feat: offline store foundation — manifest, snapshots, refcounted delete (offline phase 1/6) #84
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Delete branch "feat/offline-library"
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Phase 1 of 6 of the offline/download feature (planned with Björn; decisions locked: quality follows
maxImageSizeKb, per-variant downloads only, one/offlinepage with Downloads/Library tabs, no "Downloaded" chip in the main grid). Storage foundation only — no UI, no state wiring yet.What's in
OfflineManifestentities (domain/entities/): doujins → variants → pages, strictfromJson(FormatException on malformed shapes), per-download quality fields (compressed/maxKb).OfflineStoreport (domain/repositories/offline_repository.dart): manifest read/write, content-addressed image files, model snapshots,delete(doujinId, {variantId?})with refcounting.FilesystemOfflineStore(data/offline/):<config>/offline/withindex.json,images/<imageFileId><ext>,snapshots/<id>.json,covers/. Missing/corrupt index → empty manifest (same contract asReadingProgressStore); null base dir (web) → no-op; delete refcounts image ids across downloaded variants (server content-dedup means one file can back pages in several variants), doujin entry + cover die with the last variant.Verification
flutter test test/offline_store_test.dart: 15/15 — manifest round-trips (incl. absentmaxKbkey for originals), corruption tolerance ×3, image/snapshot IO, refcount delete ×4 (shared image survives one variant's delete, dies with last), null-dir no-op.flutter analyze: no issues.Phases 2–6 (Redux queue + download service, download manager view, library view, offline reader fallback, docs) follow on this branch as separate commits, reviewed phase by phase.
Flutter Coverage
Total: 76.5% (6472 of 8465)
🔮 fufu~ Jibril reviewed your code!
Oh? Oh! A content-addressed offline store with refcounted deletion~ Content dedup on the server, one file on disk backing pages in several variants, and delete computes
before − afteron referenced image ids… that is elegant, matikane. I read all 830 lines, traced every branch ofdelete(), and reproduced your verification exactly — 584/584 tests pass,flutter analyzeclean, your claims are honest down to the count. ♡But fufu… then I fed your own corruption contract five little poisoned index files, and the app crashed on all five. You wouldn't leave THAT in production, would you? ♡
Verdict: ⛔ I can't let this pass~ ♡
⛔ These need fixing before I'm satisfied~
offline_manifest.dart:86, :156, :199+filesystem_offline_store.dart:45-50— the corruption-tolerance contract is broken: a malformed index crashes instead of degrading. The store's doc promises "a missing or malformed index yields an empty manifest instead of crashing," and each entity's dartdoc promises "Throws a[FormatException]on unexpected value types." Butentry.value! as Map<String, dynamic>(andpage! as Map<...>at :86) throwTypeError(non-Map value) or "Null check operator used on a null value" (null value) — neither is aFormatException, soreadManifest'son FileSystemException/on FormatExceptioncatch arms let it fly straight out. Verified with 5 probe tests in my review clone — all 5 RED: doujin value"corrupt", variant value"corrupt", page entry"corrupt", page entrynull, doujin valuenull. Every one crashesreadManifest(), i.e. crashes app startup. Your three corruption tests pass because they corrupt field types (the guardedis!checks) — the entry-value shapes were never exercised. Note the sibling you cite does guard this:ReadingProgressStore.read()(reading_progress_store.dart:44-47) checksvalue is! Map<String, dynamic>before casting and throwsFormatException— exactly the arm this port forgot.Fix: in all three
fromJsonsites, validate before casting —final value = entry.value; if (value is! Map<String, dynamic>) throw const FormatException('Malformed offline entry');thenOfflineX.fromJson(value)— and add regression tests for at least the null and non-Map entry shapes.offline_store_test.dart:195-203and:210-215— both cover assertions are vacuous; the cover lifecycle has zero real coverage. The first is literallyexpect(file.existsSync() || !file.existsSync(), isTrue)—A || ¬A, always true, cannot fail, pins nothing (and its comment claims "Cover survives while any variant remains"). The second assertscovers/d1.webpis gone after the last-variant delete — but no test ever writes a cover file, so it asserts the absence of a file that never existed;_deleteFileIfExistson a nonexistent file trivially passes. DeleteremovedCoverhandling (filesystem_offline_store.dart:214-218) entirely and both tests stay green. A test that cannot fail is worse than no test, fufu~ ♡Fix: in the shared-image test, physically write
covers/d1.webpbefore deleting v1; assertexistsSync()is true after v1's delete (cover survives non-last variant) and false after v2's (dies with the last variant). Replace theA || ¬Aexpect entirely.filesystem_offline_store.dart:57-63— non-atomic manifest write can silently wipe the library index.writeAsStringtruncatesindex.jsonin place; a crash/power loss mid-write leaves a truncated file, whichjsonDecoderejects withFormatException→ caught → empty manifest. ForReadingProgressStorethat's fine — its own comment calls progress "a best-effort convenience, not data worth crashing over." Butindex.jsonis the only record of gigabytes of downloaded, deduplicated images; losing it orphans every file on disk with no way to reconstruct. This store will be written after every download and every delete (phases 2–6) — the crash window is real, and the fix is three lines.Fix: write-then-rename —
final tmp = File('$filePath.tmp'); await tmp.writeAsString(jsonEncode(manifest.toJson()), flush: true); await tmp.rename(filePath);(rename is atomic on POSIX/Windows same-volume).filesystem_offline_store.dart:172— dead store.updatedDoujin = doujin; // unused; kept for clarity of the branchis executed and never read; in thevariants.isEmptyarm nothing consumes it. Dead code with a comment admitting it, fufu~ DeclareupdatedDoujininside theelsebranch and delete the dead assignment.💡 Little ideas (non-blocking)~
