Monorepo for Aesthetic.Computer
aesthetic.computer
fix(keep): add SSE heartbeat to prevent thumbnail idle timeout loop
The oven thumbnail generation (20-45s) left the SSE connection idle,
causing Netlify infra to kill it. Client retried endlessly.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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system/netlify/functions/keep-mint.mjs
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system/netlify/functions/keep-mint.mjs
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// ═══════════════════════════════════════════════════════════════════
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if (!useCachedMedia) {
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await send("progress", { stage: "thumbnail", message: `Awaiting ${thumbW}x${thumbH}@2x WebP...` });
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const thumbResult = await thumbnailPromise;
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// Send heartbeat messages to keep the SSE connection alive while
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// the oven generates the thumbnail (can take 20-45s).
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const heartbeat = setInterval(async () => {
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try {
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const elapsed = ((Date.now() - processStartTime) / 1000).toFixed(0);
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await send("progress", { stage: "thumbnail", message: `Still baking… (${elapsed}s)` });
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} catch {}
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}, 10000);
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let thumbResult;
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try {
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thumbResult = await thumbnailPromise;
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} finally {
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clearInterval(heartbeat);
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}
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if (!thumbResult?.ipfsUri) {
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const errorMsg = thumbResult?.error || "unknown error";