walkDir calls f on all the cache files in the given dir.
(dir string, f func(fi os.FileInfo))
| 8 | |
| 9 | // walkDir calls f on all the cache files in the given dir. |
| 10 | func walkDir(dir string, f func(fi os.FileInfo)) error { |
| 11 | // Do not use filepath.Walk, since it is inefficient |
| 12 | // for large number of files. |
| 13 | // See https://golang.org/pkg/path/filepath/#Walk . |
| 14 | fd, err := os.Open(dir) |
| 15 | if err != nil { |
| 16 | return fmt.Errorf("cannot open %q: %w", dir, err) |
| 17 | } |
| 18 | defer fd.Close() |
| 19 | |
| 20 | for { |
| 21 | fis, err := fd.Readdir(1024) |
| 22 | if err != nil { |
| 23 | if err == io.EOF { |
| 24 | return nil |
| 25 | } |
| 26 | return fmt.Errorf("cannot read files in %q: %w", dir, err) |
| 27 | } |
| 28 | for _, fi := range fis { |
| 29 | if fi.IsDir() { |
| 30 | // Skip subdirectories |
| 31 | continue |
| 32 | } |
| 33 | fn := fi.Name() |
| 34 | if !cachefileRegexp.MatchString(fn) { |
| 35 | // Skip invalid filenames |
| 36 | continue |
| 37 | } |
| 38 | f(fi) |
| 39 | } |
| 40 | } |
| 41 | } |