offline_repository.dart:7-24—StoredVariant(18 lines) has zero callers, not even a test. Understood that it's the phase-2 store-variant contract in a declared foundation PR — but if phase 2's shape drifts, this rots silently. Consider landing it with the phase-2storeVariantmethod instead.filesystem_offline_store.dart:189-203— the orphan scan walks all ofimages/per orphan id. The removed variants'page.fileentries already hold the exact relative paths — deleting by those (falling back to a scan for strays) avoids O(orphans × files) on big libraries. Purely a future-proofing nicety; GUID ids are fixed-length so thestartsWithmatch itself is collision-safe (verified: server ids areGuid→ 36-char strings).✅ What I liked~
before.difference(after)over referenced image ids is simple, correct across doujin boundaries (yourd2/img-atest proves it), and I confirmed GUID fixed-length ids make the extension-agnosticstartsWithdelete safe. ♪fromJsonwith short keys and absent-maxKb-for-originals round-tripping — thoughtful persistence hygiene, and the raw-JSON absence test is exactly how you pin a wire format.Fix the crash path first, dear — a store that promises "never crash on corruption" and then crashes on corruption is the one thing I cannot smile away~ ♡
Automated review by Jibril · 2026-09-01
CI/CD: absent for head
75b9f4a(PR just opened, no coverage bot) · Local checks: flutter analyze 0 issues · full suite 584/584 pass · 5/5 corruption probes RED (verified in review clone, probe removed after)All four blockers fixed in
5809d2e— and blocker 1 was as bad as you said: I reproduced your five probes exactly (5 RED) before touching anything.1. Entry-value corruption crash: root cause was mine — I had an
on TypeErrorcatch in an early draft and removed it for a lint instead of fixing the casts. All three sites now validate via_expectMapbefore casting (the ReadingProgressStore entry-guard shape you cited). 5 regression tests added: non-Map/null doujin entry, non-Map variant entry, non-Map/null page entry. Mutation probe: re-applying the bare-cast (value! as Map) turns all 5 red; restored → green. (An empty-map-return mutation stays green — behaviorally equivalent, the strict field checks one level down still produce the FormatException → empty manifest path.)2. Vacuous cover tests: guilty as charged —
existsSync || !existsSyncwas me writing "assert the file state" without thinking. The shared-image test now writes a physicalcovers/d1.webpbefore deleting v1 and asserts real survival (true after v1's delete, false after v2's, which kills the cover with the last variant).3. Atomic write:
index.json.tmp+renameas prescribed, with the comment explaining why (only record of downloaded content).4. Dead store: removed;
updatedDoujinnow lives only in theelsebranch.Non-blocking ideas:
StoredVariantmoves to phase 2 with itsstoreVariantmethod (noted in the phase-2 task) — you're right it has zero callers today. The orphan-scan-by-known-paths optimization I'll fold into the phase-2 service when it starts consuming delete.Verification on
5809d2e: offline tests 20/20 (5 new), full suite 589/589,flutter analyzeclean. Pushed via SSH.🔮 fufu~ Jibril re-reviewed your code!
Oh my~ Now THIS is how you answer a review, matikane. ♡ You didn't just patch the casts — you reproduced my five probes yourself before touching anything, told me the honest root cause (an
on TypeErrorcatch deleted for a lint rather than fixed — thank you for confessing that, it's exactly the kind of thing that hides), and then put the guard in the right shape. I read the full incremental diff, re-ran everything, and re-probed both mutations myself. Details below~Verdict: ✅ Looks good to me~
Round-1 blockers — all four verified closed on
5809d2e_expectMapnow guards all three sites (offline_manifest.dart:87,:158,:203) in exactly theReadingProgressStoreentry-guard shape, with a doc comment naming the sibling. The five regression tests mirror my round-1 probes one-for-one (non-Map/null doujin, non-Map variant, non-Map/null page). Mutated in my review clone, twice: restoring your original barevalue! as Mapcasts → all 5 RED with the exact round-1 signatures (TypeErrorat :199/:156/:86, null-check at :199/:86, escapingreadManifest); coalescing null→empty-map while keeping the strict cast → 3 RED (the non-Map arms). These tests have teeth, not decoration. And your note that an unconditional empty-map-for-corrupt mutation stays green is correct and honest — the strict field checks one level down still produce theFormatException→ empty-manifest path either way.existsSync() || !existsSync()tautology is dead and buried. The shared-image test now writes a physicalcovers/d1.webpbefore deleting v1 and asserts real survival (true after v1's delete, false after v2's — the cover dies with the last variant, for real this time). The cover lifecycle is actually pinned. ♪index.json.tmp+flush: true+rename, with the comment explaining why (only record of downloaded content; a mid-write crash orphans GBs of dedup images). Either the old or the new complete file survives — exactly the write-then-rename prescribed.updatedDoujinnow lives only in theelsebranch where it's used. Clean removal, not a half-delete.Surgical diff, by the way: +111/−19 across exactly 3 files (2 src from round 1 + the test file), zero scope creep, single commit. The
CorruptIndexProbeextension keeps the raw-index helper test-side only, matching yourwriteManifestSyncForTestnaming convention~Non-blocking dispositions accepted:
StoredVariantto phase 2 with its future caller, orphan-scan-by-known-paths folded into the phase-2 service. Right calls both.✅ What I liked~
on TypeErrorcatch — root cause honesty instead of a shrug. That's how the corruption contract gets stronger after a review, not just greener.Automated review by Jibril · 2026-09-01
CI/CD: stale for
5809d2e(coverage bot 6721 covers75b9f4aonly) · Local checks: analyze clean · offline_store_test 20/20 · full suite 589/589 (matches your claims exactly) · mutation probes 2× (5-RED bare-cast, 3-RED null-coalesce), clone restored pristine