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

2026-06-04 08:56:32 +00:00
parent bebe2353de
commit 0fa8478319
3 changed files with 35 additions and 0 deletions
@@ -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));
+
+// 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);
+})();