de252f95fe
This changes the TOSCA Parser extensions implementation to use a stevedore Extensions namespace (toscaparser.extensions) to allow TOSCA schema extensions to be loaded from other sources without requiring them to be included in the tosca-parser repository. Change-Id: Ia4d9430c398b2911043047d843419ff6edebfe3f
77 lines
2.5 KiB
Python
77 lines
2.5 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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import collections
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import importlib
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import logging
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import os
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from stevedore import extension
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from toscaparser.common.exception import ToscaExtAttributeError
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from toscaparser.common.exception import ToscaExtImportError
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log = logging.getLogger("tosca.model")
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REQUIRED_ATTRIBUTES = ['VERSION', 'DEFS_FILE']
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class ExtTools(object):
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def __init__(self):
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self.EXTENSION_INFO = self._load_extensions()
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def _load_extensions(self):
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'''Dynamically load all the extensions .'''
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extensions = collections.OrderedDict()
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extns = extension.ExtensionManager(namespace='toscaparser.extensions',
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invoke_on_load=True).extensions
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for e in extns:
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try:
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extinfo = importlib.import_module(e.plugin.__module__)
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base_path = os.path.dirname(extinfo.__file__)
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version = e.plugin().VERSION
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defs_file = base_path + '/' + e.plugin().DEFS_FILE
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# Sections is an optional attribute
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sections = getattr(e.plugin(), 'SECTIONS', ())
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extensions[version] = {'sections': sections,
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'defs_file': defs_file}
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except ImportError:
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raise ToscaExtImportError(ext_name=e.name)
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except AttributeError:
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attrs = ', '.join(REQUIRED_ATTRIBUTES)
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raise ToscaExtAttributeError(ext_name=e.name, attrs=attrs)
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return extensions
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def get_versions(self):
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return sorted(self.EXTENSION_INFO.keys())
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def get_sections(self):
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sections = {}
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for version in self.EXTENSION_INFO.keys():
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sections[version] = self.EXTENSION_INFO[version]['sections']
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return sections
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def get_defs_file(self, version):
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versiondata = self.EXTENSION_INFO.get(version)
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if versiondata:
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return versiondata.get('defs_file')
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else:
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return None
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