type gRPCService struct {
	kmsClient   kmsapi.KeyManagementServiceClient
	connection  *grpc.ClientConn
	callTimeout time.Duration
}

// NewGRPCService returns an envelope.Service which use gRPC to communicate the remote KMS provider.
func NewGRPCService(ctx context.Context, endpoint, providerName string, callTimeout time.Duration) (kmsservice.Service, error) {
	klog.V(4).InfoS("Configure KMS provider", "endpoint", endpoint)

	connection     *grpc.ClientConn
	callTimeout    time.Duration
	mux            sync.RWMutex
	versionChecked bool
}

// NewGRPCService returns an envelope.Service which use gRPC to communicate the remote KMS provider.
func NewGRPCService(ctx context.Context, endpoint string, callTimeout time.Duration) (Service, error) {
	klog.V(4).InfoS("Configure KMS provider", "endpoint", endpoint)