use auth service for validating user in competitions service

internal/competition/server/server.go

@@ -8,14 +8,17 @@ import (
 
 	"datarush/internal/competition/config"
 	grpcHandlers "datarush/internal/competition/handler/grpc"
+	"datarush/internal/competition/middleware"
 	"datarush/internal/competition/repository/postgres"
 	"datarush/internal/competition/service"
+	authpb "datarush/pkg/api/auth"
 	pb "datarush/pkg/api/competition"
 
 	"github.com/jmoiron/sqlx"
 	_ "github.com/lib/pq"
 	"github.com/redis/go-redis/v9"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/reflection"
 )
 
@@ -30,6 +33,7 @@ type Server struct {
 	config      *config.Config
 	db          *sqlx.DB
 	redisClient *redis.Client
+	authConn    *grpc.ClientConn
 }
 
 func New(cfg *config.Config) *Server {
@@ -51,6 +55,12 @@ func (s *Server) Start() error {
 		DB:       s.config.RedisDB,
 	})
 
+	authConn, err := grpc.Dial(s.config.AuthSvcAddr, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		return fmt.Errorf("failed to connect to auth service: %w", err)
+	}
+	s.authConn = authConn
+
 	if err := s.registerGRPCServices(); err != nil {
 		return fmt.Errorf("failed to register gRPC services: %w", err)
 	}
@@ -71,6 +81,13 @@ func (s *Server) Start() error {
 }
 
 func (s *Server) registerGRPCServices() error {
+	authClient := authpb.NewAuthServiceClient(s.authConn)
+	authInterceptor := middleware.NewAuthInterceptor(authClient)
+
+	s.grpcServer = grpc.NewServer(
+		grpc.UnaryInterceptor(authInterceptor.Unary()),
+	)
+
 	compRepo := postgres.NewCompetitionRepository(s.db, s.redisClient, s.config.CacheEnabled)
 	compService := service.NewCompetitionService(compRepo)
 	compHandler := grpcHandlers.NewCompetitionHandler(compService)
@@ -91,6 +108,12 @@ func (s *Server) Stop() {
 		s.grpcServer.GracefulStop()
 	}
 
+	if s.authConn != nil {
+		if err := s.authConn.Close(); err != nil {
+			log.Printf("failed to close auth service connection: %v", err)
+		}
+	}
+
 	if s.db != nil {
 		if err := s.db.Close(); err != nil {
 			log.Printf("failed to close database: %v", err)