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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | 13x 13x 13x 13x 13x 2x 2x 2x 2x 2x 1x 1x 6x 6x 5x 5x 5x | import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
import { Gauge, register } from 'prom-client';
import { InjectQueue } from '@nestjs/bullmq';
import { Queue } from 'bullmq';
@Injectable()
export class BullMetricsService implements OnModuleInit, OnModuleDestroy {
private readonly gauge: Gauge<string>;
private timer!: NodeJS.Timeout;
constructor(
@InjectQueue('listingIndex') private readonly listingIndex: Queue,
@InjectQueue('media') private readonly media: Queue,
@InjectQueue('media-gc') private readonly mediaGc: Queue,
@InjectQueue('boost-expiry') private readonly boostExpiry: Queue,
) {
this.gauge = (register.getSingleMetric('bull_queue_lag_seconds') as Gauge<string>) ?? new Gauge({
name: 'bull_queue_lag_seconds',
help: 'Time in seconds between now and the oldest waiting job (per queue)',
labelNames: ['queue'] as const,
registers: [register],
});
}
onModuleInit() {
if (process.env.NODE_ENV === 'test') return; // skip in tests
this.timer = setInterval(() => this.sample(), 5000).unref();
}
async sample() {
await Promise.all([
this.observeQueue(this.listingIndex, 'listingIndex'),
this.observeQueue(this.media, 'media'),
this.observeQueue(this.mediaGc, 'media-gc'),
this.observeQueue(this.boostExpiry, 'boost-expiry'),
]);
}
async observeQueue(queue: Queue, name: string) {
try {
const jobs = await queue.getJobs(['waiting'], 0, 0, true);
if (jobs.length === 0) {
this.gauge.set({ queue: name }, 0);
return;
}
const lagSec = (Date.now() - jobs[0].timestamp) / 1000;
this.gauge.set({ queue: name }, lagSec);
} catch (_err) {
// ignore errors (e.g., NullQueue in dev)
}
}
onModuleDestroy() {
Iif (this.timer) clearInterval(this.timer);
}
} |