixes, 'suggestion' if $suggestible;
780 push @suffixes, 'sort' if !defined $sort || $sort;
782 foreach my $suffix (@suffixes) {
783 my $mapping = ["${target_name}__$suffix"];
784 # TODO: Hack, fix later in less hideous manner
785 if ($suffix eq 'suggestion') {
786 push @{$mapping}, {%{$default_options}, property => 'input'};
789 push @{$mapping}, $default_options;
791 push @mappings, $mapping;
796 =head2 _get_marc_mapping_rules
798 my $mapping_rules = $self->_get_marc_mapping_rules()
800 Generates rules from mappings stored in database for MARC records to Elasticsearch JSON document conversion.
802 Since field retrieval is slow in C<MARC::Records> (all fields are itereted through for
803 each call to C<MARC::Record>->field) we create an optimized structure of mapping
804 rules keyed by MARC field tags holding all the mapping rules for that particular tag.
806 We can then iterate through all MARC fields for each record and apply all relevant
807 rules once per fields instead of retreiving fields multiple times for each mapping rule
808 which is terribly slow.
812 # TODO: This structure can be used for processing multiple MARC::Records so is currently
813 # rebuilt for each batch. Since it is cacheable it could also be stored in an in
814 # memory cache which it is currently not. The performance gain of caching
815 # would probably be marginal, but to do this could be a further improvement.
817 sub _get_marc_mapping_rules {
819 my $marcflavour = lc C4::Context->preference('marcflavour');
820 my $field_spec_regexp = qr/^([0-9]{3})([()0-9a-zA-Z]+)?(?:_\/(\d+(?:-\d+)?))?$/;
821 my $leader_regexp = qr/^leader(?:_\/(\d+(?:-\d+)?))?$/;
824 'control_fields' => {},
831 $self->_foreach_mapping(sub {
832 my ($name, $type, $facet, $suggestible, $sort, $search, $marc_type, $marc_field) = @_;
833 return if $marc_type ne $marcflavour;
835 if ($type eq 'sum') {
836 push @{$rules->{sum}}, $name;
837 push @{$rules->{sum}}, $name."__sort" if $sort;
839 elsif ($type eq 'isbn') {
840 push @{$rules->{isbn}}, $name;
842 elsif ($type eq 'boolean') {
843 # boolean gets special handling, if value doesn't exist for a field,
845 $rules->{defaults}->{$name} = 'false';
848 if ($marc_field =~ $field_spec_regexp) {
853 # Parse and separate subfields form subfield groups
855 my $subfield_group = '';
858 foreach my $token (split //, $2) {
861 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
862 "Unmatched opening parenthesis for $marc_field"
869 elsif ($token eq ")") {
871 if ($subfield_group) {
872 push @subfield_groups, $subfield_group;
873 $subfield_group = '';
878 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
879 "Unmatched closing parenthesis for $marc_field"
883 elsif ($open_group) {
884 $subfield_group .= $token;
887 push @subfields, $token;
892 push @subfields, '*';
895 my $range = defined $3 ? $3 : undef;
896 my @mappings = $self->_field_mappings($facet, $suggestible, $sort, $search, $name, $type, $range);
897 if ($field_tag < 10) {
898 $rules->{control_fields}->{$field_tag} //= [];
899 push @{$rules->{control_fields}->{$field_tag}}, @mappings;
902 $rules->{data_fields}->{$field_tag} //= {};
903 foreach my $subfield (@subfields) {
904 $rules->{data_fields}->{$field_tag}->{subfields}->{$subfield} //= [];
905 push @{$rules->{data_fields}->{$field_tag}->{subfields}->{$subfield}}, @mappings;
907 foreach my $subfield_group (@subfield_groups) {
908 $rules->{data_fields}->{$field_tag}->{subfields_join}->{$subfield_group} //= [];
909 push @{$rules->{data_fields}->{$field_tag}->{subfields_join}->{$subfield_group}}, @mappings;
913 elsif ($marc_field =~ $leader_regexp) {
914 my $range = defined $1 ? $1 : undef;
915 my @mappings = $self->_field_mappings($facet, $suggestible, $sort, $search, $name, $type, $range);
916 push @{$rules->{leader}}, @mappings;
919 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
920 "Invalid MARC field expression: $marc_field"
927 =head2 _foreach_mapping
929 $self->_foreach_mapping(
931 my ( $name, $type, $facet, $suggestible, $sort, $marc_type,
934 return unless $marc_type eq 'marc21';
935 print "Data comes from: " . $marc_field . "\n";
939 This allows you to apply a function to each entry in the elasticsearch mappings
940 table, in order to build the mappings for whatever is needed.
942 In the provided function, the files are:
948 The field name for elasticsearch (corresponds to the 'mapping' column in the
953 The type for this value, e.g. 'string'.
957 True if this value should be facetised. This only really makes sense if the
958 field is understood by the facet processing code anyway.
