code: func (attachENIHandler *attachENIHandler) handlerFunc() func(message *ecsacs.AttachTaskNetworkInterfacesMessage) {
  	return func(message *ecsacs.AttachTaskNetworkInterfacesMessage) {
  		attachENIHandler.messageBuffer <- message
  	}
  }
docs: // handlerFunc returns a function to enqueue requests onto attachENIHandler buffer