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::SearchFields;
27 use Koha::SearchMarcMaps;
34 use Search::Elasticsearch;
38 use List::Util qw( sum0 reduce );
41 use Encode qw(encode);
44 __PACKAGE__->mk_ro_accessors(qw( index ));
45 __PACKAGE__->mk_accessors(qw( sort_fields ));
47 # Constants to refer to the standard index names
48 Readonly our $BIBLIOS_INDEX => 'biblios';
49 Readonly our $AUTHORITIES_INDEX => 'authorities';
53 Koha::SearchEngine::Elasticsearch - Base module for things using elasticsearch
61 The name of the index to use, generally 'biblios' or 'authorities'.
71 my $self = $class->SUPER::new(@_);
72 # Check for a valid index
73 Koha::Exceptions::MissingParameter->throw('No index name provided') unless $self->index;
77 =head2 get_elasticsearch
79 my $elasticsearch_client = $self->get_elasticsearch();
81 Returns a C<Search::Elasticsearch> client. The client is cached on a C<Koha::SearchEngine::ElasticSearch>
82 instance level and will be reused if method is called multiple times.
86 sub get_elasticsearch {
88 unless (defined $self->{elasticsearch}) {
89 my $conf = $self->get_elasticsearch_params();
90 $self->{elasticsearch} = Search::Elasticsearch->new($conf);
92 return $self->{elasticsearch};
95 =head2 get_elasticsearch_params
97 my $params = $self->get_elasticsearch_params();
99 This provides a hashref that contains the parameters for connecting to the
100 ElasicSearch servers, in the form:
103 'nodes' => ['127.0.0.1:9200', 'anotherserver:9200'],
104 'index_name' => 'koha_instance_index',
107 This is configured by the following in the C<config> block in koha-conf.xml:
110 <server>127.0.0.1:9200</server>
111 <server>anotherserver:9200</server>
112 <index_name>koha_instance</index_name>
117 sub get_elasticsearch_params {
120 # Copy the hash so that we're not modifying the original
121 my $conf = C4::Context->config('elasticsearch');
122 die "No 'elasticsearch' block is defined in koha-conf.xml.\n" if ( !$conf );
123 my $es = { %{ $conf } };
125 # Helpfully, the multiple server lines end up in an array for us anyway
126 # if there are multiple ones, but not if there's only one.
127 my $server = $es->{server};
128 delete $es->{server};
129 if ( ref($server) eq 'ARRAY' ) {
131 # store it called 'nodes' (which is used by newer Search::Elasticsearch)
132 $es->{nodes} = $server;
135 $es->{nodes} = [$server];
138 die "No elasticsearch servers were specified in koha-conf.xml.\n";
140 die "No elasticsearch index_name was specified in koha-conf.xml.\n"
141 if ( !$es->{index_name} );
142 # Append the name of this particular index to our namespace
143 $es->{index_name} .= '_' . $self->index;
145 $es->{key_prefix} = 'es_';
146 $es->{client} //= '5_0::Direct';
147 $es->{cxn_pool} //= 'Static';
148 $es->{request_timeout} //= 60;
153 =head2 get_elasticsearch_settings
155 my $settings = $self->get_elasticsearch_settings();
157 This provides the settings provided to Elasticsearch when an index is created.
158 These can do things like define tokenization methods.
160 A hashref containing the settings is returned.
164 sub get_elasticsearch_settings {
167 # Use state to speed up repeated calls
168 state $settings = undef;
169 if (!defined $settings) {
170 my $config_file = C4::Context->config('elasticsearch_index_config');
171 $config_file ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/index_config.yaml';
172 $settings = LoadFile( $config_file );
178 =head2 get_elasticsearch_mappings
180 my $mappings = $self->get_elasticsearch_mappings();
182 This provides the mappings that get passed to Elasticsearch when an index is
187 sub get_elasticsearch_mappings {
190 # Use state to speed up repeated calls
194 if (!defined $all_mappings{$self->index}) {
195 $sort_fields{$self->index} = {};
196 # Clone the general mapping to break ties with the original hash
198 data => clone(_get_elasticsearch_field_config('general', ''))
200 my $marcflavour = lc C4::Context->preference('marcflavour');
201 $self->_foreach_mapping(
203 my ( $name, $type, $facet, $suggestible, $sort, $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') {
220 $mappings->{data}{properties}{$name} = _get_elasticsearch_field_config('search', $es_type);
223 $mappings->{data}{properties}{ $name . '__facet' } = _get_elasticsearch_field_config('facet', $es_type);
226 $mappings->{data}{properties}{ $name . '__suggestion' } = _get_elasticsearch_field_config('suggestible', $es_type);
228 # Sort is a bit special as it can be true, false, undef.
