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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metricsproxy.metric.model.prometheus;
import io.prometheus.client.Collector;
import io.prometheus.client.exporter.common.TextFormat;
import java.io.IOException;
import java.io.StringWriter;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author yj-jtakagi
* @author gjoranv
*/
public class PrometheusModel implements Enumeration<Collector.MetricFamilySamples> {
private static Logger log = Logger.getLogger(PrometheusModel.class.getName());
private final Iterator<Collector.MetricFamilySamples> metricFamilySamplesIterator;
PrometheusModel(List<Collector.MetricFamilySamples> metricFamilySamples) {
this.metricFamilySamplesIterator = metricFamilySamples.iterator();
}
@Override
public boolean hasMoreElements() {
return metricFamilySamplesIterator.hasNext();
}
@Override
public Collector.MetricFamilySamples nextElement() {
return metricFamilySamplesIterator.next();
}
public String serialize() {
var writer = new StringWriter();
try {
TextFormat.write004(writer, this);
} catch (Exception e) {
throw new PrometheusRenderingException("Could not render metrics. Check the log for details.", e);
}
return writer.toString();
}
}
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