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.plugin.control.utils;
  
  import org.apache.commons.io.FileUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.CharBuffer;
  import java.nio.channels.FileChannel;
  import java.nio.charset.Charset;
  import java.nio.charset.CharsetDecoder;
  import java.nio.charset.StandardCharsets;
  import java.util.Objects;
  
  /**
   * IO operates on the utility class.
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  public final class DiskUtils {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(DiskUtils.class);
      
      private static final String NO_SPACE_CN = "设备上没有空间";
      
      private static final String NO_SPACE_EN = "No space left on device";
      
      private static final String DISK_QUOTA_CN = "超出磁盘限额";
      
      private static final String DISK_QUOTA_EN = "Disk quota exceeded";
      
      private static final Charset CHARSET = StandardCharsets.UTF_8;
      
      private static final CharsetDecoder DECODER = CHARSET.newDecoder();
      
      /**
       * read this file content.
       *
       * @param file {@link File}
       * @return content
       */
      public static String readFile(File file) {
          try (FileChannel fileChannel = new FileInputStream(file).getChannel()) {
              StringBuilder text = new StringBuilder();
              ByteBuffer buffer = ByteBuffer.allocate(4096);
              CharBuffer charBuffer = CharBuffer.allocate(4096);
              while (fileChannel.read(buffer) != -1) {
                  buffer.flip();
                  DECODER.decode(buffer, charBuffer, false);
                  charBuffer.flip();
                  while (charBuffer.hasRemaining()) {
                      text.append(charBuffer.get());
                  }
                  buffer.clear();
                  charBuffer.clear();
              }
              return text.toString();
          } catch (IOException e) {
              return null;
          }
      }
      
      /**
       * Writes the contents to the target file.
       *
       * @param file    target file
       * @param content content
       * @param append  write append mode
       * @return write success
       */
      public static boolean writeFile(File file, byte[] content, boolean append) {
          try (FileChannel fileChannel = new FileOutputStream(file, append).getChannel()) {
              ByteBuffer buffer = ByteBuffer.wrap(content);
              fileChannel.write(buffer);
              return true;
          } catch (IOException ioe) {
              if (ioe.getMessage() != null) {
                  String errMsg = ioe.getMessage();
                  if (NO_SPACE_CN.equals(errMsg) || NO_SPACE_EN.equals(errMsg) || errMsg.contains(DISK_QUOTA_CN) || errMsg
                          .contains(DISK_QUOTA_EN)) {
                      LOGGER.warn("磁盘满，自杀退出");
                      System.exit(0);
                  }
              }
          }
          return false;
      }
      
      public static void deleteQuietly(File file) {
          Objects.requireNonNull(file, "file");
          FileUtils.deleteQuietly(file);
      }
      
  }
  