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#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import collections
import importlib
import logging
import os
from stevedore import extension
from toscaparser.common.exception import ToscaExtAttributeError
from toscaparser.common.exception import ToscaExtImportError
log = logging.getLogger("tosca.model")
REQUIRED_ATTRIBUTES = ['VERSION', 'DEFS_FILE']
class ExtTools(object):
def __init__(self):
self.EXTENSION_INFO = self._load_extensions()
def _load_extensions(self):
'''Dynamically load all the extensions .'''
extensions = collections.OrderedDict()
extns = extension.ExtensionManager(namespace='toscaparser.extensions',
invoke_on_load=True).extensions
for e in extns:
try:
extinfo = importlib.import_module(e.plugin.__module__)
base_path = os.path.dirname(extinfo.__file__)
version = e.plugin().VERSION
defs_file = base_path + '/' + e.plugin().DEFS_FILE
# Sections is an optional attribute
sections = getattr(e.plugin(), 'SECTIONS', ())
extensions[version] = {'sections': sections,
'defs_file': defs_file}
except ImportError:
raise ToscaExtImportError(ext_name=e.name)
except AttributeError:
attrs = ', '.join(REQUIRED_ATTRIBUTES)
raise ToscaExtAttributeError(ext_name=e.name, attrs=attrs)
return extensions
def get_versions(self):
return sorted(self.EXTENSION_INFO.keys())
def get_sections(self):
sections = {}
for version in self.EXTENSION_INFO.keys():
sections[version] = self.EXTENSION_INFO[version]['sections']
return sections
def get_defs_file(self, version):
versiondata = self.EXTENSION_INFO.get(version)
if versiondata:
return versiondata.get('defs_file')
else:
return None
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