229 # We care about "true" or "undef",
230 # "undef" means to do the default thing, which is make it sortable.
231 if (!defined $sort || $sort) {
232 $mappings->{data}{properties}{ $name . '__sort' } = _get_elasticsearch_field_config('sort', $es_type);
233 $sort_fields{$self->index}{$name} = 1;
237 $all_mappings{$self->index} = $mappings;
239 $self->sort_fields(\%{$sort_fields{$self->index}});
241 return $all_mappings{$self->index};
244 =head2 _get_elasticsearch_field_config
246 Get the Elasticsearch field config for the given purpose and data type.
248 $mapping = _get_elasticsearch_field_config('search', 'text');
252 sub _get_elasticsearch_field_config {
254 my ( $purpose, $type ) = @_;
256 # Use state to speed up repeated calls
257 state $settings = undef;
258 if (!defined $settings) {
259 my $config_file = C4::Context->config('elasticsearch_field_config');
260 $config_file ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/field_config.yaml';
261 $settings = LoadFile( $config_file );
264 if (!defined $settings->{$purpose}) {
265 die "Field purpose $purpose not defined in field config";
268 return $settings->{$purpose};
270 if (defined $settings->{$purpose}{$type}) {
271 return $settings->{$purpose}{$type};
273 if (defined $settings->{$purpose}{'default'}) {
274 return $settings->{$purpose}{'default'};
279 sub reset_elasticsearch_mappings {
280 my ( $reset_fields ) = @_;
281 my $mappings_yaml = C4::Context->config('elasticsearch_index_mappings');
282 $mappings_yaml ||= C4::Context->config('intranetdir') . '/admin/searchengine/elasticsearch/mappings.yaml';
283 my $indexes = LoadFile( $mappings_yaml );
285 while ( my ( $index_name, $fields ) = each %$indexes ) {
286 while ( my ( $field_name, $data ) = each %$fields ) {
287 my %sf_params = map { $_ => $data->{$_} } grep { exists $data->{$_} } qw/ type label weight facet_order /;
288 $sf_params{name} = $field_name;
290 my $search_field = Koha::SearchFields->find_or_create( \%sf_params, { key => 'name' } );
292 my $mappings = $data->{mappings};
293 for my $mapping ( @$mappings ) {
294 my $marc_field = Koha::SearchMarcMaps->find_or_create({ index_name => $index_name, marc_type => $mapping->{marc_type}, marc_field => $mapping->{marc_field} });
295 $search_field->add_to_search_marc_maps($marc_field, { facet => $mapping->{facet} || 0, suggestible => $mapping->{suggestible} || 0, sort => $mapping->{sort} } );
301 # This overrides the accessor provided by Class::Accessor so that if
302 # sort_fields isn't set, then it'll generate it.
306 $self->_sort_fields_accessor(@_);
309 my $val = $self->_sort_fields_accessor();
312 # This will populate the accessor as a side effect
313 $self->get_elasticsearch_mappings();
314 return $self->_sort_fields_accessor();
317 =head2 _process_mappings($mappings, $data, $record_document, $altscript)
319 $self->_process_mappings($mappings, $marc_field_data, $record_document, 0)
321 Process all C<$mappings> targets operating on a specific MARC field C<$data>.
322 Since we group all mappings by MARC field targets C<$mappings> will contain
323 all targets for C<$data> and thus we need to fetch the MARC field only once.
324 C<$mappings> will be applied to C<$record_document> and new field values added.
325 The method has no return value.
331 Arrayref of mappings containing arrayrefs in the format
332 [C<$target>, C<$options>] where C<$target> is the name of the target field and
