Source code for prestoadmin.node

# -*- coding: utf-8 -*-
#
# 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
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"""
Module for the presto coordinator's configuration.
Loads and validates the coordinator.json file and creates the files needed
to deploy on the presto cluster
"""
from abc import abstractmethod, ABCMeta
import logging
import os

import config
import presto_conf
from prestoadmin.presto_conf import get_presto_conf

_LOGGER = logging.getLogger(__name__)


[docs]class Node(): __metaclass__ = ABCMeta def __init__(self): pass
[docs] def get_conf(self): conf = get_presto_conf(self._get_conf_dir()) for name in presto_conf.REQUIRED_FILES: if name not in conf: _LOGGER.debug('%s configuration for %s not found. ' 'Default configuration will be deployed', type(self).__name__, name) conf_value = self.default_config(name) conf[name] = conf_value file_path = os.path.join(self._get_conf_dir(), name) config.write_conf_to_file(conf_value, file_path) self.validate(conf) return conf
@abstractmethod def _get_conf_dir(self): pass @abstractmethod
[docs] def default_config(self, filename): pass
@staticmethod @abstractmethod
[docs] def validate(conf): pass
[docs] def build_all_defaults(self): conf = {} for name in presto_conf.REQUIRED_FILES: conf[name] = self.default_config(name) return conf