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Server functionality for HBase
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/*
 * 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.hadoop.hbase.ipc;

import java.nio.ByteBuffer;
import org.apache.hadoop.hbase.util.NettyFutureUtils;
import org.apache.yetus.audience.InterfaceAudience;

import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
import org.apache.hbase.thirdparty.io.netty.channel.Channel;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelPipeline;
import org.apache.hbase.thirdparty.io.netty.channel.SimpleChannelInboundHandler;
import org.apache.hbase.thirdparty.io.netty.handler.codec.LengthFieldBasedFrameDecoder;

/**
 * Handle connection preamble.
 * @since 2.0.0`
 */
@InterfaceAudience.Private
class NettyRpcServerPreambleHandler extends SimpleChannelInboundHandler {

  static final String DECODER_NAME = "preambleDecoder";

  private final NettyRpcServer rpcServer;

  public NettyRpcServerPreambleHandler(NettyRpcServer rpcServer) {
    this.rpcServer = rpcServer;
  }

  @Override
  protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
    NettyServerRpcConnection conn = createNettyServerRpcConnection(ctx.channel());
    ByteBuffer buf = ByteBuffer.allocate(msg.readableBytes());
    msg.readBytes(buf);
    buf.flip();
    if (!conn.processPreamble(buf)) {
      conn.close();
      return;
    }
    ChannelPipeline p = ctx.pipeline();
    if (conn.useSasl) {
      LengthFieldBasedFrameDecoder decoder =
        new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4);
      decoder.setSingleDecode(true);
      p.addLast(NettyHBaseSaslRpcServerHandler.DECODER_NAME, decoder);
      p.addLast(new NettyHBaseSaslRpcServerHandler(rpcServer, conn));
    } else {
      conn.setupHandler();
    }
    // add first and then remove, so the single decode decoder will pass the remaining bytes to the
    // handler above.
    p.remove(this);
    p.remove(DECODER_NAME);
  }

  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    NettyRpcServer.LOG.warn("Connection {}; caught unexpected downstream exception.",
      ctx.channel().remoteAddress(), cause);
    NettyFutureUtils.safeClose(ctx);
  }

  // will be overridden in tests
  protected NettyServerRpcConnection createNettyServerRpcConnection(Channel channel) {
    return new NettyServerRpcConnection(rpcServer, channel);
  }
}