perpet.rb

#!/usr/bin/env ruby
class Watcher
  def watch
    loop do
      if unresponsive? && sleep(3) && unresponsive?
        restart
        sleep 20
      end
      sleep 5
    end
  end

  private

  SAFE = "HTTP/1.1 200 OK\r\n"

  def unresponsive?
    ret = `curl -q --max-time 10 -I http://localhost 2>/dev/null | head -n1`
    return false if ret == SAFE
    puts "[#{Time.new}] Not safe! Got: #{ret}"
    true
  end

  def restart
    puma_pid = current_puma_pid
    puts "Puma pid found: #{puma_pid.inspect}"
    kill(puma_pid)
    start
    puts "Done"
  end

  def current_puma_pid
    pid = `ps aux | grep puma | grep -v grep | grep -v pumactl | grep -v wtf | tr -s ' ' | cut -d' ' -f2`
    pid.chomp
  end

  def kill(pid)
    kill_cmd = "cd ~/cults3d.com/current && kill -9 #{pid}"
    puts "Killing puma via: #{kill_cmd}"
    `#{kill_cmd}`
  end

  def start
    start_cmd = "cd ~/cults3d.com/current && ./bin/puma -C config/puma.rb"
    puts "Spawn command: #{start_cmd.inspect}"
    `#{start_cmd}`
  end
end

Watcher.new.watch