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

#databaseObject (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