gistfile1.rb

  state_machine initial: :not_pulled do
    state :not_pulled
    state :pulling
    state :pulled

    state :code_copying
    state :code_copied

    state :creating
    state :created
    state :starting
    state :started
    state :stopping
    state :stopped
    state :failed
    state :outdated

    event :outdate do
      transition all => :outdated
    end

    event :pull do
      transition %i[not_pulled pulling
                    code_copying code_copied
                    creating created
                    starting started
                    stopping stopped] => :pulling,
                 if: ->(r) { r.server_status.alive? }
    end

    event :mark_as_pulled do
      transition pulling: :pulled
    end

    event :copy_code do
      transition %i[pulled code_copying] => :code_copying
    end

    event :mark_as_code_copied do
      transition code_copying: :code_copied
    end

    event :create_container do
      transition %i[stopped created starting started code_copied creating] => :creating
    end

    event :mark_as_created do
      transition creating: :created
    end

    event :start do
      transition %i[stopped created starting started] => :starting
    end

    event :mark_as_started do
      transition starting: :started
    end

    event :stop do
      transition %i[started stopping] => :stopping
    end

    event :mark_as_stopped do
      transition %i[stopping stopped] => :stopped
    end

    event :mark_as_failed do
      transition all => :failed
    end

    before_transition from: all - :stopping, to: :stopping, do: :set_last_attempt_to_stop
    before_transition to: :started, do: :set_started_at
  end