How to use the funcx.sdk.config.lookup_option function in funcx

"""
    Make a RefreshTokenAuthorizer given the tokens stored on disk

    Returns:
        (RefreshTokenAuthorizer): Tool to generate authorization credentials
    """

    if not check_logged_in():
        safeprint("No authorization credentials present. You must log in")
        do_login_flow()

    # Get the authorization client
    auth_client = internal_auth_client()

    # Get the tokens needed by the service
    rf_token = lookup_option(FUNCX_RT_OPTNAME)
    at_token = lookup_option(FUNCX_AT_OPTNAME)
    at_expires = int(lookup_option(FUNCX_AT_EXPIRES_OPTNAME))
    authorizer = RefreshTokenAuthorizer(rf_token, auth_client, access_token=at_token,
                                        expires_at=at_expires)

    return authorizer

def _revoke_current_tokens(native_client):
    """
    Revoke the tokens associated with a particular scope

    Args:
         native_client (NativeAppAuthClient): Authorization client for scope to be cleared
    """
    for token_opt in (FUNCX_RT_OPTNAME, FUNCX_AT_OPTNAME):
        token = lookup_option(token_opt)
        if token:
            native_client.oauth2_revoke_token(token)

Make a RefreshTokenAuthorizer given the tokens stored on disk

    Returns:
        (RefreshTokenAuthorizer): Tool to generate authorization credentials
    """

    if not check_logged_in():
        safeprint("No authorization credentials present. You must log in")
        do_login_flow()

    # Get the authorization client
    auth_client = internal_auth_client()

    # Get the tokens needed by the service
    rf_token = lookup_option(FUNCX_RT_OPTNAME)
    at_token = lookup_option(FUNCX_AT_OPTNAME)
    at_expires = int(lookup_option(FUNCX_AT_EXPIRES_OPTNAME))
    authorizer = RefreshTokenAuthorizer(rf_token, auth_client, access_token=at_token,
                                        expires_at=at_expires)

    return authorizer

Returns:
        (RefreshTokenAuthorizer): Tool to generate authorization credentials
    """

    if not check_logged_in():
        safeprint("No authorization credentials present. You must log in")
        do_login_flow()

    # Get the authorization client
    auth_client = internal_auth_client()

    # Get the tokens needed by the service
    rf_token = lookup_option(FUNCX_RT_OPTNAME)
    at_token = lookup_option(FUNCX_AT_OPTNAME)
    at_expires = int(lookup_option(FUNCX_AT_EXPIRES_OPTNAME))
    authorizer = RefreshTokenAuthorizer(rf_token, auth_client, access_token=at_token,
                                        expires_at=at_expires)

    return authorizer

def logout():
    """
    Remove Globus credentials from configuration file and revokes their authorization
    """

    native_client = internal_auth_client()

    # remove tokens from config and revoke them
    # also, track whether or not we should print the rescind help
    for token_opt in (FUNCX_RT_OPTNAME, FUNCX_AT_OPTNAME):
        # first lookup the token -- if not found we'll continue
        token = lookup_option(token_opt)
        if not token:
            safeprint(('Warning: Found no token named "{}"! '
                       'Recommend rescinding consent').format(token_opt))
            continue
        # token was found, so try to revoke it
        try:
            native_client.oauth2_revoke_token(token)
        # if we network error, revocation failed -- print message and abort so
        # that we can revoke later when the network is working
        except globus_sdk.NetworkError:
            safeprint(('Failed to reach Globus to revoke tokens. '
                       'Because we cannot revoke these tokens, cancelling '
                       'logout'))
            return
        # finally, we revoked, so it's safe to remove the token
        remove_option(token_opt)