overleaf/libraries/metrics/index.js

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/* eslint-disable no-console */
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const ExpressCompression = require('compression')
const promClient = require('prom-client')
const promWrapper = require('./prom_wrapper')
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const destructors = []
require('./uv_threadpool_size')
function registerDestructor(func) {
destructors.push(func)
}
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function injectMetricsRoute(app) {
app.get(
'/metrics',
ExpressCompression({
level: parseInt(process.env.METRICS_COMPRESSION_LEVEL || '1', 10),
}),
function (req, res, next) {
res.set('Content-Type', promWrapper.registry.contentType)
promWrapper.registry
.metrics()
.then(metrics => {
res.end(metrics)
})
.catch(err => {
next(err)
})
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}
)
}
function buildPromKey(key) {
return key.replace(/[^a-zA-Z0-9]/g, '_')
}
function sanitizeValue(value) {
return parseFloat(value)
}
function set(key, value, sampleRate = 1) {
console.log('counts are not currently supported')
}
function inc(key, sampleRate = 1, labels = {}) {
if (arguments.length === 2 && typeof sampleRate === 'object') {
labels = sampleRate
}
key = buildPromKey(key)
promWrapper.metric('counter', key, labels).inc(labels)
if (process.env.DEBUG_METRICS) {
console.log('doing inc', key, labels)
}
}
function count(key, count, sampleRate = 1, labels = {}) {
if (arguments.length === 3 && typeof sampleRate === 'object') {
labels = sampleRate
}
key = buildPromKey(key)
promWrapper.metric('counter', key, labels).inc(labels, count)
if (process.env.DEBUG_METRICS) {
console.log('doing count/inc', key, labels)
}
}
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function summary(key, value, labels = {}) {
key = buildPromKey(key)
promWrapper.metric('summary', key, labels).observe(labels, value)
if (process.env.DEBUG_METRICS) {
console.log('doing summary', key, value, labels)
}
}
function timing(key, timeSpan, sampleRate = 1, labels = {}) {
if (arguments.length === 3 && typeof sampleRate === 'object') {
labels = sampleRate
}
key = buildPromKey('timer_' + key)
promWrapper.metric('summary', key, labels).observe(labels, timeSpan)
if (process.env.DEBUG_METRICS) {
console.log('doing timing', key, labels)
}
}
function histogram(key, value, buckets, labels = {}) {
key = buildPromKey('histogram_' + key)
promWrapper.metric('histogram', key, labels, buckets).observe(labels, value)
if (process.env.DEBUG_METRICS) {
console.log('doing histogram', key, buckets, labels)
}
}
class Timer {
constructor(key, sampleRate = 1, labels = {}, buckets = undefined) {
if (typeof sampleRate === 'object') {
// called with (key, labels, buckets)
if (arguments.length === 3) {
buckets = labels
labels = sampleRate
}
// called with (key, labels)
if (arguments.length === 2) {
labels = sampleRate
}
sampleRate = 1 // default value to pass to timing function
}
this.start = new Date()
key = buildPromKey(key)
this.key = key
this.sampleRate = sampleRate
this.labels = labels
this.buckets = buckets
}
// any labels passed into the done method override labels from constructor
done(labels = {}) {
const timeSpan = new Date() - this.start
if (this.buckets) {
histogram(this.key, timeSpan, this.buckets, { ...this.labels, ...labels })
} else {
timing(this.key, timeSpan, this.sampleRate, { ...this.labels, ...labels })
}
return timeSpan
}
}
function gauge(key, value, sampleRate = 1, labels = {}) {
if (arguments.length === 3 && typeof sampleRate === 'object') {
labels = sampleRate
}
key = buildPromKey(key)
promWrapper.metric('gauge', key, labels).set(labels, sanitizeValue(value))
if (process.env.DEBUG_METRICS) {
console.log('doing gauge', key, labels)
}
}
function globalGauge(key, value, sampleRate = 1, labels = {}) {
key = buildPromKey(key)
labels = { host: 'global', ...labels }
promWrapper.metric('gauge', key, labels).set(labels, sanitizeValue(value))
}
function close() {
for (const func of destructors) {
func()
}
}
module.exports.registerDestructor = registerDestructor
module.exports.injectMetricsRoute = injectMetricsRoute
module.exports.buildPromKey = buildPromKey
module.exports.sanitizeValue = sanitizeValue
module.exports.set = set
module.exports.inc = inc
module.exports.count = count
module.exports.summary = summary
module.exports.timing = timing
module.exports.histogram = histogram
module.exports.Timer = Timer
module.exports.gauge = gauge
module.exports.globalGauge = globalGauge
module.exports.close = close
module.exports.prom = promClient
module.exports.register = promWrapper.registry
module.exports.http = require('./http')
module.exports.open_sockets = require('./open_sockets')
module.exports.leaked_sockets = require('./leaked_sockets')
module.exports.event_loop = require('./event_loop')
module.exports.memory = require('./memory')
module.exports.mongodb = require('./mongodb')