dual_server.rb

require 'thin'

module Thin
  module Backends
    class DualServer < Base
      # UNIX domain socket on which the server is listening for connections.
      attr_accessor :socket, :host, :port
      
      def initialize(host, port, opts={})
        puts "host #{host.inspect} port #{port.inspect} opts #{opts.inspect}"
        raise PlatformNotSupported, 'UNIX domain sockets not available on Windows' if Thin.win?
        @socket = opts[:socket]
        @host = host
        @port = port
        super()
      end
      
      # Connect the server
      def connect
        at_exit { remove_socket_file } # In case it crashes
        EventMachine.start_unix_domain_server(@socket, UnixConnection, &method(:initialize_connection))
        # HACK EventMachine.start_unix_domain_server doesn't return the connection signature
        #      so we have to go in the internal stuff to find it.
        @unix_signature = EventMachine.instance_eval{@acceptors.keys.first}
        @tcp_signature = EventMachine.start_server(@host, @port, Thin::Connection, &method(:initialize_connection))
        
      end
      
      # Stops the server
      def disconnect
        EventMachine.stop_server(@unix_signature)
        EventMachine.stop_server(@signature)
      end
      
      # Free up resources used by the backend.
      def close
        remove_socket_file
      end
      
      def to_s
        @socket
      end
      
      protected
        def remove_socket_file
          File.delete(@socket) if @socket && File.exist?(@socket)
        end
    end
  end
  
  class UnixConnection < Connection
    protected
      def socket_address        
        '127.0.0.1' # Unix domain sockets can only be local
      end
  end
end