Soul源码学习(九) - Nacos数据同步

本文将介绍一下Soul网关中Nacos的数据同步使用；

启动步骤

1. 修改soul-admin中的配置；
2. 修改soul-bootstrap中的配置；
3. 启动本地Nacos；
4. 启动soul-admin和soul-bootstrap工厂；

• soul-admin中的配置

soul:
  database:
    dialect: mysql
    init_script: "META-INF/schema.sql"
  sync:
#    websocket:
#      enabled: true
#    zookeeper:
#      url: localhost:2181
#      sessionTimeout: 5000
#      connectionTimeout: 2000
#    http:
#      enabled: true
      nacos:
        url: localhost:8848
        namespace: 1c10d748-af86-43b9-8265-75f487d20c6c
        acm:
          enabled: false
          endpoint: acm.aliyun.com
          namespace:
          accessKey:
          secretKey:

• soul-bootstrap中的配置

soul :
    file:
      enabled: true
    corss:
      enabled: true
    dubbo :
      parameter: multi
    sync:
#        websocket :
#             urls: ws://localhost:9095/websocket

#    zookeeper:
#      url: localhost:2181
#      sessionTimeout: 5000
#      connectionTimeout: 2000
#      http:
#        url : http://localhost:9095
        nacos:
              url: localhost:8848
              namespace: 1c10d748-af86-43b9-8265-75f487d20c6c
              acm:
                enabled: false
                endpoint: acm.aliyun.com
                namespace:
                accessKey:
                secretKey:

同步步骤

1. 启动bootstrap以后会直接执行NacosSyncDataConfiguration将nacosSyncDataService, nacosConfigService, nacosConfig三个bean注入到容器中；
2. nacosSyncDataService在启动后会自动创建一个监听器监听nacos；
   NacosSyncDataService.java

   /**
    * Start.
    */
   public void start() {
          
       watcherData(PLUGIN_DATA_ID, this::updatePluginMap);
       watcherData(SELECTOR_DATA_ID, this::updateSelectorMap);
       watcherData(RULE_DATA_ID, this::updateRuleMap);
       watcherData(META_DATA_ID, this::updateMetaDataMap);
       watcherData(AUTH_DATA_ID, this::updateAuthMap);
   }
   

   NacosCacheHandler.java

   protected void watcherData(final String dataId, final OnChange oc) {
          
       Listener listener = new Listener() {
          
           @Override
           public void receiveConfigInfo(final String configInfo) {
          
               oc.change(configInfo);
           }
   
           @Override
           public Executor getExecutor() {
          
               return null;
           }
       };
       oc.change(getConfigAndSignListener(dataId, listener));
       LISTENERS.getOrDefault(dataId, new ArrayList<>()).add(listener);
   }
   

3. 用户在Soul网关控制台的操作，都会出发DataChangedEventDispatcher中的onApplicationEvent里的监听事件；

   ...
   @Override
   @SuppressWarnings("unchecked")
   public void onApplicationEvent(final DataChangedEvent event) {
          
       for (DataChangedListener listener : listeners) {
          
           switch (event.getGroupKey()) {
          
               case APP_AUTH:
                   listener.onAppAuthChanged((List<AppAuthData>) event.getSource(), event.getEventType());
                   break;
               case PLUGIN:
                   listener.onPluginChanged((List<PluginData>) event.getSource(), event.getEventType());
                   break;
               case RULE:
                   listener.onRuleChanged((List<RuleData>) event.getSource(), event.getEventType());
                   break;
               case SELECTOR:
                   listener.onSelectorChanged((List<SelectorData>) event.getSource(), event.getEventType());
                   break;
               case META_DATA:
                   listener.onMetaDataChanged((List<MetaData>) event.getSource(), event.getEventType());
                   break;
               default:
                   throw new IllegalStateException("Unexpected value: " + event.getGroupKey());
           }
       }
   }
   ...
   

4. onApplicationEvent将同时出发NacosDataChangedListener中的方法进行数据同步，加载数据到JVM缓存中；