type NetworkError struct {
	Err error
}

func (n *NetworkError) Error() string {
	return n.Err.Error()
}

// Unwrap returns the error wrapped in NetworkError.
func (n *NetworkError) Unwrap() error {
	return n.Err
}

// Client - http based RPC client.
type Client struct {
	connected int32 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG

		Config: adsc.Config{
			Meta: model.NodeMetadata{
				Generator:      "event",
				ServiceAccount: serviceAccount,
				Namespace:      ns,
				CloudrunAddr:   opts.IstiodAddr,
			}.ToStruct(),
			CertDir:            opts.CertDir,
			InsecureSkipVerify: opts.InsecureSkipVerify,
			XDSSAN:             opts.XDSSAN,
			GrpcOpts:           grpcOpts,
		},
	}, nil)
	if err != nil {