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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 com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.ObjectTraverser;
import com.yahoo.slime.Slime;
import com.yahoo.slime.SlimeUtils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Consumes a response from the metrics/v2 API and populates the fields of this with the resulting values
*
* @author bratseth
*/
public class MetricsResponse {
private final List<NodeMetrics.MetricValue> metricValues = new ArrayList<>();
public MetricsResponse(byte[] response) {
this(SlimeUtils.jsonToSlime(response));
}
public MetricsResponse(String response) {
this(SlimeUtils.jsonToSlime(response));
}
public List<NodeMetrics.MetricValue> metrics() { return metricValues; }
private MetricsResponse(Slime response) {
Inspector root = response.get();
Inspector nodes = root.field("nodes");
nodes.traverse((ArrayTraverser)(__, node) -> consumeNode(node));
}
private void consumeNode(Inspector node) {
String hostname = node.field("hostname").asString();
consumeNodeMetrics(hostname, node.field("node"));
consumeServiceMetrics(hostname, node.field("services"));
}
private void consumeNodeMetrics(String hostname, Inspector node) {
long timestamp = node.field("timestamp").asLong();
Map<String, Double> values = consumeMetrics(node.field("metrics"));
for (Resource resource : Resource.values())
addMetricIfPresent(hostname, resource.metricName(), timestamp, values);
}
private void addMetricIfPresent(String hostname, String metricName, long timestamp, Map<String, Double> values) {
if (values.containsKey(metricName))
metricValues.add(new NodeMetrics.MetricValue(hostname, metricName, timestamp, values.get(metricName).floatValue()));
}
private void consumeServiceMetrics(String hostname, Inspector node) {
String name = node.field("name").asString();
long timestamp = node.field("timestamp").asLong();
Map<String, Double> values = consumeMetrics(node.field("metrics"));
}
private Map<String, Double> consumeMetrics(Inspector metrics) {
Map<String, Double> values = new HashMap<>();
metrics.traverse((ArrayTraverser) (__, item) -> consumeMetricsItem(item, values));
return values;
}
private void consumeMetricsItem(Inspector item, Map<String, Double> values) {
item.field("values").traverse((ObjectTraverser)(name, value) -> values.put(name, value.asDouble()));
}
}
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