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   /*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project licenses this file to you 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:
    *
    *   https://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 io.netty.handler.codec.http2;
  
  import static io.netty.handler.codec.http2.Http2FrameLogger.Direction.INBOUND;
  import static io.netty.util.internal.ObjectUtil.checkNotNull;
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.util.internal.UnstableApi;
  
  /**
   * Decorator around a {@link Http2FrameReader} that logs all inbound frames before calling
   * back the listener.
   */
  @UnstableApi
  public class Http2InboundFrameLogger implements Http2FrameReader {
      private final Http2FrameReader reader;
      private final Http2FrameLogger logger;
  
      public Http2InboundFrameLogger(Http2FrameReader reader, Http2FrameLogger logger) {
          this.reader = checkNotNull(reader, "reader");
          this.logger = checkNotNull(logger, "logger");
      }
  
      @Override
      public void readFrame(ChannelHandlerContext ctx, ByteBuf input, final Http2FrameListener listener)
              throws Http2Exception {
          reader.readFrame(ctx, input, new Http2FrameListener() {
  
              @Override
              public int onDataRead(ChannelHandlerContext ctx, int streamId, ByteBuf data,
                      int padding, boolean endOfStream)
                      throws Http2Exception {
                  logger.logData(INBOUND, ctx, streamId, data, padding, endOfStream);
                  return listener.onDataRead(ctx, streamId, data, padding, endOfStream);
              }
  
              @Override
              public void onHeadersRead(ChannelHandlerContext ctx, int streamId,
                      Http2Headers headers, int padding, boolean endStream)
                      throws Http2Exception {
                  logger.logHeaders(INBOUND, ctx, streamId, headers, padding, endStream);
                  listener.onHeadersRead(ctx, streamId, headers, padding, endStream);
              }
  
              @Override
              public void onHeadersRead(ChannelHandlerContext ctx, int streamId,
                      Http2Headers headers, int streamDependency, short weight, boolean exclusive,
                      int padding, boolean endStream) throws Http2Exception {
                  logger.logHeaders(INBOUND, ctx, streamId, headers, streamDependency, weight, exclusive,
                          padding, endStream);
                  listener.onHeadersRead(ctx, streamId, headers, streamDependency, weight, exclusive,
                          padding, endStream);
              }
  
              @Override
              public void onPriorityRead(ChannelHandlerContext ctx, int streamId,
                      int streamDependency, short weight, boolean exclusive) throws Http2Exception {
                  logger.logPriority(INBOUND, ctx, streamId, streamDependency, weight, exclusive);
                  listener.onPriorityRead(ctx, streamId, streamDependency, weight, exclusive);
              }
  
              @Override
              public void onRstStreamRead(ChannelHandlerContext ctx, int streamId, long errorCode)
                      throws Http2Exception {
                  logger.logRstStream(INBOUND, ctx, streamId, errorCode);
                  listener.onRstStreamRead(ctx, streamId, errorCode);
              }
  
              @Override
              public void onSettingsAckRead(ChannelHandlerContext ctx) throws Http2Exception {
                  logger.logSettingsAck(INBOUND, ctx);
                  listener.onSettingsAckRead(ctx);
              }
  
              @Override
              public void onSettingsRead(ChannelHandlerContext ctx, Http2Settings settings)
                      throws Http2Exception {
                  logger.logSettings(INBOUND, ctx, settings);
                  listener.onSettingsRead(ctx, settings);
              }
  
              @Override
              public void onPingRead(ChannelHandlerContext ctx, long data) throws Http2Exception {
                  logger.logPing(INBOUND, ctx, data);
                  listener.onPingRead(ctx, data);
             }
 
             @Override
             public void onPingAckRead(ChannelHandlerContext ctx, long data) throws Http2Exception {
                 logger.logPingAck(INBOUND, ctx, data);
                 listener.onPingAckRead(ctx, data);
             }
 
             @Override
             public void onPushPromiseRead(ChannelHandlerContext ctx, int streamId,
                     int promisedStreamId, Http2Headers headers, int padding) throws Http2Exception {
                 logger.logPushPromise(INBOUND, ctx, streamId, promisedStreamId, headers, padding);
                 listener.onPushPromiseRead(ctx, streamId, promisedStreamId, headers, padding);
             }
 
             @Override
             public void onGoAwayRead(ChannelHandlerContext ctx, int lastStreamId, long errorCode,
                     ByteBuf debugData) throws Http2Exception {
                 logger.logGoAway(INBOUND, ctx, lastStreamId, errorCode, debugData);
                 listener.onGoAwayRead(ctx, lastStreamId, errorCode, debugData);
             }
 
             @Override
             public void onWindowUpdateRead(ChannelHandlerContext ctx, int streamId, int windowSizeIncrement)
                     throws Http2Exception {
                 logger.logWindowsUpdate(INBOUND, ctx, streamId, windowSizeIncrement);
                 listener.onWindowUpdateRead(ctx, streamId, windowSizeIncrement);
             }
 
             @Override
             public void onUnknownFrame(ChannelHandlerContext ctx, byte frameType, int streamId,
                     Http2Flags flags, ByteBuf payload) throws Http2Exception {
                 logger.logUnknownFrame(INBOUND, ctx, frameType, streamId, flags, payload);
                 listener.onUnknownFrame(ctx, frameType, streamId, flags, payload);
             }
         });
     }
 
     @Override
     public void close() {
         reader.close();
     }
 
     @Override
     public Configuration configuration() {
         return reader.configuration();
     }
 }