fix(fs): fail closed on corrupt/unreadable desktop project data (DA-01) - #516
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decompressData() silently substituted {} for a failed lz-string decompression
(which returns null, never throws, on corrupt/truncated input) instead of
surfacing the failure — masking real data corruption as a valid empty object.
It now throws DecompressionError.
FsProjectStore.loadProject() collapsed genuine absence, corruption, and I/O
failure into the same null return, which every caller reads as "no saved
project" — including the desktop cold-boot path (appBootstrap.ts) and
autosave, risking a corrupted-but-recoverable file being silently treated as
nonexistent and eventually overwritten. Genuine absence (file doesn't exist)
still resolves to null, unchanged; corruption or I/O failure now throws
ProjectLoadError with a reason field distinguishing them, and a minimal
project-shape guard rejects a payload that parses as valid JSON but isn't
project-shaped at all (e.g. {}). Neither appBootstrap.ts nor index.tsx needed
changes: the throw propagates naturally into bootApp()'s existing catch,
which already renders an honest error screen instead of silently booting as
a new user.
libraryBackupService.ts's per-project loop now catches this new throw so one
corrupted project doesn't abort the whole library backup — it's recorded
with a null payload and a logged warning instead, matching its prior
null-tolerant shape.
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Reviewer's GuideThe PR closes the desktop project-storage corruption gap by distinguishing missing files from corrupt data and I/O failures, propagating honest load errors to the existing boot error flow, and isolating failures during library backups without changing backup format or successful-load behavior. Sequence diagram for fail-closed desktop project loadingsequenceDiagram
participant Boot as bootApp()
participant Store as FsProjectStore
participant FS as Desktop filesystem
participant Core as decompressData()
participant Screen as StorageErrorScreen
Boot->>Store: loadProject(projectId)
Store->>FS: exists(projectFile)
alt file absent
FS-->>Store: false
Store-->>Boot: null
else file present
Store->>FS: readTextFile(projectFile)
alt I/O failure
FS-->>Store: throws
Store-->>Boot: throws ProjectLoadError(io-error)
Boot->>Screen: render error
else readable content
FS-->>Store: content
Store->>Core: decompressData(content)
alt corrupt or invalid project
Core-->>Store: throws DecompressionError or parse error
Store-->>Boot: throws ProjectLoadError(corrupt)
Boot->>Screen: render error
else valid project
Core-->>Store: parsed project
Store-->>Boot: project
end
end
end
Sequence diagram for resilient library backup collectionsequenceDiagram
participant Backup as collectLibraryBackupPayload()
participant Storage as storageService
participant Logger as logger
Backup->>Storage: loadProject(projectId)
alt project missing or valid
Storage-->>Backup: null or project
Backup->>Storage: getStoryCodex(projectId)
Backup->>Storage: getRagVectors(projectId)
Backup->>Storage: listBinderAssetIds(projectId)
else corrupt or unreadable project
Storage-->>Backup: throws ProjectLoadError
Backup->>Logger: warn(unreadable project)
Backup->>Storage: getStoryCodex(projectId)
Backup->>Storage: getRagVectors(projectId)
Backup->>Storage: listBinderAssetIds(projectId)
end
File-Level Changes
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🏁 CodeAnt Quality Gate ResultsCommit: ✅ Overall Status: PASSEDQuality Gate Details
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Review Summary
This PR implements a critical security improvement by failing closed on corrupt/unreadable desktop project data instead of silently treating corruption as valid empty objects. The error-handling architecture is well-designed with distinct error types (DecompressionError, ProjectLoadError) and proper propagation through the call chain.
Critical Issue Found: 1
JSON Parse Error Handling - The decompressData() function can throw uncaught SyntaxError from JSON.parse() instead of the documented DecompressionError, breaking the contract with callers. This must be fixed to ensure all corruption scenarios throw the expected error type.
Architecture Assessment
✅ Strengths:
- Proper fail-closed strategy prevents silent data corruption
- Distinct error reasons ('corrupt' vs 'io-error') enable appropriate UX
- Library backup service correctly isolates failures to prevent cascading abort
- Type guard
looksLikeStoryProject()catches shape mismatches early - Error messages are clear and actionable
The implementation correctly addresses DA-01's core requirement that corruption never collapse into the same null return that means "no project exists yet."
Recommendation: Address the JSON parse error handling issue before merge to ensure complete error isolation.
