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# org.onap.dcae
# ================================================================================
# Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# 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.
# ============LICENSE_END=========================================================
#
# ECOMP is a trademark and service mark of AT&T Intellectual Property.
"""policy-client communicates with policy-engine thru REST API"""
import logging
import json
import re
from .policy_consts import POLICY_ID, POLICY_VERSION, POLICY_NAME, POLICY_BODY, POLICY_CONFIG
class PolicyUtils(object):
"""policy-client utils"""
_logger = logging.getLogger("policy_handler.policy_utils")
_policy_name_ext = re.compile('[.][0-9]+[.][a-zA-Z]+$')
@staticmethod
def safe_json_parse(json_str):
"""try parsing json without exception - returns the json_str back if fails"""
if not json_str:
return json_str
try:
return json.loads(json_str)
except (ValueError, TypeError) as err:
PolicyUtils._logger.warn("unexpected json %s: %s", str(json_str), str(err))
return json_str
@staticmethod
def extract_policy_id(policy_name):
""" policy_name = policy_id + "." + <version> + "." + <extension>
For instance,
policy_name = DCAE_alex.Config_alex_policy_number_1.3.xml
policy_id = DCAE_alex.Config_alex_policy_number_1
policy_scope = DCAE_alex
policy_class = Config
policy_version = 3
type = extension = xml
delimiter = "."
policy_class_delimiter = "_"
policy_name in PAP = DCAE_alex.alex_policy_number_1
"""
if not policy_name:
return
return PolicyUtils._policy_name_ext.sub('', policy_name)
@staticmethod
def parse_policy_config(policy):
"""try parsing the config in policy."""
if not policy:
return policy
config = policy.get(POLICY_BODY, {}).get(POLICY_CONFIG)
if config:
policy[POLICY_BODY][POLICY_CONFIG] = PolicyUtils.safe_json_parse(config)
return policy
@staticmethod
def convert_to_policy(policy_config):
"""wrap policy_config received from policy-engine with policy_id."""
if not policy_config:
return
policy_name = policy_config.get(POLICY_NAME)
policy_version = policy_config.get(POLICY_VERSION)
if not policy_name or not policy_version:
return
policy_id = PolicyUtils.extract_policy_id(policy_name)
if not policy_id:
return
return {POLICY_ID:policy_id, POLICY_BODY:policy_config}
@staticmethod
def select_latest_policy(policy_configs, min_version_expected=None, ignore_policy_names=None):
"""For some reason, the policy-engine returns all version of the policy_configs.
DCAE-Controller is only interested in the latest version
"""
if not policy_configs:
return
latest_policy_config = {}
for policy_config in policy_configs:
policy_name = policy_config.get(POLICY_NAME)
policy_version = policy_config.get(POLICY_VERSION)
if not policy_name or not policy_version or not policy_version.isdigit():
continue
policy_version = int(policy_version)
if min_version_expected and policy_version < min_version_expected:
continue
if ignore_policy_names and policy_name in ignore_policy_names:
continue
if not latest_policy_config \
or int(latest_policy_config[POLICY_VERSION]) < policy_version:
latest_policy_config = policy_config
return PolicyUtils.parse_policy_config(PolicyUtils.convert_to_policy(latest_policy_config))
@staticmethod
def select_latest_policies(policy_configs):
"""For some reason, the policy-engine returns all version of the policy_configs.
DCAE-Controller is only interested in the latest versions
"""
if not policy_configs:
return {}
policies = {}
for policy_config in policy_configs:
policy = PolicyUtils.convert_to_policy(policy_config)
if not policy:
continue
policy_id = policy.get(POLICY_ID)
policy_version = policy.get(POLICY_BODY, {}).get(POLICY_VERSION)
if not policy_id or not policy_version or not policy_version.isdigit():
continue
if policy_id not in policies \
or int(policy_version) > int(policies[policy_id][POLICY_BODY][POLICY_VERSION]):
policies[policy_id] = policy
for policy_id in policies:
policies[policy_id] = PolicyUtils.parse_policy_config(policies[policy_id])
return policies
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