unicorn

  app_dir = "/app"

  worker_processes 30
  working_directory app_dir

  timeout 180

  listen "/tmp/unicorn.sock", :backlog => 1024

  pid app_dir + "/tmp:/unicorn.pid"

  stderr_path "#{app_dir}/log/unicorn.stderr.log"
  stdout_path "#{app_dir}/log/unicorn.stdout.log"

  preload_app true

  GC.respond_to?(:copy_on_write_friendly=) and  GC.copy_on_write_friendly = true

  before_exec do |server|
    ENV["BUNDLE_GEMFILE"] = app_dir + "/Gemfile"
  end

  before_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!

    # kills old children after zero downtime deploy
    old_pid = "#{server.config[:pid]}.oldbin"
    if old_pid != server.pid
      begin
        sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
        Process.kill(sig, File.read(old_pid).to_i)
      rescue Errno::ENOENT, Errno::ESRCH
      end
    end

    sleep 1
  end

  after_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection

    defined?(Rails) and Rails.cache.respond_to?(:reconnect) and Rails.cache.reconnect
  end