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/*
 * Copyright (c) SiteWhere, LLC. All rights reserved. http://www.sitewhere.com
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package com.sitewhere.microservice.metrics;

import java.io.IOException;

import com.sitewhere.microservice.lifecycle.LifecycleComponent;
import com.sitewhere.spi.SiteWhereException;
import com.sitewhere.spi.microservice.lifecycle.ILifecycleProgressMonitor;
import com.sitewhere.spi.microservice.metrics.IMetricsServer;

import io.prometheus.client.exporter.HTTPServer;

/**
 * Provides Prometheus metrics over HTTP.
 */
public class MetricsServer extends LifecycleComponent implements IMetricsServer {

    /** HTTP metric export server */
    private HTTPServer httpServer;

    /*
     * @see
     * com.sitewhere.server.lifecycle.LifecycleComponent#start(com.sitewhere.spi.
     * server.lifecycle.ILifecycleProgressMonitor)
     */
    @Override
    public void start(ILifecycleProgressMonitor monitor) throws SiteWhereException {
	if (getHttpServer() != null) {
	    getHttpServer().stop();
	}
	try {
	    this.httpServer = new HTTPServer(getMicroservice().getInstanceSettings().getMetricsHttpPort());
	    getLogger().info(String.format("Microservice metrics available via HTTP on port %s.",
		    getMicroservice().getInstanceSettings().getMetricsHttpPort()));
	} catch (IOException e) {
	    throw new SiteWhereException("Unable to initialize metrics HTTP server.", e);
	}
    }

    /*
     * @see
     * com.sitewhere.server.lifecycle.LifecycleComponent#stop(com.sitewhere.spi.
     * server.lifecycle.ILifecycleProgressMonitor)
     */
    @Override
    public void stop(ILifecycleProgressMonitor monitor) throws SiteWhereException {
	if (getHttpServer() != null) {
	    getHttpServer().stop();
	}
    }

    protected HTTPServer getHttpServer() {
	return httpServer;
    }
}