Class: BentoSearch::XerxesEngine
- Inherits:
-
Object
- Object
- BentoSearch::XerxesEngine
- Extended by:
- HTTPClientPatch::IncludeClient
- Includes:
- SearchEngine
- Defined in:
- app/search_engines/bento_search/xerxes_engine.rb
Overview
a **very limited and hacky** bento search engine for the Xerxes Metalib front-end. Probably not suitable for real production use, just a demo, and used for testing. Does not support pagination, or fielded searching. will do a new Metalib search every time you call it, which will be slow.
Machine running this code needs to have IP-address authorization to search xerxes.
jrochkind is using it for his article search provider comparison testing instrument.
Constant Summary
Constants included from SearchEngine
Class Method Summary collapse
-
.required_configuration ⇒ Object
also optional configuration [xerxes_context] will send as ‘context’ query param to xerxes, for analytics.
Instance Method Summary collapse
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 SearchEngine::Capabilities
#max_per_page, #multi_field_search?, #search_field_definitions, #search_keys, #semantic_search_keys, #semantic_search_map, #sort_definitions, #sort_keys
Class Method Details
.required_configuration ⇒ Object
also optional configuration
- xerxes_context
-
will send as ‘context’ query param to xerxes, for analytics
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# File 'app/search_engines/bento_search/xerxes_engine.rb', line 29 def self.required_configuration ["base_url", "databases"] end |
Instance Method Details
#search_implementation(arguments) ⇒ Object
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# File 'app/search_engines/bento_search/xerxes_engine.rb', line 33 def search_implementation(arguments) # We're gonna have to do a search 'screen scrape' style, then refresh it # until it's ready, and then request format=xerxes when it's ready # to get XML. A bit hacky. request_url = xerxes_search_url(arguments) response = http_client.head request_url # It's supposed to be a redirect unless HTTP::Status.redirect?(response.status) && response.headers["Location"] r = Results.new r.error ||= {} r.error["status"] = response.status r.error["message"] = "Xerxes did not return expected 302 redirect" return r end # Okay, now fetch the redirect, have to change it to an absolute # URI cause Xerxes semi-illegally returns a relative one. refreshes = 0 results_url = nil status_url = (URI.parse(request_url) + response.headers["Location"]).to_s while ( refreshes < 5 ) # cause of VCR, can't request the exact same URL twice # with different results. Add `try` on the end. response = http_client.get( status_url + "&try=#{refreshes}") # Okay, have to follow the meta-refresh html = Nokogiri::HTML( response.body ) if HTTP::Status.redirect? response.status # Okay, redirect means we're done with status and # we've got actual results url results_url = URI.parse(request_url) + response.headers["Location"] break end if ( refresh = html.css("meta[http-equiv='refresh']") ) wait = configuration.lookup!("refresh_wait", (refresh.attribute("content").value.to_i if refresh.attribute("content"))) # wait how long Xerxes asked before refreshing. refreshes += 1 sleep wait end end results = Results.new # any errors? if results_url.nil? && refreshes >= 5 results.error ||= {} results.error["message"] = "#{refreshes} refreshes exceeded maximum" return results end # Okay, fetch it as format xerxes xml = Nokogiri::XML( http_client.get(results_url.to_s + "&format=xerxes").body ) results = Results.new xml.xpath("//results/records/record").each do |record| item = ResultItem.new results << item item.title = node_text record.at_xpath("xerxes_record/title") xerxes_fmt_str = node_text(record.at_xpath("xerxes_record/format")).downcase item.format = if xerxes_fmt_str.include?("article") "Article" elsif xerxes_fmt_str.include?("Book") "Book" else nil end item.link = node_text record.at_xpath("xerxes_record/links/link[@type='original_record']/url") item.year = node_text record.at_xpath("xerxes_record/year") item.volume = node_text record.at_xpath("xerxes_record/volume") item.issue = node_text record.at_xpath("xerxes_record/issue") item.start_page = node_text record.at_xpath("xerxes_record/start_page") item.end_page = node_text record.at_xpath("xerxes_record/end_page") item.abstract = node_text(record.at_xpath("xerxes_record/abstract") || record.at_xpath("xerxes_record/summary")) item.openurl_kev_co = node_text record.at_xpath("openurl_kev_co") # have to get journal title out of openurl, sorry if item.openurl_kev_co openurl = OpenURL::ContextObject.new_from_kev( item.openurl_kev_co ) if openurl && openurl.referent && openurl.referent.format == "journal" item.journal_title = openurl.referent.jtitle end end item.issn = node_text record.at_xpath("xerxes_record/standard_numbers/issn") # authors record.xpath("xerxes_record/authors/author").each do || next unless .at_xpath("aulast") # don't even have a lastname, we can do nothing item. << Author.new(:first => node_text(.at_xpath("aufirst")), :middle => node_text(.at_xpath("auinit")), :last => node_text(.at_xpath("aulast")) ) end end return results end |