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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# 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 copy
import inspect
import logging
import pkgutil
import traceback
from netmodel.model.type import Type
from netmodel.util.singleton import Singleton
log = logging.getLogger(__name__)
# Blacklist : resource that are temporarily disabled loaded
RESOURCE_BLACKLIST = ['LinuxBridge']
class ResourceFactory(metaclass=Singleton):
"""
This manages classes, not instances
"""
def __init__(self):
self._registry = dict()
self._register_all()
def _register_all(self):
log.info("Registering resources")
from vicn.core.resource import Resource
from vicn import resource as package
prefix = package.__name__ + "."
# Because aggregates might not be instanciated in order, we accumulate
# them and register them at the end
delayed_aggregates = dict()
# Explored modules are automatically imported by walk_modules + it
# allows to explore recursively resources/
# http://docs.python.org/2/library/pkgutil.html
for importer, modname, ispkg in pkgutil.walk_packages(package.__path__,
prefix, onerror = None):
try:
module = __import__(modname, fromlist = "dummy")
classes = [m[1] for m in inspect.getmembers(module,
inspect.isclass) if m[1].__module__ == modname]
for cls in classes:
if not issubclass(cls, Resource):
continue
if cls.__name__ in RESOURCE_BLACKLIST:
print('Skipped blacklisted resource ' + cls.__name__)
continue
# Register module to resource factory
self._registry[cls.__qualname__] = cls
Type._registry[cls.__qualname__.lower()] = cls
except Exception as e:
log.warning("Cannot load %s : %s: %s" % (modname, e,
traceback.format_exc()))
log.info("Registered resources are: {%s}" % ", ".join(sorted(
self._registry.keys())))
def get_available_resources(self):
return self._registry
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