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# ================================================================================
# Copyright (c) 2017-2018 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.
"""read and use the config"""
import copy
import json
import logging
import logging.config
import os
from .discovery import DiscoveryClient
logging.basicConfig(
filename='logs/policy_handler.log', \
format='%(asctime)s.%(msecs)03d %(levelname)+8s ' + \
'%(threadName)s %(name)s.%(funcName)s: %(message)s', \
datefmt='%Y%m%d_%H%M%S', level=logging.DEBUG)
class Config(object):
"""main config of the application"""
CONFIG_FILE_PATH = "etc/config.json"
LOGGER_CONFIG_FILE_PATH = "etc/common_logger.config"
SERVICE_NAME_POLICY_HANDLER = "policy_handler"
FIELD_SYSTEM = "system"
FIELD_WSERVICE_PORT = "wservice_port"
FIELD_POLICY_ENGINE = "policy_engine"
wservice_port = 25577
_logger = logging.getLogger("policy_handler.config")
config = None
@staticmethod
def merge(new_config):
"""merge the new_config into current config - override the values"""
if not new_config:
return
if not Config.config:
Config.config = new_config
return
new_config = copy.deepcopy(new_config)
Config.config.update(new_config)
@staticmethod
def get_system_name():
"""find the name of the policy-handler system
to be used as the key in consul-kv for config of policy-handler
"""
return (Config.config or {}).get(Config.FIELD_SYSTEM, Config.SERVICE_NAME_POLICY_HANDLER)
@staticmethod
def discover():
"""bring and merge the config settings from the discovery service"""
discovery_key = Config.get_system_name()
new_config = DiscoveryClient.get_value(discovery_key)
if not new_config or not isinstance(new_config, dict):
Config._logger.warning("unexpected config from discovery: %s", new_config)
return
Config._logger.debug("loaded config from discovery(%s): %s", \
discovery_key, json.dumps(new_config))
Config._logger.debug("config before merge from discovery: %s", json.dumps(Config.config))
Config.merge(new_config.get(Config.SERVICE_NAME_POLICY_HANDLER))
Config._logger.info("merged config from discovery: %s", json.dumps(Config.config))
@staticmethod
def load_from_file(file_path=None):
"""read and store the config from config file"""
if not file_path:
file_path = Config.CONFIG_FILE_PATH
loaded_config = None
if os.access(file_path, os.R_OK):
with open(file_path, 'r') as config_json:
loaded_config = json.load(config_json)
if not loaded_config:
Config._logger.warning("config not loaded from file: %s", file_path)
return
Config._logger.info("config loaded from file: %s", file_path)
logging_config = loaded_config.get("logging")
if logging_config:
logging.config.dictConfig(logging_config)
Config.wservice_port = loaded_config.get(Config.FIELD_WSERVICE_PORT, Config.wservice_port)
Config.merge(loaded_config.get(Config.SERVICE_NAME_POLICY_HANDLER))
Config._logger.info("config loaded from file: %s", json.dumps(Config.config))
return True
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