115 lines
3.2 KiB
TypeScript
115 lines
3.2 KiB
TypeScript
import { Application, Request, Response } from 'express'
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import { Meter, metrics } from '@opentelemetry/api-metrics'
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import { PrometheusExporter } from '@opentelemetry/exporter-prometheus'
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import { MeterProvider } from '@opentelemetry/sdk-metrics-base'
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import { logger } from '@server/helpers/logger'
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import { CONFIG } from '@server/initializers/config'
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import { MVideoImmutable } from '@server/types/models'
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import { PlaybackMetricCreate } from '@shared/models'
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import {
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JobQueueObserversBuilder,
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LivesObserversBuilder,
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NodeJSObserversBuilder,
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PlaybackMetrics,
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StatsObserversBuilder,
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ViewersObserversBuilder
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} from './metric-helpers'
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class OpenTelemetryMetrics {
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private static instance: OpenTelemetryMetrics
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private meter: Meter
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private onRequestDuration: (req: Request, res: Response) => void
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private playbackMetrics: PlaybackMetrics
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private constructor () {}
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init (app: Application) {
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if (CONFIG.OPEN_TELEMETRY.METRICS.ENABLED !== true) return
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app.use((req, res, next) => {
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res.once('finish', () => {
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if (!this.onRequestDuration) return
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this.onRequestDuration(req as Request, res as Response)
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})
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next()
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})
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}
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registerMetrics () {
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if (CONFIG.OPEN_TELEMETRY.METRICS.ENABLED !== true) return
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logger.info('Registering Open Telemetry metrics')
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const provider = new MeterProvider({
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views: [
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...NodeJSObserversBuilder.getViews()
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]
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})
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provider.addMetricReader(new PrometheusExporter({ port: CONFIG.OPEN_TELEMETRY.METRICS.PROMETHEUS_EXPORTER.PORT }))
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metrics.setGlobalMeterProvider(provider)
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this.meter = metrics.getMeter('default')
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this.buildRequestObserver()
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this.playbackMetrics = new PlaybackMetrics(this.meter)
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this.playbackMetrics.buildCounters()
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const nodeJSObserversBuilder = new NodeJSObserversBuilder(this.meter)
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nodeJSObserversBuilder.buildObservers()
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const jobQueueObserversBuilder = new JobQueueObserversBuilder(this.meter)
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jobQueueObserversBuilder.buildObservers()
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const statsObserversBuilder = new StatsObserversBuilder(this.meter)
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statsObserversBuilder.buildObservers()
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const livesObserversBuilder = new LivesObserversBuilder(this.meter)
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livesObserversBuilder.buildObservers()
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const viewersObserversBuilder = new ViewersObserversBuilder(this.meter)
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viewersObserversBuilder.buildObservers()
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}
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observePlaybackMetric (video: MVideoImmutable, metrics: PlaybackMetricCreate) {
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this.playbackMetrics.observe(video, metrics)
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}
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private buildRequestObserver () {
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const requestDuration = this.meter.createHistogram('http_request_duration_ms', {
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unit: 'milliseconds',
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description: 'Duration of HTTP requests in ms'
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})
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this.onRequestDuration = (req: Request, res: Response) => {
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const duration = Date.now() - res.locals.requestStart
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requestDuration.record(duration, {
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path: this.buildRequestPath(req.originalUrl),
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method: req.method,
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statusCode: res.statusCode + ''
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})
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}
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}
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private buildRequestPath (path: string) {
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return path.split('?')[0]
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}
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static get Instance () {
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return this.instance || (this.instance = new this())
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}
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}
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export {
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OpenTelemetryMetrics
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}
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