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test(assets): validate persistent artifact reuse across reloads - #198
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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.
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.
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.
…details Add delivery.subscribe(listener) as the single observation surface for pack delivery work. Listeners receive prepare and files-delivery read events carrying an operationId (unique per operation within the delivery's lifetime), the operation kind, per-operation sequencing, pack and asset context, the observed phase (planning, downloading, decoding-and-verifying, and exactly one terminal of prepared/completed, failed, cancelled or disposed) and strictly measured progress: network body bytes against the manifest's declared size, verified entry counts and byte totals. Internal hashing/inflate percentages are not observable through the #191 contract and are never fabricated; absent fields mean unknown and per-stage numbers never merge into one synthetic percent. Observation is containment-safe: throwing or rejecting listeners never change results and are never awaited, unsubscribe is idempotent, terminals fire exactly once per operation, and late events from superseded operations are dropped. Files-only prepare stays a light two-event operation (prepared means staging, never images loaded), and staged-entry local reads emit nothing, keeping origin downloads and local reads distinguishable. PhaserPackDeliveryError gains an additive optional details field (stage, operationId, pack/asset identity, httpStatus, decoderStatus/decoderCode, expectedBytes/receivedBytes) captured at the failing execution point; codes, messages and existing constructor calls are unchanged, and no URL or response data ever enters events or details. readCappedDeliveryBody accepts an optional onBodyBytes observation hook. The kit example surfaces the observed phases and numbers beside the loader's own texture progress, keeps stale operation events from overwriting new selections, unsubscribes on scene shutdown (distinct from an explicit cancel), and formats failures from the structured details; the browser acceptance asserts staging observation is distinct from texture readiness.
- The prepare boundary no longer overwrites pack identity the failing
site recorded: a dependency archive failure keeps naming that
dependency in details (regression covered), while correlation fields
still merge in.
- The unsupported worker-environment failure maps to its documented
decoderStatus ('unsupported', not 'error'), and a worker-error decode
failure records decoderStatus 'worker-error'; core digest failures
still leave decoderStatus absent (unknown), per the
absent-means-unknown contract.
- The kit sample renders delivery failures from the stable fields only
(code plus structured details), never message text, and the browser
acceptance matches that display.
- Published docs describe the bounded ZIP decoder instead of the opaque
internal PR number.
Add delivery.inspectPreparation(packId): a read-only cost plan for a pack and its dependency closure, derived from the manifest snapshot and the current staging state. It starts nothing, acquires nothing, reserves nothing, and touches no network, cache, worker or timer. The plan distinguishes the requested pack and revision, the dependency-first closure, per-pack cold artifacts (one object per ZIP archive — entries are not download objects — and one per files-delivery file), the cold object count and manifest body-bytes sum (assuming no caches; not wire bytes), the ZIP packs already staged versus the ones a prepare would stage, the additional staging reservation under the current archive-plus-expanded policy, current and projected staging usage against the configured budget with fitsBudget, and the busy state. Duplicate artifacts follow the manifest's identity rules, a files-only closure reports zero ZIP cost while keeping its full cold file cost, resident textures are never inspected, byte sums are overflow-checked, and the accountingModel identifier pins that the reservation covers staging only — not transport copies, decoder internals, decoded pixels or GPU memory. inspectPreparation and prepare's budget admission share one pure planner (closure + staged set + usage + budget in, plan out), so the published numbers and the enforced admission cannot drift; an inspection is never a reservation. The kit example computes the plan once per selection and shows packs, artifact bytes, projected staging and budget fit next to the observed delivery phases; the browser acceptance asserts the displayed plan agrees with the prepare outcome in both the fits and the one-byte-over budget scenarios.
