88 lines
3.2 KiB
JavaScript
88 lines
3.2 KiB
JavaScript
const axios = require('axios');
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const cache = require('./cache');
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const db = require('./db');
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const POLL_INTERVAL = 10000; // 10 seconds
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async function pollLatency() {
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try {
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const [routes] = await db.query(`
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SELECT r.*, s.url
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FROM latency_routes r
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JOIN prometheus_sources s ON r.source_id = s.id
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WHERE s.type = 'blackbox'
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`);
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if (routes.length === 0) return;
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// Poll each route
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await Promise.allSettled(routes.map(async (route) => {
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try {
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// Blackbox exporter probe URL
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// We assume ICMP module for now. If target is a URL, maybe use http_2xx
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let module = 'icmp';
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let target = route.latency_target;
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if (target.startsWith('http://') || target.startsWith('https://')) {
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module = 'http_2xx';
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}
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const probeUrl = `${route.url.replace(/\/+$/, '')}/probe?module=${module}&target=${encodeURIComponent(target)}`;
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const startTime = Date.now();
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const response = await axios.get(probeUrl, { timeout: 5000 });
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// 1. Parse prometheus text format for success and specific metrics
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let latency = null;
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let success = false;
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const lines = response.data.split('\n');
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for (const line of lines) {
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if (line.match(/^probe_success\s+1/)) {
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success = true;
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break;
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}
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}
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if (success) {
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// Try specialized metrics first for better accuracy
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const priorityMetrics = ['probe_icmp_duration_seconds', 'probe_http_duration_seconds', 'probe_duration_seconds'];
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for (const metricName of priorityMetrics) {
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const regex = new RegExp(`^${metricName}(?:\\{.*\\})?\\s+([\\d.]+)`);
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for (const line of lines) {
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const match = line.match(regex);
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if (match) {
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latency = parseFloat(match[1]) * 1000; // to ms
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break;
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}
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}
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if (latency !== null) break;
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}
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}
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// Save to Valkey
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await cache.set(`latency:route:${route.id}`, latency, 60);
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// console.log(`[Latency] Route ${route.id} (${target}): ${latency.toFixed(2)}ms`);
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} catch (err) {
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// console.error(`[Latency] Error polling route ${route.id}:`, err.message);
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await cache.set(`latency:route:${route.id}`, null, 60);
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}
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}));
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} catch (err) {
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console.error('[Latency] Service error:', err.message);
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}
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}
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let intervalId = null;
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function start() {
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if (intervalId) clearInterval(intervalId);
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pollLatency(); // initial run
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intervalId = setInterval(pollLatency, POLL_INTERVAL);
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console.log('[Latency] Background service started (polling Blackbox Exporter directly)');
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}
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module.exports = {
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start
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};
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