Source code for keystone.conf.opts

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"""Single point of entry to generate the sample configuration file.

This module collects all the necessary info from the other modules in this
package. It is assumed that:

* Every other module in this package has a 'list_opts' function which
  returns a dict where:

  * The keys are strings which are the group names.

  * The value of each key is a list of config options for that group.

* The conf package doesn't have further packages with config options.

* This module is only used in the context of sample file generation.

"""

import collections
import importlib
import os
import pkgutil


LIST_OPTS_FUNC_NAME = 'list_opts'
IGNORED_MODULES = ('opts', 'constants', 'utils')


[docs]def list_opts(): opts = collections.defaultdict(list) module_names = _list_module_names() imported_modules = _import_modules(module_names) _append_config_options(imported_modules, opts) return _tupleize(opts)
def _tupleize(d): """Convert a dict of options to the 2-tuple format.""" return [(key, value) for key, value in d.items()] def _list_module_names(): module_names = [] package_path = os.path.dirname(os.path.abspath(__file__)) for _, module_name, ispkg in pkgutil.iter_modules(path=[package_path]): if module_name in IGNORED_MODULES or ispkg: # Skip this module. continue else: module_names.append(module_name) return module_names def _import_modules(module_names): imported_modules = [] for module_name in module_names: full_module_path = '.'.join(__name__.split('.')[:-1] + [module_name]) module = importlib.import_module(full_module_path) if not hasattr(module, LIST_OPTS_FUNC_NAME): raise Exception( "The module '%s' should have a '%s' function which " "returns the config options." % ( full_module_path, LIST_OPTS_FUNC_NAME)) else: imported_modules.append(module) return imported_modules def _process_old_opts(configs): """Convert old-style 2-tuple configs to dicts.""" if isinstance(configs, tuple): configs = [configs] return {label: options for label, options in configs} def _append_config_options(imported_modules, config_options): for module in imported_modules: configs = module.list_opts() # TODO(markus_z): Remove this compatibility shim once all list_opts() # functions have been updated to return dicts. if not isinstance(configs, dict): configs = _process_old_opts(configs) for key, val in configs.items(): config_options[key].extend(val)