333 C<$options> is a hashref containing processing directives for this particular
338 The source data from a MARC record field.
340 =item C<$record_document>
342 Hashref representing the Elasticsearch document on which mappings should be
347 A boolean value indicating whether an alternate script presentation is being
354 sub _process_mappings {
355 my ($_self, $mappings, $data, $record_document, $altscript) = @_;
356 foreach my $mapping (@{$mappings}) {
357 my ($target, $options) = @{$mapping};
359 # Don't process sort fields for alternate scripts
360 my $sort = $target =~ /__sort$/;
361 if ($sort && $altscript) {
365 # Copy (scalar) data since can have multiple targets
366 # with differing options for (possibly) mutating data
367 # so need a different copy for each
369 $record_document->{$target} //= [];
370 if (defined $options->{substr}) {
371 my ($start, $length) = @{$options->{substr}};
372 $_data = length($data) > $start ? substr $data, $start, $length : '';
374 if (defined $options->{value_callbacks}) {
375 $_data = reduce { $b->($a) } ($_data, @{$options->{value_callbacks}});
377 if (defined $options->{property}) {
379 $options->{property} => $_data
382 push @{$record_document->{$target}}, $_data;
386 =head2 marc_records_to_documents($marc_records)
388 my @record_documents = $self->marc_records_to_documents($marc_records);
390 Using mappings stored in database convert C<$marc_records> to Elasticsearch documents.
392 Returns array of hash references, representing Elasticsearch documents,
393 acceptable as body payload in C<Search::Elasticsearch> requests.
397 =item C<$marc_documents>
399 Reference to array of C<MARC::Record> objects to be converted to Elasticsearch documents.
405 sub marc_records_to_documents {
406 my ($self, $records) = @_;
407 my $rules = $self->_get_marc_mapping_rules();
408 my $control_fields_rules = $rules->{control_fields};
409 my $data_fields_rules = $rules->{data_fields};
410 my $marcflavour = lc C4::Context->preference('marcflavour');
412 my @record_documents;
414 foreach my $record (@{$records}) {
415 my $record_document = {};
416 my $mappings = $rules->{leader};
418 $self->_process_mappings($mappings, $record->leader(), $record_document, 0);
420 foreach my $field ($record->fields()) {
421 if ($field->is_control_field()) {
422 my $mappings = $control_fields_rules->{$field->tag()};
424 $self->_process_mappings($mappings, $field->data(), $record_document, 0);
428 my $tag = $field->tag();
429 # Handle alternate scripts in MARC 21
431 if ($marcflavour eq 'marc21' && $tag eq '880') {
432 my $sub6 = $field->subfield('6');
433 if ($sub6 =~ /^(...)-\d+/) {
439 my $data_field_rules = $data_fields_rules->{$tag};
441 if ($data_field_rules) {
442 my $subfields_mappings = $data_field_rules->{subfields};
443 my $wildcard_mappings = $subfields_mappings->{'*'};
444 foreach my $subfield ($field->subfields()) {
445 my ($code, $data) = @{$subfield};
446 my $mappings = $subfields_mappings->{$code} // [];
447 if ($wildcard_mappings) {
448 $mappings = [@{$mappings}, @{$wildcard_mappings}];
451 $self->_process_mappings($mappings, $data, $record_document, $altscript);
455 my $subfields_join_mappings = $data_field_rules->{subfields_join};
456 if ($subfields_join_mappings) {
457 foreach my $subfields_group (keys %{$subfields_join_mappings}) {
458 # Map each subfield to values, remove empty values, join with space
463 map { join(' ', $field->subfield($_)) } split(//, $subfields_group)
467 $self->_process_mappings($subfields_join_mappings->{$subfields_group}, $data, $record_document, $altscript);
474 foreach my $field (keys %{$rules->{defaults}}) {
475 unless (defined $record_document->{$field}) {
476 $record_document->{$field} = $rules->{defaults}->{$field};
479 foreach my $field (@{$rules->{sum}}) {
480 if (defined $record_document->{$field}) {
481 # TODO: validate numeric? filter?
482 # TODO: Or should only accept fields without nested values?
483 # TODO: Quick and dirty, improve if needed
484 $record_document->{$field} = sum0(grep { !ref($_) && m/\d+(\.\d+)?/} @{$record_document->{$field}});
487 # Index all applicable ISBN forms (ISBN-10 and ISBN-13 with and without dashes)
488 foreach my $field (@{$rules->{isbn}}) {
489 if (defined $record_document->{$field}) {
491 foreach my $input_isbn (@{$record_document->{$field}}) {
492 my $isbn = Business::ISBN->new($input_isbn);
493 if (defined $isbn && $isbn->is_valid) {
494 my $isbn13 = $isbn->as_isbn13->as_string;
495 push @isbns, $isbn13;
497 push @isbns, $isbn13;
499 my $isbn10 = $isbn->as_isbn10;
501 $isbn10 = $isbn10->as_string;
502 push @isbns, $isbn10;
504 push @isbns, $isbn10;
507 push @isbns, $input_isbn;
510 $record_document->{$field} = \@isbns;
514 # Remove duplicate values and collapse sort fields
515 foreach my $field (keys %{$record_document}) {
516 if (ref($record_document->{$field}) eq 'ARRAY') {
517 @{$record_document->{$field}} = do {
519 grep { !$seen{ref($_) eq 'HASH' && defined $_->{input} ? $_->{input} : $_}++ } @{$record_document->{$field}};
521 if ($field =~ /__sort$/) {
522 # Make sure to keep the sort field length sensible. 255 was chosen as a nice round value.
