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… skip and rescan flows off the main actor (#184) ReadFileContent read a conflict note of any size into memory and handed it across the bridge, where the conflict screen rendered it as one Text and line-diffed it; a large note froze the UI or got the app killed by the watchdog. Skipping a file with its conflict copies (an ignore read-modify-write, a walk over the vault, a rescan) and the foreground sync request's rescans ran on the main actor and blocked it on disk and on the bridge lock. The bridge now refuses a file above 1 MiB before reading it (error:too large:<bytes>), never reads past the bound, and exports the bound (MaxReadFileBytes). The app decodes that refusal into a "Too Large to Compare" state that names both sizes and keeps the Keep This / Keep Both / Keep Other actions, and re-checks the bytes it received against the same bound. skipFileAndCleanupConflicts is async with its bridge work detached; the foreground rescans run detached too. What could go wrong and why this is safe: a truncated comparison could invite a wrong resolution, so nothing above the bound is compared at all — the choice stays manual (decision 028) and the comparison moves to Obsidian. The Go regression test reproduces the unbounded read on main first (one byte over the bound came back in full); the Swift tests pin the protocol decoder and, against a real engine, the refusal and the skip flow's unchanged contract. Go suite, design-token lint, strings parity and the full Xcode plan pass on the rebuilt xcframework. Decision 041 records the bound. Closes #184
📝 WalkthroughWalkthroughThe change bounds conflict-file reads in the Go bridge and Swift app, adds an oversized-file conflict state, and moves conflict cleanup and rescans off the main actor. Tests cover boundary reads, response parsing, UI-facing results, and skip cleanup. ChangesConflict read reliability
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: 🟡 Moderate · up to Conflict resolution can hide a read failure, freeze during refresh, or lose concurrently edited ignore rules. These issues should be corrected before merge. 🚥 Pre-merge checks | ✅ 5 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (5 passed)
Full details: Linked Issues checkExplanation Issue Full details: Bounded Ios Background WorkExplanation The new detached work has no cancellation or expiration boundary. Resolution Use a retained, cancellable operation for each detached flow. Add explicit time and work bounds to directory cleanup and rescans, with cancellation checks between entries and folders; expose bridge cancellation or a deadline instead of relying on synchronous calls that can block indefinitely. Register the operation with the app's background-task/expiration coordination, cancel it from the expiration handler, stop further bridge work, and complete cleanup or record a terminal failure before returning. Make the ignore-write/cleanup/rescan sequence resumable or compensating so expiration cannot leave an unreported partial skip. Keep error records typed and sanitized so file names and vault paths are not written to logs or background state.
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 5
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Inline comments:
In `@docs/decisions/041-conflict-reads-bounded-in-both-layers.md`:
- Line 5: Update the Decision text around ReadFileContent to remove the claim
that the bridge never reads past maxReadFileBytes; describe the accepted-content
limit and the one-byte growth check that can occur when a file grows between
os.Stat and os.Open.
In `@go/bridge/conflicts.go`:
- Around line 284-285: Update the size assignment in the f.Stat() success branch
to preserve the observed oversized read length in len(data), rather than
replacing it with a smaller current file size. Ensure the reported error:too
large byte count remains at least len(data) when the file shrinks after the
limited read.
In `@ios/VaultSync/Services/SyncthingManager.swift`:
- Line 2369: Update skipFileAndCleanupConflicts and refreshConflicts so folder
IDs are captured, conflict data is read via
SyncBridgeService.getConflictFilesJSON(folderID:) in detached snapshot work
following pollBridgeState, and only the resulting conflictFiles snapshot is
applied on the main actor.
- Around line 2366-2368: The ignore read-modify-write in
skipFileAndCleanupConflicts and performSkipFileAndCleanup must be serialized
with togglePreset, addIgnorePatterns, and removeIgnorePatterns. Route all ignore
mutations through one shared synchronization boundary, or replace the separate
SyncBridgeService reads and writes with an atomic bridge operation, ensuring
concurrent updates cannot overwrite one another.
In `@ios/VaultSync/Views/ConflictDiffView.swift`:
- Around line 338-339: Update loadContent() to evaluate failed read results
before checking the tooLarge state, ensuring any .failed outcome sets loadError
and prevents resolution actions from remaining enabled. Preserve
LoadedContent(tooLargeBytes:) only when neither read has failed.
