Class: Xapian::Indexer::Spider

Inherits:
Object
  • Object
show all
Defined in:
lib/xapian/indexer/spider.rb

Overview

Represents a process which consumes resources into the database and follows links to related resources

Defined Under Namespace

Classes: Fetch

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(database, generator, controller, options = {}) ⇒ Spider

database = Xapian::Database.new(ARGV)



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# File 'lib/xapian/indexer/spider.rb', line 32

def initialize(database, generator, controller, options = {})
	@database = database
	@generator = generator
	@controller = controller
	
	@links = []
	@touched = Set.new
	
	@logger = options[:logger] || Logger.new($stdout)
end

Instance Attribute Details

#resources ⇒ Object (readonly)

Returns the value of attribute resources.



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# File 'lib/xapian/indexer/spider.rb', line 43

def resources
  @resources
end

Instance Method Details

#add(root) ⇒ Object 



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# File 'lib/xapian/indexer/spider.rb', line 45

def add(root)
	case root
	when String
		@links << root
	when Array
		@links += root
	else
		@logger.error "Could not add roots #{root.inspect}!"
	end
end

#process(options = {}, &block) ⇒ Object 



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# File 'lib/xapian/indexer/spider.rb', line 106

def process(options = {}, &block)
	count = 0
	depth = 0
	
	until @links.empty?
		new_links = []
		
		@links.each do |link|
			# Mark and sweep - don't review the same resource twice!
			next if @touched.include?(link)
			@touched << link
			
			# Create a new fetch from the database...
			fetch = Fetch.new(@database, @controller, link)
			resource = fetch.current_resource
			
			# Does it already exist in the current database (and fresh?)
			unless fetch.archived_resource && fetch.archived_resource.fresh?
				# Fetch the resource and add it to the index
				begin
					@logger.info "Indexing #{resource.name}..."
					resource.fetch!
				rescue
					@logger.error "Could not fetch resource #{resource.name}: #{$!}!"
					$!.backtrace.each{|line| @logger.error(line)}
				end
				
				# Did we fetch a resource and was it indexable?
				if resource.fetched?
					if resource.content?
						doc = Xapian::Document.new
						doc.data = @controller.save(resource)
						doc.add_term(resource.name_digest)
			
						@generator.document = doc
						@generator.index_text(resource.content)
						@database.replace_document(resource.name_digest, doc)
					else
						@logger.warn "Resource was not indexable #{resource.name}!"
					end
				else
					@logger.warn "Could not fetch resource #{resource.name}!"
				end
			else
				@logger.info "Still fresh #{resource.name}..."
			end
			
			new_links += (fetch.links || []).map(&block).compact
			
			count += 1
			
			if options[:count] && count > options[:count]
				# If we have to leave before finishing this breadth...
				@links += new_links
				return count
			end
		end
		
		@links = new_links
		
		depth += 1
		
		return count if options[:depth] && depth > options[:depth]
	end
end

#remove_old! ⇒ Object 



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# File 'lib/xapian/indexer/spider.rb', line 172

def remove_old!
	postlist = @database.postlist("")
	
	postlist.each do |post|
		document = @database.document(post.docid)
		resource = @controller.recreate(document.data)
		
		unless resource.fresh?
			@logger.info "Removing expired index for #{resource.name}."
			@database.delete_document(post.docid)
		end
	end
end