Class: BentoSearch::SummonEngine
- Inherits:
-
Object
- Object
- BentoSearch::SummonEngine
- Extended by:
- HTTPClientPatch::IncludeClient
- Includes:
- ActionView::Helpers::OutputSafetyHelper, SearchEngine
- Defined in:
- app/search_engines/bento_search/summon_engine.rb
Overview
Functionality notes
-
for pagination, underlying summon API only supports ‘page’, not ‘start’ style, if you pass in ‘start’ style it will be ‘rounded’ to containing ‘page’.
Required config params
- access_id
-
supplied by SerSol for your account
- secret_key
-
supplied by SerSol for your account
Optional custom config params
- fixed_params
-
Fixed SerSol query param literals to send with every search. Value is a HASH, of keys and either single values or arrays of values. For instance, to exclude certain content types from all search results, in config:
:fixed_params => {"s.fvf" => ["ContentType,Web Resource,true","ContentType,Reference,true","ContentType,eBook,true"] }
Note that values are NOT URI escaped in config, code will take care of that for you. You could also fix “s.role” to ‘authenticated’ using this mechanism, if you restrict all access to your app to authenticated affiliated users.
- highlighting
-
Default true, ask SerSol for query-in-context highlighting in title and snippets field. If true you WILL get HTML with <b> tags in your titles – and snippets available in ResultItems. They will be used by stnadard display logic as summary unless you set for_display.prefer_abstract_as_summary = true
- use_summon_openurl
-
default false. If true, will use OpenURL kev context
object passed back by summon to generate openurls, instead of creating
one ourself from individual data elements. summon openurl is decent,
but currently includes highlighting tags in title elements. Also note
it includes DC-type openurls, which we don't currently generate ourselves.
- lang
-
Sent to summon as “s.l” param, see api.summon.serialssolutions.com/help/api/search/parameters/language default nil. You may want to set to “en”.
Custom search params
- :auth
-
Pass in ‘:auth => true` (or “true”) to send headers to summon
indicating an authorized user, for full search results.
- :summon_params
-
Hash of key/value pairs to pass directly to summon. Just like
fixed_params in configuration, but per-search. Can be
used to directly trigger functionality not covered by
the bento_search adapter. Values can be arrays where summon
keys are repeatable.
- :peer_reviewed_only
-
Set to boolean true or string ‘true’, to restrict results to peer-reviewed only (as identified by Summon)
- :online_only
-
Limit to only items marked ‘with fulltext online’ by Summon. Just a convenience shortcut for setting s.fvf including IsFullText,true
- :pubyear_start
- :pubyear_end
-
Date range limiting, pass in custom search args, one or both of pubyear_start and pubyear_end #to_i will be called on it, so can be string. .search(:query => “foo”, :pubyear_start => 2000)
Custom response data
-
result_item.custom_data has a Hash of the decoded JSON for the item, directly as returned by Summon API.
Tech notes
We did not choose to use the summon ruby gem in general, we wanted more control than it offered (ability to use HTTPClient persistent connections, MultiJson for json parsing, etc).
However, we DO use that gem specifically for constructing authentication headers how summon wants it, see class at github.com/summon/summon.rb/blob/master/lib/summon/transport/headers.rb
Language provided only in language_str not language_code, all that API gives us. We could try to reverse lookup from ISO code labels later if we want.
Constant Summary collapse
- HttpTimeout =
Can’t change http timeout in config, because we keep an http client at class-wide level, and config is not class-wide. Change this ‘constant’ if you want to change it, I guess.
Summon is pretty fast, we think a 4.5 second timeout should be be plenty. May be adjusted from experience.
4.5
- @@hl_start_token =
Originally we used $$BENTO_HL_START$$ etc with dollar signs, but the dollar signs trigger a weird bug in summon where end tokens are missing from output.
"__BENTO_HL_START__"
- @@hl_end_token =
"__BENTO_HL_END__"
Constants included from SearchEngine
BentoSearch::SearchEngine::DefaultPerPage
Class Method Summary collapse
Instance Method Summary collapse
-
#construct_request(args) ⇒ Object
returns two element array: [uri, headers].
- #first_if_present(array) ⇒ Object
-
#format_title(doc_hash) ⇒ Object
combine title and subtitle into one title,.