523 $record_document->{$field} = [substr(join(' ', @{$record_document->{$field}}), 0, 255)];
528 # TODO: Perhaps should check if $records_document non empty, but really should never be the case
529 $record->encoding('UTF-8');
532 # Temporarily intercept all warn signals (MARC::Record carps when record length > 99999)
533 local $SIG{__WARN__} = sub {
534 push @warnings, $_[0];
536 $record_document->{'marc_data'} = encode_base64(encode('UTF-8', $record->as_usmarc()));
539 # Suppress warnings if record length exceeded
540 unless (substr($record->leader(), 0, 5) eq '99999') {
541 foreach my $warning (@warnings) {
545 $record_document->{'marc_data'} = $record->as_xml_record($marcflavour);
546 $record_document->{'marc_format'} = 'MARCXML';
549 $record_document->{'marc_format'} = 'base64ISO2709';
551 my $id = $record->subfield('999', 'c');
552 push @record_documents, [$id, $record_document];
554 return \@record_documents;
557 =head2 _field_mappings($facet, $suggestible, $sort, $target_name, $target_type, $range)
559 my @mappings = _field_mappings($facet, $suggestible, $sort, $target_name, $target_type, $range)
561 Get mappings, an internal data structure later used by
562 L<_process_mappings($mappings, $data, $record_document, $altscript)> to process MARC target
563 data for a MARC mapping.
565 The returned C<$mappings> is not to to be confused with mappings provided by
566 C<_foreach_mapping>, rather this sub accepts properties from a mapping as
567 provided by C<_foreach_mapping> and expands it to this internal data structure.
568 In the caller context (C<_get_marc_mapping_rules>) the returned C<@mappings>
569 is then applied to each MARC target (leader, control field data, subfield or
570 joined subfields) and integrated into the mapping rules data structure used in
571 C<marc_records_to_documents> to transform MARC records into Elasticsearch
578 Boolean indicating whether to create a facet field for this mapping.
580 =item C<$suggestible>
582 Boolean indicating whether to create a suggestion field for this mapping.
586 Boolean indicating whether to create a sort field for this mapping.
588 =item C<$target_name>
590 Elasticsearch document target field name.
592 =item C<$target_type>
594 Elasticsearch document target field type.
598 An optional range as a string in the format "<START>-<END>" or "<START>",
599 where "<START>" and "<END>" are integers specifying a range that will be used
600 for extracting a substring from MARC data as Elasticsearch field target value.
602 The first character position is "0", and the range is inclusive,
603 so "0-2" means the first three characters of MARC data.
605 If only "<START>" is provided only one character at position "<START>" will
612 sub _field_mappings {
613 my ($_self, $facet, $suggestible, $sort, $target_name, $target_type, $range) = @_;
614 my %mapping_defaults = ();
617 my $substr_args = undef;
618 if (defined $range) {
619 # TODO: use value_callback instead?
620 my ($start, $end) = map(int, split /-/, $range, 2);
621 $substr_args = [$start];
622 push @{$substr_args}, (defined $end ? $end - $start + 1 : 1);
624 my $default_options = {};
626 $default_options->{substr} = $substr_args;
629 # TODO: Should probably have per type value callback/hook
630 # but hard code for now
631 if ($target_type eq 'boolean') {
632 $default_options->{value_callbacks} //= [];
633 push @{$default_options->{value_callbacks}}, sub {
635 # Trim whitespace at both ends
636 $value =~ s/^\s+|\s+$//g;
637 return $value ? 'true' : 'false';
641 my $mapping = [$target_name, $default_options];
642 push @mappings, $mapping;
645 push @suffixes, 'facet' if $facet;
646 push @suffixes, 'suggestion' if $suggestible;
647 push @suffixes, 'sort' if !defined $sort || $sort;
649 foreach my $suffix (@suffixes) {
650 my $mapping = ["${target_name}__$suffix"];
651 # TODO: Hack, fix later in less hideous manner
652 if ($suffix eq 'suggestion') {
653 push @{$mapping}, {%{$default_options}, property => 'input'};
656 push @{$mapping}, $default_options;
658 push @mappings, $mapping;
663 =head2 _get_marc_mapping_rules
665 my $mapping_rules = $self->_get_marc_mapping_rules()
667 Generates rules from mappings stored in database for MARC records to Elasticsearch JSON document conversion.
669 Since field retrieval is slow in C<MARC::Records> (all fields are itereted through for
670 each call to C<MARC::Record>->field) we create an optimized structure of mapping
671 rules keyed by MARC field tags holding all the mapping rules for that particular tag.
