44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
"use strict";
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const { MeterProvider } = require('@opentelemetry/sdk-metrics-base');
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const { PrometheusExporter } = require('@opentelemetry/exporter-prometheus');
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const prometheusPort = PrometheusExporter.DEFAULT_OPTIONS.port
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const prometheusEndpoint = PrometheusExporter.DEFAULT_OPTIONS.endpoint
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const exporter = new PrometheusExporter(
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{
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startServer: true,
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},
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() => {
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console.log(
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`prometheus scrape endpoint: http://localhost:${prometheusPort}${prometheusEndpoint}`,
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);
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},
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);
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const meter = new MeterProvider({
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exporter,
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interval: 1000,
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}).getMeter('your-meter-name');
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const requestCount = meter.createCounter("requests", {
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description: "Count all incoming requests"
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});
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const boundInstruments = new Map();
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module.exports.countAllRequests = () => {
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return (req, res, next) => {
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if (!boundInstruments.has(req.path)) {
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const labels = { route: req.path };
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const boundCounter = requestCount.bind(labels);
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boundInstruments.set(req.path, boundCounter);
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}
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boundInstruments.get(req.path).add(1);
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next();
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};
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};
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