-
#get(id) ⇒ Object
Looks up a record by SerSol Id, engine.get( item.unique_id ) should return item.
-
#handle_highlighting(str, options = {}) ⇒ Object
If summon has put snippet highlighting tokens in a field, we need to HTML escape the literal values, while still using the highlighting tokens to put HTML tags around highlighted terms.
- #max_per_page ⇒ Object
- #name_normalize(str) ⇒ Object
-
#normalize_content_type(summon_type) ⇒ Object
Normalize Summon Content-Type to our standardized list.
-
#search_field_definitions ⇒ Object
Summon offers many more search fields than this.
- #search_implementation(args) ⇒ Object
-
#sort_definitions ⇒ Object
Summon actually only supports relevancy sort, and pub year asc or desc.
-
#summon_escape(string) ⇒ Object
Escapes special chars for Summon.
Methods included from HTTPClientPatch::IncludeClient
Methods included from SearchEngine
#display_configuration, #engine_id, #fill_in_search_metadata_for, #initialize, #normalized_search_arguments, #public_settable_search_args, #search
Methods included from BentoSearch::SearchEngine::Capabilities
#multi_field_search?, #search_keys, #semantic_search_keys, #semantic_search_map, #sort_keys
Class Method Details
.default_configuration ⇒ Object
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# File 'app/search_engines/bento_search/summon_engine.rb', line 431 def self.default_configuration { :base_url => "http://api.summon.serialssolutions.com/2.0.0/search", :highlighting => true, :use_summon_openurl => false } end |
.required_configuration ⇒ Object
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# File 'app/search_engines/bento_search/summon_engine.rb', line 427 def self.required_configuration [:access_id, :secret_key] end |
Instance Method Details
#construct_request(args) ⇒ Object
returns two element array: [uri, headers]
uri, headers = construct_request(args)
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# File 'app/search_engines/bento_search/summon_engine.rb', line 285 def construct_request(args) # Query params in a hash with array values, becuase easiest # to generate auth headers that way. Value is array of values that # are NOT URI-encoded yet. query_params = Hash.new {|h, k| h[k] = [] } # Add in fixed_params from config, and summon_params from search, if any. direct_params = (configuration.fixed_params || {}).merge( args[:summon_params] || {} ) direct_params.each_pair do |key, value| [value].flatten.each do |v| query_params[key] << v end end if args[:per_page] query_params["s.ps"] = args[:per_page] end if args[:page] query_params["s.pn"] = args[:page] end if args[:search_field] query_params['s.q'] = "#{args[:search_field]}:(#{summon_escape(args[:query])})" else query_params['s.q'] = summon_escape( args[:query] ) end if (args[:sort] && (defn = self.sort_definitions[args[:sort]]) && (literal = defn[:implementation])) query_params['s.sort'] = literal end if args[:auth] == true query_params['s.role'] = "authenticated" end if [true, "true"].include? args[:peer_reviewed_only] query_params['s.fvf'] ||= [] query_params['s.fvf'] << "IsPeerReviewed,true" end if [true, "true"].include? args[:online_only] query_params["s.fvf"] ||= [] query_params['s.fvf'] << "IsFullText,true" end # Summon uses "*" for open ended range endpoint if args[:pubyear_start] || args[:pubyear_end] from = args[:pubyear_start].to_i from = "*" if from == 0 to = args[:pubyear_end].to_i to = "*" if to == 0 query_params["s.rf"] ||= [] query_params["s.rf"] << "PublicationDate,#{from}:#{to}" end if configuration.highlighting query_params['s.hs'] = @@hl_start_token query_params['s.he'] = @@hl_end_token else query_params['s.hl'] = "false" end if configuration.lang query_params["s.l"] = configuration.lang end headers = Summon::Transport::Headers.new( :access_id => configuration.access_id, :secret_key => configuration.secret_key, :accept => "json", :params => query_params, :url => configuration.base_url ) query_string = query_params.keys.collect do |key| [query_params[key]].flatten.collect do |value| "#{CGI.escape(key.to_s)}=#{CGI.escape(value.to_s)}" end end.flatten.join("&") uri = "#{configuration.base_url}?#{query_string}" return [uri, headers] end |
#first_if_present(array) ⇒ Object
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# File 'app/search_engines/bento_search/summon_engine.rb', line 243 def first_if_present(array) array ? array.first : nil end |
#format_title(doc_hash) ⇒ Object
combine title and subtitle into one title,
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# File 'app/search_engines/bento_search/summon_engine.rb', line 416 def format_title(doc_hash) title = first_if_present doc_hash["Title"] subtitle = first_if_present doc_hash["Subtitle"] if subtitle.present? title = "#{title}: #{subtitle}" end return handle_highlighting( title ) end |
#get(id) ⇒ Object
Looks up a record by SerSol Id, engine.get( item.unique_id ) should return item.