673 We can then iterate through all MARC fields for each record and apply all relevant
674 rules once per fields instead of retreiving fields multiple times for each mapping rule
675 which is terribly slow.
679 # TODO: This structure can be used for processing multiple MARC::Records so is currently
680 # rebuilt for each batch. Since it is cacheable it could also be stored in an in
681 # memory cache which it is currently not. The performance gain of caching
682 # would probably be marginal, but to do this could be a further improvement.
684 sub _get_marc_mapping_rules {
686 my $marcflavour = lc C4::Context->preference('marcflavour');
687 my $field_spec_regexp = qr/^([0-9]{3})([()0-9a-z]+)?(?:_\/(\d+(?:-\d+)?))?$/;
688 my $leader_regexp = qr/^leader(?:_\/(\d+(?:-\d+)?))?$/;
691 'control_fields' => {},
698 $self->_foreach_mapping(sub {
699 my ($name, $type, $facet, $suggestible, $sort, $marc_type, $marc_field) = @_;
700 return if $marc_type ne $marcflavour;
702 if ($type eq 'sum') {
703 push @{$rules->{sum}}, $name;
705 elsif ($type eq 'isbn') {
706 push @{$rules->{isbn}}, $name;
708 elsif ($type eq 'boolean') {
709 # boolean gets special handling, if value doesn't exist for a field,
711 $rules->{defaults}->{$name} = 'false';
714 if ($marc_field =~ $field_spec_regexp) {
719 # Parse and separate subfields form subfield groups
721 my $subfield_group = '';
724 foreach my $token (split //, $2) {
727 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
728 "Unmatched opening parenthesis for $marc_field"
735 elsif ($token eq ")") {
737 if ($subfield_group) {
738 push @subfield_groups, $subfield_group;
739 $subfield_group = '';
744 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
745 "Unmatched closing parenthesis for $marc_field"
749 elsif ($open_group) {
750 $subfield_group .= $token;
753 push @subfields, $token;
758 push @subfields, '*';
761 my $range = defined $3 ? $3 : undef;
762 my @mappings = $self->_field_mappings($facet, $suggestible, $sort, $name, $type, $range);
764 if ($field_tag < 10) {
765 $rules->{control_fields}->{$field_tag} //= [];
766 push @{$rules->{control_fields}->{$field_tag}}, @mappings;
769 $rules->{data_fields}->{$field_tag} //= {};
770 foreach my $subfield (@subfields) {
771 $rules->{data_fields}->{$field_tag}->{subfields}->{$subfield} //= [];
772 push @{$rules->{data_fields}->{$field_tag}->{subfields}->{$subfield}}, @mappings;
774 foreach my $subfield_group (@subfield_groups) {
775 $rules->{data_fields}->{$field_tag}->{subfields_join}->{$subfield_group} //= [];
776 push @{$rules->{data_fields}->{$field_tag}->{subfields_join}->{$subfield_group}}, @mappings;
780 elsif ($marc_field =~ $leader_regexp) {
781 my $range = defined $1 ? $1 : undef;
782 my @mappings = $self->_field_mappings($facet, $suggestible, $sort, $name, $type, $range);
783 push @{$rules->{leader}}, @mappings;
786 Koha::Exceptions::Elasticsearch::MARCFieldExprParseError->throw(
787 "Invalid MARC field expression: $marc_field"
794 =head2 _foreach_mapping
796 $self->_foreach_mapping(
798 my ( $name, $type, $facet, $suggestible, $sort, $marc_type,
801 return unless $marc_type eq 'marc21';
802 print "Data comes from: " . $marc_field . "\n";
806 This allows you to apply a function to each entry in the elasticsearch mappings
807 table, in order to build the mappings for whatever is needed.
809 In the provided function, the files are:
815 The field name for elasticsearch (corresponds to the 'mapping' column in the
820 The type for this value, e.g. 'string'.
824 True if this value should be facetised. This only really makes sense if the
825 field is understood by the facet processing code anyway.
