89 lines
1.9 KiB
JavaScript
89 lines
1.9 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.readFile = readFile;
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exports.stat = stat;
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exports.throttleAll = throttleAll;
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function stat(inputFileSystem, path) {
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return new Promise((resolve, reject) => {
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inputFileSystem.stat(path, (err, stats) => {
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if (err) {
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reject(err);
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}
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resolve(stats);
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});
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});
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}
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function readFile(inputFileSystem, path) {
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return new Promise((resolve, reject) => {
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inputFileSystem.readFile(path, (err, stats) => {
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if (err) {
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reject(err);
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}
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resolve(stats);
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});
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});
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}
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const notSettled = Symbol(`not-settled`);
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/**
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* Run tasks with limited concurency.
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* @template T
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* @param {number} limit - Limit of tasks that run at once.
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* @param {Task<T>[]} tasks - List of tasks to run.
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* @returns {Promise<T[]>} A promise that fulfills to an array of the results
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*/
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function throttleAll(limit, tasks) {
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if (!Number.isInteger(limit) || limit < 1) {
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throw new TypeError(`Expected \`limit\` to be a finite number > 0, got \`${limit}\` (${typeof limit})`);
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}
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if (!Array.isArray(tasks) || !tasks.every(task => typeof task === `function`)) {
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throw new TypeError(`Expected \`tasks\` to be a list of functions returning a promise`);
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}
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return new Promise((resolve, reject) => {
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const result = Array(tasks.length).fill(notSettled);
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const entries = tasks.entries();
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const next = () => {
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const {
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done,
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value
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} = entries.next();
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if (done) {
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const isLast = !result.includes(notSettled);
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if (isLast) {
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resolve(
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/** @type{T[]} **/
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result);
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}
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return;
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}
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const [index, task] = value;
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/**
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* @param {T} x
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*/
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const onFulfilled = x => {
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result[index] = x;
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next();
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};
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task().then(onFulfilled, reject);
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};
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Array(limit).fill(0).forEach(next);
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});
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} |