Class: ITACH::Detect

Inherits:
Object
  • Object
show all
Defined in:
lib/itach/detect.rb

Class Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Detect

Returns a new instance of Detect.



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# File 'lib/itach/detect.rb', line 18

def initialize options={}
  @address  = ENV['ITACH_ADDRESS'] || '239.255.250.250'
  @port     = ENV['ITACH_PORT']    || 9131
  @timeout  = options[:timeout]    || 20
end

Class Attribute Details

.ip ⇒ Object (readonly)

Returns the value of attribute ip.



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# File 'lib/itach/detect.rb', line 6

def ip
  @ip
end

Instance Method Details

#find_device ⇒ Object 



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# File 'lib/itach/detect.rb', line 39

def find_device
  begin
    Timeout::timeout(@timeout) do
      begin
        socket.bind(Socket::INADDR_ANY, @port)
        loop do
          msg, info = @socket.recvfrom(1024)
          if info
            @@ip = info[2]
            return "iTach found at #{info[2]}."
          end
        end
      ensure
        @socket.close
      end
    end
  rescue Timeout::Error
    puts "An iTach device was not fount within #{@timeout} seconds."
  end
end

#ip ⇒ Object 



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# File 'lib/itach/detect.rb', line 24

def ip
  @ip ||= IPAddr.new(@address).hton + IPAddr.new("0.0.0.0").hton
end

#socket ⇒ Object 



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# File 'lib/itach/detect.rb', line 28

def socket
  begin
    @socket = UDPSocket.new
    @socket.setsockopt(Socket::IPPROTO_IP, Socket::IP_ADD_MEMBERSHIP, ip)
    @socket
  rescue Errno::EADDRINUSE
    @socket.close
    socket
  end
end