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Apache Solr (module: core)
/*
* 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.solr.util.stats;
import static org.apache.solr.metrics.SolrMetricManager.mkName;
import com.codahale.metrics.Timer;
import io.opentracing.Span;
import io.opentracing.Tracer;
import io.opentracing.util.GlobalTracer;
import java.util.Locale;
import java.util.Map;
import org.apache.solr.client.solrj.impl.HttpListenerFactory;
import org.apache.solr.common.util.CollectionUtil;
import org.apache.solr.metrics.SolrMetricProducer;
import org.apache.solr.metrics.SolrMetricsContext;
import org.apache.solr.util.tracing.TraceUtils;
import org.eclipse.jetty.client.api.Request;
import org.eclipse.jetty.client.api.Result;
/**
* A HttpListenerFactory tracking metrics and distributed tracing. The Metrics are inspired and
* partially copied from dropwizard httpclient library.
*/
public class InstrumentedHttpListenerFactory implements SolrMetricProducer, HttpListenerFactory {
public interface NameStrategy {
String getNameFor(String scope, Request request);
}
private static final NameStrategy QUERYLESS_URL_AND_METHOD =
(scope, request) -> {
String schemeHostPort =
request.getScheme()
+ "://"
+ request.getHost()
+ ":"
+ request.getPort()
+ request.getPath();
return mkName(schemeHostPort + "." + methodNameString(request), scope);
};
private static final NameStrategy METHOD_ONLY =
(scope, request) -> mkName(methodNameString(request), scope);
private static final NameStrategy HOST_AND_METHOD =
(scope, request) -> {
String schemeHostPort =
request.getScheme() + "://" + request.getHost() + ":" + request.getPort();
return mkName(schemeHostPort + "." + methodNameString(request), scope);
};
public static final Map KNOWN_METRIC_NAME_STRATEGIES =
CollectionUtil.newHashMap(3);
static {
KNOWN_METRIC_NAME_STRATEGIES.put("queryLessURLAndMethod", QUERYLESS_URL_AND_METHOD);
KNOWN_METRIC_NAME_STRATEGIES.put("hostAndMethod", HOST_AND_METHOD);
KNOWN_METRIC_NAME_STRATEGIES.put("methodOnly", METHOD_ONLY);
}
protected SolrMetricsContext solrMetricsContext;
protected String scope;
protected NameStrategy nameStrategy;
public InstrumentedHttpListenerFactory(NameStrategy nameStrategy) {
this.nameStrategy = nameStrategy;
}
private static String methodNameString(Request request) {
return request.getMethod().toLowerCase(Locale.ROOT) + ".requests";
}
@Override
public RequestResponseListener get() {
return new RequestResponseListener() {
Timer.Context timerContext;
Tracer tracer = GlobalTracer.get();
Span span;
@Override
public void onQueued(Request request) {
// do tracing onQueued because it's called from Solr's thread
span = tracer.activeSpan();
TraceUtils.injectTraceContext(request, span);
}
@Override
public void onBegin(Request request) {
if (solrMetricsContext != null) {
timerContext = timer(request).time();
}
if (span != null) {
span.log("Client Send"); // perhaps delayed a bit after the span started in enqueue
}
}
@Override
public void onComplete(Result result) {
if (timerContext != null) {
timerContext.stop();
}
if (result.isFailed() && span != null) {
span.log(result.toString()); // logs failure info and interesting stuff
}
}
};
}
private Timer timer(Request request) {
return solrMetricsContext.timer(nameStrategy.getNameFor(scope, request));
}
@Override
public void initializeMetrics(SolrMetricsContext parentContext, String scope) {
this.solrMetricsContext = parentContext;
this.scope = scope;
}
@Override
public SolrMetricsContext getSolrMetricsContext() {
return solrMetricsContext;
}
}