content: /*
   * Copyright 1999-2023 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.naming.misc;
  
  import com.alibaba.nacos.consistency.Serializer;
  import com.alibaba.nacos.consistency.snapshot.LocalFileMeta;
  import com.alibaba.nacos.consistency.snapshot.Reader;
  import com.alibaba.nacos.consistency.snapshot.Writer;
  import com.alibaba.nacos.naming.consistency.persistent.impl.AbstractSnapshotOperation;
  import com.alibaba.nacos.sys.utils.DiskUtils;
  import com.alipay.sofa.jraft.util.CRC64;
  
  import java.nio.file.Paths;
  import java.util.Objects;
  import java.util.concurrent.locks.ReentrantReadWriteLock;
  import java.util.zip.Checksum;
  
  /**
   * Switch Domain snapshot operation.
   *
   * @author xiweng.yy
   */
  public class SwitchDomainSnapshotOperation extends AbstractSnapshotOperation {
      
      private final String snapshotDir = "naming_persistent";
      
      private final String snapshotArchive = "naming_persistent.zip";
      
      private final SwitchManager switchManager;
      
      private final Serializer serializer;
      
      public SwitchDomainSnapshotOperation(ReentrantReadWriteLock lock, SwitchManager switchManager,
              Serializer serializer) {
          super(lock);
          this.switchManager = switchManager;
          this.serializer = serializer;
      }
      
      @Override
      protected boolean writeSnapshot(Writer writer) throws Exception {
          final String writePath = writer.getPath();
          final String parentPath = Paths.get(writePath, snapshotDir).toString();
          DiskUtils.deleteDirectory(parentPath);
          DiskUtils.forceMkdir(parentPath);
          
          this.switchManager.dumpSnapshot(parentPath);
          final String outputFile = Paths.get(writePath, snapshotArchive).toString();
          final Checksum checksum = new CRC64();
          DiskUtils.compress(writePath, snapshotDir, outputFile, checksum);
          DiskUtils.deleteDirectory(parentPath);
          
          final LocalFileMeta meta = new LocalFileMeta();
          meta.append(CHECK_SUM_KEY, Long.toHexString(checksum.getValue()));
          return writer.addFile(snapshotArchive, meta);
      }
      
      @Override
      protected boolean readSnapshot(Reader reader) throws Exception {
          final String readerPath = reader.getPath();
          final String sourceFile = Paths.get(readerPath, snapshotArchive).toString();
          final Checksum checksum = new CRC64();
          DiskUtils.decompress(sourceFile, readerPath, checksum);
          LocalFileMeta fileMeta = reader.getFileMeta(snapshotArchive);
          if (fileMeta.getFileMeta().containsKey(CHECK_SUM_KEY)) {
              if (!Objects.equals(Long.toHexString(checksum.getValue()), fileMeta.get(CHECK_SUM_KEY))) {
                  throw new IllegalArgumentException("Snapshot checksum failed");
              }
          }
          final String loadPath = Paths.get(readerPath, snapshotDir).toString();
          Loggers.RAFT.info("snapshot load from : {}", loadPath);
          this.switchManager.loadSnapshot(loadPath);
          DiskUtils.deleteDirectory(loadPath);
          return true;
      }
      
      @Override
      protected String getSnapshotSaveTag() {
          return SwitchDomainSnapshotOperation.class.getSimpleName() + ".SAVE";
      }
      
      @Override
      protected String getSnapshotLoadTag() {
          return SwitchDomainSnapshotOperation.class.getSimpleName() + ".LOAD";
      }
  }
  