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/*
* Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
*/
package ai.vespa.metricsproxy.http.application;
import ai.vespa.metricsproxy.http.MetricsHandler;
import ai.vespa.metricsproxy.metric.model.MetricsPacket;
import ai.vespa.metricsproxy.metric.model.json.GenericJsonUtil;
import com.yahoo.yolean.Exceptions;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import java.io.IOException;
import java.net.URI;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.List;
import java.util.logging.Logger;
import static com.yahoo.log.LogLevel.DEBUG;
import static java.util.Collections.emptyList;
/**
* This class is used to retrieve metrics from a single Vespa node over http.
* Keeps and serves a snapshot of the node's metrics, with a fixed TTL, to
* avoid unnecessary load on metrics proxies.
*
* @author gjoranv
*/
public class NodeMetricsClient {
private static final Logger log = Logger.getLogger(NodeMetricsClient.class.getName());
static final Duration METRICS_TTL = Duration.ofSeconds(30);
private final HttpClient httpClient;
private final Node node;
private final Clock clock;
private List<MetricsPacket.Builder> metrics = emptyList();
private Instant metricsTimestamp = Instant.EPOCH;
private long snapshotsRetrieved = 0;
public NodeMetricsClient(HttpClient httpClient, Node node, Clock clock) {
this.httpClient = httpClient;
this.node = node;
this.clock = clock;
}
public List<MetricsPacket.Builder> getMetrics() {
if (Instant.now(clock).isAfter(metricsTimestamp.plus(METRICS_TTL))) {
retrieveMetrics();
}
return metrics;
}
private void retrieveMetrics() {
log.log(DEBUG, () -> "Retrieving metrics from host " + node.metricsUri);
try {
String metricsJson = httpClient.execute(new HttpGet(node.metricsUri), new BasicResponseHandler());
metrics = GenericJsonUtil.toMetricsPackets(metricsJson);
metricsTimestamp = Instant.now(clock);
snapshotsRetrieved ++;
log.log(DEBUG, () -> "Successfully retrieved " + metrics.size() + " metrics packets from " + node.metricsUri);
} catch (IOException e) {
log.warning("Unable to retrieve metrics from " + node.metricsUri + ": " + Exceptions.toMessageString(e));
metrics = emptyList();
}
}
long snapshotsRetrieved() {
return snapshotsRetrieved;
}
// TODO: move to separate file
static class Node {
final String configId;
final String host;
final int port;
final URI metricsUri;
public Node(String configId, String host, int port) {
this.configId = configId;
this.host = host;
this.port = port;
metricsUri = getMetricsUri(host, port);
}
private static URI getMetricsUri(String host, int port) {
return URI.create("http://" + host + ":" + port + MetricsHandler.VALUES_PATH);
}
}
}
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