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# ================================================================================
# Copyright (c) 2019-2020 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=========================================================
"""read and use the config"""
import copy
import json
import logging
import logging.config
import os
from otihandler.consul_client import ConsulClient
logging.basicConfig(
filename='logs/oti_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 = "oti_handler"
FIELD_SYSTEM = "system"
FIELD_WSERVICE_PORT = "wservice_port"
FIELD_TLS = "tls"
_logger = logging.getLogger("oti_handler.config")
config = None
cloudify_proto = None
cloudify_addr = None
cloudify_port = None
cloudify_user = None
cloudify_pass = None
cloudify = None
consul_url = "http://consul:8500"
tls_cacert_file = None
tls_server_cert_file = None
tls_private_key_file = None
tls_server_ca_chain_file = None
wservice_port = 9443
@staticmethod
def _get_tls_file_path(tls_config, cert_directory, tls_name):
"""calc file path and verify its existance"""
file_name = tls_config.get(tls_name)
if not file_name:
return None
tls_file_path = os.path.join(cert_directory, file_name)
if not os.path.isfile(tls_file_path) or not os.access(tls_file_path, os.R_OK):
Config._logger.error("invalid %s: %s", tls_name, tls_file_path)
return None
return tls_file_path
@staticmethod
def _set_tls_config(tls_config):
"""verify and set tls certs in config"""
try:
Config.tls_cacert_file = None
Config.tls_server_cert_file = None
Config.tls_private_key_file = None
Config.tls_server_ca_chain_file = None
if not (tls_config and isinstance(tls_config, dict)):
Config._logger.info("no tls in config: %s", json.dumps(tls_config))
return
cert_directory = tls_config.get("cert_directory")
if not (cert_directory and isinstance(cert_directory, str)):
Config._logger.warning("unexpected tls.cert_directory: %r", cert_directory)
return
cert_directory = os.path.join(
os.path.dirname(os.path.dirname(os.path.realpath(__file__))), str(cert_directory))
if not (cert_directory and os.path.isdir(cert_directory)):
Config._logger.warning("ignoring invalid cert_directory: %s", cert_directory)
return
Config.tls_cacert_file = Config._get_tls_file_path(tls_config, cert_directory, "cacert")
Config.tls_server_cert_file = Config._get_tls_file_path(tls_config, cert_directory,
"server_cert")
Config.tls_private_key_file = Config._get_tls_file_path(tls_config, cert_directory,
"private_key")
Config.tls_server_ca_chain_file = Config._get_tls_file_path(tls_config, cert_directory,
"server_ca_chain")
finally:
Config._logger.info("tls_cacert_file = %s", Config.tls_cacert_file)
Config._logger.info("tls_server_cert_file = %s", Config.tls_server_cert_file)
Config._logger.info("tls_private_key_file = %s", Config.tls_private_key_file)
Config._logger.info("tls_server_ca_chain_file = %s", Config.tls_server_ca_chain_file)
@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 oti_handler system
to be used as the key in consul-kv for config of oti_handler
"""
return (Config.config or {}).get(Config.FIELD_SYSTEM, Config.SERVICE_NAME)
@staticmethod
def discover():
"""bring and merge the config settings from Consul"""
system_key = Config.get_system_name()
new_config = ConsulClient.get_value(system_key)
if not new_config or not isinstance(new_config, dict):
Config._logger.warn("unexpected config from Consul: %s", new_config)
return
Config._logger.debug("loaded config from Consul(%s): %s",
system_key, json.dumps(new_config))
Config._logger.debug("config before merge from Consul: %s", json.dumps(Config.config))
Config.merge(new_config.get(Config.SERVICE_NAME))
Config._logger.debug("merged config from Consul: %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.info("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, {})
Config._set_tls_config(local_config.get(Config.FIELD_TLS))
Config.merge(loaded_config.get(Config.SERVICE_NAME))
return True
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