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Cache-Warming: Bilder beim Serverstart vorab laden (sofortiges Erst-Rendering)

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Till Heidrich
2026-06-04 08:56:32 +00:00
parent bebe2353de
commit 0fa8478319
3 changed files with 35 additions and 0 deletions
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Dockerfile
+1
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@@ -2,6 +2,7 @@ FROM node:20-alpine
WORKDIR /app WORKDIR /app
COPY package.json ./ COPY package.json ./
COPY server.js ./ COPY server.js ./
COPY warm-urls.json ./
COPY public ./public COPY public ./public
RUN mkdir -p /data RUN mkdir -p /data
ENV PORT=80 ENV PORT=80
server.js
+17
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@@ -125,3 +125,20 @@ const server = http.createServer(async (req, res) => {
}); });
server.listen(PORT, () => console.log('Reise-Vergleich läuft auf Port ' + PORT + ' | Daten: ' + DATA_FILE)); server.listen(PORT, () => console.log('Reise-Vergleich läuft auf Port ' + PORT + ' | Daten: ' + DATA_FILE));
// Prefetch all hotel/cruise images into the proxy cache so the first visit is instant.
(async () => {
let list = [];
try { list = JSON.parse(fs.readFileSync(path.join(__dirname, 'warm-urls.json'), 'utf8')); }
catch (e) { return; }
for (const u of list) {
try {
const host = new URL(u).host;
if (!hostAllowed(host) || imgCache.has(u)) continue;
const referer = host.endsWith('ahoi-schiff.de') ? 'https://www.ahoi-schiff.de/' : 'https://urlaub.check24.de/';
const r = await fetch(u, { headers: { 'Referer': referer, 'User-Agent': 'Mozilla/5.0 (compatible; HeidrichReise/1.0)', 'Accept': 'image/*' } });
if (r.ok) imgCache.set(u, { buf: Buffer.from(await r.arrayBuffer()), type: r.headers.get('content-type') || 'image/jpeg' });
} catch (e) { /* skip */ }
}
console.log('Bild-Cache vorgewärmt:', imgCache.size + '/' + list.length);
})();
warm-urls.json
+17
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@@ -0,0 +1,17 @@
[
"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy8zNDAwMDAwMC8zMzYzMDAwMC8zMzYyNTkwMC8zMzYyNTg1OC9iM2EyNzQxY193LmpwZw==!07717e/picture.jpg",
"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9ob3RlbGltYWdlcy5zdW5ob3RlbHMubmV0L0hvdGVsSW5mby9ob3RlbEltYWdlLmFzcHg-aWQ9MTYxODE3MjUmZnVsbD0x!cc720d/picture.jpg",
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"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cDovL3Bob3Rvcy5ob3RlbGJlZHMuY29tL2dpYXRhL29yaWdpbmFsLzAwLzAwNTUyOS8wMDU1MjlhX2hiX2FfMDIzLmpwZw==!406b07/picture.jpg",
"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy83MDAwMDAwLzYxNTAwMDAvNjE0MTgwMC82MTQxNzIzLzI5YmZiMjE0X3cuanBn!da02c7/picture.jpg",
"https://cdn1.urlaub.check24.de/size=625c440/di=3/nfc=200/source=aHR0cHM6Ly9pLnRyYXZlbGFwaS5jb20vbG9kZ2luZy8xMDAwMDAwLzkzMDAwMC85MjI0MDAvOTIyMzE5Lzg3YjE3ODc3X3ouanBn!d36a31/picture.jpg",
"https://files.ahoi-schiff.de/aida-cruises/s/aidacosma.webp"
]