feat: first

cmd/server/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"context"
+	"log"
+	"net"
+	"net/http"
+	"sync"
+
+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+
+	helloworldpb "go-grpc-gateway-template/proto/helloworld"
+)
+
+type server struct {
+	helloworldpb.UnimplementedGreeterServer
+}
+
+func (s *server) SayHello(ctx context.Context, req *helloworldpb.HelloRequest) (*helloworldpb.HelloReply, error) {
+	return &helloworldpb.HelloReply{
+		Message: "Hello " + req.GetName(),
+	}, nil
+}
+
+func main() {
+	// Create a listener on TCP port
+	lis, err := net.Listen("tcp", ":8080")
+	if err != nil {
+		log.Fatalln("Failed to listen:", err)
+	}
+
+	// Create a gRPC server object
+	s := grpc.NewServer()
+	// Attach the Greeter service to the server
+	helloworldpb.RegisterGreeterServer(s, &server{})
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	// Serve gRPC server
+	log.Println("Serving gRPC on 0.0.0.0:8080")
+	go func() {
+		defer wg.Done()
+		if err := s.Serve(lis); err != nil {
+			log.Fatalln("Failed to serve:", err)
+		}
+	}()
+
+	// Create a client connection to the gRPC server we just started
+	// This is where the gRPC-Gateway proxies the requests
+	conn, err := grpc.DialContext(
+		context.Background(),
+		"0.0.0.0:8080",
+		grpc.WithBlock(),
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+	)
+	if err != nil {
+		log.Fatalln("Failed to dial server:", err)
+	}
+
+	gwmux := runtime.NewServeMux()
+	// Register Greeter
+	err = helloworldpb.RegisterGreeterHandler(context.Background(), gwmux, conn)
+	if err != nil {
+		log.Fatalln("Failed to register gateway:", err)
+	}
+
+	gwServer := &http.Server{
+		Addr:    ":8090",
+		Handler: gwmux,
+	}
+
+	log.Println("Serving gRPC-Gateway on http://0.0.0.0:8090")
+	go func() {
+		defer wg.Done()
+		if err := gwServer.ListenAndServe(); err != nil {
+			log.Fatalln("Failed to serve gRPC-Gateway:", err)
+		}
+	}()
+
+	wg.Wait()
+}