48 lines
4.3 KiB
JavaScript
48 lines
4.3 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.parallelPromises = parallelPromises;
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/**
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* Run a number of promise generators with max parallelism
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*
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* Order is not maintained between the input and output.
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*/
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async function parallelPromises(n, promises) {
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const ret = new Array();
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let count = 0;
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let error;
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const queue = [...promises];
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return new Promise((ok, ko) => {
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tick();
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function tick() {
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if (count === 0 && error) {
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ko(error);
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return;
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}
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if (count === 0 && queue.length === 0) {
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ok(ret);
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return;
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}
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while (count < n && queue.length > 0 && !error) {
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const next = queue.shift();
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if (next !== undefined) {
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start(next);
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}
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}
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}
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function start(fn) {
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count += 1;
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fn()
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.then((result) => {
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ret.push(result);
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})
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.catch((e) => {
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error = e;
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})
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.finally(() => {
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count -= 1;
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tick();
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});
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}
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});
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}
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