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PrometheusOutputTest.java
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PrometheusOutputTest.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.metrics.output;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.MetricRegistry;
import org.junit.Test;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URL;
import java.net.URLConnection;
import java.util.Scanner;
import java.util.TreeMap;
import java.util.function.LongConsumer;
import org.neo4j.helpers.HostnamePort;
import org.neo4j.logging.Log;
import static java.util.Collections.emptySortedMap;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
public class PrometheusOutputTest
{
@Test
public void eventsShouldBeRedirectedToGauges() throws Throwable
{
MetricRegistry registry = new MetricRegistry();
DynamicAddressPrometheusOutput dynamicOutput = new DynamicAddressPrometheusOutput( "localhost", registry, mock( Log.class ) );
LongConsumer callback = l ->
{
TreeMap<String,Gauge> gauges = new TreeMap<>();
gauges.put( "my.event", () -> l );
dynamicOutput.report( gauges, emptySortedMap(), emptySortedMap(), emptySortedMap(), emptySortedMap() );
};
callback.accept( 10 );
dynamicOutput.init();
dynamicOutput.start();
String serverAddress = dynamicOutput.getServerAddress();
assertTrue( getResponse( serverAddress ).contains( "my_event 10.0" ) );
assertTrue( getResponse( serverAddress ).contains( "my_event 10.0" ) );
callback.accept( 20 );
assertTrue( getResponse( serverAddress ).contains( "my_event 20.0" ) );
assertTrue( getResponse( serverAddress ).contains( "my_event 20.0" ) );
}
@Test
public void metricsRegisteredAfterStartShouldBeIncluded() throws Throwable
{
MetricRegistry registry = new MetricRegistry();
DynamicAddressPrometheusOutput dynamicOutput = new DynamicAddressPrometheusOutput( "localhost", registry, mock( Log.class ) );
LongConsumer callback = l ->
{
TreeMap<String,Gauge> gauges = new TreeMap<>();
gauges.put( "my.event", () -> l );
dynamicOutput.report( gauges, emptySortedMap(), emptySortedMap(), emptySortedMap(), emptySortedMap() );
};
registry.register( "my.metric", (Gauge) () -> 10 );
dynamicOutput.init();
dynamicOutput.start();
callback.accept( 20 );
String serverAddress = dynamicOutput.getServerAddress();
String response = getResponse( serverAddress );
assertTrue( response.contains( "my_metric 10.0" ) );
assertTrue( response.contains( "my_event 20.0" ) );
}
private static String getResponse( String serverAddress ) throws IOException
{
String url = "http://" + serverAddress + "/metrics";
URLConnection connection = new URL( url ).openConnection();
connection.setDoOutput( true );
connection.connect();
try ( Scanner s = new Scanner( connection.getInputStream(), "UTF-8" ).useDelimiter( "\\A" ) )
{
assertTrue( s.hasNext() );
String ret = s.next();
assertFalse( s.hasNext() );
return ret;
}
}
private static class DynamicAddressPrometheusOutput extends PrometheusOutput
{
DynamicAddressPrometheusOutput( String host, MetricRegistry registry, Log logger )
{
super( new HostnamePort( host ), registry, logger );
}
String getServerAddress()
{
InetSocketAddress address = server.getAddress();
return address.getHostString() + ":" + address.getPort();
}
}
}