Returns a single BentoSearch::ResultItem, or raises BentoSearch::NotFound, BentoSearch::TooManyFound, or other unspecified exception.
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# File 'app/search_engines/bento_search/summon_engine.rb', line 231 def get(id) # "ID" is an internal search field for Summon, not listed in our # own search_field_definitions, but it works. results = search(id, :search_field => "ID") raise BentoSearch::NotFound.new("ID: #{id}") if results.length == 0 raise BentoSearch::TooManyFound.new("ID: #{id}") if results.length == 0 raise (results.error[:exception] || Exception.new(error.inspect)) if results.failed? return results.first end |
#handle_highlighting(str, options = {}) ⇒ Object
If summon has put snippet highlighting tokens in a field, we need to HTML escape the literal values, while still using the highlighting tokens to put HTML tags around highlighted terms.
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# File 'app/search_engines/bento_search/summon_engine.rb', line 405 def handle_highlighting( str, = {} ) BentoSearch::Util.( str, :start_tag => @@hl_start_token, :end_tag => @@hl_end_token, :enabled => configuration.highlighting, :strip => [:strip] ) end |
#max_per_page ⇒ Object
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# File 'app/search_engines/bento_search/summon_engine.rb', line 439 def max_per_page 200 end |
#name_normalize(str) ⇒ Object
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# File 'app/search_engines/bento_search/summon_engine.rb', line 270 def name_normalize(str) return nil if str.blank? str = str.strip return nil if str.blank? || str =~ /^[,:.]*$/ return str end |
#normalize_content_type(summon_type) ⇒ Object
Normalize Summon Content-Type to our standardized list.
This ends up losing useful distinctions Summon makes, however.
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# File 'app/search_engines/bento_search/summon_engine.rb', line 252 def normalize_content_type(summon_type) case summon_type when "Journal Article", "Book Review", "Trade Publication Article", "Newspaper Article" then "Article" when "Audio Recording", "Music Recording", "Spoken Word Recording" then "AudioObject" when "Book", "eBook", "Book / eBook" then "Book" when "Book Chapter" then :book_item when "Conference Proceeding" then :conference_paper when "Dissertation" then :dissertation when "Journal", "Newsletter", "Newspaper" then :serial when "Photograph" then "Photograph" when "Report", "Technical Report" then "Report" when "Video Recording", "Film" then "VideoObject" when "Web Resource" then "WebPage" when "Computer File", "Data Set" then "SoftwareApplication" else nil end end |
#search_field_definitions ⇒ Object
Summon offers many more search fields than this. This is a subset listed here. See api.summon.serialssolutions.com/help/api/search/fields although those docs may not be up to date.
The AuthorCombined, TitleCombined, and SubjectCombined indexes aren’t even listed in the docs, but they are real. I think.
