com.alibaba.nacos.client.config.impl.YmlChangeParser Maven / Gradle / Ivy
/*
* Copyright 1999-2018 Alibaba Group Holding Ltd.
*
* 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
* limitations under the License.
*/
package com.alibaba.nacos.client.config.impl;
import com.alibaba.nacos.api.config.ConfigChangeItem;
import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.api.exception.runtime.NacosRuntimeException;
import com.alibaba.nacos.common.utils.StringUtils;
import org.yaml.snakeyaml.LoaderOptions;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.composer.ComposerException;
import org.yaml.snakeyaml.constructor.SafeConstructor;
import org.yaml.snakeyaml.error.MarkedYAMLException;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* YmlChangeParser.
*
* @author rushsky518
*/
public class YmlChangeParser extends AbstractConfigChangeParser {
private static final String INVALID_CONSTRUCTOR_ERROR_INFO = "could not determine a constructor for the tag";
private static final String CONFIG_TYPE = "yaml";
public YmlChangeParser() {
super(CONFIG_TYPE);
}
@Override
public Map doParse(String oldContent, String newContent, String type) {
Map oldMap = Collections.emptyMap();
Map newMap = Collections.emptyMap();
try {
Yaml yaml = new Yaml(new SafeConstructor(new LoaderOptions()));
if (StringUtils.isNotBlank(oldContent)) {
oldMap = yaml.load(oldContent);
oldMap = getFlattenedMap(oldMap);
}
if (StringUtils.isNotBlank(newContent)) {
newMap = yaml.load(newContent);
newMap = getFlattenedMap(newMap);
}
} catch (MarkedYAMLException e) {
handleYamlException(e);
}
return filterChangeData(oldMap, newMap);
}
private void handleYamlException(MarkedYAMLException e) {
if (e.getMessage().startsWith(INVALID_CONSTRUCTOR_ERROR_INFO) || e instanceof ComposerException) {
throw new NacosRuntimeException(NacosException.INVALID_PARAM,
"AbstractConfigChangeListener only support basic java data type for yaml. If you want to listen "
+ "key changes for custom classes, please use `Listener` to listener whole yaml configuration and parse it by yourself.",
e);
}
throw e;
}
private Map getFlattenedMap(Map source) {
Map result = new LinkedHashMap<>(128);
buildFlattenedMap(result, source, null);
return result;
}
private void buildFlattenedMap(Map result, Map source, String path) {
for (Iterator> itr = source.entrySet().iterator(); itr.hasNext(); ) {
Map.Entry e = itr.next();
String key = e.getKey();
if (StringUtils.isNotBlank(path)) {
if (e.getKey().startsWith("[")) {
key = path + key;
} else {
key = path + '.' + key;
}
}
if (e.getValue() instanceof String) {
result.put(key, e.getValue());
} else if (e.getValue() instanceof Map) {
@SuppressWarnings("unchecked") Map map = (Map) e.getValue();
buildFlattenedMap(result, map, key);
} else if (e.getValue() instanceof Collection) {
@SuppressWarnings("unchecked") Collection