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const EE = require('events')
const fs = require('fs')
const log = require('./log-shim')
// This is an event emiiter but on/off
// only listen on a single internal event that gets
// emitted whenever a timer ends
class Timers extends EE {
file = null
#unfinished = new Map()
#finished = {}
#onTimeEnd = Symbol('onTimeEnd')
#initialListener = null
#initialTimer = null
constructor ({ listener = null, start = 'npm' } = {}) {
super()
this.#initialListener = listener
this.#initialTimer = start
this.#init()
}
get unfinished () {
return this.#unfinished
}
get finished () {
return this.#finished
}
#init () {
this.on()
if (this.#initialListener) {
this.on(this.#initialListener)
}
process.emit('time', this.#initialTimer)
this.started = this.#unfinished.get(this.#initialTimer)
}
on (listener) {
if (listener) {
super.on(this.#onTimeEnd, listener)
} else {
process.on('time', this.#timeListener)
process.on('timeEnd', this.#timeEndListener)
}
}
off (listener) {
if (listener) {
super.off(this.#onTimeEnd, listener)
} else {
this.removeAllListeners(this.#onTimeEnd)
process.off('time', this.#timeListener)
process.off('timeEnd', this.#timeEndListener)
}
}
time (name, fn) {
process.emit('time', name)
const end = () => process.emit('timeEnd', name)
if (typeof fn === 'function') {
const res = fn()
return res && res.finally ? res.finally(end) : (end(), res)
}
return end
}
load ({ path } = {}) {
if (path) {
this.file = `${path}timing.json`
}
}
writeFile (metadata) {
if (!this.file) {
return
}
try {
const globalStart = this.started
const globalEnd = this.#finished.npm || Date.now()
const content = {
metadata,
timers: this.#finished,
// add any unfinished timers with their relative start/end
unfinishedTimers: [...this.#unfinished.entries()].reduce((acc, [name, start]) => {
acc[name] = [start - globalStart, globalEnd - globalStart]
return acc
}, {}),
}
fs.writeFileSync(this.file, JSON.stringify(content) + '\n')
} catch (e) {
this.file = null
log.warn('timing', `could not write timing file: ${e}`)
}
}
#timeListener = (name) => {
this.#unfinished.set(name, Date.now())
}
#timeEndListener = (name) => {
if (this.#unfinished.has(name)) {
const ms = Date.now() - this.#unfinished.get(name)
this.#finished[name] = ms
this.#unfinished.delete(name)
this.emit(this.#onTimeEnd, name, ms)
} else {
log.silly('timing', "Tried to end timer that doesn't exist:", name)
}
}
}
module.exports = Timers