uncloud-mravi/ucloud/settings/__init__.py

122 lines
3.9 KiB
Python

import configparser
import logging
import sys
import os
from ucloud.common.etcd_wrapper import Etcd3Wrapper
logger = logging.getLogger(__name__)
class CustomConfigParser(configparser.RawConfigParser):
def __getitem__(self, key):
try:
result = super().__getitem__(key)
except KeyError as err:
raise KeyError(
"Key '{}' not found in configuration. Make sure you configure ucloud.".format(
key
)
) from err
else:
return result
class Settings(object):
def __init__(self, config_key="/uncloud/config/"):
conf_name = "ucloud.conf"
conf_dir = os.environ.get(
"UCLOUD_CONF_DIR", os.path.expanduser("~/ucloud/")
)
self.config_file = os.path.join(conf_dir, conf_name)
self.config_parser = CustomConfigParser(allow_no_value=True)
self.config_key = config_key
self.read_internal_values()
try:
self.config_parser.read(self.config_file)
except Exception as err:
logger.error("%s", err)
def get_etcd_client(self):
args = tuple()
try:
kwargs = {
"host": self.config_parser.get("etcd", "url"),
"port": self.config_parser.get("etcd", "port"),
"ca_cert": self.config_parser.get("etcd", "ca_cert"),
"cert_cert": self.config_parser.get(
"etcd", "cert_cert"
),
"cert_key": self.config_parser.get("etcd", "cert_key"),
}
except configparser.Error as err:
raise configparser.Error(
"{} in config file {}".format(
err.message, self.config_file
)
) from err
else:
try:
wrapper = Etcd3Wrapper(*args, **kwargs)
except Exception as err:
logger.error(
"etcd connection not successfull. Please check your config file."
"\nDetails: %s\netcd connection parameters: %s",
err,
kwargs,
)
sys.exit(1)
else:
return wrapper
def read_internal_values(self):
self.config_parser.read_dict(
{
"etcd": {
"file_prefix": "/files/",
"host_prefix": "/hosts/",
"image_prefix": "/images/",
"image_store_prefix": "/imagestore/",
"network_prefix": "/networks/",
"request_prefix": "/requests/",
"user_prefix": "/users/",
"vm_prefix": "/vms/",
}
}
)
def read_config_file_values(self, config_file):
try:
# Trying to read configuration file
with open(config_file, "r") as config_file_handle:
self.config_parser.read_file(config_file_handle)
except FileNotFoundError:
sys.exit(
"Configuration file {} not found!".format(config_file)
)
except Exception as err:
logger.exception(err)
sys.exit("Error occurred while reading configuration file")
def read_values_from_etcd(self):
etcd_client = self.get_etcd_client()
config_from_etcd = etcd_client.get(
self.config_key, value_in_json=True
)
if config_from_etcd:
self.config_parser.read_dict(config_from_etcd.value)
else:
raise KeyError(
"Key '{}' not found in etcd. Please configure ucloud.".format(
self.config_key
)
)
def __getitem__(self, key):
self.read_values_from_etcd()
return self.config_parser[key]
settings = Settings()