]>
Commit | Line | Data |
---|---|---|
1 | import { Application, Request, Response } from 'express' | |
2 | import { Meter, metrics } from '@opentelemetry/api-metrics' | |
3 | import { PrometheusExporter } from '@opentelemetry/exporter-prometheus' | |
4 | import { MeterProvider } from '@opentelemetry/sdk-metrics-base' | |
5 | import { logger } from '@server/helpers/logger' | |
6 | import { CONFIG } from '@server/initializers/config' | |
7 | import { MVideoImmutable } from '@server/types/models' | |
8 | import { PlaybackMetricCreate } from '@shared/models' | |
9 | import { | |
10 | JobQueueObserversBuilder, | |
11 | LivesObserversBuilder, | |
12 | NodeJSObserversBuilder, | |
13 | PlaybackMetrics, | |
14 | StatsObserversBuilder, | |
15 | ViewersObserversBuilder | |
16 | } from './metric-helpers' | |
17 | ||
18 | class OpenTelemetryMetrics { | |
19 | ||
20 | private static instance: OpenTelemetryMetrics | |
21 | ||
22 | private meter: Meter | |
23 | ||
24 | private onRequestDuration: (req: Request, res: Response) => void | |
25 | ||
26 | private playbackMetrics: PlaybackMetrics | |
27 | ||
28 | private constructor () {} | |
29 | ||
30 | init (app: Application) { | |
31 | if (CONFIG.OPEN_TELEMETRY.METRICS.ENABLED !== true) return | |
32 | ||
33 | app.use((req, res, next) => { | |
34 | res.once('finish', () => { | |
35 | if (!this.onRequestDuration) return | |
36 | ||
37 | this.onRequestDuration(req as Request, res as Response) | |
38 | }) | |
39 | ||
40 | next() | |
41 | }) | |
42 | } | |
43 | ||
44 | registerMetrics () { | |
45 | if (CONFIG.OPEN_TELEMETRY.METRICS.ENABLED !== true) return | |
46 | ||
47 | logger.info('Registering Open Telemetry metrics') | |
48 | ||
49 | const provider = new MeterProvider({ | |
50 | views: [ | |
51 | ...NodeJSObserversBuilder.getViews() | |
52 | ] | |
53 | }) | |
54 | ||
55 | provider.addMetricReader(new PrometheusExporter({ port: CONFIG.OPEN_TELEMETRY.METRICS.PROMETHEUS_EXPORTER.PORT })) | |
56 | ||
57 | metrics.setGlobalMeterProvider(provider) | |
58 | ||
59 | this.meter = metrics.getMeter('default') | |
60 | ||
61 | this.buildRequestObserver() | |
62 | ||
63 | this.playbackMetrics = new PlaybackMetrics(this.meter) | |
64 | this.playbackMetrics.buildCounters() | |
65 | ||
66 | const nodeJSObserversBuilder = new NodeJSObserversBuilder(this.meter) | |
67 | nodeJSObserversBuilder.buildObservers() | |
68 | ||
69 | const jobQueueObserversBuilder = new JobQueueObserversBuilder(this.meter) | |
70 | jobQueueObserversBuilder.buildObservers() | |
71 | ||
72 | const statsObserversBuilder = new StatsObserversBuilder(this.meter) | |
73 | statsObserversBuilder.buildObservers() | |
74 | ||
75 | const livesObserversBuilder = new LivesObserversBuilder(this.meter) | |
76 | livesObserversBuilder.buildObservers() | |
77 | ||
78 | const viewersObserversBuilder = new ViewersObserversBuilder(this.meter) | |
79 | viewersObserversBuilder.buildObservers() | |
80 | } | |
81 | ||
82 | observePlaybackMetric (video: MVideoImmutable, metrics: PlaybackMetricCreate) { | |
83 | this.playbackMetrics.observe(video, metrics) | |
84 | } | |
85 | ||
86 | private buildRequestObserver () { | |
87 | const requestDuration = this.meter.createHistogram('http_request_duration_ms', { | |
88 | unit: 'milliseconds', | |
89 | description: 'Duration of HTTP requests in ms' | |
90 | }) | |
91 | ||
92 | this.onRequestDuration = (req: Request, res: Response) => { | |
93 | const duration = Date.now() - res.locals.requestStart | |
94 | ||
95 | requestDuration.record(duration, { | |
96 | path: this.buildRequestPath(req.originalUrl), | |
97 | method: req.method, | |
98 | statusCode: res.statusCode + '' | |
99 | }) | |
100 | } | |
101 | } | |
102 | ||
103 | private buildRequestPath (path: string) { | |
104 | return path.split('?')[0] | |
105 | } | |
106 | ||
107 | static get Instance () { | |
108 | return this.instance || (this.instance = new this()) | |
109 | } | |
110 | } | |
111 | ||
112 | export { | |
113 | OpenTelemetryMetrics | |
114 | } |