Resolve "gNMI proto encoding"

Closes #70 (closed)

cmd/gnmi-target/target.go

+package main
+
+import (
+	"code.fbi.h-da.de/cocsn/gosdn/forks/google/gnmi"
+	"code.fbi.h-da.de/cocsn/gosdn/forks/google/gnmi/modeldata"
+	oc "code.fbi.h-da.de/cocsn/yang-models/generated/arista"
+	"context"
+	"flag"
+	"fmt"
+	"github.com/google/gnxi/utils/credentials"
+	pb "github.com/openconfig/gnmi/proto/gnmi"
+	"github.com/openconfig/ygot/ygot"
+	log "github.com/sirupsen/logrus"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/reflection"
+	"google.golang.org/grpc/status"
+	"net"
+	"os"
+	"reflect"
+)
+
+var (
+	bindAddr = flag.String("bind_address", ":9339", "Bind to address:port or just :port")
+)
+
+type server struct {
+	*gnmi.Server
+}
+
+func callback(newConfig ygot.ValidatedGoStruct) error {
+	// Apply the config to your device and return nil if success. return error if fails.
+	//
+	// Do something ...
+	return nil
+}
+
+func newServer(model *gnmi.Model, config []byte) (*server, error) {
+	s, err := gnmi.NewServer(model, config, callback)
+	if err != nil {
+		return nil, err
+	}
+	return &server{Server: s}, nil
+}
+
+// Get overrides the Get func of gnmi.Target to provide user auth.
+func (s *server) Get(ctx context.Context, req *pb.GetRequest) (*pb.GetResponse, error) {
+	msg, ok := credentials.AuthorizeUser(ctx)
+	if !ok {
+		log.Infof("denied a Get request: %v", msg)
+		return nil, status.Error(codes.PermissionDenied, msg)
+	}
+	log.Infof("allowed a Get request: %v", msg)
+	return s.Server.Get(ctx, req)
+}
+
+// Set overrides the Set func of gnmi.Target to provide user auth.
+/*
+func (s *server) Set(ctx context.Context, req *pb.SetRequest) (*pb.SetResponse, error) {
+	msg, ok := credentials.AuthorizeUser(ctx)
+	if !ok {
+		log.Infof("denied a Set request: %v", msg)
+		return nil, status.Error(codes.PermissionDenied, msg)
+	}
+	log.Infof("allowed a Set request: %v", msg)
+	return s.Server.Set(ctx, req)
+}
+*/
+
+func main() {
+
+	// Google stuff from here
+	model := gnmi.NewModel(modeldata.ModelData,
+		reflect.TypeOf((*oc.Device)(nil)),
+		oc.SchemaTree["Device"],
+		oc.Unmarshal,
+		oc.ΛEnum)
+
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Supported models:\n")
+		for _, m := range model.SupportedModels() {
+			fmt.Fprintf(os.Stderr, "  %s\n", m)
+		}
+		fmt.Fprintf(os.Stderr, "\n")
+		fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
+		flag.PrintDefaults()
+	}
+
+	flag.Set("logtostderr", "true")
+	flag.Parse()
+
+	g := grpc.NewServer()
+
+	var configData []byte
+	s, err := newServer(model, configData)
+	if err != nil {
+		log.Fatalf("error in creating gnmi target: %v", err)
+	}
+	pb.RegisterGNMIServer(g, s)
+	reflection.Register(g)
+
+	log.Infof("starting to listen on %s", *bindAddr)
+	listen, err := net.Listen("tcp", *bindAddr)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+
+	log.Info("starting to serve")
+	if err := g.Serve(listen); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+}