content: /*
   * Copyright (c) 2019 abc123lzf <abc123lzf@126.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  package com.lzf.flyingsocks.protocol;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.buffer.Unpooled;
  
  import java.nio.charset.StandardCharsets;
  
  /**
   * @author lzf abc123lzf@126.com
   * @since 2021/1/21 14:20
   */
  public class PongMessage extends ServiceStageMessage {
  
      public static final byte SERVICE_ID = 0x7E;
  
      private static final byte[] CONTENT = "PONG".getBytes(StandardCharsets.US_ASCII);
  
      private static final ByteBuf BODY;
  
      static {
          ByteBuf body = Unpooled.directBuffer(1 + CONTENT.length);
          body.writeBytes(CONTENT);
          BODY = body.asReadOnly();
      }
  
      public PongMessage() {
          super(SERVICE_ID);
      }
  
      public PongMessage(ByteBuf buf) throws SerializationException {
          super(buf);
      }
  
      @Override
      public ByteBuf serialize0(ByteBufAllocator allocator) throws SerializationException {
          return BODY.retainedSlice();
      }
  
      @Override
      protected void deserialize0(ByteBuf buf) throws SerializationException {
          try {
              if (buf.readableBytes() != CONTENT.length) {
                  throw new SerializationException(PongMessage.class, "Illegal content: Wrong length");
              }
  
              for (byte b : CONTENT) {
                  if (buf.readableBytes() == 0 || buf.readByte() != b) {
                      throw new SerializationException(PongMessage.class, "Illegal content: Wrong data");
                  }
              }
          } catch (IndexOutOfBoundsException e) {
              throw new SerializationException("Unable to read pong message", e);
          }
      }
  
  }
  