Private example-only experiment: verified artifact bytes (files-delivery files and ZIP archives) persist in a dedicated IndexedDB namespace and re-serve to the unchanged public delivery through managed Blob URLs. - Identity is content-derived and host-independent (namespace|sha256|digest|bytes); MIME and roles always come from the current manifest. Records carry schemaVersion plus minimal metadata; no single verified boolean is a trust basis. - Writes fetch and verify under finite size/deadline caps first, then commit payload+metadata atomically in one short readwrite transaction; stored requires the transaction complete event. Aborts and quota failures preserve previous good records and report honestly. Reads re-verify size and digest against the current manifest; corrupt or metadata-tampered records miss and are dropped, and cache hits still pass through the existing decoder and loader. - The bridge is experiment-only: the async warm phase finishes all IndexedDB work before prepare, resolveURL performs only synchronous Blob URL lookups with origin fallback, and Blob URLs are revoked on unload/shutdown/next selection. No fetch monkeypatching, no Service Worker, no loader/decoder copies, no integrity bypass. - Browser acceptance (real Chromium IndexedDB, same-origin reloads): HTTP-only baseline vs cold vs warm comparisons with controlled no-store artifact fetches (warm reload: zero origin artifact GETs), duplicate-store idempotency, payload/digest/size tamper detection, explicit deletion, delete-vs-late-write race with a delayed origin fetch, quota and unavailable fault injection, transaction-abort preservation with foreign-namespace isolation, and the regular Phaser frame/transition/texture-release regressions under the bridge. Per-artifact timings land in evidence.json. Example and tests only — no public package changes, no changeset.
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🧭 Changeset detectedMerging this PR will release the following updates: @mpgd/phaser-assets (npm) — minor version bumpMinor changes
Patch changes
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📝 WalkthroughWalkthroughThe pull request adds delivery observability, preparation-cost inspection, monotonic deadline enforcement, structured error details, and an IndexedDB artifact-reuse experiment with lifecycle integration and browser acceptance coverage. ChangesPack delivery and artifact reuse
Priority: ➖ Normal Estimated code review effort: 5 (Critical) | ~90 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ExampleApp
participant PhaserPackDelivery
participant ArtifactCache
participant IndexedDB
participant Origin
ExampleApp->>PhaserPackDelivery: inspectPreparation and prepare
PhaserPackDelivery-->>ExampleApp: plan and delivery events
ExampleApp->>ArtifactCache: warm cold artifacts
ArtifactCache->>IndexedDB: read or write verified bytes
ArtifactCache->>Origin: fetch cache misses
ArtifactCache-->>ExampleApp: cache outcomes and Blob URLs
ExampleApp->>PhaserPackDelivery: resolve cached or origin URLs
Merge Risk: 🔵 Low · up to The opt-in cache experiment remains usable, but several bounded reliability and cleanup defects should be corrected to avoid delayed selections, excessive memory use, unnecessary origin fetches, and missed acceptance-test failures. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 5 files. (6 skipped: 6 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 6
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Inline comments:
In `@examples/asset-packs/src/artifact-cache.ts`:
- Line 324: Update the write logic in warmOne so the existing record for the
same identity is read within the same transaction before updating USAGE_KEY.
Apply only the size delta, artifact.bytes minus the existing record’s bytes,
when replacing a record; retain the full artifact.bytes increment for new
records and preserve the MAX_TOTAL_BYTES limit check.
- Around line 287-289: Update fetchOrigin to avoid loading the entire response
via response.arrayBuffer(); read the response body as a stream, track
accumulated bytes, and cancel the stream immediately when the total exceeds
artifact.bytes or MAX_OBJECT_BYTES. Preserve the existing SHA-256 and byte-count
verification for responses within the limit.
In `@examples/asset-packs/src/main.ts`:
- Line 466: Update the ArtifactCache lifecycle around initDelivery replacement,
scene shutdown, and stale initialization so obsolete instances are closed and
cleared, not merely revoked via revokeAll(). Ensure a cache created by a stale
initDelivery() is also closed before returning, while keeping the cache open in
the unload handler because delivery is retained for reuse.
- Around line 514-515: Update the manifest metadata extraction around
manifestPacks and artifactMeta so it does not access packs before
createPhaserPackDelivery validates the manifest and reports invalid input as
PhaserPackDeliveryError with code config. Move extraction after successful
delivery creation and run it only when persistentCache is enabled, preserving
cache warming behavior without processing metadata when caching is disabled.
- Line 421: Update the enter() cache-warming flow and ArtifactCache.warm to
accept and honor the active abort signal: stop warming between artifacts,
combine the signal with each fetch timeout, and revoke any Blob URLs created
when warming becomes stale before returning. Preserve the existing
stale-operation checks and ensure the next selection is not delayed by canceled
warming.
