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make promises parallel

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wlgs 2024-09-24 23:15:05 +02:00
parent 4df0457ab1
commit d0eae6a1dc
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1 changed files with 16 additions and 10 deletions
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26
mkbsd.js
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@ -6,9 +6,6 @@ const path = require(`path`);
async function main() { async function main() {
const url = 'https://storage.googleapis.com/panels-api/data/20240916/media-1a-i-p~s'; const url = 'https://storage.googleapis.com/panels-api/data/20240916/media-1a-i-p~s';
const delay = (ms) => {
return new Promise(resolve => setTimeout(resolve, ms));
}
try { try {
const response = await fetch(url); const response = await fetch(url);
if (!response.ok) { if (!response.ok) {
@ -25,21 +22,29 @@ async function main() {
console.info(`📁 Created directory: ${downloadDir}`); console.info(`📁 Created directory: ${downloadDir}`);
} }
let fileIndex = 1; let fileIndex = 1;
const promises = [];
for (const key in data) { for (const key in data) {
const subproperty = data[key]; const subproperty = data[key];
if (subproperty && subproperty.dhd) { if (subproperty && subproperty.dhd) {
const imageUrl = subproperty.dhd; const imageUrl = subproperty.dhd;
console.info(`🔍 Found image URL!`);
await delay(100);
const ext = path.extname(new URL(imageUrl).pathname) || '.jpg'; const ext = path.extname(new URL(imageUrl).pathname) || '.jpg';
const filename = `${fileIndex}${ext}`; const filename = `${fileIndex}${ext}`;
const filePath = path.join(downloadDir, filename); const filePath = path.join(downloadDir, filename);
await downloadImage(imageUrl, filePath); promises.push(downloadImage(imageUrl, filePath));
console.info(`🖼️ Saved image to ${filePath}`);
fileIndex++; fileIndex++;
await delay(250);
} }
} }
console.info(`📥 Downloading ${promises.length} images...`);
const startTime = Date.now();
const results = await Promise.allSettled(promises);
const endTime = Date.now();
const duration = (endTime - startTime) / 1000;
const successCount = results.filter((result) => result.status === 'fulfilled').length;
const failureCount = results.length - successCount;
console.info(`✅ Downloaded ${successCount} images in ${duration} seconds.`);
if (failureCount > 0) {
console.warn(`❌ Failed to download ${failureCount} images.`);
}
} catch (error) { } catch (error) {
console.error(`Error: ${error.message}`); console.error(`Error: ${error.message}`);
} }
@ -52,7 +57,8 @@ async function downloadImage(url, filePath) {
} }
const arrayBuffer = await response.arrayBuffer(); const arrayBuffer = await response.arrayBuffer();
const buffer = Buffer.from(arrayBuffer); const buffer = Buffer.from(arrayBuffer);
await fs.promises.writeFile(filePath, buffer); console.info(`📄 Downloaded image: ${filePath}`);
return fs.promises.writeFile(filePath, buffer);
} }
function asciiArt() { function asciiArt() {
@ -71,5 +77,5 @@ function asciiArt() {
(() => { (() => {
asciiArt(); asciiArt();
setTimeout(main, 5000); setTimeout(main, 1000);
})(); })();