| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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 |
| * |
| * 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 org.apache.rocketmq.remoting.impl.netty.handler; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.channel.ChannelFuture; |
| import io.netty.channel.ChannelFutureListener; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.handler.codec.ByteToMessageDecoder; |
| import java.util.List; |
| import org.apache.rocketmq.remoting.api.buffer.ByteBufferWrapper; |
| import org.apache.rocketmq.remoting.api.command.RemotingCommand; |
| import org.apache.rocketmq.remoting.api.exception.RemoteCodecException; |
| import org.apache.rocketmq.remoting.impl.buffer.NettyByteBufferWrapper; |
| import org.apache.rocketmq.remoting.impl.command.CodecHelper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class Decoder extends ByteToMessageDecoder { |
| private static final Logger LOG = LoggerFactory.getLogger(Decoder.class); |
| |
| public Decoder() { |
| } |
| |
| @Override |
| protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception { |
| if (!in.isReadable()) { |
| return; |
| } |
| |
| NettyByteBufferWrapper wrapper = new NettyByteBufferWrapper(in); |
| |
| Object msg = this.decode(ctx, wrapper); |
| if (msg != null) { |
| out.add(msg); |
| } |
| } |
| |
| private Object decode(final ChannelHandlerContext ctx, ByteBufferWrapper wrapper) throws Exception { |
| int originReaderIndex = wrapper.readerIndex(); |
| |
| byte magic = wrapper.readByte(); |
| try { |
| if (magic != CodecHelper.PROTOCOL_MAGIC) { |
| throw new RemoteCodecException(String.format("MagicCode %d is wrong, expect %d", magic, CodecHelper.PROTOCOL_MAGIC)); |
| } |
| return decode(wrapper, originReaderIndex); |
| } catch (final RemoteCodecException e) { |
| LOG.warn("Decode error {}, close the channel {}", e.getMessage(), ctx.channel()); |
| ctx.channel().close().addListener(new ChannelFutureListener() { |
| @Override |
| public void operationComplete(ChannelFuture future) throws Exception { |
| LOG.warn("Close channel {} because of error {},result is {}", ctx.channel(), e, future.isSuccess()); |
| } |
| }); |
| } |
| return null; |
| } |
| |
| public RemotingCommand decode(final ByteBufferWrapper wrapper, final int originReaderIndex) { |
| // Full message isn't available yet, return nothing for now |
| if (wrapper.readableBytes() < CodecHelper.MIN_PROTOCOL_LEN - 1 /*MagicCode*/) { |
| wrapper.setReaderIndex(originReaderIndex); |
| return null; |
| } |
| |
| int totalLength = wrapper.readInt(); |
| |
| if (totalLength <= 0) { |
| throw new RemoteCodecException("Illegal total length " + totalLength); |
| } |
| |
| if (totalLength > CodecHelper.PACKET_MAX_LEN) { |
| throw new RemoteCodecException(String.format("Total length %d is more than limit %d", totalLength, CodecHelper.PACKET_MAX_LEN)); |
| } |
| |
| if (wrapper.readableBytes() < totalLength - 1 /*MagicCode*/ - 4 /*TotalLen*/) { |
| wrapper.setReaderIndex(originReaderIndex); |
| return null; |
| } |
| return CodecHelper.decode(wrapper); |
| } |
| } |