In `@examples/asset-packs/test/browser.mjs`:
- Line 613: Update the console listener registered by the cachePage flow to
append error messages to the existing cacheErrors collection instead of the
out-of-scope errors variable, preserving the final cache error assertion.
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.sampo/changesets/delivery-monotonic-deadline.md.sampo/changesets/delivery-progress-details.md.sampo/changesets/inspect-pack-preparation.mddocs/ASSET_PACK_DELIVERY.mdexamples/asset-packs/README.mdexamples/asset-packs/src/artifact-cache.tsexamples/asset-packs/src/main.tsexamples/asset-packs/test/browser.mjspackages/phaser-assets/README.mdpackages/phaser-assets/src/delivery.tspackages/phaser-assets/test/delivery.test.ts
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- Bound the acquisition body: the origin response is read as a stream and cancelled the moment it passes the manifest-declared size, so an oversized origin reply never buffers whole in memory first. - Usage accounting handles replacement writes: the existing record is read inside the same write transaction and only the byte delta grows the total, so re-storing the same identity cannot inflate usage toward the cap. - Warm accepts the enter operation's abort signal: it stops between artifacts, in-flight fetches observe the signal through a combined deadline, and Blob URLs created by a stale warm are revoked instead of lingering for a superseded selection. - The IndexedDB connection closes on boot replacement, scene shutdown and stale initDelivery returns; the unload handler keeps it open with the delivery it still serves. - Cache warm inputs are extracted only after the delivery validated the manifest, so the metadata cast reads a shape the public API already accepted. - Cache-page console errors collect into their own list.
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Summary
Private, example-only experiment (PR 4 of the series; stacked on #197/#196/#195): verified artifact bytes — files-delivery files and ZIP archives — persist in a dedicated IndexedDB namespace and re-serve to the unchanged public delivery through managed Blob URLs. No public package changes, no changeset, no loader/decoder reimplementation, no fetch patching, no Service Worker, no integrity bypass.
Storage model (
examples/asset-packs/src/artifact-cache.ts):namespace | sha256 | expectedDigest | expectedBytes— host/path-independent. MIME/roles from the current manifest, never from stored records. Records carryschemaVersion+ minimal metadata; no single boolean is a trust basis.storedrequires txcomplete. Network/crypto never inside a tx. Quota (injected) and abort faults keep previous good records and reportorigin-store-failedhonestly. Caps: 32 MiB/object, 96 MiB total (skip, explicit outcome).Experiment-only bridge: warm phase (async) completes all IDB work before
prepare;resolveURLdoes only synchronous Blob URL lookups with origin fallback; Blob URLs revoked on unload/shutdown/next selection. Bounded DB open/read/write deadlines degrade tocache-unavailable(origin path) instead of hanging; late connections close on versionchange.Acceptance (real Chromium IndexedDB, same-origin reloads,
?idcache=1):no-storeartifact fetches: HTTP-only baseline reload = 2 origin GETs; cold = 2 GETs + stores; warm reload = 0 origin GETs (Blob URL fetches never reach the origin counter).artifacts/browser/evidence.json(baselineHttpOnly,persistentReuse): per-artifact fetch/write/cache-read/verify/Blob timings. On this machine warm cache reads are sub-15 ms with ~0.3 ms Blob linking; cold adds a ~0.5-2 ms store per artifact. No speed win is claimed — the experiment's value is reload reuse, explicit deletion and network-free file supply.Verdict for the follow-up cache PR
Storage stability and existing lifetimes held up across every scenario (no partial records, no stale reuse, no lifetime regressions), so nothing here blocks the follow-up: moving this minimal store to the real acquisition boundary. The Blob URL bridge stays experiment-only and is not product structure.
Verification
Full browser acceptance passes (one known load-dependent Playwright flake needed reruns, unrelated lines);
pnpm check(incl. validate:public) green; phaser-assets suite 339/339 (public behavior untouched); localocr review0 findings. Release PR #189 untouched.Summary by CodeRabbit
New Features
Bug Fixes
Documentation