| #!/usr/bin/env python |
| |
| ''' |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you 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. |
| ''' |
| |
| import json |
| import logging |
| import os |
| |
| logger = logging.getLogger() |
| |
| class ActualConfigHandler: |
| CONFIG_NAME = 'config.json' |
| |
| def __init__(self, config, configTags): |
| self.config = config |
| self.configTags = configTags |
| |
| def findRunDir(self): |
| runDir = '/var/run/ambari-agent' |
| if self.config.has_option('agent', 'prefix'): |
| runDir = self.config.get('agent', 'prefix') |
| if not os.path.exists(runDir): |
| runDir = '/tmp' |
| return runDir |
| |
| def write_actual(self, tags): |
| self.write_file(self.CONFIG_NAME, tags) |
| |
| def write_actual_component(self, component, tags): |
| self.configTags[component] = tags |
| filename = component + "_" + self.CONFIG_NAME |
| self.write_file(filename, tags) |
| |
| def write_client_components(self, serviceName, tags): |
| from LiveStatus import LiveStatus |
| for comp in LiveStatus.CLIENT_COMPONENTS: |
| if comp['serviceName'] == serviceName: |
| componentName = comp['componentName'] |
| if componentName in self.configTags and \ |
| tags != self.configTags[componentName]: |
| self.write_actual_component(componentName, tags) |
| pass |
| |
| def write_file(self, filename, tags): |
| runDir = self.findRunDir() |
| conf_file = open(os.path.join(runDir, filename), 'w') |
| json.dump(tags, conf_file) |
| conf_file.close() |
| |
| def read_file(self, filename): |
| runDir = self.findRunDir() |
| fullname = os.path.join(runDir, filename) |
| if os.path.isfile(fullname): |
| res = None |
| conf_file = open(os.path.join(runDir, filename), 'r') |
| try: |
| res = json.load(conf_file) |
| if (0 == len(res)): |
| res = None |
| except Exception, e: |
| logger.error("Error parsing " + filename + ": " + repr(e)) |
| res = None |
| pass |
| conf_file.close() |
| |
| return res |
| return None |
| |
| def read_actual(self): |
| return self.read_file(self.CONFIG_NAME) |
| |
| def read_actual_component(self, componentName): |
| if componentName not in self.configTags.keys(): |
| self.configTags[componentName] = \ |
| self.read_file(componentName + "_" + self.CONFIG_NAME) |
| return self.configTags[componentName] |