def METHOD_NAME(module):
    """
    Install a Perl module from CPAN
    CLI Example:
    .. code-block:: bash
        salt '*' cpan.install Template::Alloy
    """
    ret = {
        "old": None,
        "new": None,
    }
    old_info = show(module)
    cmd = "cpan -i {}".format(module)
    out = __salt__["cmd.run"](cmd)
    if "don't know what it is" in out:
        ret["error"] = "CPAN cannot identify this package"
        return ret
    new_info = show(module)
    ret["old"] = old_info.get("installed version", None)
    ret["new"] = new_info["installed version"]
    return ret