agent/acs/handler/attach_eni_handler.go
func (attachENIHandler *attachENIHandler) handlerFunc() func(message *ecsacs.AttachTaskNetworkInterfacesMessage) {
	return func(message *ecsacs.AttachTaskNetworkInterfacesMessage) {
		attachENIHandler.messageBuffer <- message
	}
}
func (attachENIHandler *attachENIHandler) handlerFunc() func(message *ecsacs.AttachTaskNetworkInterfacesMessage) {
	return func(message *ecsacs.AttachTaskNetworkInterfacesMessage) {
		attachENIHandler.messageBuffer <- message
	}
}
// handlerFunc returns a function to enqueue requests onto attachENIHandler buffer