Add Server.Version and cmd/client test code

Signed-off-by: Haiyan Meng <hmeng@redhat.com>

cmd/client/main.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	pb "github.com/kubernetes/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
+	"github.com/urfave/cli"
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+)
+
+const (
+	address = "localhost:49999"
+)
+
+// Version sends a VersionRequest to the server, and parses the returned VersionResponse.
+func Version(client pb.RuntimeServiceClient, version string) error {
+	r, err := client.Version(context.Background(), &pb.VersionRequest{Version: &version})
+	if err != nil {
+		return err
+	}
+	log.Printf("VersionResponse: Version: %s, RuntimeName: %s, RuntimeVersion: %s, RuntimeApiVersion: %s\n", *r.Version, *r.RuntimeName, *r.RuntimeVersion, *r.RuntimeApiVersion)
+	return nil
+}
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "ocidclient"
+	app.Usage = "Testing services provided by ocid"
+	app.Flags = []cli.Flag{
+		cli.StringFlag{
+			Name:  "runtimeversion",
+			Value: "715fec664d75c6b5cb5b12718458621d4b75df37",
+			Usage: "the version of the gPRC client API",
+		},
+	}
+	app.Action = func(cxt *cli.Context) error {
+		// Set up a connection to the server.
+		conn, err := grpc.Dial(address, grpc.WithInsecure())
+		if err != nil {
+			log.Fatalf("Failed to connect: %v", err)
+		}
+		defer conn.Close()
+		client := pb.NewRuntimeServiceClient(conn)
+
+		// Test RuntimeServiceClient.Version
+		err = Version(client, cxt.String("runtimeversion"))
+		if err != nil {
+			log.Fatalf("%s.Version failed: %v", app.Name, err)
+		}
+
+		return nil
+	}
+
+	app.Run(os.Args)
+}