70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
# Copyright (c) 2013 Rackspace Hosting, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""utils: general-purpose utilities."""
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from oslo_config import cfg
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import six
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def fields(d, names, pred=lambda x: True,
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key_transform=lambda x: x, value_transform=lambda x: x):
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"""Returns the entries in this dictionary with keys appearing in names.
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:type d: dict
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:type names: [a]
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:param pred: a filter that is applied to the values of the dictionary.
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:type pred: (a -> bool)
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:param key_transform: a transform to apply to the key before returning it
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:type key_transform: a -> a
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:param value_transform: a transform to apply to the value before
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returning it
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:type value_transform: a -> a
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:rtype: dict
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"""
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return dict((key_transform(k), value_transform(v))
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for k, v in d.items()
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if k in names and pred(v))
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_pytype_to_cfgtype = {
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six.text_type: cfg.StrOpt,
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str: cfg.StrOpt,
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int: cfg.IntOpt,
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bool: cfg.BoolOpt,
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float: cfg.FloatOpt,
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list: cfg.ListOpt,
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dict: cfg.DictOpt
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}
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def dict_to_conf(options):
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"""Converts a python dictionary to a list of oslo_config.cfg.Opt
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:param options: The python dictionary to convert
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:type options: dict
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:returns: a list of options compatible with oslo_config
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:rtype: [oslo_config.cfg.Opt]
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"""
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opts = []
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for k, v in options.items():
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opt_type = _pytype_to_cfgtype[type(v)]
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opts.append(opt_type(name=k, default=v))
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return opts
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