A Ruby (multithreaded) Cloud App Roulette

cloud_app_roulette.rb

require 'net/http'
require 'thread'

$o =  [('a'..'z'),('A'..'Z'),(0..9)].map{|i| i.to_a}.flatten;
$n_found = 0
$mutex = Mutex.new

def generate
  generated = (0...4).map{ $o[rand($o.length)] }.join;
end

def thread_body
  Net::HTTP.start('cl.ly', 80) do |http|
    generated = generate
    response = http.head("/" + generated)
    if response.code == "200"
      $mutex.synchronize do
        $n_found += 1
      end
      puts "http://cl.ly/" + generated
    end
  end
end

found = false
i = 0
while !found && i < 64000
  thread = Thread.new do
    i += 1
    thread_body
  end
  thread.run
  $mutex.synchronize do
    if $n_found >= 20
      found = true
    end
  end
end