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PrometheusReporterRoute.java
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PrometheusReporterRoute.java
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/*
* Copyright (c) 2017 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.internal.utils.metrics.prometheus;
import static org.apache.pekko.http.javadsl.server.Directives.complete;
import static org.apache.pekko.http.javadsl.server.Directives.get;
import org.apache.pekko.http.javadsl.model.ContentType;
import org.apache.pekko.http.javadsl.model.ContentTypes;
import org.apache.pekko.http.javadsl.model.HttpResponse;
import org.apache.pekko.http.javadsl.model.StatusCodes;
import org.apache.pekko.http.javadsl.server.Route;
import org.apache.pekko.util.ByteString;
import kamon.prometheus.PrometheusReporter;
/**
* Provides a Route for a HTTP Prometheus endpoint where Prometheus can scrape metrics from.
*/
public final class PrometheusReporterRoute {
private static final ContentType CONTENT_TYPE = ContentTypes.parse("text/plain; version=0.0.4; charset=utf-8");
private PrometheusReporterRoute() {
throw new AssertionError();
}
/**
* Builds a Route for a HTTP Prometheus endpoint where Prometheus can scrape metrics from.
*
* @param prometheusReporter the PrometheusReporter to retrieve the {@code scrapeData} from
* @return the Prometheus Route
*/
public static Route buildPrometheusReporterRoute(final PrometheusReporter prometheusReporter) {
return get(() ->
complete(HttpResponse.create()
.withStatus(StatusCodes.OK)
.withEntity(CONTENT_TYPE, ByteString.fromString(prometheusReporter.scrapeData()))
)
);
}
}