overleaf/libraries/metrics/statsd/open_sockets.coffee

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URL = require "url"
seconds = 1000
# In Node 0.10 the default is 5, which means only 5 open connections at one.
# Node 0.12 has a default of Infinity. Make sure we have no limit set,
# regardless of Node version.
require("http").globalAgent.maxSockets = Infinity
require("https").globalAgent.maxSockets = Infinity
module.exports = OpenSocketsMonitor =
monitor: (logger) ->
interval = setInterval () ->
OpenSocketsMonitor.gaugeOpenSockets()
, 5 * seconds
Metrics = require "./metrics"
Metrics.registerDestructor () ->
clearInterval(interval)
gaugeOpenSockets: () ->
Metrics = require "./metrics"
for url, agents of require('http').globalAgent.sockets
url = URL.parse("http://#{url}")
hostname = url.hostname?.replace(/\./g, "_")
Metrics.gauge "open_connections.http.#{hostname}", agents.length
for url, agents of require('https').globalAgent.sockets
url = URL.parse("https://#{url}")
hostname = url.hostname?.replace(/\./g, "_")
Metrics.gauge "open_connections.https.#{hostname}", agents.length