let randstr(length) = do
    let chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    let id = ""
    for (i from 0 to length) do
        id += chars[random.int(0, chars.length-1)]
    return id