@lokalise/fastify-extras/dist/plugins/bullMqMetricsPlugin.js

Opinionated set of fastify plugins, commonly used in Lokalise

import 'fastify-metrics';
import fp from 'fastify-plugin';
import { PromiseBasedCollectionScheduler } from './bull-mq-metrics/CollectionScheduler.js';
import { MetricsCollector } from './bull-mq-metrics/MetricsCollector.js';
import { BackgroundJobsBasedQueueDiscoverer } from './bull-mq-metrics/queueDiscoverers.js';
function plugin(fastify, pluginOptions, next) {
    if (!fastify.metrics) {
        return next(new Error('No Prometheus Client found, BullMQ metrics plugin requires `fastify-metrics` plugin to be registered'));
    }
    const options = {
        bullMqPrefix: 'bull',
        metricsPrefix: 'bullmq',
        queueDiscoverer: new BackgroundJobsBasedQueueDiscoverer(pluginOptions.redisConfigs),
        excludedQueues: [],
        histogramBuckets: [20, 50, 150, 400, 1000, 3000, 8000, 22000, 60000, 150000],
        collectionOptions: {
            type: 'interval',
            intervalInMs: 5000,
        },
        ...pluginOptions,
    };
    try {
        const collector = new MetricsCollector(options, fastify.metrics.client.register, fastify.log);
        const collectFn = async () => await collector.collect();
        let scheduler;
        if (options.collectionOptions.type === 'interval') {
            scheduler = new PromiseBasedCollectionScheduler(options.collectionOptions.intervalInMs, collectFn);
            // Void is set so the scheduler can run indefinitely
            void scheduler.start();
        }
        fastify.addHook('onClose', async () => {
            if (scheduler) {
                scheduler.stop();
            }
            await collector.dispose();
        });
        fastify.decorate('bullMqMetrics', {
            collect: collectFn,
        });
        next();
    }
    catch (err) {
        return next(err instanceof Error
            ? err
            : new Error('Unknown error in bull-mq-metrics-plugin', { cause: err }));
    }
}
export const bullMqMetricsPlugin = fp(plugin, {
    fastify: '5.x',
    name: 'bull-mq-metrics-plugin',
});
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