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📒 Files selected for processing (12)
CHANGELOG.mddocs/decisions/041-conflict-reads-bounded-in-both-layers.mdgo/bridge/boundedread_test.gogo/bridge/conflicts.goios/VaultSync/Services/SyncBridgeService.swiftios/VaultSync/Services/SyncthingManager.swiftios/VaultSync/Views/ConflictDiffView.swiftios/VaultSync/de.lproj/Localizable.stringsios/VaultSync/en.lproj/Localizable.stringsios/VaultSync/es.lproj/Localizable.stringsios/VaultSync/zh-Hans.lproj/Localizable.stringsios/VaultSyncTests/ConflictReadBoundTests.swift
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This code crosses the gomobile Swift-Go boundary.
⚙️ CodeRabbit configuration file
Files:
go/bridge/conflicts.gogo/bridge/boundedread_test.go
Focus on Swift 6 strict concurrency, Sendable/MainActor correctness, Task cancellation, retain cycles, memory pressure, SwiftUI observation state, StoreKit/APNs flows, and iOS background execution limits.
⚙️ CodeRabbit configuration file
Files:
ios/VaultSync/Views/ConflictDiffView.swiftios/VaultSyncTests/ConflictReadBoundTests.swiftios/VaultSync/Services/SyncBridgeService.swiftios/VaultSync/Services/SyncthingManager.swift
Review public documentation for technical accuracy, privacy/security claims, App Store-facing wording, setup correctness, and consistency with the free app plus optional Cloud Relay subscription model.
⚙️ CodeRabbit configuration file
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.mdCHANGELOG.md
VaultSync syncs private Obsidian notes through Syncthing.
⚙️ CodeRabbit configuration file
Files:
ios/VaultSync/es.lproj/Localizable.stringsdocs/decisions/041-conflict-reads-bounded-in-both-layers.mdios/VaultSync/zh-Hans.lproj/Localizable.stringsgo/bridge/conflicts.goios/VaultSync/en.lproj/Localizable.stringsCHANGELOG.mdios/VaultSync/de.lproj/Localizable.stringsgo/bridge/boundedread_test.goios/VaultSync/Views/ConflictDiffView.swiftios/VaultSyncTests/ConflictReadBoundTests.swiftios/VaultSync/Services/SyncBridgeService.swiftios/VaultSync/Services/SyncthingManager.swift
Diagnostics publication, registry digests, rollout state, and public artifact availability must be established only by the owner-gated workflow and evidence in `helper-publication-rollout.md`; source text must never claim publication.
📄 CodeRabbit inference engine (docs/helper-runtime-packaging-readiness.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
Revocation and rollback must preserve immutable authorization history and all retained Syncthing peer, versioning, backup, conflict, remote-history, and tombstone copies; rollback or downgrade must not erase, rewrite, replace, regenerate, o...
📄 CodeRabbit inference engine (docs/helper-runtime-packaging-readiness.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
a relay rate-limit (HTTP 429) counts as **success** — it proves the trigger endpoint is reachable An inactive subscription prints a `WARN` for the trigger check (`WARN Relay trigger endpoint response sanity`, followed by `relay reports no a...
📄 CodeRabbit inference engine (docs/troubleshooting.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
Diagnostics is additive and opt-in: without both explicit configuration paths, helper 2.0.2 must retain prior Trigger-v1 behavior and create no diagnostics state.
📄 CodeRabbit inference engine (docs/helper-publication-rollout.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
Do not log or persist private/public keys, secrets, QR payloads, TLS pins, identifiers or digests, bindings, nonces, transcript fingerprints, signed bodies, paths, or credential records; update `PRIVACY.md` before runtime credential transpo...
📄 CodeRabbit inference engine (docs/decisions/022-diagnostics-helper-credentials-and-mutual-pairing.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
Classify a connected root as a container, never as a vault-as-root, when it contains at least one direct subdirectory containing `.obsidian/`, regardless of whether the root itself contains `.obsidian/`.
📄 CodeRabbit inference engine (docs/decisions/014-vault-subfolders-override-stray-root-config.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
Every Relay provision request must require a locally verified, active Relay entitlement and its signed StoreKit transaction; never send a placeholder when this evidence is unavailable.
📄 CodeRabbit inference engine (docs/decisions/018-relay-reprovision-requires-verified-entitlement.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
Keep background start, local data progress, upload, download, and full-roundtrip proof as independent fields; never derive a global success flag.
📄 CodeRabbit inference engine (docs/decisions/020-sync-path-proof-requires-correlated-evidence.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
Keep the diagnostics capability disabled until human security and product approval, separate pairing/canonical-contract decisions, and required implementation evidence are complete.
