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# Copyright 2017-present Open Networking Foundation
#
# 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.
from resources import RESOURCES
class GRPCModelsAccessor:
"""
This class provide the glue between the models managed by TOSCA and the ones living in xos-core
"""
@staticmethod
def get_model_from_classname(class_name, data, username, password):
"""
Give a Model Class Name and some data, check if that exits or instantiate a new one
"""
# NOTE: we need to import this later as it's generated by main.py
from KEYS import TOSCA_KEYS
# get the key for this model
try:
filter_keys = TOSCA_KEYS[class_name]
except KeyError, e:
raise Exception("[XOS-TOSCA] Model %s doesn't have a tosca_key specified" % (class_name))
if len(filter_keys) == 0:
raise Exception("[XOS-TOSCA] Model %s doesn't have a tosca_key specified" % (class_name))
filter = {}
for k in filter_keys:
if isinstance(k, str):
try:
filter[k] = data[k]
except KeyError, e:
raise Exception("[XOS-TOSCA] Model %s doesn't have a property for the specified tosca_key (%s)" % (class_name, e))
elif isinstance(k, list):
# one of they keys in this list has to be set
one_of_key = None
for i in k:
if i in data:
one_of_key = i
one_of_key_val = data[i]
if not one_of_key:
raise Exception("[XOS-TOSCA] Model %s doesn't have a property for the specified tosca_key_one_of (%s)" % (class_name, k))
else:
filter[one_of_key] = one_of_key_val
key = "%s~%s" % (username, password)
if not key in RESOURCES:
raise Exception("[XOS-TOSCA] User '%s' does not have ready resources" % username)
if class_name not in RESOURCES[key]:
raise Exception('[XOS-TOSCA] The model you are trying to create (class: %s, properties, %s) is not know by xos-core' % (class_name, str(filter)))
cls = RESOURCES[key][class_name]
models = cls.objects.filter(**filter)
if len(models) == 1:
print "[XOS-Tosca] Model of class %s and properties %s already exist, retrieving instance..." % (class_name, str(filter))
model = models[0]
elif len(models) == 0:
if 'must-exist' in data and data['must-exist']:
raise Exception("[XOS-TOSCA] Model of class %s and properties %s has property 'must-exist' but cannot be found" % (class_name, str(filter)))
model = cls.objects.new()
print "[XOS-Tosca] Model (%s) is new, creating new instance..." % str(filter)
else:
raise Exception("[XOS-Tosca] Model of class %s and properties %s has multiple instances, I can't handle it" % (class_name, str(filter)))
return model