add redis cache to results

internal/results/server/server.go

@@ -15,6 +15,7 @@ import (
 
 	"github.com/jmoiron/sqlx"
 	_ "github.com/lib/pq"
+	"github.com/redis/go-redis/v9"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/reflection"
 )
@@ -30,6 +31,7 @@ type Server struct {
 	httpServer *http.Server
 	config     *config.Config
 	db         *sqlx.DB
+	redis      *redis.Client
 }
 
 func New(cfg *config.Config) *Server {
@@ -45,6 +47,11 @@ func (s *Server) Start() error {
 	}
 	s.db = db
 
+	redisClient := redis.NewClient(&redis.Options{
+		Addr: s.config.RedisAddr,
+	})
+	s.redis = redisClient
+
 	go func() {
 		if err := s.startGRPCServer(); err != nil {
 			log.Fatalf("failed to start gRPC server: %v", err)
@@ -69,7 +76,7 @@ func (s *Server) startGRPCServer() error {
 }
 
 func (s *Server) registerGRPCServices() {
-	resultRepo := postgres.NewResultRepository(s.db.DB, nil, false)
+	resultRepo := postgres.NewResultRepository(s.db.DB, s.redis, s.config.CacheEnabled)
 	resultService := service.NewService(resultRepo)
 	resultHandler := grpcHandlers.NewResultsHandler(
 		resultService,
@@ -98,5 +105,11 @@ func (s *Server) Stop() {
 		}
 	}
 
+	if s.redis != nil {
+		if err := s.redis.Close(); err != nil {
+			log.Printf("failed to close redis connection: %v", err)
+		}
+	}
+
 	log.Println("results server stopped")
-}
+}