Flexible datastore options. PoC.

gistfile1.py

path = "datastores"
ENV = jinja2.Environment(loader=jinja2.ChoiceLoader([
    jinja2.FileSystemLoader(os.path.join(os.getcwd(), path)),
    # jinja2.PackageLoader("online-oslo-parser", "datastores")
]))
CONF = cfg.CONF


def create_config_group(name):
    reg = cfg.OptGroup(name, title='%s options' % name,
                       help="Oslo option group designed "
                            "for %s datastore" % name)
    CONF.register_group(reg)
    return reg


def build_list_opts_for(conf_group, opts):
    list_group = []
    for opt_key, opt_values in opts.iteritems():
        list_group.append(
            cfg.ListOpt(opt_key, default=opt_values["default"],
                        help=opt_values["help"]))
    if list_group:
        CONF.register_opts(list_group, conf_group)


def build_dict_opts_for(conf_group, opts):
    dict_group = []
    for opt_key, opt_values in opts.iteritems():
        dict_group.append(
            cfg.DictOpt(opt_key, default=opt_values["default"],
                        help=opt_values["help"]))
    if dict_group:
        CONF.register_opts(dict_group, conf_group)


def build_string_opts_for(conf_group, opts):
    string_group = []
    for opt_key, opt_values in opts.iteritems():
        string_group.append(
            cfg.StrOpt(opt_key, default=opt_values["default"],
                       help=opt_values["help"]))
    if string_group:
        CONF.register_opts(string_group, conf_group)


def build_int_opts_for(conf_group, opts):
    int_group = []
    for opt_key, opt_values in opts.iteritems():
        int_group.append(
            cfg.IntOpt(opt_key, default=opt_values["default"],
                       help=opt_values["help"]))
    if int_group:
        CONF.register_opts(int_group, conf_group)


def build_boolean_opts_for(conf_group, opts):
    bool_group = []
    for opt_key, opt_values in opts.iteritems():
        bool_group.append(
            cfg.BoolOpt(opt_key, default=opt_values["default"],
                        help=opt_values["help"]))
    if bool_group:
        CONF.register_opts(bool_group, conf_group)


if "__main__" == __name__:
    datastore_tmplts = []
    list_opts = []
    group = None
    for template in ENV.list_templates():
        options = json.loads(ENV.get_template(template).render())
        group = create_config_group(template[:-5])
        build_list_opts_for(group, options.get("list_options", {}))
        build_string_opts_for(group, options.get("string_options", {}))
        build_dict_opts_for(group, options.get("dict_options", {}))
        build_boolean_opts_for(group, options.get("boolean_options", {}))