/********************************************************************************
 * Copyright (C) 2017-2018 Ericsson and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/ import { injectable , inject , named } from '@theia/core/shared/inversify' ; import * as http from 'http' ; import * as https from 'https' ; import * as express from '@theia/core/shared/express' ; import { ContributionProvider } from '@theia/core/lib/common' ; import { BackendApplicationContribution } from '@theia/core/lib/node' ; import { MetricsContribution } from './metrics-contribution' ; @ injectable ( ) export class MetricsBackendApplicationContribution implements BackendApplicationContribution { constructor ( @ inject ( ContributionProvider ) @ named ( MetricsContribution ) protected readonly metricsProviders ) { } configure ( app ) { app . get ( '/metrics' , ( req , res ) => { const lastMetrics = this . fetchMetricsFromProviders ( ) ; res . send ( lastMetrics ) ; } ) ; } onStart ( server ) { this . metricsProviders . getContributions ( ) . forEach ( contribution => { contribution . startCollecting ( ) ; } ) ; } fetchMetricsFromProviders ( ) { return this . metricsProviders . getContributions ( ) . reduce ( ( total , contribution ) => total += contribution . getMetrics ( ) + '\n' , '' ) ; } }