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# File 'app/search_engines/bento_search/summon_engine.rb', line 461 def search_field_definitions { nil => {:semantic => :general}, "AuthorCombined" => {:semantic => :author}, "TitleCombined" => {:semantic => :title}, # SubjectTerms does not include TemporalSubjectTerms # or Keywords, sorry. "SubjectTerms" => {:semantic => :subject}, # ISBN and ISSN do not include seperate EISSN and EISBN # fields, sorry. "ISBN" => {:semantic => :isbn}, "ISSN" => {:semantic => :issn}, "OCLC" => {:semantic => :oclcnum}, "PublicationSeriesTitle" => {:semantic => :source_title } } end |
#search_implementation(args) ⇒ Object
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# File 'app/search_engines/bento_search/summon_engine.rb', line 124 def search_implementation(args) uri, headers = construct_request(args) Rails.logger.debug("SummonEngine request URL: #{uri}") results = BentoSearch::Results.new hash, response, exception = nil begin response = http_client.get(uri, nil, headers) hash = MultiJson.load( response.body ) rescue BentoSearch::RubyTimeoutClass, HTTPClient::ConfigurationError, HTTPClient::BadResponseError, MultiJson::DecodeError, Nokogiri::SyntaxError => e exception = e end # handle some errors if (response.nil? || hash.nil? || exception || (! HTTP::Status.successful? response.status)) results.error ||= {} results.error[:exception] = e results.error[:status] = response.status if response return results end results.total_items = hash["recordCount"] hash["documents"].each do |doc_hash| item = BentoSearch::ResultItem.new item.custom_data["summon.original_data"] = doc_hash item.unique_id = first_if_present doc_hash["ID"] item.title = format_title(doc_hash) item.link = doc_hash["link"] # Don't understand difference between hasFullText and # isFullTextHit. ??. We'll use hasFullText for now, that's # the documented one. item.link_is_fulltext = doc_hash["hasFullText"] if configuration.use_summon_openurl item.openurl_kev_co = doc_hash["openUrl"] # Summon conveniently gives us pre-made OpenURL end item.journal_title = first_if_present doc_hash["PublicationTitle"] item.issn = first_if_present doc_hash["ISSN"] item.isbn = first_if_present doc_hash["ISBN"] item.doi = first_if_present doc_hash["DOI"] item.start_page = first_if_present doc_hash["StartPage"] item.end_page = first_if_present doc_hash["EndPage"] if (pubdate = first_if_present doc_hash["PublicationDate_xml"]) item.year = pubdate["year"] end item.volume = first_if_present doc_hash["Volume"] item.issue = first_if_present doc_hash["Issue"] if (pub = first_if_present doc_hash["Publisher_xml"]) item.publisher = pub["name"] end # if it's a dissertation, put the school in the 'publisher' field. # if we don't have one otherwise. if (! item.publisher) && (school = first_if_present doc_hash["DissertationSchool_xml"]) item.publisher = school["name"] end (doc_hash["Author_xml"] || []).each do |auth_hash| a = BentoSearch::Author.new a.first = name_normalize auth_hash["givenname"] a.last = name_normalize auth_hash["surname"] a.middle = name_normalize auth_hash["middlename"] a.display = name_normalize auth_hash["fullname"] item. << a unless a.empty? end item.format = normalize_content_type( first_if_present doc_hash["ContentType"] ) if doc_hash["ContentType"] item.format_str = doc_hash["ContentType"].join(", ") end item.language_str = first_if_present doc_hash["Language"] item.abstract = first_if_present doc_hash["Abstract"] # Just straight snippets if doc_hash["Snippet"] item.snippets = doc_hash["Snippet"].collect {|s| handle_highlighting(s)} end results << item end return results end |
#sort_definitions ⇒ Object
Summon actually only supports relevancy sort, and pub year asc or desc. we just expose relevance and pub year desc here.
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# File 'app/search_engines/bento_search/summon_engine.rb', line 445 def sort_definitions # implementation includes literal sersol value, but not yet # uri escaped, that'll happen at a later code point. { "relevance" => {:implementation => nil}, # default "date_desc" => {:implementation => "PublicationDate:desc"} } end |
#summon_escape(string) ⇒ Object
Escapes special chars for Summon. Not entirely clear what we have to escape where (or double escape sometimes?), but we’re just going to do a straight backslash escape of special chars.
Does NOT do URI-escaping, that’s a different step.
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# File 'app/search_engines/bento_search/summon_engine.rb', line 385 def summon_escape(string) # replace with backslash followed by original matched thing, # need to double backslash for ruby string literal makes # this ridiculously confusing, sorry. Block form of gsub # is the only thing that keeps it from being impossible. # # Do NOT escape double quotes, let people use them for # phrases! # # While docs suggest you have to double-slash escape hyphens, # in fact doing so ruins ID: search, so we don't. string.gsub(/([+&|!\(\){}\[\]^~*?\\:])/) do |match| "\\#{$1}" end end |