docker_shell.rb

# use case

    DockerShell.start("kroki_service", "yuzutech/kroki", "9001", "8000") do
      log stick :b, color, "I just think Ruby is the Best for coding!"
      sleep 10
    end

__BEGIN__

class MicroSystem::DockerShell < DevSystem::Shell

  def self.start(container_name, image, host_port, container_port, &block)
    new(container_name, image, host_port, container_port).start(&block)
  end

  def initialize(container_name, image, host_port, container_port)
    sufix = Time.now.to_i
    @container_name = "#{container_name}_#{sufix}"
    @image = image
    @host_port = host_port
    @container_port = container_port
  end

  def start(&block)
    Signal.trap("INT", &method(:interrupted))
  
    _start
    if block_given?
      block.call
      stop
    else
      log stick :b, :white, system.color, "Container #{@container_name} started."
    end
  end

  def _start
    string = "docker run -d -p#{@host_port}:#{@container_port} --name #{@container_name} #{@image}"
    log stick :b, :white, system.color, "Starting container: #{@container_name}"
    sh string
  end

  def stop
    log stick :b, :white, system.color, "Stopping container: #{@container_name}"
    sh "docker stop #{@container_name}"

    log stick :b, :white, system.color, "Removing container: #{@container_name}"
    sh "docker rm #{@container_name}"
  rescue
    log stick :red, "Failed to stop container #{@container_name}. Please check manually."
  end

  def interrupted(signo)
    log stick :red, "Caught SIGINT (#{signo}), stopping container..."
    stop
  end

end