829 True if this is a field that a) needs special sort handling, and b) if it
830 should be sorted on. False if a) but not b). Undef if not a). This allows,
831 for example, author to be sorted on but not everything marked with "author"
832 to be included in that sort.
836 A string that indicates the MARC type that this mapping is for, e.g. 'marc21',
837 'unimarc', 'normarc'.
841 A string that describes the MARC field that contains the data to extract.
842 These are of a form suited to Catmandu's MARC fixers.
848 sub _foreach_mapping {
849 my ( $self, $sub ) = @_;
851 # TODO use a caching framework here
852 my $search_fields = Koha::Database->schema->resultset('SearchField')->search(
854 'search_marc_map.index_name' => $self->index,
856 { join => { search_marc_to_fields => 'search_marc_map' },
858 'search_marc_to_fields.facet',
859 'search_marc_to_fields.suggestible',
860 'search_marc_to_fields.sort',
861 'search_marc_map.marc_type',
862 'search_marc_map.marc_field',
874 while ( my $search_field = $search_fields->next ) {
876 # Force lower case on indexed field names for case insensitive
877 # field name searches
878 lc($search_field->name),
880 $search_field->get_column('facet'),
881 $search_field->get_column('suggestible'),
882 $search_field->get_column('sort'),
883 $search_field->get_column('marc_type'),
884 $search_field->get_column('marc_field'),
891 die process_error($@);
893 This parses an Elasticsearch error message and produces a human-readable
894 result from it. This result is probably missing all the useful information
895 that you might want in diagnosing an issue, so the warning is also logged.
897 Note that currently the resulting message is not internationalised. This
898 will happen eventually by some method or other.
903 my ($self, $msg) = @_;
905 warn $msg; # simple logging
907 # This is super-primitive
908 return "Unable to understand your search query, please rephrase and try again.\n" if $msg =~ /ParseException/;
910 return "Unable to perform your search. Please try again.\n";
913 =head2 _read_configuration
915 my $conf = _read_configuration();
917 Reads the I<configuration file> and returns a hash structure with the
918 configuration information. It raises an exception if mandatory entries
921 The hashref structure has the following form:
924 'nodes' => ['127.0.0.1:9200', 'anotherserver:9200'],
925 'index_name' => 'koha_instance',
928 This is configured by the following in the C<config> block in koha-conf.xml:
931 <server>127.0.0.1:9200</server>
932 <server>anotherserver:9200</server>
933 <index_name>koha_instance</index_name>
938 sub _read_configuration {
942 my $conf = C4::Context->config('elasticsearch');
943 Koha::Exceptions::Config::MissingEntry->throw(
944 "Missing 'elasticsearch' block in config file")
945 unless defined $conf;
947 if ( $conf && $conf->{server} ) {
948 my $nodes = $conf->{server};
949 if ( ref($nodes) eq 'ARRAY' ) {
950 $configuration->{nodes} = $nodes;
953 $configuration->{nodes} = [$nodes];
957 Koha::Exceptions::Config::MissingEntry->throw(
958 "Missing 'server' entry in config file for elasticsearch");
961 if ( defined $conf->{index_name} ) {
962 $configuration->{index_name} = $conf->{index_name};
965 Koha::Exceptions::Config::MissingEntry->throw(
966 "Missing 'index_name' entry in config file for elasticsearch");
969 return $configuration;
972 =head2 get_facetable_fields
974 my @facetable_fields = Koha::SearchEngine::Elasticsearch->get_facetable_fields();
976 Returns the list of Koha::SearchFields marked to be faceted in the ES configuration
980 sub get_facetable_fields {
983 # These should correspond to the ES field names, as opposed to the CCL
984 # things that zebra uses.
985 my @search_field_names = qw( author itype location su-geo title-series subject ccode holdingbranch homebranch ln );
986 my @faceted_fields = Koha::SearchFields->search(
987 { name => { -in => \@search_field_names }, facet_order => { '!=' => undef } }, { order_by => ['facet_order'] }
989 my @not_faceted_fields = Koha::SearchFields->search(
990 { name => { -in => \@search_field_names }, facet_order => undef }, { order_by => ['facet_order'] }
992 # This could certainly be improved
993 return ( @faceted_fields, @not_faceted_fields );
1004 =item Chris Cormack C<< <chrisc@catalyst.net.nz> >>
1006 =item Robin Sheat C<< <robin@catalyst.net.nz> >>
1008 =item Jonathan Druart C<< <jonathan.druart@bugs.koha-community.org> >>