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package lru
import (
// FileObject is a simple struct that tracks data
type FileObject struct {
Size int
Time time.Time
Path string
index int
// NewFile constructs a FileObject from its pathname and an
// os.FileInfo object. If the object is a directory, this method does
// not sum the total size of the directory.
func NewFile(fn string, info os.FileInfo) *FileObject {
return &FileObject{
Path: fn,
Time: info.ModTime(),
Size: int(info.Size()),
// Update refreshs the objects data, and sums the total size of all
// objects in a directory if the object refers to a directory.
func (f *FileObject) Update() error {
stat, err := os.Stat(f.Path)
if os.IsNotExist(err) {
return errors.Errorf("file %s no longer exists", f.Path)
f.Time = stat.ModTime()
if stat.IsDir() {
size, err := dirSize(f.Path)
if err != nil {
return errors.Wrapf(err, "problem finding size of directory %d", f.Path)
f.Size = int(size)
} else {
f.Size = int(stat.Size())
return nil
// Remove deletes the file object, recursively if necessary.
func (f *FileObject) Remove() error {
return os.RemoveAll(f.Path)
func dirSize(path string) (int64, error) {
var size int64
err := filepath.Walk(path, func(_ string, info os.FileInfo, err error) error {
if err != nil {
return err
if !info.IsDir() {
size += info.Size()
return nil
if err != nil {
return 0, errors.Wrapf(err, "problem getting size of %s", path)
return size, nil