monthlyrotate

Go library for a file whose that rotates monthly. Modified https://github.com/kjk/dailyrotate.

Usage

pathFormat := filepath.Join("dir", "2006-01.txt")
func onClose(path string, didRotate bool) {
  fmt.Printf("we just closed a file '%s', didRotate: %v\n", path, didRotate)
  if !didRotate {
    return
  }
  // process just closed file e.g. upload to backblaze storage for backup
  go func() {
    // if processing takes a long time, do it in a background goroutine
  }()
}

w, err := monthlyrotate.NewFile(pathFormat, onClose)
panicIfErr(err)

_, err = io.WriteString(w, "hello\n")
panicIfErr(err)

err = w.Close()
panicIfErr(err)

Given that files are rotated monthly, you need to provide a file name format which will be passed to time.Now().UTC().Format() function. It should produce a unique file name each month e.g. 2006-01.log

You can also provide onClose function which will be called when the file is closed (either because of rotation or calling Close()).

You can use that to e.g. backup the just rotated file to backblaze.