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1 | import { Application, Request, Response } from 'express' | |
2 | import { Meter, metrics } from '@opentelemetry/api' | |
3 | import { PrometheusExporter } from '@opentelemetry/exporter-prometheus' | |
4 | import { MeterProvider } from '@opentelemetry/sdk-metrics' | |
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 | BittorrentTrackerObserversBuilder, | |
11 | JobQueueObserversBuilder, | |
12 | LivesObserversBuilder, | |
13 | NodeJSObserversBuilder, | |
14 | PlaybackMetrics, | |
15 | StatsObserversBuilder, | |
16 | ViewersObserversBuilder | |
17 | } from './metric-helpers' | |
18 | ||
19 | class OpenTelemetryMetrics { | |
20 | ||
21 | private static instance: OpenTelemetryMetrics | |
22 | ||
23 | private meter: Meter | |
24 | ||
25 | private onRequestDuration: (req: Request, res: Response) => void | |
26 | ||
27 | private playbackMetrics: PlaybackMetrics | |
28 | ||
29 | private constructor () {} | |
30 | ||
31 | init (app: Application) { | |
32 | if (CONFIG.OPEN_TELEMETRY.METRICS.ENABLED !== true) return | |
33 | ||
34 | app.use((req, res, next) => { | |
35 | res.once('finish', () => { | |
36 | if (!this.onRequestDuration) return | |
37 | ||
38 | this.onRequestDuration(req as Request, res as Response) | |
39 | }) | |
40 | ||
41 | next() | |
42 | }) | |
43 | } | |
44 | ||
45 | registerMetrics (options: { trackerServer: any }) { | |
46 | if (CONFIG.OPEN_TELEMETRY.METRICS.ENABLED !== true) return | |
47 | ||
48 | logger.info('Registering Open Telemetry metrics') | |
49 | ||
50 | const provider = new MeterProvider({ | |
51 | views: [ | |
52 | ...NodeJSObserversBuilder.getViews() | |
53 | ] | |
54 | }) | |
55 | ||
56 | provider.addMetricReader(new PrometheusExporter({ | |
57 | host: CONFIG.OPEN_TELEMETRY.METRICS.PROMETHEUS_EXPORTER.HOSTNAME, | |
58 | port: CONFIG.OPEN_TELEMETRY.METRICS.PROMETHEUS_EXPORTER.PORT | |
59 | })) | |
60 | ||
61 | metrics.setGlobalMeterProvider(provider) | |
62 | ||
63 | this.meter = metrics.getMeter('default') | |
64 | ||
65 | this.buildRequestObserver() | |
66 | ||
67 | this.playbackMetrics = new PlaybackMetrics(this.meter) | |
68 | this.playbackMetrics.buildCounters() | |
69 | ||
70 | const nodeJSObserversBuilder = new NodeJSObserversBuilder(this.meter) | |
71 | nodeJSObserversBuilder.buildObservers() | |
72 | ||
73 | const jobQueueObserversBuilder = new JobQueueObserversBuilder(this.meter) | |
74 | jobQueueObserversBuilder.buildObservers() | |
75 | ||
76 | const statsObserversBuilder = new StatsObserversBuilder(this.meter) | |
77 | statsObserversBuilder.buildObservers() | |
78 | ||
79 | const livesObserversBuilder = new LivesObserversBuilder(this.meter) | |
80 | livesObserversBuilder.buildObservers() | |
81 | ||
82 | const viewersObserversBuilder = new ViewersObserversBuilder(this.meter) | |
83 | viewersObserversBuilder.buildObservers() | |
84 | ||
85 | const bittorrentTrackerObserversBuilder = new BittorrentTrackerObserversBuilder(this.meter, options.trackerServer) | |
86 | bittorrentTrackerObserversBuilder.buildObservers() | |
87 | } | |
88 | ||
89 | observePlaybackMetric (video: MVideoImmutable, metrics: PlaybackMetricCreate) { | |
90 | this.playbackMetrics.observe(video, metrics) | |
91 | } | |
92 | ||
93 | private buildRequestObserver () { | |
94 | const requestDuration = this.meter.createHistogram('http_request_duration_ms', { | |
95 | unit: 'milliseconds', | |
96 | description: 'Duration of HTTP requests in ms' | |
97 | }) | |
98 | ||
99 | this.onRequestDuration = (req: Request, res: Response) => { | |
100 | const duration = Date.now() - res.locals.requestStart | |
101 | ||
102 | requestDuration.record(duration, { | |
103 | path: this.buildRequestPath(req.originalUrl), | |
104 | method: req.method, | |
105 | statusCode: res.statusCode + '' | |
106 | }) | |
107 | } | |
108 | } | |
109 | ||
110 | private buildRequestPath (path: string) { | |
111 | return path.split('?')[0] | |
112 | } | |
113 | ||
114 | static get Instance () { | |
115 | return this.instance || (this.instance = new this()) | |
116 | } | |
117 | } | |
118 | ||
119 | export { | |
120 | OpenTelemetryMetrics | |
121 | } |