Source code for keystone.conf.opts
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# http://www.apache.org/licenses/LICENSE-2.0
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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 _append_config_options(imported_modules, config_options):
for module in imported_modules:
configs = module.list_opts()
for key, val in configs.items():
config_options[key].extend(val)