Module: Thecon

Defined in:
lib/thecon.rb,
lib/thecon/version.rb

Constant Summary collapse

VERSION = 
"0.0.4"

Class Method Summary collapse

Class Method Details

.ready?(port = 80, ip = "localhost", connection_timeout = 3, read_timeout = 2) ⇒ Boolean

Your code goes here…

Returns:

  • (Boolean) 


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# File 'lib/thecon.rb', line 10

def self.ready?(port=80, ip = "localhost", connection_timeout = 3, read_timeout = 2)
  @log = Logger.new(STDOUT)

  port ||= 80
  result = false
  begin
    timeout( connection_timeout ) do
      socket = Socket.new :INET, :STREAM
      sockaddr = Socket.pack_sockaddr_in port, ip
      socket.connect sockaddr
      begin
        timeout( read_timeout ) do
          begin

          response = socket.read_nonblock(1)

          r,w,e = select([socket], nil, nil, 1) # nil, nil, nil from inside the network
          result = true
          rescue IO::WaitReadable
            @log.debug "Wait readable"
            r,w,e = select([socket], nil, nil, 1) # nil, nil, nil from inside the network
            unless r.nil? then
              if r[0].read(1).nil?
                @log.debug "Readable socket was closed / there is NOTHING there"
                result = false
              else
                @log.debug "There is something there" 
                result = true
              end
            else
              @log.debug "not available for read: either doesn't exist or not closed" #TRUE
              result = true
            end
          rescue IO::WaitWritable
          end

        end
      rescue StandardError => ka #This can get triggered i
        @log.debug "OK, standardERROR #{ka}" #If socket.read there could be errors (this shouldn't be triggered)
        result = true
      rescue Timeout::Error => e
        @log.debug "timedout reading" #Socket is there but there are not data to read (if socket.read)
        result = true
      end
    end
  rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
    result=false # Connection fails on its own
  rescue Timeout::Error, StandardError => e
    result=false # When host or port is wrong (connection timesout or some other Errno)
  rescue
  end

  result
end