fix disabled pprof server handling

backend/internal/observability/pprof.go

@@ -9,14 +9,14 @@ import (
 	"net/http"
 	"net/http/pprof"
 	"time"
-
 )
 
 type PprofServer struct {
-	name string
-	server *http.Server
+	name            string
+	server          *http.Server
 	shutdownTimeout time.Duration
 }
+
 func NewPprofMux() *http.ServeMux {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/debug/pprof/", pprof.Index)
@@ -29,20 +29,20 @@ func NewPprofMux() *http.ServeMux {
 }
 
 func NewPprofServer(name string, enabled bool, addr string) (*PprofServer, error) {
-	pprofServer := &PprofServer{
-		name: name,
-		shutdownTimeout: 3 * time.Second,
-	}
 	if !enabled || addr == "" {
-		return pprofServer, nil
+		return nil, nil
 	}
 	ln, err := net.Listen("tcp", addr)
 	if err != nil {
 		return nil, fmt.Errorf("failed to start %s pprof server on %s: %w", name, addr, err)
 	}
+	pprofServer := &PprofServer{
+		name:            name,
+		shutdownTimeout: 3 * time.Second,
+	}
 	pprofServer.server = &http.Server{
-		Addr: addr,
-		Handler: NewPprofMux(),
+		Addr:              addr,
+		Handler:           NewPprofMux(),
 		ReadHeaderTimeout: 5 * time.Second,
 	}
 	go func() {
@@ -54,7 +54,7 @@ func NewPprofServer(name string, enabled bool, addr string) (*PprofServer, error
 	return pprofServer, nil
 }
 
-func Shutdown(ctx context.Context, srv *http.Server) error{
+func Shutdown(ctx context.Context, srv *http.Server) error {
 	if srv == nil {
 		return nil
 	}
@@ -65,11 +65,11 @@ func (s *PprofServer) Close() error {
 	if s == nil {
 		return nil
 	}
-	shutdownCtx, cancel := context.WithTimeout(context.Background(), 3 * time.Second)
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), s.shutdownTimeout)
 	defer cancel()
 	if err := Shutdown(shutdownCtx, s.server); err != nil {
 		log.Printf("Failed to shutdown %s pprof server: %v", s.name, err)
-		return err	
+		return err
 	}
 	return nil
-}
+}