def login_user(user, remember=None):
    """Perform the login routine.

    If SECURITY_TRACKABLE is used, make sure you commit changes after this
    request (i.e. ``app.security.datastore.commit()``).

    :param user: The user to login
    :param remember: Flag specifying if the remember cookie should be set.
                     Defaults to ``False``
    """

    if remember is None:
        remember = config_value('DEFAULT_REMEMBER_ME')

    if not _login_user(user, remember):  # pragma: no cover
        return False

    if _security.trackable:
        remote_addr = request.remote_addr or None  # make sure it is None

        old_current_login, new_current_login = (
            user.current_login_at, _security.datetime_factory()
        )
        old_current_ip, new_current_ip = user.current_login_ip, remote_addr

        user.last_login_at = old_current_login or new_current_login
        user.current_login_at = new_current_login
        user.last_login_ip = old_current_ip
        user.current_login_ip = new_current_ip
        user.login_count = user.login_count + 1 if user.login_count else 1

        _datastore.put(user)

    identity_changed.send(current_app._get_current_object(),
                          identity=Identity(user.id))
    return True
Perform the login routine.

    If SECURITY_TRACKABLE is used, make sure you commit changes after this
    request (i.e. ``app.security.datastore.commit()``).

    :param user: The user to login
    :param remember: Flag specifying if the remember cookie should be set.
                     Defaults to ``False``