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// Copyright (c) 2017, 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 * as Sentry from '@sentry/node';
import fs from 'fs-extra';
import { logger } from '../logger';
export class HealthCheckHandler {
constructor(compilationQueue, filePath) {
this.compilationQueue = compilationQueue;
this.filePath = filePath;
this.handle = this._handle.bind(this);
}
async _handle(req, res) {
/* wait on an empty job to pass through the compilation queue
* to ensure the health check will timeout if it is deadlocked
*
* we perform the remainder of the health check outside of the
* job to minimize the duration that we hold an execution slot
*/
await this.compilationQueue.enqueue(async () => {});
if (!this.filePath) {
res.send('Everything is awesome');
return;
}
try {
const content = await fs.readFile(this.filePath);
if (content.length === 0) throw new Error('File is empty');
res.set('Content-Type', 'text/html');
res.send(content);
} catch (e) {
logger.error(`*** HEALTH CHECK FAILURE: while reading file '${this.filePath}' got ${e}`);
Sentry.captureException(e);
res.status(500).end();
}
}
}