3f98139a7e
Tosca types need to be mapped to corresponding target translation types (i.e. HOT). This commit allows for the target types to be dynamically loaded from a directory. It allows for more flexibility by pulling types from a known directory instead of defining each individiual type statically in the code. For example, with this commit you no longer need a separate import for each target type. Also, this commit adds the notion of a global configuration object that can be shared throughout the translator. The configuration defines the location directory for custom defined target types. This configuration can be set by the user in the corresponding translator/conf/translator.conf file. In the future, additional values can be added to this configuration and the code can be extended to support them, but only the required values were implemented here. Change-Id: If7b8da12eef5b8ed8a2e11b1f412203d4ed59c5a Implements: blueprint dynamic-tosca-to-hot-map
68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
#
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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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''' Provide a global configuration for the TOSCA translator'''
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from six.moves import configparser
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from toscaparser.utils.gettextutils import _
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import translator.common.exception as exception
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class ConfigProvider(object):
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'''Global config proxy that wraps a ConfigParser object.
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Allows for class based access to config values. Should only be initialized
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once using the corresponding translator.conf file in the conf directory.
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'''
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# List that captures all of the conf file sections.
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# Append any new sections to this list.
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_sections = ['DEFAULT']
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_translator_config = None
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@classmethod
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def _load_config(cls, conf_file):
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'''Private method only to be called once from the __init__ module'''
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cls._translator_config = configparser.ConfigParser()
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try:
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cls._translator_config.read(conf_file)
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except configparser.ParsingError:
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msg = _('Unable to parse translator.conf file.'
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'Check to see that it exists in the conf directory.')
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raise exception.ConfFileParseError(message=msg)
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@classmethod
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def get_value(cls, section, key):
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try:
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value = cls._translator_config.get(section, key)
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except configparser.NoOptionError:
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raise exception.ConfOptionNotDefined(key=key, section=section)
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except configparser.NoSectionError:
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raise exception.ConfSectionNotDefined(section=section)
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return value
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@classmethod
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def get_all_values(cls):
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values = []
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for section in cls._sections:
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try:
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values.extend(cls._translator_config.items(section=section))
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except configparser.NoOptionError:
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raise exception.ConfSectionNotDefined(section=section)
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return values
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