Class: DockerBoss::Module::Templates::Instance

Inherits:
Object
  • Object
show all
Defined in:
lib/docker_boss/modules/templates.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, config) ⇒ Instance

Returns a new instance of Instance.



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# File 'lib/docker_boss/modules/templates.rb', line 36

def initialize(name, config)
  @name = name
  @config = config
  DockerBoss.logger.debug "templates: Instance `#{@name}`: created"
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/docker_boss/modules/templates.rb', line 34

def name
  @name
end

Instance Method Details

#do_actions ⇒ Object 



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# File 'lib/docker_boss/modules/templates.rb', line 56

def do_actions
  err = false

  if @config.has_key? 'action'
    err ||= !system(@config['action'])
  end

  if @config.has_key? 'linked_container' and @config['linked_container'].has_key? 'action'
    args = @config['linked_container']['action'].split(':', 2)
    case args.first
    when 'shell'
      raise ArgumentError, "action `shell` needs at least one more argument" if args.size < 2
      command = ["sh", "-c", args[1]]
      linked_container.exec(command)
    when 'shell_bg'
      raise ArgumentError, "action `shell_bg` needs at least one more argument" if args.size < 2
      command = ["sh", "-c", args[1]]
      linked_container.exec(command, detach: true)
    when 'exec'
      raise ArgumentError, "action `exec` needs at least one more argument" if args.size < 2
      linked_container.exec(Shellwords.split(args[1]))
    when 'exec_bg'
      raise ArgumentError, "action `exec_bg` needs at least one more argument" if args.size < 2
      linked_container.exec(Shellwords.split(args[1]), detach: true)
    when 'restart'
      linked_container.restart
    when 'start'
      linked_container.start
    when 'stop'
      linked_container.stop
    when 'pause'
      linked_container.pause
    when 'unpause'
      linked_container.unpause
    when 'kill'
      if args.size == 2
        linked_container.kill(:signal => args[1])
      else
        linked_container.kill
      end
    else
      raise ArgumentError, "unknown action `#{args.first}`"
    end
  end
end

#do_file(f, containers) ⇒ Object 



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# File 'lib/docker_boss/modules/templates.rb', line 42

def do_file(f, containers)
  tmpl_path = DockerBoss::Helpers.render_erb(f['template'], :container => linked_container.json)
  file_path = DockerBoss::Helpers.render_erb(f['file'], :container => linked_container.json)

  file_contents = DockerBoss::Helpers.render_erb_file(tmpl_path, :containers => containers)

  new_digest = Digest::SHA256.hexdigest file_contents
  old_digest = (f.has_key? 'checksum') ? f['checksum'] : ""
  f['checksum'] = new_digest

  File.write(file_path, file_contents) if new_digest != old_digest
  new_digest != old_digest
end

#has_link? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/docker_boss/modules/templates.rb', line 115

def has_link?
  @config.has_key? 'linked_container'
end

#linked_container ⇒ Object 



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# File 'lib/docker_boss/modules/templates.rb', line 119

def linked_container
  if has_link?
    (Docker::Container.all(:all => true).find { |c| c.json['Name'] == "/#{@config['linked_container']['name']}" })
  else
    nil
  end
end

#linked_container_props ⇒ Object 



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# File 'lib/docker_boss/modules/templates.rb', line 127

def linked_container_props
  data = linked_container.json
end

#trigger(containers, trigger_id = nil) ⇒ Object 



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# File 'lib/docker_boss/modules/templates.rb', line 102

def trigger(containers, trigger_id = nil)
  if trigger_id.nil? or
      not has_link? or
      linked_container.id != trigger_id
    # Only do something if the linked container is not also the triggering container
    changed = @config['files'].inject (false) { |changed,f| do_file(f, containers) || changed }
    DockerBoss.logger.info "templates: Instance `#{@name}`: triggered; changed=#{changed}"
    do_actions if changed
  else
    DockerBoss.logger.info "templates: Instance `#{@name}`: ignored event"
  end
end