vcap_common.rb

opyright (c) 2009-2011 VMware, Inc.
    2 require 'fileutils'
  3 require 'logging'
    4 require 'socket'
      5 
        6 # VMware's Cloud Application Platform
          7 
            8 module VCAP
              9 
               10   A_ROOT_SERVER = '198.41.0.4'
                11 
                 12   def self.local_ip(route = A_ROOT_SERVER)
                  13     route ||= A_ROOT_SERVER
                   14     orig, Socket.do_not_reverse_lookup = Socket.do_not_reverse_lookup, true
                    15     UDPSocket.open {|s| s.connect(route, 1); s.addr.last }
                     16   ensure
                      17     Socket.do_not_reverse_lookup = orig
                       18   end
                        19 
                         20   def self.fast_uuid
                          21     values = [
                             22       rand(0x0010000),rand(0x0010000),rand(0x0010000),
                              23       rand(0x0010000),rand(0x0010000),rand(0x1000000),
                               24       rand(0x1000000),
                                25     ]
                                 26     "%04x%04x%04x%04x%04x%06x%06x" % values
                                  27   end
                                   28 
                                    29   def self.grab_ephemeral_port
                                     30     socket = TCPServer.new('0.0.0.0', 0)
                                      31     socket.setsockopt(Socket::SOL_SOCKET, Socket::SO_REUSEADDR, true)
                                       32     Socket.do_not_reverse_lookup = true
                                        33     port = socket.addr[1]
                                         34     socket.close
                                          35     return port
                                           36   end