feat: added http gateway for grpc

internal/server/server.go

@@ -1,9 +1,11 @@
 package server
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"net"
+	"net/http"
 
 	"orderservice/internal/config"
 	"orderservice/internal/interceptor"
@@ -14,7 +16,9 @@ import (
 
 	pb "orderservice/pkg/api/order"
 
+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/reflection"
 )
 
@@ -37,6 +41,22 @@ func New(cfg *config.Config) *Server {
 	}
 }
 
+func runHTTPHandler(s *Server, grpcServerEndpoint *string) error {
+	ctx := context.Background()
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	mux := runtime.NewServeMux()
+	opts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
+	err := pb.RegisterOrderServiceHandlerFromEndpoint(ctx, mux, *grpcServerEndpoint, opts)
+	if err != nil {
+		return err
+	}
+
+	addr := fmt.Sprintf(":%d", s.config.HTTPPort)
+	return http.ListenAndServe(addr, mux)
+}
+
 func (s *Server) RegisterServices() {
 	repo := orderInMemory.NewOrderRepository()
 	orderService := service.NewOrderService(repo)
@@ -57,6 +77,15 @@ func (s *Server) Start() error {
 		return fmt.Errorf("failed to listen: %w", err)
 	}
 
+	if s.config.EnableHTTPHandler {
+		go func() {
+			log.Printf("Starting HTTP gateway on port %d", s.config.HTTPPort)
+			if err := runHTTPHandler(s, &addr); err != nil {
+				log.Printf("HTTP gateway failed: %v", err)
+			}
+		}()
+	}
+
 	log.Printf("Starting gRPC server on port %d", s.config.GRPCPort)
 
 	if err := s.grpcServer.Serve(lis); err != nil {