How to check if a file is a valid boltdb database without panicing

[korjavin]

    d1 := []byte("hello\n")
    ioutil.WriteFile(filename, d1, 0644)

  dbconn, err := bolt.Open(filename, os.ModePerm, &bolt.Options{Timeout: 1 * time.Second})
    defer dbconn.Close()

This one will panic, but I would like to have just an err like "wrong format"

[xyproto]

You can recover from the panic with recover(), like this:

func canOpenDB(filename string) (retval bool) {
	defer func() {
		retval = nil == recover()
	}()
	dbconn, err := bolt.Open(filename, os.ModePerm, &bolt.Options{Timeout: 1 * time.Second})
	defer dbconn.Close()
        return nil == err
}

[korjavin]

It may work, thank you!