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fix(phaser-assets): use a monotonic preparation deadline - #195
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The whole pack-preparation budget now runs on one monotonic clock (performance.now) instead of Date.now, so a system clock correction mid-prepare can neither extend nor prematurely exhaust the prepareTimeoutMs budget: - The deadline is computed once per prepare on the monotonic clock and never restarted by a later archive; stagePack's remainder reads the same clock, and the fractional remainder is floored to the decoder's integer deadline contract only after the spent check, so rounding can never mint budget. - No new archive request or decode starts once the monotonic clock says the budget is spent, even when the abort timer's callback is still queued. - A decode that resolves after the budget is spent no longer earns staging handles: the final acceptance gate re-checks the budget and the abort state before handles are acquired. prepareTimeoutMs, requestTimeoutMs and the #191 decode deadline keep their existing responsibilities; user-cancel, dispose and deadline causes stay distinct. Tests drive a manual monotonic clock with gated downloads and a step-driven worker, covering forward and backward wall-clock jumps, one shared budget across dependency archives, download time reducing the decoder budget, zero decode posts after the budget is spent, refusal of success handles on a late decode, and the existing cancel/dispose/files-only regressions.
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🧭 Changeset detectedMerging this PR will release the following updates: @mpgd/phaser-assets (npm) — patch version bumpPatch changes
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📝 WalkthroughWalkthroughPack preparation now uses one ChangesDelivery deadline enforcement
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant DeliveryPreparation
participant MonotonicClock
participant HTTPOrigin
participant ZIPDecoder
participant Staging
DeliveryPreparation->>MonotonicClock: read elapsed prepare time
DeliveryPreparation->>HTTPOrigin: request archive while budget remains
HTTPOrigin-->>DeliveryPreparation: archive response
DeliveryPreparation->>MonotonicClock: calculate remaining budget
DeliveryPreparation->>ZIPDecoder: decode with floored remaining deadline
ZIPDecoder-->>DeliveryPreparation: decode result
DeliveryPreparation->>MonotonicClock: verify deadline before success
DeliveryPreparation->>Staging: retain handles only when budget remains
Merge Risk: 🔵 Low · up to A slow URL resolver can allow an archive request to start after the configured preparation budget expires. This is a bounded timeout-contract gap that should be fixed before release. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@packages/phaser-assets/src/delivery.ts`:
- Line 1184: The archive-request flow around stagePack must recheck the budget
after the synchronous resolveURL callback and immediately before
fetchDeliveryBytes, so a callback that advances time cannot start an expired
request; add a regression test with resolveURL advancing the fake monotonic
clock past the deadline.
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.sampo/changesets/delivery-monotonic-deadline.mddocs/ASSET_PACK_DELIVERY.mdpackages/phaser-assets/README.mdpackages/phaser-assets/src/delivery.tspackages/phaser-assets/test/delivery.test.ts
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The pre-request budget gate ran before stagePack invoked the synchronous resolveURL callback, so user code in the resolver could spend the remaining budget while the archive request still started. The gate now sits immediately before the request it guards, after URL resolution, and a regression test advances the fake monotonic clock inside resolveURL: zero archive requests and zero decode posts, deadline failure.
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The gated test origin now answers with Connection: close so each phase-gated download uses a fresh connection — a pooled socket reused across gates added runner-dependent transport behavior the test does not measure and intermittently failed the second fetch on CI. The prepare settles through an always-handled wrapper so any transport failure fails the final assertion loudly instead of floating as an unhandled rejection while a gate wait spins.
Summary
The whole pack-preparation budget now runs on one monotonic clock (
performance.now) instead ofDate.now, so a system clock correction mid-preparecan neither extend nor prematurely exhaust theprepareTimeoutMsbudget. Existing responsibilities are preserved:prepareTimeoutMsstill covers one whole prepare,requestTimeoutMsstill ends with each HTTP body, the #191 decoder still owns its own deadline, and user-cancel / dispose / deadline causes stay distinct.Time base and boundaries
preparecall,deadlineAt = monotonicNow() + prepareTimeoutMs; never restarted when staging moves to the next archive.Date.now()(none exist in the budget path).loader.acquire's image-preparation time stays a separate API, as before.Verification
pnpm check(incl.validate:public) green; phaser-assets suites 316/316 green; the examples/asset-packs browser cancellation/deadline suite passes (one rerun: a known load-dependent Playwright waitForFunction flake on this machine, unrelated to the change — no fake clock in that suite and both clocks advance identically in real time).deadlinefailure;Changeset
.sampo/changesets/delivery-monotonic-deadline.md—@mpgd/phaser-assetspatch (runtime behavior change).No worker protocol, codec, retry, scheduler, cache or delivery refactor changes; no game repositories touched.
Summary by CodeRabbit
Bug Fixes
Documentation