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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.autoscale;
import ai.vespa.util.http.VespaHttpClientBuilder;
import com.google.inject.Inject;
import com.yahoo.collections.Pair;
import com.yahoo.component.AbstractComponent;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.vespa.applicationmodel.HostName;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.orchestrator.HostNameNotFoundException;
import com.yahoo.vespa.orchestrator.Orchestrator;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Collection;
import java.util.Collections;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Fetches node metrics over the metrics/v2 API
*
* @author bratseth
*/
public class MetricsV2MetricsFetcher extends AbstractComponent implements MetricsFetcher {
private static final Logger log = Logger.getLogger(MetricsV2MetricsFetcher.class.getName());
private static final String apiPath = "/metrics/v2/values";
private final NodeRepository nodeRepository;
private final Orchestrator orchestrator;
private final HttpClient httpClient;
@Inject
@SuppressWarnings("unused")
public MetricsV2MetricsFetcher(NodeRepository nodeRepository, Orchestrator orchestrator) {
this(nodeRepository, orchestrator, new ApacheHttpClient());
}
MetricsV2MetricsFetcher(NodeRepository nodeRepository, Orchestrator orchestrator, HttpClient httpClient) {
this.nodeRepository = nodeRepository;
this.orchestrator = orchestrator;
this.httpClient = httpClient;
}
@Override
public Collection<Pair<String, MetricSnapshot>> fetchMetrics(ApplicationId application) {
NodeList applicationNodes = nodeRepository.list(application).state(Node.State.active);
// Do not try to draw conclusions from utilization while unstable
if (Autoscaler.unstable(applicationNodes.asList(), nodeRepository)) return Collections.emptyList();
Optional<Node> metricsV2Container = applicationNodes.container()
.matching(node -> expectedUp(node))
.stream()
.findFirst();
if (metricsV2Container.isEmpty()) return Collections.emptyList();
// Consumer 'autoscaling' defined in com.yahoo.vespa.model.admin.monitoring.MetricConsumer
String url = "http://" + metricsV2Container.get().hostname() + ":" + 4080 + apiPath + "?consumer=autoscaling";
String response = httpClient.get(url);
return new MetricsResponse(response).metrics();
}
@Override
public void deconstruct() {
httpClient.close();
}
private boolean expectedUp(Node node) {
try {
return ! orchestrator.getNodeStatus(new HostName(node.hostname())).isSuspended();
}
catch (HostNameNotFoundException e) {
return false;
}
}
/** The simplest possible http client interface */
public interface HttpClient {
String get(String url);
void close();
}
/** Implements the HttpClient interface by delegating to an Apache HTTP client */
public static class ApacheHttpClient implements HttpClient {
private final CloseableHttpClient httpClient = VespaHttpClientBuilder.createWithBasicConnectionManager().build();
@Override
public String get(String url) {
try {
return httpClient.execute(new HttpGet(url), new BasicResponseHandler());
}
catch (IOException e) {
throw new UncheckedIOException("Could not get " + url, e);
}
}
@Override
public void close() {
try {
httpClient.close();
}
catch (IOException e) {
log.log(Level.WARNING, "Exception deconstructing", e);
}
}
}
}
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