flink源码分析 - yaml解析
flink版本: flink-1.12.1
代码位置: org.apache.flink.configuration.GlobalConfiguration
主要看下解析yaml文件的方法: org.apache.flink.configuration.GlobalConfiguration#loadYAMLResource
/*
* 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.
**/
package org.apache.flink.configuration;
import org.apache.flink.annotation.Internal;
import org.apache.flink.util.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nullable;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
/*
* Global configuration object for Flink. Similar to Java properties configuration objects it
* includes key-value pairs which represent the framework's configuration.
**/
@Internal
public final class GlobalConfiguration {
private static final Logger LOG = LoggerFactory.getLogger(GlobalConfiguration.class);
public static final String FLINK_CONF_FILENAME = "flink-conf.yaml";
// the keys whose values should be hidden
private static final String[] SENSITIVE_KEYS = new String[]{"password", "secret", "fs.azure.account.key", "apikey"};
// the hidden content to be displayed
public static final String HIDDEN_CONTENT = "******";
// --------------------------------------------------------------------------------------------
private GlobalConfiguration() {
}
// --------------------------------------------------------------------------------------------
/**
* Loads the global configuration from the environment. Fails if an error occurs during loading.
* Returns an empty configuration object if the environment variable is not set. In production
* this variable is set but tests and local execution/debugging don't have this environment
* variable set. That's why we should fail if it is not set.
*
* @return Returns the Configuration
*/
public static Configuration loadConfiguration() {
return loadConfiguration(new Configuration());
}
/**
* Loads the global configuration and adds the given dynamic properties configuration.
*
* @param dynamicProperties The given dynamic properties
* @return Returns the loaded global configuration with dynamic properties
*/
public static Configuration loadConfiguration(Configuration dynamicProperties) {
final String configDir = System.getenv(ConfigConstants.ENV_FLINK_CONF_DIR);
if(configDir == null) {
return new Configuration(dynamicProperties);
}
return loadConfiguration(configDir, dynamicProperties);
}
/**
* Loads the configuration files from the specified directory.
*
* YAML files are supported as configuration files.
*
* @param configDir the directory which contains the configuration files
*/
public static Configuration loadConfiguration(final String configDir) {
return loadConfiguration(configDir, null);
}
/**
* Loads the configuration files from the specified directory. If the dynamic properties
* configuration is not null, then it is added to the loaded configuration.
*
* @param configDir directory to load the configuration from
* @param dynamicProperties configuration file containing the dynamic properties. Null if none.
* @return The configuration loaded from the given configuration directory
*/
public static Configuration loadConfiguration(final String configDir, @Nullable final Configuration dynamicProperties) {
if(configDir == null) {
throw new IllegalArgumentException("Given configuration directory is null, cannot load configuration");
}
final File confDirFile = new File(configDir);
if(!(confDirFile.exists())) {
throw new IllegalConfigurationException("The given configuration directory name '" + configDir + "' (" + confDirFile
.getAbsolutePath() + ") does not describe an existing directory.");
}
/*************************************************
* TODO_MA 马中华 https://blog.csdn.net/zhongqi2513
* 注释： flink-conf.yaml
*/
// get Flink yaml configuration file
final File yamlConfigFile = new File(confDirFile, FLINK_CONF_FILENAME);
if(!yamlConfigFile.exists()) {
throw new IllegalConfigurationException("The Flink config file '" + yamlConfigFile + "' (" + confDirFile.getAbsolutePath() + ") does not exist.");
}
/*************************************************
* TODO_MA 马中华 https://blog.csdn.net/zhongqi2513
* 注释： 解析配置
*/
Configuration configuration = loadYAMLResource(yamlConfigFile);
if(dynamicProperties != null) {
configuration.addAll(dynamicProperties);
}
return configuration;
}
/**
* Loads a YAML-file of key-value pairs.
*
*
Colon and whitespace ": " separate key and value (one per line). The hash tag "#" starts a
* single-line comment.
*
*
Example:
*
*
* jobmanager.rpc.address: localhost # network address for communication with the job manager
* jobmanager.rpc.port : 6123 # network port to connect to for communication with the job manager
* taskmanager.rpc.port : 6122 # network port the task manager expects incoming IPC connections
*
*
* This does not span the whole YAML specification, but only the *syntax* of simple YAML
* key-value pairs (see issue #113 on GitHub). If at any point in time, there is a need to go
* beyond simple key-value pairs syntax compatibility will allow to introduce a YAML parser
* library.
*
* @param file the YAML file to read from
* @see YAML 1.2 specification
*/
private static Configuration loadYAMLResource(File file) {
final Configuration config = new Configuration();
try(BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file)))) {
String line;
int lineNo = 0;
while((line = reader.readLine()) != null) {
lineNo++;
// 1. check for comments
String[] comments = line.split("#", 2);
String conf = comments[0].trim();
// 2. get key and value
if(conf.length() > 0) {
String[] kv = conf.split(": ", 2);
// skip line with no valid key-value pair
if(kv.length == 1) {
LOG.warn("Error while trying to split key and value in configuration file " + file + ":" + lineNo + ": \"" + line + "\"");
continue;
}
String key = kv[0].trim();
String value = kv[1].trim();
// sanity check
if(key.length() == 0 || value.length() == 0) {
LOG.warn("Error after splitting key and value in configuration file " + file + ":" + lineNo + ": \"" + line + "\"");
continue;
}
LOG.info("Loading configuration property: {}, {}", key, isSensitive(key) ? HIDDEN_CONTENT : value);
config.setString(key, value);
}
}
} catch(IOException e) {
throw new RuntimeException("Error parsing YAML configuration.", e);
}
return config;
}
/**
* Check whether the key is a hidden key.
*
* @param key the config key
*/
public static boolean isSensitive(String key) {
Preconditions.checkNotNull(key, "key is null");
final String keyInLower = key.toLowerCase();
for(String hideKey : SENSITIVE_KEYS) {
if(keyInLower.length() >= hideKey.length() && keyInLower.contains(hideKey)) {
return true;
}
}
return false;
}
}