962 True if this is a field that a) needs special sort handling, and b) if it
963 should be sorted on. False if a) but not b). Undef if not a). This allows,
964 for example, author to be sorted on but not everything marked with "author"
965 to be included in that sort.
969 A string that indicates the MARC type that this mapping is for, e.g. 'marc21',
970 'unimarc', 'normarc'.
974 A string that describes the MARC field that contains the data to extract.
975 These are of a form suited to Catmandu's MARC fixers.
981 sub _foreach_mapping {
982 my ( $self, $sub ) = @_;
984 # TODO use a caching framework here
985 my $search_fields = Koha::Database->schema->resultset('SearchField')->search(
987 'search_marc_map.index_name' => $self->index,
989 { join => { search_marc_to_fields => 'search_marc_map' },
991 'search_marc_to_fields.facet',
992 'search_marc_to_fields.suggestible',
993 'search_marc_to_fields.sort',
994 'search_marc_to_fields.search',
995 'search_marc_map.marc_type',
996 'search_marc_map.marc_field',
1009 while ( my $search_field = $search_fields->next ) {
1011 # Force lower case on indexed field names for case insensitive
1012 # field name searches
1013 lc($search_field->name),
1014 $search_field->type,
1015 $search_field->get_column('facet'),
1016 $search_field->get_column('suggestible'),
1017 $search_field->get_column('sort'),
1018 $search_field->get_column('search'),
1019 $search_field->get_column('marc_type'),
1020 $search_field->get_column('marc_field'),
1025 =head2 process_error
1027 die process_error($@);
1029 This parses an Elasticsearch error message and produces a human-readable
1030 result from it. This result is probably missing all the useful information
1031 that you might want in diagnosing an issue, so the warning is also logged.
1033 Note that currently the resulting message is not internationalised. This
1034 will happen eventually by some method or other.
1039 my ($self, $msg) = @_;
1041 warn $msg; # simple logging
1043 # This is super-primitive
1044 return "Unable to understand your search query, please rephrase and try again.\n" if $msg =~ /ParseException/;
1046 return "Unable to perform your search. Please try again.\n";
1049 =head2 _read_configuration
1051 my $conf = _read_configuration();
1053 Reads the I<configuration file> and returns a hash structure with the
1054 configuration information. It raises an exception if mandatory entries
1057 The hashref structure has the following form:
1060 'nodes' => ['127.0.0.1:9200', 'anotherserver:9200'],
1061 'index_name' => 'koha_instance',
1064 This is configured by the following in the C<config> block in koha-conf.xml:
1067 <server>127.0.0.1:9200</server>
1068 <server>anotherserver:9200</server>
1069 <index_name>koha_instance</index_name>
1074 sub _read_configuration {
1078 my $conf = C4::Context->config('elasticsearch');
1079 Koha::Exceptions::Config::MissingEntry->throw(
1080 "Missing 'elasticsearch' block in config file")
1081 unless defined $conf;
1083 if ( $conf && $conf->{server} ) {
1084 my $nodes = $conf->{server};
1085 if ( ref($nodes) eq 'ARRAY' ) {
1086 $configuration->{nodes} = $nodes;
1089 $configuration->{nodes} = [$nodes];
1093 Koha::Exceptions::Config::MissingEntry->throw(
1094 "Missing 'server' entry in config file for elasticsearch");
1097 if ( defined $conf->{index_name} ) {
1098 $configuration->{index_name} = $conf->{index_name};
1101 Koha::Exceptions::Config::MissingEntry->throw(
1102 "Missing 'index_name' entry in config file for elasticsearch");
1105 return $configuration;
1108 =head2 get_facetable_fields
1110 my @facetable_fields = Koha::SearchEngine::Elasticsearch->get_facetable_fields();
1112 Returns the list of Koha::SearchFields marked to be faceted in the ES configuration
1116 sub get_facetable_fields {
1119 # These should correspond to the ES field names, as opposed to the CCL
1120 # things that zebra uses.
1121 my @search_field_names = qw( author itype location su-geo title-series subject ccode holdingbranch homebranch ln );
1122 my @faceted_fields = Koha::SearchFields->search(
1123 { name => { -in => \@search_field_names }, facet_order => { '!=' => undef } }, { order_by => ['facet_order'] }
1125 my @not_faceted_fields = Koha::SearchFields->search(
1126 { name => { -in => \@search_field_names }, facet_order => undef }, { order_by => ['facet_order'] }
1128 # This could certainly be improved
1129 return ( @faceted_fields, @not_faceted_fields );
1140 =item Chris Cormack C<< <chrisc@catalyst.net.nz> >>
1142 =item Robin Sheat C<< <robin@catalyst.net.nz> >>
1144 =item Jonathan Druart C<< <jonathan.druart@bugs.koha-community.org> >>