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// Copyright (c) 2022, Compiler Explorer Authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
import express from 'express';
import PromClient from 'prom-client';
/**
* Will launch the Prometheus metrics server
*
* @param serverPort - The listening port to bind into this metrics server.
* @param hostname - The TCP host to attach the listener.
* @returns void
*/
export function setupMetricsServer(serverPort: number, hostname: string | undefined): void {
PromClient.collectDefaultMetrics();
const metricsServer = express();
metricsServer.get('/metrics', (req, res) => {
PromClient.register
.metrics()
.then(metrics => {
res.header('Content-Type', PromClient.register.contentType).send(metrics);
})
.catch(err => res.status(500).send(err));
});
// silly express typing, passing undefined is fine but
if (hostname) {
metricsServer.listen(serverPort, hostname);
} else {
metricsServer.listen(serverPort);
}
}
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