52 lines
1.2 KiB
TypeScript
52 lines
1.2 KiB
TypeScript
import { pause } from './schedulers';
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type PendingDownload = {
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url: string;
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filename: string;
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};
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// Chrome prevents more than 10 downloads per second
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const LIMIT_PER_BATCH = 10;
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const BATCH_INTERVAL = 1000;
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let pendingDownloads: PendingDownload[] = [];
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let planned = false;
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export default function download(url: string, filename: string) {
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pendingDownloads.push({ url, filename });
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if (!planned) {
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planned = true;
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setTimeout(async () => {
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await processQueue();
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planned = false;
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}, BATCH_INTERVAL);
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}
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}
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async function processQueue() {
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let count = 0;
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for (const pendingDownload of pendingDownloads) {
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downloadOne(pendingDownload);
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count++;
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if (count === LIMIT_PER_BATCH) {
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await pause(BATCH_INTERVAL);
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count = 0;
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}
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}
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pendingDownloads = [];
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}
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function downloadOne({ url, filename }: PendingDownload) {
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const link = document.createElement('a');
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link.href = url;
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link.target = '_blank';
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link.rel = 'noopener noreferrer';
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link.download = filename;
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try {
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link.click();
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} catch (err) {
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// eslint-disable-next-line no-console
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console.error(err); // Suppress redundant "Blob loading failed" error popup on IOS
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}
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}
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