001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.ipc;
019
020import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
021import org.apache.hbase.thirdparty.io.netty.channel.Channel;
022import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
023import org.apache.hbase.thirdparty.io.netty.channel.ChannelPipeline;
024import org.apache.hbase.thirdparty.io.netty.channel.SimpleChannelInboundHandler;
025
026import java.nio.ByteBuffer;
027
028import org.apache.yetus.audience.InterfaceAudience;
029import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
030
031/**
032 * Handle connection preamble.
033 * @since 2.0.0`
034 */
035@InterfaceAudience.Private
036class NettyRpcServerPreambleHandler extends SimpleChannelInboundHandler<ByteBuf> {
037
038  private final NettyRpcServer rpcServer;
039
040  public NettyRpcServerPreambleHandler(NettyRpcServer rpcServer) {
041    this.rpcServer = rpcServer;
042  }
043
044  @Override
045  protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
046    NettyServerRpcConnection conn = createNettyServerRpcConnection(ctx.channel());
047    ByteBuffer buf = ByteBuffer.allocate(msg.readableBytes());
048    msg.readBytes(buf);
049    buf.flip();
050    if (!conn.processPreamble(buf)) {
051      conn.close();
052      return;
053    }
054    ChannelPipeline p = ctx.pipeline();
055    ((NettyRpcFrameDecoder) p.get("frameDecoder")).setConnection(conn);
056    ((NettyRpcServerRequestDecoder) p.get("decoder")).setConnection(conn);
057    p.remove(this);
058    p.remove("preambleDecoder");
059  }
060
061  @VisibleForTesting
062  protected NettyServerRpcConnection createNettyServerRpcConnection(Channel channel) {
063    return new NettyServerRpcConnection(rpcServer, channel);
064  }
065}