class Fabio < Formula
  desc "Zero-conf load balancing HTTP(S) router"
  homepage "https://github.com/eBay/fabio"
  url "https://github.com/eBay/fabio/archive/v1.4.tar.gz"
  sha256 "e595778c325eb79b5fc2c17f409a53d73c4cfa3d5a53083092bf72edf113f947"
  head "https://github.com/eBay/fabio.git"

  bottle do
    cellar :any_skip_relocation
    sha256 "b22bbf0d6ff957ff1e5d447daf5bf1a494c0521a7e708f5a3ef280f5ea44ef56" => :sierra
    sha256 "b52fbe26fd05730dfeecf7189c884ca5b27fe32b63c22f8a5c2ac30bcb4ef055" => :el_capitan
    sha256 "e565453d669349d7fe40390776a5de34c008fbdcce7c9daf7e9ec06ee20bd6dc" => :yosemite
  end

  depends_on "go" => :build
  depends_on "consul" => :recommended

  def install
    mkdir_p buildpath/"src/github.com/eBay"
    ln_s buildpath, buildpath/"src/github.com/eBay/fabio"

    ENV["GOPATH"] = buildpath.to_s

    system "go", "install", "github.com/eBay/fabio"
    bin.install "#{buildpath}/bin/fabio"
  end

  test do
    require "socket"
    require "timeout"

    CONSUL_DEFAULT_PORT = 8500
    FABIO_DEFAULT_PORT = 9999
    LOCALHOST_IP = "127.0.0.1".freeze

    def port_open?(ip, port, seconds = 1)
      Timeout.timeout(seconds) do
        begin
          TCPSocket.new(ip, port).close
          true
        rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
          false
        end
      end
    rescue Timeout::Error
      false
    end

    if !port_open?(LOCALHOST_IP, FABIO_DEFAULT_PORT)
      if !port_open?(LOCALHOST_IP, CONSUL_DEFAULT_PORT)
        fork do
          exec "consul agent -dev -bind 127.0.0.1"
          puts "consul started"
        end
        sleep 15
      else
        puts "Consul already running"
      end
      fork do
        exec "#{bin}/fabio &>fabio-start.out&"
        puts "fabio started"
      end
      sleep 5
      assert_equal true, port_open?(LOCALHOST_IP, FABIO_DEFAULT_PORT)
      system "killall", "fabio" # fabio forks off from the fork...
      system "consul", "leave"
    else
      puts "Fabio already running or Consul not available or starting fabio failed."
      false
    end
  end
end