gistfile1.rb

require 'celluloid'

class Something
  class RemoteScriptError < RuntimeError; end

  include Celluloid

  def ssh_command(*)
    [false, Struct.new(:stdout, :stderr).new("out", "err")]
  end

  def ruby_script(name, host, options = {})
    name    = name.split('.rb')[0]
    script  = "script" # File.read(MB.scripts.join("#{name}.rb"))
    command = "command" # #{EMBEDDED_RUBY_PATH} -e '#{script}'"
    status, response = ssh_command(host, command, options)

    case status
    when :ok
      response.stdout.chomp
    when :error
      abort RemoteScriptError.new(response.stderr.chomp)
    end
  end

  def node_name(host, options = {})
    ruby_script('node_name', host, options)
  rescue RemoteScriptError
    nil
  end
end

class Worker
  include Celluloid

  def initialize
    @something = Something.new
  end

  def nodes
    f = @something.future(:node_name, "hello.local")

    f.value # expect nil but get RemoteScriptError
  end
end

p Worker.new.nodes