Class: Xapian::Rack::Search

Inherits:
Object
  • Object
show all
Defined in:
lib/xapian/rack/search.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ Search

Returns a new instance of Search.



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# File 'lib/xapian/rack/search.rb', line 73

def initialize(app, options = {})
  @app = app
  @database_path = options[:database]
  @database = nil
  
  unless options[:logger]
    options[:logger] = Logger.new($stderr)
    options[:logger].level = Logger::DEBUG
  end
  
  # Setup the controller
  @controller = Xapian::Indexer::Controller.new(options)
  
  @controller.loaders << RelativeLoader.new(@app)
  @controller.loaders << Xapian::Indexer::Loaders::HTTP.new(options)
  @controller.extractors['text/html'] = Xapian::Indexer::Extractors::HTML.new(options)
  
  # Setup the generator
  @generator = Xapian::TermGenerator.new()
  
  @logger = options[:logger]
  
  unless options[:indexer] == :disabled
    @indexer = Thread.new do
      while true
        begin
          @logger.info "Updating index in background..."
          index(options[:roots], options)
          @logger.info "Index update finished successfully."
        rescue
          @logger.error "Index update failed: #{$!}"
          $!.backtrace.each{|line| @logger.error(line)}
        end
        
        sleep options[:refresh] || 3600
      end
    end
  end
end

Instance Attribute Details

#database ⇒ Object (readonly)

Returns the value of attribute database.



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# File 'lib/xapian/rack/search.rb', line 166

def database
  @database
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/xapian/rack/search.rb', line 168

def call(env)
  env['xapian.search'] = self
  return @app.call(env)
end

#find(query, options = {}) ⇒ Object 



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# File 'lib/xapian/rack/search.rb', line 113

def find(query, options = {})
  if @database
    @database.reopen
  else
    @database = Xapian::Database.new(@database_path)
  end
  
  # Start an enquire session.
  enquire = Xapian::Enquire.new(@database)

  # Setup the query parser
  qp = Xapian::QueryParser.new()
  qp.database = @database
  query = qp.parse_query(query, options[:flags] || 0)

  enquire.query = query
  
  start = options[:start] || 0
  count = options[:count] || 10
  
  matchset = enquire.mset(start, count)
  
  return matchset
end

#index(roots, options = {}) ⇒ Object 



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# File 'lib/xapian/rack/search.rb', line 138

def index(roots, options = {})
  writable_database = Xapian::WritableDatabase.new(@database_path, Xapian::DB_CREATE_OR_OPEN)
  @logger.debug "Opening xapian database for writing: #{@database_path}"
  
  begin
    spider = Xapian::Indexer::Spider.new(writable_database, @generator, @controller)
  
    spider.add(roots)
  
    spider.process(options) do |link|
      uri = URI.parse(link)
    
      if uri.relative?
        link
      elsif options[:domains] && options[:domains].include?(uri.host)
        link
      else
        nil
      end
    end
  
    spider.remove_old!
  ensure
    @logger.debug "Closing xapian database: #{@database_path}"
    writable_database.close
  end
end