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2d1c84ea2e
```
> require('http').globalAgent.sockets
{ 'HOST:PORT:': [{ ... }, { ... }] }
```
- `new URL('http://HOST:PORT:')` throws
-> test suite `open_sockets`
- gauges were not cleaned up after no agents were present for a given
key. This lead to continuous emission of the previous connection
count for a given hostname, following the completion of all requests.
-> test suite `when all requests complete`
52 lines
1.8 KiB
JavaScript
52 lines
1.8 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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// 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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function collectOpenConnections(sockets, seenHosts, prefix) {
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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(`open_connections.${prefix}.${hostname}`, openConnections)
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})
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}
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module.exports = OpenSocketsMonitor = {
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monitor(logger) {
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const interval = setInterval(
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() => OpenSocketsMonitor.gaugeOpenSockets(),
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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() {
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collectOpenConnections(SOCKETS_HTTP, SEEN_HOSTS_HTTP, 'http')
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collectOpenConnections(SOCKETS_HTTPS, SEEN_HOSTS_HTTPS, 'https')
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}
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}
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