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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
from .onap.audit import Audit
from .policy_utils import Utils
LOGS_DIR = 'logs'
try:
os.makedirs(LOGS_DIR, mode=0o770, exist_ok=True)
except Exception:
pass
logging.basicConfig(
filename=os.path.join(LOGS_DIR, '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 Settings(object):
"""settings of module or an application
that is the config filtered by the collection of config-keys.
keeps track of changes versus the previous set_config unless committed
"""
def __init__(self, *config_keys):
"""provide the collection of top level keys in config to limit the config"""
self._config_keys = config_keys
self._changed = False
self._config = None
self._prev_config = None
def __str__(self):
"""get str of the config"""
return Audit.json_dumps({
"config_keys": self._config_keys,
"changed": self._changed,
"config": self._config,
"prev_config": self._prev_config
})
def is_loaded(self):
"""whether loaded already"""
return bool(self._config)
def commit_change(self):
"""set the prev config to the latest config"""
self._prev_config = copy.deepcopy(self._config)
self._changed = False
def _set_changed(self):
"""determine whether the config changed"""
self._changed = not (self._prev_config
and Utils.are_the_same(self._prev_config, self._config,
Audit.json_dumps))
def set_config(self, config, auto_commit=False):
"""update the config"""
self.commit_change()
if isinstance(config, Settings):
config = config._config
if not isinstance(config, dict):
config = {}
self._config = copy.deepcopy(dict((k, v) for (k, v) in config.items()
if not self._config_keys or k in self._config_keys))
if auto_commit:
self.commit_change()
else:
self._set_changed()
def is_changed(self):
"""whether the config has changed"""
return self._changed
def get_by_key(self, config_key, default=None):
"""get the latest sub config by config_key and whether it has changed"""
if not config_key or not isinstance(config_key, str):
return False, default
value = copy.deepcopy(self._config.get(config_key, default))
if not self._prev_config:
return True, value
prev_value = self._prev_config.get(config_key, default)
return self._changed and not Utils.are_the_same(prev_value, value, Audit.json_dumps), value
def update(self, config_key, value=None):
"""set the latest sub config by config_key and determine whether the config has changed"""
if not config_key:
return
self._config[config_key] = copy.deepcopy(value)
self._set_changed()
class Config(object):
"""main config of the application"""
_logger = logging.getLogger("policy_handler.config")
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"
POOL_CONNECTIONS = "pool_connections"
DEPLOY_HANDLER = "deploy_handler"
THREAD_POOL_SIZE = "thread_pool_size"
POLICY_RETRY_COUNT = "policy_retry_count"
POLICY_RETRY_SLEEP = "policy_retry_sleep"
RECONFIGURE = "reconfigure"
TIMER_INTERVAL = "interval"
system_name = SERVICE_NAME_POLICY_HANDLER
wservice_port = 25577
_local_config = Settings()
discovered_config = Settings()
@staticmethod
def init_config(file_path=None):
"""read and store the config from config file"""
if Config._local_config.is_loaded():
Config._logger.info("config already inited: %s", Config._local_config)
return
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)
local_config = loaded_config.get(Config.SERVICE_NAME_POLICY_HANDLER)
Config.system_name = local_config.get(Config.FIELD_SYSTEM, Config.system_name)
Config._local_config.set_config(local_config, auto_commit=True)
Config._logger.info("config loaded from file(%s): %s", file_path, Config._local_config)
@staticmethod
def discover(audit):
"""bring and merge the config settings from the discovery service"""
discovery_key = Config.system_name
new_config = DiscoveryClient.get_value(audit, 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, Audit.json_dumps(new_config))
Config.discovered_config.set_config(new_config.get(Config.SERVICE_NAME_POLICY_HANDLER))
Config._logger.info("config from discovery: %s", Config.discovered_config)
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