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📝 WalkthroughWalkthroughChangesProject loading and backup handling
README test metrics
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk:🟡 Moderate · up to Incomplete or unreadable desktop project files may still be mishandled: an incomplete payload can load as a project, while some filesystem failures may surface as unclassified errors. These gaps weaken the intended protection against silent data loss and should be addressed before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 6 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@services/fs/projectFsStore.ts`:
- Around line 34-40: Update looksLikeStoryProject to validate the complete
persisted StoryProject shape, requiring logline, characters, and worlds in
addition to title and manuscript, so incomplete data is rejected and the loader
raises ProjectLoadError('corrupt'). Add regression cases covering each required
field when missing.
- Around line 113-120: Update loadProject so the apis.exists(projectFile) call
runs inside the existing readTextFile error boundary, ensuring rejected
filesystem checks become ProjectLoadError with reason 'io-error' rather than
escaping raw. Add a test covering exists rejection and asserting the classified
error.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
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Plan: Pro
Run ID: e046398e-360d-48ba-92d5-055f834cc3c9
📒 Files selected for processing (7)
README.mdservices/fs/fsCore.tsservices/fs/projectFsStore.tsservices/libraryBackupService.tstests/unit/libraryBackupService.test.tstests/unit/services/fs/fsCore.test.tstests/unit/services/fs/projectFsStore.test.ts
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Addresses PR #516's first review wave (Amazon Q, CodeAnt AI, CodeRabbit, chatgpt-codex-connector): - decompressData(): wrap JSON.parse in both branches so malformed JSON also throws DecompressionError instead of leaking a bare, undocumented SyntaxError — callers of this shared FS utility should only ever need to handle one corruption-signaling error type. - looksLikeStoryProject(): was accepting any object with just a string title and array manuscript as a valid project. Now also requires logline (string) and characters/worlds (array or EntityState shape) — a truncated file that lost everything but those two fields no longer slips past the guard as "valid". - loadProject(): the exists() existence probe now runs inside the same io-error boundary as readTextFile — a rejection there (not just a false result) was previously escaping as a raw, unclassified error instead of ProjectLoadError('io-error'). - libraryBackupService.ts's per-project catch now only swallows ProjectLoadError; any other (unexpected) failure rethrows instead of being silently absorbed as "skip this project", so a genuine bug in the load path still surfaces instead of masquerading as ordinary corruption. New/updated regression tests for every fix above.
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User description
Summary
Part of the post-#512 deep audit program (DA-01, second slice after #513/DA-03).
services/fs/fsCore.ts#decompressDatasilently substituted{}for a failed lz-string decompression (which returnsnull, never throws, on corrupt/truncated input) — masking real data corruption as a valid empty object.FsProjectStore.loadProject()then collapsed genuine absence, corruption, and I/O failure into the samenullreturn, which every caller (including the desktop cold-boot path inappBootstrap.ts) reads as "no saved project" — risking a corrupted-but-recoverable file being silently treated as nonexistent and eventually overwritten by autosave.Changes
decompressData()now throwsDecompressionErrorinstead of substituting{}.FsProjectStore.loadProject(): genuine absence (file doesn't exist) still resolves tonull, unchanged. Corruption or I/O failure now throwsProjectLoadErrorwith areason: 'corrupt' | 'io-error'field. A minimal shape guard also rejects a payload that parses as valid JSON but isn't project-shaped at all (e.g. a stray{}).appBootstrap.tsnorindex.tsxneeded changes — the throw propagates naturally intobootApp()'s existing catch block, which already rendersStorageErrorScreenwith an honest message instead of silently booting as a new user.libraryBackupService.ts's per-project loop now catches the new throw so one corrupted project doesn't abort the whole library backup (it's recorded with anullpayload + a logged warning, matching its prior null-tolerant shape — no format change).Deferred (tracked separately, not release-blocking on current evidence)
StorageErrorScreen's "Reset Database & Reload" button is IndexedDB-only; on desktop it doesn't clear the corrupted Tauri filesystem file, so a user hitting this new error is stuck in an honest-but-unactionable loop. The core safety invariant (fail closed, never silently overwrite) is fully closed by this PR regardless; the recovery-UX gap is a separate, smaller follow-up.Test plan
tests/unit/services/fs/fsCore.test.ts,tests/unit/services/fs/projectFsStore.test.ts(new file),tests/unit/libraryBackupService.test.tspnpm run lint/pnpm run typecheck/ targeted vitest — all green locallypnpm run ci:prepush— PASSSummary by Sourcery
Prevent corrupted or inaccessible desktop project data from being silently treated as absent and overwritten.
Bug Fixes:
Enhancements:
Tests:
CodeAnt-AI Description
Fail closed when desktop project files are corrupted or unreadable
What Changed
Impact
✅ Fewer silent data overwrites✅ Clearer desktop storage errors✅ Complete backups despite one corrupt project💡 Usage Guide
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Summary by CodeRabbit
Bug Fixes
Documentation