[#9999] fstree: Add IterateInfo method

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobstor/fstree/fstree.go

@@ -222,6 +222,82 @@ func (t *FSTree) iterate(ctx context.Context, depth uint64, curPath []string, pr
 	return nil
 }
 
+type ObjectInfo struct {
+	Address  oid.Address
+	DataSize uint64
+}
+type IterateInfoHandler func(ObjectInfo) error
+
+func (t *FSTree) IterateInfo(ctx context.Context, handler IterateInfoHandler) error {
+	var (
+		err       error
+		startedAt = time.Now()
+	)
+	defer func() {
+		t.metrics.IterateInfo(time.Since(startedAt), err == nil)
+	}()
+	_, span := tracing.StartSpanFromContext(ctx, "FSTree.IterateInfo")
+	defer span.End()
+
+	return t.iterateInfo(ctx, 0, []string{t.RootPath}, handler)
+}
+
+func (t *FSTree) iterateInfo(ctx context.Context, depth uint64, curPath []string, handler IterateInfoHandler) error {
+	curName := strings.Join(curPath[1:], "")
+	dirPath := filepath.Join(curPath...)
+	entries, err := os.ReadDir(dirPath)
+	if err != nil {
+		return fmt.Errorf("read fstree dir '%s': %w", dirPath, err)
+	}
+
+	isLast := depth >= t.Depth
+	l := len(curPath)
+	curPath = append(curPath, "")
+
+	for i := range entries {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
+		curPath[l] = entries[i].Name()
+
+		if !isLast && entries[i].IsDir() {
+			err := t.iterateInfo(ctx, depth+1, curPath, handler)
+			if err != nil {
+				return err
+			}
+		}
+
+		if depth != t.Depth {
+			continue
+		}
+
+		addr, err := addressFromString(curName + entries[i].Name())
+		if err != nil {
+			continue
+		}
+		path := filepath.Join(curPath...)
+		info, err := os.Stat(path)
+		if err != nil {
+			if os.IsNotExist(err) {
+				continue
+			}
+			return err
+		}
+
+		err = handler(ObjectInfo{
+			Address:  addr,
+			DataSize: uint64(info.Size()),
+		})
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func (t *FSTree) treePath(addr oid.Address) string {
 	sAddr := stringifyAddress(addr)
 

pkg/local_object_storage/blobstor/fstree/metrics.go

@@ -13,6 +13,7 @@ type Metrics interface {
 	Close()
 
 	Iterate(d time.Duration, success bool)
+	IterateInfo(d time.Duration, success bool)
 	Delete(d time.Duration, success bool)
 	Exists(d time.Duration, success bool)
 	Put(d time.Duration, size int, success bool)
@@ -27,6 +28,7 @@ func (m *noopMetrics) SetParentID(string)                {}
 func (m *noopMetrics) SetMode(mode.ComponentMode)        {}
 func (m *noopMetrics) Close()                            {}
 func (m *noopMetrics) Iterate(time.Duration, bool)       {}
+func (m *noopMetrics) IterateInfo(time.Duration, bool)   {}
 func (m *noopMetrics) Delete(time.Duration, bool)        {}
 func (m *noopMetrics) Exists(time.Duration, bool)        {}
 func (m *noopMetrics) Put(time.Duration, int, bool)      {}

pkg/local_object_storage/metrics/fstree.go

@@ -38,6 +38,10 @@ func (m *fstreeMetrics) Iterate(d time.Duration, success bool) {
 	m.m.MethodDuration(m.shardID, m.path, "Iterate", d, success)
 }
 
+func (m *fstreeMetrics) IterateInfo(d time.Duration, success bool) {
+	m.m.MethodDuration(m.shardID, m.path, "IterateInfo", d, success)
+}
+
 func (m *fstreeMetrics) Delete(d time.Duration, success bool) {
 	m.m.MethodDuration(m.shardID, m.path, "Delete", d, success)
 }