func getNetworkInterface()

in internal/deployers/eksapi/node.go [750:781]

• 27 lines of code
• 4 McCabe index (conditional complexity)

func getNetworkInterface(opts *deployerOptions, networkCardIndex int, subnetIds []string, securityGroups []string) (templates.NetworkInterface, error) {
	// simplification that works with currently supported network interfaces based on
	// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html#network-cards
	// and
	// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/create-efa.html#efa-launch
	deviceIndex := 0
	if networkCardIndex > 0 {
		deviceIndex = 1
	}
	var description, interfaceType, subnetID *string
	if opts.EFA {
		if len(subnetIds) == 0 {
			return templates.NetworkInterface{}, fmt.Errorf("EFA interfaces require a subnet but none were provided")
		}
		subnetID = &subnetIds[0]
		interfaceType = aws.String("efa")
		description = aws.String("EFA-enabled network interface")
	} else {
		// no need to assign a subnet here, more restrictive than it is helpful
		interfaceType = aws.String("interface")
		description = aws.String("Standard network interface")
	}
	return templates.NetworkInterface{
		Description:         description,
		DeviceIndex:         &deviceIndex,
		NetworkCardIndex:    &networkCardIndex,
		InterfaceType:       interfaceType,
		SubnetId:            subnetID,
		Groups:              securityGroups,
		DeleteOnTermination: aws.Bool(true),
	}, nil
}