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5638f06b3a
[metrics] collect HTTP socket stats for all the services GitOrigin-RevId: 52872f4ca46d8cf351f7f4b4df90f9d6b05010b3
99 lines
2.7 KiB
JavaScript
99 lines
2.7 KiB
JavaScript
/*
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* decaffeinate suggestions:
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* DS102: Remove unnecessary code created because of implicit returns
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* DS205: Consider reworking code to avoid use of IIFEs
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* DS207: Consider shorter variations of null checks
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* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
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*/
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let OpenSocketsMonitor
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const seconds = 1000
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// In Node 0.10 the default is 5, which means only 5 open connections at one.
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// Node 0.12 has a default of Infinity. Make sure we have no limit set,
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// regardless of Node version.
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require('http').globalAgent.maxSockets = Infinity
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require('https').globalAgent.maxSockets = Infinity
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const SOCKETS_HTTP = require('http').globalAgent.sockets
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const SOCKETS_HTTPS = require('https').globalAgent.sockets
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const FREE_SOCKETS_HTTP = require('http').globalAgent.freeSockets
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const FREE_SOCKETS_HTTPS = require('https').globalAgent.freeSockets
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// keep track of set gauges and reset them in the next collection cycle
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const SEEN_HOSTS_HTTP = new Set()
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const SEEN_HOSTS_HTTPS = new Set()
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const FREE_SEEN_HOSTS_HTTP = new Set()
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const FREE_SEEN_HOSTS_HTTPS = new Set()
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function collectConnectionsCount(
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sockets,
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seenHosts,
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status,
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https,
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emitLegacyMetric
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) {
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const Metrics = require('./index')
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Object.keys(sockets).forEach(host => seenHosts.add(host))
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seenHosts.forEach(host => {
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// host: 'HOST:PORT:'
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const hostname = host.split(':')[0]
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const openConnections = (sockets[host] || []).length
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if (!openConnections) {
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seenHosts.delete(host)
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}
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Metrics.gauge('sockets', openConnections, 1, {
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path: hostname,
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method: https,
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status,
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})
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if (status === 'open' && emitLegacyMetric) {
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// Emit legacy metric to keep old time series intact.
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Metrics.gauge(
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`${status}_connections.${https}.${hostname}`,
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openConnections
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)
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}
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})
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}
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module.exports = OpenSocketsMonitor = {
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monitor(emitLegacyMetric) {
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const interval = setInterval(
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() => OpenSocketsMonitor.gaugeOpenSockets(emitLegacyMetric),
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5 * seconds
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)
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const Metrics = require('./index')
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return Metrics.registerDestructor(() => clearInterval(interval))
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},
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gaugeOpenSockets(emitLegacyMetric) {
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collectConnectionsCount(
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SOCKETS_HTTP,
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SEEN_HOSTS_HTTP,
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'open',
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'http',
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emitLegacyMetric
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)
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collectConnectionsCount(
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SOCKETS_HTTPS,
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SEEN_HOSTS_HTTPS,
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'open',
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'https',
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emitLegacyMetric
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)
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collectConnectionsCount(
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FREE_SOCKETS_HTTP,
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FREE_SEEN_HOSTS_HTTP,
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'free',
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'http',
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false
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)
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collectConnectionsCount(
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FREE_SOCKETS_HTTPS,
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FREE_SEEN_HOSTS_HTTPS,
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'free',
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'https',
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false
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)
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},
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}
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