forked from uncloud/uncloud
128 lines
4.3 KiB
Python
128 lines
4.3 KiB
Python
import configparser
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import logging
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import sys
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import os
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from datetime import datetime
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from uncloud.common.etcd_wrapper import Etcd3Wrapper
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logger = logging.getLogger(__name__)
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class CustomConfigParser(configparser.RawConfigParser):
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def __getitem__(self, key):
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try:
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result = super().__getitem__(key)
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except KeyError as err:
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raise KeyError(
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'Key \'{}\' not found in configuration. Make sure you configure uncloud.'.format(
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key
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)
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) from err
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else:
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return result
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class Settings(object):
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def __init__(self, config_key='/uncloud/config/'):
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conf_name = 'uncloud.conf'
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conf_dir = os.environ.get(
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'UCLOUD_CONF_DIR', os.path.expanduser('~/uncloud/')
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)
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self.config_file = os.path.join(conf_dir, conf_name)
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self.config_parser = CustomConfigParser(allow_no_value=True)
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self.config_key = config_key
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# this is used to cache config from etcd for 1 minutes. Without this we
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# would make a lot of requests to etcd which slows down everything.
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self.last_config_update = datetime.fromtimestamp(0)
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self.read_internal_values()
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try:
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self.config_parser.read(self.config_file)
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except Exception as err:
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logger.error('%s', err)
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def get_etcd_client(self):
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args = tuple()
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try:
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kwargs = {
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'host': self.config_parser.get('etcd', 'url'),
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'port': self.config_parser.get('etcd', 'port'),
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'ca_cert': self.config_parser.get('etcd', 'ca_cert'),
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'cert_cert': self.config_parser.get('etcd', 'cert_cert'),
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'cert_key': self.config_parser.get('etcd', 'cert_key'),
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}
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except configparser.Error as err:
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raise configparser.Error(
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'{} in config file {}'.format(
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err.message, self.config_file
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)
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) from err
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else:
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try:
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wrapper = Etcd3Wrapper(*args, **kwargs)
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except Exception as err:
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logger.error(
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'etcd connection not successfull. Please check your config file.'
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'\nDetails: %s\netcd connection parameters: %s',
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err,
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kwargs,
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)
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sys.exit(1)
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else:
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return wrapper
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def read_internal_values(self):
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self.config_parser.read_dict(
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{
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'etcd': {
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'file_prefix': '/files/',
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'host_prefix': '/hosts/',
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'image_prefix': '/images/',
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'image_store_prefix': '/imagestore/',
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'network_prefix': '/networks/',
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'request_prefix': '/requests/',
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'user_prefix': '/users/',
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'vm_prefix': '/vms/',
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}
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}
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)
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def read_config_file_values(self, config_file):
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try:
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# Trying to read configuration file
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with open(config_file, 'r') as config_file_handle:
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self.config_parser.read_file(config_file_handle)
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except FileNotFoundError:
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sys.exit(
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'Configuration file {} not found!'.format(config_file)
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)
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except Exception as err:
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logger.exception(err)
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sys.exit('Error occurred while reading configuration file')
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def read_values_from_etcd(self):
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etcd_client = self.get_etcd_client()
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if (datetime.utcnow() - self.last_config_update).total_seconds() > 60:
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config_from_etcd = etcd_client.get(self.config_key, value_in_json=True)
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if config_from_etcd:
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self.config_parser.read_dict(config_from_etcd.value)
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self.last_config_update = datetime.utcnow()
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else:
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raise KeyError('Key \'{}\' not found in etcd. Please configure uncloud.'.format(self.config_key))
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def __getitem__(self, key):
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# Allow failing to read from etcd if we have
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# it locally
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if key not in self.config_parser.sections():
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try:
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self.read_values_from_etcd()
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except KeyError:
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pass
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return self.config_parser[key]
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settings = Settings()
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