content: /*
   * Copyright 1999-2020 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.config.server.remote;
  
  import com.alibaba.nacos.api.config.remote.request.cluster.ConfigChangeClusterSyncRequest;
  import com.alibaba.nacos.api.config.remote.response.cluster.ConfigChangeClusterSyncResponse;
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.remote.RemoteConstants;
  import com.alibaba.nacos.api.remote.request.RequestMeta;
  import com.alibaba.nacos.auth.annotation.Secured;
  import com.alibaba.nacos.common.utils.StringUtils;
  import com.alibaba.nacos.common.utils.VersionUtils;
  import com.alibaba.nacos.config.server.configuration.ConfigCompatibleConfig;
  import com.alibaba.nacos.config.server.model.gray.BetaGrayRule;
  import com.alibaba.nacos.config.server.model.gray.TagGrayRule;
  import com.alibaba.nacos.config.server.service.ConfigMigrateService;
  import com.alibaba.nacos.config.server.service.dump.DumpRequest;
  import com.alibaba.nacos.config.server.service.dump.DumpService;
  import com.alibaba.nacos.config.server.utils.ParamUtils;
  import com.alibaba.nacos.config.server.utils.PropertyUtil;
  import com.alibaba.nacos.core.control.TpsControl;
  import com.alibaba.nacos.core.namespace.filter.NamespaceValidation;
  import com.alibaba.nacos.core.paramcheck.ExtractorManager;
  import com.alibaba.nacos.core.paramcheck.impl.ConfigRequestParamExtractor;
  import com.alibaba.nacos.core.remote.RequestHandler;
  import com.alibaba.nacos.core.remote.grpc.InvokeSource;
  import com.alibaba.nacos.core.utils.Loggers;
  import com.alibaba.nacos.plugin.auth.constant.ApiType;
  import com.alibaba.nacos.plugin.auth.constant.SignType;
  import org.springframework.stereotype.Component;
  
  /**
   * handler to handler config change from other servers.
   *
   * @author liuzunfei
   * @version $Id: ConfigChangeClusterSyncRequestHandler.java, v 0.1 2020年08月11日 4:35 PM liuzunfei Exp $
   */
  @Component
  @InvokeSource(source = {RemoteConstants.LABEL_SOURCE_CLUSTER})
  public class ConfigChangeClusterSyncRequestHandler
          extends RequestHandler<ConfigChangeClusterSyncRequest, ConfigChangeClusterSyncResponse> {
      
      private final DumpService dumpService;
      
      private ConfigMigrateService configMigrateService;
      
      public ConfigChangeClusterSyncRequestHandler(DumpService dumpService,
              ConfigMigrateService configMigrateService) {
          this.dumpService = dumpService;
          this.configMigrateService = configMigrateService;
      }
  
      @Override
      @NamespaceValidation
      @TpsControl(pointName = "ClusterConfigChangeNotify")
      @ExtractorManager.Extractor(rpcExtractor = ConfigRequestParamExtractor.class)
      @Secured(signType = SignType.CONFIG, apiType = ApiType.INNER_API)
      public ConfigChangeClusterSyncResponse handle(ConfigChangeClusterSyncRequest configChangeSyncRequest,
              RequestMeta meta) throws NacosException {
          
          checkCompatity(configChangeSyncRequest, meta);
          
          ParamUtils.checkParam(configChangeSyncRequest.getTag());
          DumpRequest dumpRequest = DumpRequest.create(configChangeSyncRequest.getDataId(),
                  configChangeSyncRequest.getGroup(), configChangeSyncRequest.getTenant(),
                  configChangeSyncRequest.getLastModified(), meta.getClientIp());
          
          dumpRequest.setGrayName(configChangeSyncRequest.getGrayName());
          dumpService.dump(dumpRequest);
          return new ConfigChangeClusterSyncResponse();
      }
      
      /**
       * if notified from old server,try to migrate and transfer gray model.
       *
       * @param configChangeSyncRequest request.
       */
      private void checkCompatity(ConfigChangeClusterSyncRequest configChangeSyncRequest, RequestMeta meta) {
          if (PropertyUtil.isGrayCompatibleModel() && StringUtils.isBlank(configChangeSyncRequest.getGrayName())) {
              if (configChangeSyncRequest.isBeta() || StringUtils.isNotBlank(configChangeSyncRequest.getTag())) {
                  
                  String grayName = null;
                  //from old server ,beta or tag persist into old model,try migrate and transfer gray model.
                  if (configChangeSyncRequest.isBeta()) {
                      configMigrateService.checkMigrateBeta(configChangeSyncRequest.getDataId(),
                              configChangeSyncRequest.getGroup(), configChangeSyncRequest.getTenant());
                      grayName = BetaGrayRule.TYPE_BETA;
                  } else {
                      configMigrateService.checkMigrateTag(configChangeSyncRequest.getDataId(),
                              configChangeSyncRequest.getGroup(), configChangeSyncRequest.getTenant(),
                              configChangeSyncRequest.getTag());
                      grayName = TagGrayRule.TYPE_TAG + "_" + configChangeSyncRequest.getTag();
                  }
                  configChangeSyncRequest.setGrayName(grayName);
                  
              }
          }
          
          if (!checkNamespaceCompatible(configChangeSyncRequest, meta)) {
              return;
          }
          
          if (StringUtils.isNotBlank(configChangeSyncRequest.getGrayName())) {
              configMigrateService.namespaceMigrateGray(configChangeSyncRequest.getDataId(),
                      configChangeSyncRequest.getGroup(), configChangeSyncRequest.getTenant(),
                      configChangeSyncRequest.getGrayName());
          } else {
              configMigrateService.namespaceMigrate(configChangeSyncRequest.getDataId(),
                      configChangeSyncRequest.getGroup(), configChangeSyncRequest.getTenant());
          }
          
          configChangeSyncRequest.setTenant("public");
      }
      
      /**
       * Check namespace compatible boolean.
       *
       * @param configSyncRequest the config sync request
       * @param meta              the meta
       * @return the boolean
       */
      public boolean checkNamespaceCompatible(ConfigChangeClusterSyncRequest configSyncRequest, RequestMeta meta) {
          if (!ConfigCompatibleConfig.getInstance().isNamespaceCompatibleMode()) {
              return false;
          }
          final String ignoreCheckVersion = "3.0.0";
          final String clusterVersionPrefixNew = "Nacos-Server:v";
          final String clusterVersionPrefixOld = "Nacos-Java-Client:v";
          try {
              String version = null;
              if (meta.getClientVersion().split(clusterVersionPrefixNew).length > 1) {
                  version = meta.getClientVersion().split(clusterVersionPrefixNew)[1];
              } else {
                  version = meta.getClientVersion().split(clusterVersionPrefixOld)[1];
              }
              if (VersionUtils.compareVersion(version, ignoreCheckVersion) >= 0) {
                  return false;
              }
          } catch (Exception e) {
              Loggers.REMOTE_DIGEST.error("checkCompatity error", e);
          }
          return StringUtils.equals(configSyncRequest.getTenant(), "public") || StringUtils.isBlank(
                  configSyncRequest.getTenant());
      }
      
  }
  