/
AbstractChannelMetricsHandler.java
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/
AbstractChannelMetricsHandler.java
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/*
* Copyright (c) 2021-2022 VMware, Inc. or its affiliates, All Rights Reserved.
*
* Licensed 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 reactor.netty.channel;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.socket.DatagramPacket;
import reactor.netty.NettyPipeline;
import reactor.util.Logger;
import reactor.util.Loggers;
import reactor.util.annotation.Nullable;
import java.net.SocketAddress;
import static reactor.netty.ReactorNetty.format;
/**
* Base {@link ChannelHandler} for collecting metrics on protocol level.
*
* @author Violeta Georgieva
* @since 1.0.8
*/
public abstract class AbstractChannelMetricsHandler extends ChannelDuplexHandler {
private static final Logger log = Loggers.getLogger(AbstractChannelMetricsHandler.class);
final SocketAddress remoteAddress;
final boolean onServer;
protected AbstractChannelMetricsHandler(@Nullable SocketAddress remoteAddress, boolean onServer) {
this.remoteAddress = remoteAddress;
this.onServer = onServer;
}
@Override
public void channelActive(ChannelHandlerContext ctx) {
if (onServer) {
try {
recorder().recordServerConnectionOpened(ctx.channel().localAddress());
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn(format(ctx.channel(), "Exception caught while recording metrics."), e);
}
// Allow request-response exchange to continue, unaffected by metrics problem
}
}
ctx.fireChannelActive();
}
@Override
public void channelInactive(ChannelHandlerContext ctx) {
if (onServer) {
try {
recorder().recordServerConnectionClosed(ctx.channel().localAddress());
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn(format(ctx.channel(), "Exception caught while recording metrics."), e);
}
// Allow request-response exchange to continue, unaffected by metrics problem
}
}
ctx.fireChannelInactive();
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) {
if (!onServer) {
ctx.pipeline()
.addAfter(NettyPipeline.ChannelMetricsHandler,
NettyPipeline.ConnectMetricsHandler,
connectMetricsHandler());
}
if (ctx.pipeline().get(NettyPipeline.SslHandler) != null) {
ctx.pipeline()
.addBefore(NettyPipeline.SslHandler,
NettyPipeline.TlsMetricsHandler,
tlsMetricsHandler());
}
ctx.fireChannelRegistered();
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
try {
if (msg instanceof ByteBuf) {
ByteBuf buffer = (ByteBuf) msg;
if (buffer.readableBytes() > 0) {
recordRead(ctx, remoteAddress, buffer.readableBytes());
}
}
else if (msg instanceof DatagramPacket) {
DatagramPacket p = (DatagramPacket) msg;
ByteBuf buffer = p.content();
if (buffer.readableBytes() > 0) {
recordRead(ctx, remoteAddress != null ? remoteAddress : p.sender(), buffer.readableBytes());
}
}
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn(format(ctx.channel(), "Exception caught while recording metrics."), e);
}
// Allow request-response exchange to continue, unaffected by metrics problem
}
ctx.fireChannelRead(msg);
}
@Override
@SuppressWarnings("FutureReturnValueIgnored")
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
try {
if (msg instanceof ByteBuf) {
ByteBuf buffer = (ByteBuf) msg;
if (buffer.readableBytes() > 0) {
recordWrite(ctx, remoteAddress, buffer.readableBytes());
}
}
else if (msg instanceof DatagramPacket) {
DatagramPacket p = (DatagramPacket) msg;
ByteBuf buffer = p.content();
if (buffer.readableBytes() > 0) {
recordWrite(ctx, remoteAddress != null ? remoteAddress : p.recipient(), buffer.readableBytes());
}
}
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn(format(ctx.channel(), "Exception caught while recording metrics."), e);
}
// Allow request-response exchange to continue, unaffected by metrics problem
}
//"FutureReturnValueIgnored" this is deliberate
ctx.write(msg, promise);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
try {
recordException(ctx, remoteAddress != null ? remoteAddress : ctx.channel().remoteAddress());
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn(format(ctx.channel(), "Exception caught while recording metrics."), e);
}
// Allow request-response exchange to continue, unaffected by metrics problem
}
ctx.fireExceptionCaught(cause);
}
public abstract ChannelHandler connectMetricsHandler();
public abstract ChannelHandler tlsMetricsHandler();
public abstract ChannelMetricsRecorder recorder();
protected void recordException(ChannelHandlerContext ctx, SocketAddress address) {
recorder().incrementErrorsCount(address);
}
protected void recordRead(ChannelHandlerContext ctx, SocketAddress address, long bytes) {
recorder().recordDataReceived(address, bytes);
}
protected void recordWrite(ChannelHandlerContext ctx, SocketAddress address, long bytes) {
recorder().recordDataSent(address, bytes);
}
}