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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 io.opentelemetry.context.Scope;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.apache.hadoop.hbase.codec.Codec;
import org.apache.hadoop.hbase.exceptions.ConnectionClosedException;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
import org.apache.hbase.thirdparty.io.netty.buffer.ByteBufInputStream;
import org.apache.hbase.thirdparty.io.netty.buffer.ByteBufOutputStream;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelDuplexHandler;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelFuture;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
import org.apache.hbase.thirdparty.io.netty.channel.ChannelPromise;
import org.apache.hbase.thirdparty.io.netty.handler.timeout.IdleStateEvent;
import org.apache.hbase.thirdparty.io.netty.util.concurrent.PromiseCombiner;
import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.CellBlockMeta;
import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.RequestHeader;
/**
* The netty rpc handler.
* @since 2.0.0
*/
@InterfaceAudience.Private
class NettyRpcDuplexHandler extends ChannelDuplexHandler {
private static final Logger LOG = LoggerFactory.getLogger(NettyRpcDuplexHandler.class);
private final NettyRpcConnection conn;
private final CellBlockBuilder cellBlockBuilder;
private final Codec codec;
private final CompressionCodec compressor;
private final Map id2Call = new HashMap<>();
public NettyRpcDuplexHandler(NettyRpcConnection conn, CellBlockBuilder cellBlockBuilder,
Codec codec, CompressionCodec compressor) {
this.conn = conn;
this.cellBlockBuilder = cellBlockBuilder;
this.codec = codec;
this.compressor = compressor;
}
private void writeRequest(ChannelHandlerContext ctx, Call call, ChannelPromise promise)
throws IOException {
id2Call.put(call.id, call);
ByteBuf cellBlock = cellBlockBuilder.buildCellBlock(codec, compressor, call.cells, ctx.alloc());
CellBlockMeta cellBlockMeta;
if (cellBlock != null) {
CellBlockMeta.Builder cellBlockMetaBuilder = CellBlockMeta.newBuilder();
cellBlockMetaBuilder.setLength(cellBlock.writerIndex());
cellBlockMeta = cellBlockMetaBuilder.build();
} else {
cellBlockMeta = null;
}
RequestHeader requestHeader = IPCUtil.buildRequestHeader(call, cellBlockMeta);
int sizeWithoutCellBlock = IPCUtil.getTotalSizeWhenWrittenDelimited(requestHeader, call.param);
int totalSize =
cellBlock != null ? sizeWithoutCellBlock + cellBlock.writerIndex() : sizeWithoutCellBlock;
ByteBuf buf = ctx.alloc().buffer(sizeWithoutCellBlock + 4);
buf.writeInt(totalSize);
try (ByteBufOutputStream bbos = new ByteBufOutputStream(buf)) {
requestHeader.writeDelimitedTo(bbos);
if (call.param != null) {
call.param.writeDelimitedTo(bbos);
}
if (cellBlock != null) {
ChannelPromise withoutCellBlockPromise = ctx.newPromise();
ctx.write(buf, withoutCellBlockPromise);
ChannelPromise cellBlockPromise = ctx.newPromise();
ctx.write(cellBlock, cellBlockPromise);
PromiseCombiner combiner = new PromiseCombiner(ctx.executor());
combiner.addAll((ChannelFuture) withoutCellBlockPromise, cellBlockPromise);
combiner.finish(promise);
} else {
ctx.write(buf, promise);
}
call.callStats.setRequestSizeBytes(totalSize);
}
}
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise)
throws Exception {
if (msg instanceof Call) {
Call call = (Call) msg;
try (Scope scope = call.span.makeCurrent()) {
writeRequest(ctx, call, promise);
}
} else {
ctx.write(msg, promise);
}
}
private void readResponse(ChannelHandlerContext ctx, ByteBuf buf) throws IOException {
try {
conn.readResponse(new ByteBufInputStream(buf), id2Call, null,
remoteExc -> exceptionCaught(ctx, remoteExc));
} catch (IOException e) {
// In netty, the decoding the frame based, when reaching here we have already read a full
// frame, so hitting exception here does not mean the stream decoding is broken, thus we do
// not need to throw the exception out and close the connection.
LOG.warn("failed to process response", e);
}
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
if (msg instanceof ByteBuf) {
ByteBuf buf = (ByteBuf) msg;
try {
readResponse(ctx, buf);
} finally {
buf.release();
}
} else {
super.channelRead(ctx, msg);
}
}
private void cleanupCalls(IOException error) {
for (Call call : id2Call.values()) {
call.setException(error);
}
id2Call.clear();
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
if (!id2Call.isEmpty()) {
cleanupCalls(new ConnectionClosedException("Connection closed"));
}
conn.shutdown();
ctx.fireChannelInactive();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
if (!id2Call.isEmpty()) {
cleanupCalls(IPCUtil.toIOE(cause));
}
conn.shutdown();
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
if (evt instanceof IdleStateEvent) {
IdleStateEvent idleEvt = (IdleStateEvent) evt;
switch (idleEvt.state()) {
case WRITER_IDLE:
if (id2Call.isEmpty()) {
if (LOG.isTraceEnabled()) {
LOG.trace("shutdown connection to " + conn.remoteId().address
+ " because idle for a long time");
}
// It may happen that there are still some pending calls in the event loop queue and
// they will get a closed channel exception. But this is not a big deal as it rarely
// rarely happens and the upper layer could retry immediately.
conn.shutdown();
}
break;
default:
LOG.warn("Unrecognized idle state " + idleEvt.state());
break;
}
} else if (evt instanceof CallEvent) {
// just remove the call for now until we add other call event other than timeout and cancel.
id2Call.remove(((CallEvent) evt).call.id);
} else {
ctx.fireUserEventTriggered(evt);
}
}
}
