fix(swift-sdk)!: bound contested username loading - #4485
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe DPNS contest query path now bounds vote-state concurrency, applies a 30-second FFI timeout, and executes the Swift API asynchronously with serialized cancellation and SDK lifetime handling. ChangesDPNS contest queries
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The change bounds contest loading and moves the blocking operation off the main thread while preserving ordering and limits; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant SwiftSDK
participant FFI
participant RustSDK
participant DPNSState
SwiftSDK->>FFI: Schedule dpnsActiveContests(limit:)
FFI->>RustSDK: Fetch active contested usernames with 30-second timeout
RustSDK->>DPNSState: Query vote states with concurrency limit 8
DPNSState-->>RustSDK: Return vote states
RustSDK-->>FFI: Return contests or timeout/null error
FFI-->>SwiftSDK: Free and decode results
SwiftSDK-->>SwiftSDK: Throw CancellationError when cancellation applies
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Title checkExplanation The title clearly and concisely describes the main change: bounding contested username loading in the Swift SDK. The breaking-change marker is appropriate because dpnsActiveContests became asynchronous.
✨ Finishing Touches🧪 Generate unit tests (beta)
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✅ Final review complete — no blockers (commit a634f38) |
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Actionable comments posted: 1
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Inline comments:
In `@packages/swift-sdk/Sources/SwiftDashSDK/Voting/SDK`+DPNSContests.swift:
- Around line 74-79: Update the detached task around
dash_sdk_dpns_get_contested_non_resolved_usernames to retain a strong SDK owner
or handle lease for the task’s entire lifetime, and add cancellation-aware
behavior for the blocking FFI call. If the FFI remains non-cancellable,
explicitly document that contract and add tests covering both caller
cancellation and SDK lifetime safety.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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📒 Files selected for processing (3)
packages/rs-sdk-ffi/src/dpns/queries/contested.rspackages/rs-sdk/src/platform/dpns_usernames/contested_queries.rspackages/swift-sdk/Sources/SwiftDashSDK/Voting/SDK+DPNSContests.swift
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This synchronous FFI call can block for up to 30 seconds, but it is executed via Task.detached, which runs on Swift’s cooperative executor. Navigating back cancels only the Swift task; it cannot interrupt the native call. Reopening or refreshing the screen can therefore accumulate blocked executor threads and eventually delay or starve unrelated async work. Please run the blocking FFI on a dedicated DispatchQueue and bridge it with a checked continuation, as we already do for createWallet and teardown. Ideally, queued work that is cancelled before entering Rust should be skipped.
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Addressed in a634f38. @llbartekll, the synchronous FFI call now runs on a dedicated serial DispatchQueue and is bridged with a checked continuation, so it no longer occupies Swift's cooperative executor. A lock-backed request phase atomically distinguishes queued from running work. Cancellation before the queue begins a request skips Rust entirely; cancellation after native work starts waits for the existing bounded timeout, consumes/frees any returned list, and then throws CancellationError. The request also strongly owns the SDK and handle for the full queued/native lifetime, and the continuation is resumed only by the queue closure. I rebuilt the exact Platform/DashWallet PR pair with Xcode, installed it on the clean simulator, launched it, and verified it remained alive. 🤖 Posted autonomously by Codex on behalf of pasta. |
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Reviewed exact head a634f38. The latest commit addresses the blocking FFI call by moving it to a dedicated serial queue, safely retains the SDK handle, and handles cancellation without leaking the returned list. Rust fan-out remains bounded and ordered, with the full FFI operation capped at 30 seconds. Targeted Rust checks and formatting pass; no blockers found.
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Final validation — Codex/Sol only (Phase 2 disabled)
At exact head a634f38, the implementation correctly bounds and orders Rust vote-state requests, enforces the deadline, and moves blocking FFI work onto a dedicated Swift queue with sound cancellation, ownership, and cleanup behavior. No blocking defect was found, but the new bounded-concurrency and ordering guarantees lack deterministic regression coverage.
Source: reviewer backend gpt-5.6-sol (general, rust-quality, and FFI-engineer lanes); final verifier backend gpt-5.6-sol. openclaw-agent/cliproxy/gpt-5.6-sol was orchestration-only and is not reviewer evidence.
Validated zero-blocker Codex/Sol precheck evidence was promoted to final because Phase 2 (Sonnet/Opus) is temporarily disabled. This is Codex/Sol-only final validation, not Codex + Sonnet/Opus coverage.
Review provenance
- Codex reviewers:
gpt-5.6-sol— general (completed),gpt-5.6-sol— rust-quality (completed),gpt-5.6-sol— ffi-engineer (completed) - Verifier:
gpt-5.6-sol— verifier - Sonnet/Opus: not run (Phase 2 disabled — temporary Codex/Sol-only final)
- Secondary pass: disabled (
temporary_phase2_sonnet_disable)
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These findings are from an automated code review. Verify each finding against the current code and only fix it if needed.
In `packages/rs-sdk/src/platform/dpns_usernames/contested_queries.rs`:
- [SUGGESTION] packages/rs-sdk/src/platform/dpns_usernames/contested_queries.rs:340-344: Bounded ordered fan-out lacks deterministic regression tests
This stream now guarantees no more than eight concurrent vote-state requests while preserving key order and selecting the first N unresolved contests, but no runnable test exercises those guarantees. The existing `test_get_contested_non_resolved_usernames` is an ignored live-network test that cannot control completion order or observe peak concurrency. Add a hermetic test using delayed mocked responses, or extract the stream scheduling into a testable helper, and verify the concurrency ceiling, stable first-N output under out-of-order completion, early-limit cancellation, and per-request error handling.
| let vote_states = stream::iter(current_contests).map(|(name, end_time)| async move { | ||
| let state = self.get_contested_dpns_vote_state(&name, None).await; | ||
| (name, end_time, state) | ||
| }); | ||
| let mut vote_states = vote_states.buffered(DPNS_VOTE_STATE_QUERY_CONCURRENCY); |
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🟡 Suggestion: Bounded ordered fan-out lacks deterministic regression tests
This stream now guarantees no more than eight concurrent vote-state requests while preserving key order and selecting the first N unresolved contests, but no runnable test exercises those guarantees. The existing test_get_contested_non_resolved_usernames is an ignored live-network test that cannot control completion order or observe peak concurrency. Add a hermetic test using delayed mocked responses, or extract the stream scheduling into a testable helper, and verify the concurrency ceiling, stable first-N output under out-of-order completion, early-limit cancellation, and per-request error handling.
source: ['codex']
3 participants
Issue being fixed or feature implemented
DashWallet's Username voting screen can become unresponsive while loading active DPNS contests. The Swift call enters a blocking FFI function, while the Rust SDK fetches every contest's vote state serially without an overall deadline. A slow or unreachable DAPI node can therefore pin the caller indefinitely.
What was done?
SDK.dpnsActiveContestsasynchronous and move the blocking FFI call to a detached task.How Has This Been Tested?
cargo fmt --all -- --checkcargo check -p dash-sdk -p rs-sdk-fficargo test -p dash-sdk -p rs-sdk-ffi --lib(508 passed, 1 ignored)SKIP_EXAMPLE_APP_BUILD=1 ./build_ios.sh --target sim --profile devBreaking Changes
SDK.dpnsActiveContests(limit:)now returns asynchronously. Swift callers must addawait.Checklist:
For repository code-owners and collaborators only
This pull request was created by Codex.
Summary by CodeRabbit
Bug Fixes
Improvements