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fix(stylesheet): warm and reuse the server PDF preflight worker

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The server PDF preflight spawned a fresh worker per semantic-CSS edit, each
racing a 15s startup deadline to cold-load the ~721kB+5MB PDF runtime. That
load is super-linear in CPU (~3s at 1 vCPU, >15s on a throttled/shared vCPU),
so on a constrained box every edit hit the startup-timeout path and returned
STYLESHEET_PREFLIGHT_WORKER_FAILED. Since the service only advances the applied
stylesheet when preflight passes, custom styles never applied and the editor
stuck on Checking.

Warm one worker at boot and reuse it (message-based input, respawn on
crash/timeout), so the cold load is paid once instead of per edit. Raise the
render deadline 5s->30s (a rich resume renders ~5-18s on a slow box) and the
readiness ceiling to 120s so the one-time warm completes even when throttled.
Surface worker load failures instead of an unhandled-rejection crash, and log
runner-side failure paths so the previously opaque failure is diagnosable.
Verified in node:24-slim under --cpus=0.25/0.35/0.5: all reused requests pass.

Claude-Session: https://claude.ai/code/session_01ULhhLQ24DvnYwzP4afDuye
This commit is contained in:
Amruth Pillai
2026-08-09 14:30:55 +02:00
parent 88a19619da
commit e6a31aab97
5 changed files with 379 additions and 159 deletions
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packages/pdf/src/semantic/preflight-reference.ts
+4 -1
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@@ -40,7 +40,10 @@ export const PDF_PREFLIGHT_DIAGNOSTIC_CATALOG = {
export type PdfPreflightFailureCode = keyof typeof PDF_PREFLIGHT_DIAGNOSTIC_CATALOG;
export const STYLESHEET_PREFLIGHT_LIMITS = Object.freeze({
timeoutMs: 5_000,
// Render deadline (after the worker is warm). A rich resume on a throttled/shared
// vCPU renders in ~5-18s, so 5s spuriously failed real resumes; the worker is now
// warmed+reused so this ceiling only bounds a genuinely stuck render.
timeoutMs: 30_000,
maxPages: 20,
maxBytes: 10_000_000,
maxPageWidthPt: 2_000,