AsyncIoByteCounterExec.java
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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package org.apache.hc.client5.http.observation.interceptors;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import org.apache.hc.client5.http.async.AsyncExecCallback;
import org.apache.hc.client5.http.async.AsyncExecChain;
import org.apache.hc.client5.http.async.AsyncExecChainHandler;
import org.apache.hc.client5.http.observation.MetricConfig;
import org.apache.hc.client5.http.observation.ObservingOptions;
import org.apache.hc.core5.http.EntityDetails;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.nio.AsyncEntityProducer;
import org.apache.hc.core5.util.Args;
/**
* Counts request / response payload bytes for <b>asynchronous</b> clients.
* <p>
* Meters:
* <ul>
* <li>{@code <prefix>.request.bytes} (counter, baseUnit=bytes)</li>
* <li>{@code <prefix>.response.bytes} (counter, baseUnit=bytes)</li>
* </ul>
* Tags: {@code method}, {@code status}, and when {@link ObservingOptions.TagLevel#EXTENDED}
* also {@code protocol}, {@code target}. If {@link MetricConfig#perUriIo} is true, adds {@code uri}.
* Any {@link MetricConfig#commonTags} are appended. A custom tag mutator may be provided via
* {@code ObservingOptions.tagCustomizer}.
*
* @since 5.6
*/
public final class AsyncIoByteCounterExec implements AsyncExecChainHandler {
private final MeterRegistry meterRegistry;
private final ObservingOptions opts;
private final MetricConfig mc;
private final Counter.Builder reqBuilder;
private final Counter.Builder respBuilder;
public AsyncIoByteCounterExec(final MeterRegistry meterRegistry,
final ObservingOptions opts,
final MetricConfig mc) {
this.meterRegistry = Args.notNull(meterRegistry, "meterRegistry");
this.opts = Args.notNull(opts, "observingOptions");
this.mc = Args.notNull(mc, "metricConfig");
this.reqBuilder = Counter.builder(mc.prefix + ".request.bytes")
.description("HTTP request payload size")
.baseUnit("bytes");
this.respBuilder = Counter.builder(mc.prefix + ".response.bytes")
.description("HTTP response payload size")
.baseUnit("bytes");
}
@Override
public void execute(final HttpRequest request,
final AsyncEntityProducer entityProducer,
final AsyncExecChain.Scope scope,
final AsyncExecChain chain,
final AsyncExecCallback callback)
throws HttpException, IOException {
if (!opts.spanSampling.test(request.getRequestUri())) {
chain.proceed(request, entityProducer, scope, callback);
return;
}
final long reqBytes = entityProducer != null ? entityProducer.getContentLength() : -1L;
final AtomicReference<HttpResponse> respRef = new AtomicReference<>();
final AtomicLong respLen = new AtomicLong(-1L);
final AsyncExecCallback wrapped = new AsyncExecCallback() {
@Override
public org.apache.hc.core5.http.nio.AsyncDataConsumer handleResponse(
final HttpResponse response, final EntityDetails entityDetails) throws HttpException, IOException {
respRef.set(response);
if (entityDetails != null) {
respLen.set(entityDetails.getContentLength());
}
return callback.handleResponse(response, entityDetails);
}
@Override
public void handleInformationResponse(final HttpResponse response) throws HttpException, IOException {
callback.handleInformationResponse(response);
}
@Override
public void completed() {
record();
callback.completed();
}
@Override
public void failed(final Exception cause) {
record();
callback.failed(cause);
}
private void record() {
final HttpResponse rsp = respRef.get();
final int status = rsp != null ? rsp.getCode() : 599;
final String protocol = scope.route.getTargetHost().getSchemeName();
final String target = scope.route.getTargetHost().getHostName();
final String uri = request.getRequestUri();
final List<Tag> tags = buildTags(request.getMethod(), status, protocol, target, uri);
if (reqBytes >= 0) {
reqBuilder.tags(tags).tags(mc.commonTags).register(meterRegistry).increment(reqBytes);
}
final long rb = respLen.get();
if (rb >= 0) {
respBuilder.tags(tags).tags(mc.commonTags).register(meterRegistry).increment(rb);
}
}
};
chain.proceed(request, entityProducer, scope, wrapped);
}
private List<Tag> buildTags(final String method,
final int status,
final String protocol,
final String target,
final String uri) {
final List<Tag> tags = new ArrayList<>(8);
tags.add(Tag.of("method", method));
tags.add(Tag.of("status", Integer.toString(status)));
if (opts.tagLevel == ObservingOptions.TagLevel.EXTENDED) {
tags.add(Tag.of("protocol", protocol));
tags.add(Tag.of("target", target));
}
if (mc.perUriIo) {
tags.add(Tag.of("uri", uri));
}
return opts.tagCustomizer.apply(tags, method, status, protocol, target, uri);
}
}