46f511a8c8
In this changeset, I implemented the main logic although this is mainly a shameful copy/paste of Nova's blueprint https://blueprints.launchpad.net/nova/+spec/centralize-config-options Partially Implements: blueprint centralise-config-opts Change-Id: Ib645ad5da5c706336bb6ac37e85b027d05665c32
96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
# Copyright 2016 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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This is the single point of entry to generate the sample configuration
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file for Watcher. It collects all the necessary info from the other modules
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in this package. It is assumed that:
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* every other module in this package has a 'list_opts' function which
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return a dict where
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* the keys are strings which are the group names
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* the value of each key is a list of config options for that group
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* the watcher.conf package doesn't have further packages with config options
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* this module is only used in the context of sample file generation
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"""
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import collections
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import importlib
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import os
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import pkgutil
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LIST_OPTS_FUNC_NAME = "list_opts"
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def _tupleize(dct):
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"""Take the dict of options and convert to the 2-tuple format."""
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return [(key, val) for key, val in dct.items()]
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def list_opts():
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"""Grouped list of all the Watcher-specific configuration options
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:return: A list of ``(group, [opt_1, opt_2])`` tuple pairs, where ``group``
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is either a group name as a string or an OptGroup object.
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"""
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opts = collections.defaultdict(list)
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module_names = _list_module_names()
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imported_modules = _import_modules(module_names)
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_append_config_options(imported_modules, opts)
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return _tupleize(opts)
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def _list_module_names():
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module_names = []
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package_path = os.path.dirname(os.path.abspath(__file__))
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for __, modname, ispkg in pkgutil.iter_modules(path=[package_path]):
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if modname == "opts" or ispkg:
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continue
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else:
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module_names.append(modname)
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return module_names
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def _import_modules(module_names):
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imported_modules = []
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for modname in module_names:
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mod = importlib.import_module("watcher.conf." + modname)
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if not hasattr(mod, LIST_OPTS_FUNC_NAME):
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msg = "The module 'watcher.conf.%s' should have a '%s' "\
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"function which returns the config options." % \
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(modname, LIST_OPTS_FUNC_NAME)
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raise Exception(msg)
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else:
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imported_modules.append(mod)
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return imported_modules
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def _process_old_opts(configs):
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"""Convert old-style 2-tuple configs to dicts."""
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if isinstance(configs, tuple):
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configs = [configs]
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return {label: options for label, options in configs}
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def _append_config_options(imported_modules, config_options):
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for mod in imported_modules:
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configs = mod.list_opts()
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# TODO(markus_z): Remove this compatibility shim once all list_opts()
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# functions have been updated to return dicts.
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if not isinstance(configs, dict):
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configs = _process_old_opts(configs)
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for key, val in configs.items():
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config_options[key].extend(val)
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