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files >> //opt/alt/alt-nodejs16/root/usr/lib/node_modules/npm/lib/utils/timers.js
const EE = require('events') const { resolve } = require('path') const fs = require('@npmcli/fs') const log = require('./log-shim') const _timeListener = Symbol('timeListener') const _timeEndListener = Symbol('timeEndListener') const _init = Symbol('init') // 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 ({ dir } = {}) { if (dir) { this.file = resolve(dir, '_timing.json') } } writeFile (fileData) { if (!this.file) { return } try { const globalStart = this.started const globalEnd = this.#finished.npm || Date.now() const content = { ...fileData, ...this.#finished, // add any unfinished timers with their relative start/end unfinished: [...this.#unfinished.entries()].reduce((acc, [name, start]) => { acc[name] = [start - globalStart, globalEnd - globalStart] return acc }, {}), } // we append line delimited json to this file...forever // XXX: should we also write a process specific timing file? // with similar rules to the debug log (max files, etc) fs.withOwnerSync( this.file, () => fs.appendFileSync(this.file, JSON.stringify(content) + '\n'), { owner: 'inherit' } ) } 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
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