/
AbstractHttpClientMetricsHandler.java
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/
AbstractHttpClientMetricsHandler.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.http.client;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufHolder;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.LastHttpContent;
import reactor.netty.channel.ChannelOperations;
import reactor.util.Logger;
import reactor.util.Loggers;
import reactor.util.annotation.Nullable;
import reactor.util.context.ContextView;
import java.net.SocketAddress;
import java.time.Duration;
import java.util.function.Function;
/**
* @author Violeta Georgieva
* @since 1.0.8
*/
abstract class AbstractHttpClientMetricsHandler extends ChannelDuplexHandler {
private static final Logger log = Loggers.getLogger(AbstractHttpClientMetricsHandler.class);
String path;
String method;
String status;
ContextView contextView;
long dataReceived;
long dataSent;
long dataReceivedTime;
long dataSentTime;
final Function<String, String> uriTagValue;
protected AbstractHttpClientMetricsHandler(@Nullable Function<String, String> uriTagValue) {
this.uriTagValue = uriTagValue;
}
protected AbstractHttpClientMetricsHandler(AbstractHttpClientMetricsHandler copy) {
this.contextView = copy.contextView;
this.dataReceived = copy.dataReceived;
this.dataReceivedTime = copy.dataReceivedTime;
this.dataSent = copy.dataSent;
this.dataSentTime = copy.dataSentTime;
this.method = copy.method;
this.path = copy.path;
this.status = copy.status;
this.uriTagValue = copy.uriTagValue;
}
@Override
@SuppressWarnings("FutureReturnValueIgnored")
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
try {
if (msg instanceof HttpRequest) {
extractDetailsFromHttpRequest(ctx, (HttpRequest) msg);
}
dataSent += extractProcessedDataFromBuffer(msg);
if (msg instanceof LastHttpContent) {
SocketAddress address = ctx.channel().remoteAddress();
promise.addListener(future -> {
try {
recordWrite(address);
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn("Exception caught while recording metrics.", e);
}
// Allow request-response exchange to continue, unaffected by metrics problem
}
});
}
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn("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 channelRead(ChannelHandlerContext ctx, Object msg) {
try {
if (msg instanceof HttpResponse) {
status = ((HttpResponse) msg).status().codeAsText().toString();
dataReceivedTime = System.nanoTime();
}
dataReceived += extractProcessedDataFromBuffer(msg);
if (msg instanceof LastHttpContent) {
recordRead(ctx.channel().remoteAddress());
reset();
}
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn("Exception caught while recording metrics.", e);
}
// Allow request-response exchange to continue, unaffected by metrics problem
}
ctx.fireChannelRead(msg);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
try {
recordException(ctx);
}
catch (RuntimeException e) {
if (log.isWarnEnabled()) {
log.warn("Exception caught while recording metrics.", e);
}
// Allow request-response exchange to continue, unaffected by metrics problem
}
ctx.fireExceptionCaught(cause);
}
private void extractDetailsFromHttpRequest(ChannelHandlerContext ctx, HttpRequest request) {
method = request.method().name();
ChannelOperations<?, ?> channelOps = ChannelOperations.get(ctx.channel());
if (channelOps instanceof HttpClientOperations) {
HttpClientOperations ops = (HttpClientOperations) channelOps;
path = uriTagValue == null ? ops.path : uriTagValue.apply(ops.path);
contextView = ops.currentContextView();
}
dataSentTime = System.nanoTime();
}
private long extractProcessedDataFromBuffer(Object msg) {
if (msg instanceof ByteBufHolder) {
return ((ByteBufHolder) msg).content().readableBytes();
}
else if (msg instanceof ByteBuf) {
return ((ByteBuf) msg).readableBytes();
}
return 0;
}
protected abstract HttpClientMetricsRecorder recorder();
protected void recordException(ChannelHandlerContext ctx) {
recorder().incrementErrorsCount(ctx.channel().remoteAddress(),
path != null ? path : resolveUri(ctx));
}
protected void recordRead(SocketAddress address) {
recorder().recordDataReceivedTime(address,
path, method, status,
Duration.ofNanos(System.nanoTime() - dataReceivedTime));
recorder().recordResponseTime(address,
path, method, status,
Duration.ofNanos(System.nanoTime() - dataSentTime));
recorder().recordDataReceived(address, path, dataReceived);
}
protected void recordWrite(SocketAddress address) {
recorder().recordDataSentTime(address,
path, method,
Duration.ofNanos(System.nanoTime() - dataSentTime));
recorder().recordDataSent(address, path, dataSent);
}
private String resolveUri(ChannelHandlerContext ctx) {
ChannelOperations<?, ?> channelOps = ChannelOperations.get(ctx.channel());
if (channelOps instanceof HttpClientOperations) {
String path = ((HttpClientOperations) channelOps).uri();
return uriTagValue == null ? path : uriTagValue.apply(path);
}
else {
return "unknown";
}
}
private void reset() {
path = null;
method = null;
status = null;
contextView = null;
dataReceived = 0;
dataSent = 0;
dataReceivedTime = 0;
dataSentTime = 0;
}
}