box-o-sand/ruby-sockets/marco-polo/client.rb

require 'socket'

successes = 0
backoff = 0.5
loop do
  begin
    TCPSocket.open('127.0.0.1', 22000) do |sock|
      sock.send("sally #{rand(101)} #{rand(101)}\n", 0)
      sock.recv(100)
      sock.close
      STDOUT.write('.')
      STDOUT.flush
    end
    successes += 1
    backoff = 0.5
    sleep 0.01 if ENV['SLEEP']
  rescue
    STDOUT.write('E')
    STDOUT.flush
    STDERR.write("\nmade it #{successes} times. sleeping #{backoff} secs\n")
    successes = 0
    sleep backoff
    backoff *= 2
  end
end