added cache only access server

cmd/cachefs/main.go

@@ -27,6 +27,7 @@ var (
 	metadata     string
 	listenHttp   string
 	listenWebdav string
+	listenCache  string
 	quota        int64
 
 	log logr.Logger
@@ -41,6 +42,7 @@ func main() {
 	flag.StringVar(&metadata, "data", "", "path to metadata file")
 	flag.StringVar(&listenHttp, "listen", "127.0.0.1:8080", "listen addr:port")
 	flag.StringVar(&listenWebdav, "webdav", "", "listen addr:port for webdav")
+	flag.StringVar(&listenCache, "cache", "", "listen addr:port for cache only")
 	flag.Int64Var(&quota, "quota", 1, "max disk usage quota in GiB")
 	flag.Parse()
 
@@ -51,14 +53,23 @@ func main() {
 	if err != nil {
 		klog.Fatalf("init failed: %s", err)
 	}
-	s := &http.Server{Addr: listenHttp, Handler: srv.NewFileServer(filesystem, klogr.New().WithName("server"))}
+	s := &http.Server{
+		Addr: listenHttp,
+		Handler: srv.NewFileServer(
+			filesystem,
+			klogr.New().WithName("server"),
+		),
+	}
 	go func() {
 		err := s.ListenAndServe()
 		if err != nil && err != http.ErrServerClosed {
 			klog.Fatalf("init failed: %s", err)
 		}
 	}()
-	var dav *http.Server
+	var (
+		dav   *http.Server
+		cache *http.Server
+	)
 	if listenWebdav != "" {
 		dav = &http.Server{
 			Addr: listenWebdav,
@@ -74,6 +85,21 @@ func main() {
 			}
 		}()
 	}
+	if listenCache != "" {
+		cache = &http.Server{
+			Addr: listenCache,
+			Handler: srv.NewCacheServer(
+				filesystem,
+				klogr.New().WithName("cache"),
+			),
+		}
+		go func() {
+			err := cache.ListenAndServe()
+			if err != nil && err != http.ErrServerClosed {
+				klog.Fatalf("init failed: %s", err)
+			}
+		}()
+	}
 	sigs := make(chan os.Signal, 1)
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
 	<-sigs
@@ -86,6 +112,11 @@ func main() {
 		dav.Shutdown(ctx)
 		cancel()
 	}
+	if cache != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+		cache.Shutdown(ctx)
+		cancel()
+	}
 	filesystem.Close()
 	log.Info("cachefs shutdown completed")
 	os.Exit(0)