📄 CodeRabbit inference engine (docs/decisions/023-diagnostics-namespace-and-least-privilege-access.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
Treat Decisions 022–024 as formally proposed designs whose text and status remain unchanged by this approval record.
📄 CodeRabbit inference engine (docs/decisions/025-owner-approval-of-diagnostics-design-gates.md)
Files:
docs/decisions/041-conflict-reads-bounded-in-both-layers.md
For Swift background execution changes, pass if work is bounded, cancellation-aware, handles expiration callbacks, and records errors without leaking private vault data.
📄 CodeRabbit inference engine (Custom checks)
Files:
ios/VaultSync/Views/ConflictDiffView.swiftios/VaultSyncTests/ConflictReadBoundTests.swiftios/VaultSync/Services/SyncBridgeService.swiftios/VaultSync/Services/SyncthingManager.swift
🧠 Learnings (1)
📓 Common learnings
Learnt from: CR
Repo: psimaker/vaultsync
Timestamp: 2026-09-15T12:13:04.253Z
Learning: The Go bridge refuses a file above `maxReadFileBytes` (1 MiB) before reading it (`error:too large:<bytes>`) and never reads past the bound.
Learnt from: CR
Repo: psimaker/vaultsync
Timestamp: 2026-09-15T12:13:04.253Z
Learning: The app reads the bound from the bridge (`MaxReadFileBytes`), re-checks the bytes it received, and shows a "Too Large to Compare" state that names both sizes; the resolution actions stay available, so the choice remains manual (decision 028) and only the comparison moves to Obsidian.
🪛 LanguageTool
CHANGELOG.md
[style] ~20-~20: As an alternative to the over-used intensifier ‘very’, consider replacing this phrase.
Context: ...finished. Recorded in decision 038. - **Very large conflicting notes no longer freeze the ...
(EN_WEAK_ADJECTIVE)
🔇 Additional comments (6)
ios/VaultSync/Services/SyncBridgeService.swift (1)
266-285: LGTM!Also applies to: 287-295, 297-297
ios/VaultSync/Services/SyncthingManager.swift (1)
1862-1878: LGTM!Also applies to: 2155-2160, 2170-2173, 2187-2192
ios/VaultSync/Views/ConflictDiffView.swift (1)
12-14: LGTM!Also applies to: 51-52, 255-257, 259-259, 291-318, 324-337, 342-378
ios/VaultSync/de.lproj/Localizable.strings (1)
943-944: LGTM!ios/VaultSync/en.lproj/Localizable.strings (1)
943-944: LGTM!ios/VaultSyncTests/ConflictReadBoundTests.swift (1)
1-99: LGTM!
1 participant
Closes #184 (child of #151). Branches from
mainafter #181; independent of #189 and the #183 PR.What
ReadFileContentstats first, refuses anything abovemaxReadFileBytes(1 MiB) witherror:too large:<bytes>, reads through aLimitReaderso a file that grew is still refused; new exportMaxReadFileBytes().SyncBridgeService.readFileContentreturnsConflictFileRead(.content/.tooLarge(bytes:)/.failed) via a pure decoder;ConflictDiffViewshows "Too Large to Compare" (both sizes, resolution bar stays), re-checks received bytes against the bridge's bound; four languages.skipFileAndCleanupConflictsisasyncwith the ignore read-modify-write, conflict-copy walk and rescan detached (performSkipFileAndCleanup); the foreground sync request's rescans run detached.Reproduction (RED on
main)TestIssue184_ReadFileContentBounded:ReadFileContent(over cap) returned 1048577 bytes, want an error:too large: refusal.Verification
cd go && make patch && go test -tags noassets ./bridge -count=1— green (83 s);gofmt -l go/bridgeempty.ios/scripts/design-token-lint.sh,LC_ALL=C ios/scripts/strings-key-parity.sh— green.make xcframework, full Xcode plan on iPhone 17 Pro (iOS 26.5) — see checklist below.Out of scope (tracked in #151)
The quick config-commit calls (add/remove device or folder, share, rename, resolve/keep-both renames) stay on the main actor and move with the #187 screen rebuild;
SyncthingManager.stop()at scene background stays synchronous (a fire-and-forget stop would reopen a #183 ownership window).Handoff
cd go && make patch && make xcframework).Summary
Impact
This limits memory use and prevents large files or slow operations from freezing the UI or triggering watchdog termination. The change does not expose additional file content.
Verification
Tests cover exact-limit and oversized reads, response parsing, oversized-diff handling, and cleanup behavior. Test execution results are not provided. An xcframework rebuild is required before the next archive.