Ruby Docker Client sample

docker_client_sample.rb

require 'docker'
require 'observer'

class DockerEvents
  include Observable
  def run
    Docker::Event.stream do |ev|
      changed
      notify_observers(ev)
    end
  end
end

module DockerEventHandler
  def update(ev)
    method_name = event_method_name(ev)
    send(method_name, ev) if respond_to? method_name
  end

  def event_method_name(ev)
    "on_#{ev.status}"
  end
end

class ContainerUpDownHandler
  include DockerEventHandler

  def on_start(ev)
    p [:start, ev]
  end

  def on_die(ev)
    p [:die, ev]
  end
end

if $0 == __FILE__
  events = DockerEvents.new
  events.add_observer(ContainerUpDownHandler.new)

  events.run
end