fix(wallet): prevent UI freezes during network switches - #1054
fix(wallet): prevent UI freezes during network switches#1054llbartekll wants to merge 2 commits into
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Await native SDK teardown off the main thread, serialize managed network switches behind an app-wide transition overlay, and move shielded transaction snapshot reads to a private SwiftData context with timing telemetry.
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📝 WalkthroughWalkthroughChangesSDK runtime lifecycle and network switching
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟡 Moderate · up to The PR should not merge yet: a failed multi-network wallet wipe can leave temporary managers alive and race later wallet rebuilds, while the network-switch retry path still bypasses the required state-management boundary and may make retry behavior harder to keep consistent. Sequence Diagram(s)sequenceDiagram
participant User
participant NetworkSwitchOverlayPresenter
participant SwiftDashSDKWalletRuntime
participant WalletEnvironment
participant SwiftDashSDKHost
User->>NetworkSwitchOverlayPresenter: Select destination network
NetworkSwitchOverlayPresenter->>SwiftDashSDKWalletRuntime: switchNetwork(to:)
SwiftDashSDKWalletRuntime->>WalletEnvironment: switchToNetwork(source: .managedSwitch)
WalletEnvironment-->>SwiftDashSDKWalletRuntime: Managed network-change notification
SwiftDashSDKWalletRuntime->>SwiftDashSDKHost: Await teardown and rebuild
SwiftDashSDKHost-->>SwiftDashSDKWalletRuntime: Runtime readiness
SwiftDashSDKWalletRuntime-->>NetworkSwitchOverlayPresenter: Switching or failed phase
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In
`@DashWallet/Sources/Infrastructure/SwiftDashSDK/SwiftDashSDKWalletWiper.swift`:
- Around line 501-544: Move the shutDownTemporaryManagers helper before the
networks collection loop and wrap managerForWipe processing plus deletion
handling in a shared do/catch so any thrown lookup also shuts down previously
collected temporary managers. Replace the four-element deletions tuple with a
small named struct and update all field accesses accordingly, preserving
deterministic shutdown on both success and failure paths.
In `@DashWallet/Sources/UI/Menu/Settings/SettingsScreen.swift`:
- Around line 336-389: Introduce a small `@MainActor` ViewModel for
NetworkSwitchOverlayView that mirrors NetworkTransitionState and exposes
retry(), moving SwiftDashSDKWalletRuntime.shared.switchNetwork(to:) out of the
View struct. Update the retry Button action to call the ViewModel method and
have the view render from the ViewModel’s phase, leaving
NetworkSwitchOverlayView rendering-only.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (14)
DashWallet/Sources/Infrastructure/SwiftDashSDK/AssetLockRecoveryService.swiftDashWallet/Sources/Infrastructure/SwiftDashSDK/PlatformAddressSyncCoordinator.swiftDashWallet/Sources/Infrastructure/SwiftDashSDK/SwiftDashSDKHost.swiftDashWallet/Sources/Infrastructure/SwiftDashSDK/SwiftDashSDKSPVCoordinator.swiftDashWallet/Sources/Infrastructure/SwiftDashSDK/SwiftDashSDKWalletRuntime.swiftDashWallet/Sources/Infrastructure/SwiftDashSDK/SwiftDashSDKWalletWiper.swiftDashWallet/Sources/Infrastructure/SwiftDashSDK/UnconfirmedTransactionRemover.swiftDashWallet/Sources/Infrastructure/SwiftDashSDK/WalletEnvironment.swiftDashWallet/Sources/UI/Home/HomeViewController+Shortcuts.swiftDashWallet/Sources/UI/Home/Views/HomeViewModel.swiftDashWallet/Sources/UI/Menu/Settings/SettingsMenuViewModel.swiftDashWallet/Sources/UI/Menu/Settings/SettingsScreen.swiftDashWallet/Sources/UI/Payments/InternalTransfer/InternalTransferConfirmSheet.swiftDashWallet/Sources/UI/Payments/InternalTransfer/ShieldedTransferCoordinator.swift
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Reviewed the full diff, the CodeRabbit threads, and the state of the dependency. The architecture of this change is right — moving the blocking native teardown off-main and giving the rebuild a single owner is the correct fix. Two things I'd like resolved before this goes in, plus a merge-order blocker.
What looks good
stop()→stopAsync()with the native teardown off the main thread is the actual freeze fix, and the documented order (cancel + awaitcontactCryptoDrainWatch→manager.shutdown()→ drop references) is followed inSwiftDashSDKHost.swift:779+.- One owner for the rebuild (
switchNetwork(to:)), with the observer skipping.managedSwitchnotifications, removes the old double-drive of the lifecycle. isRuntimeReady(for:)as the single readiness predicate shared by refresh elision and the switch — and it now also requireshost.wallet != nil.- Call sites are consistently updated:
host.start((2), host stop (1),managerForWipe(2),ShieldedTxLookup.refresh(11). Nothing left behind. - Temporary-manager leaks in the wiper and the onboarding provisioning paths are closed on every throw path (the
2da667ce7follow-up covers both the collection loop and the deletion loop under onedo/catch— confirmed). ShieldedTxLookupreading through a privateModelContextin a detached task, guarded by both the generation counter andmodelContainer === container, correctly prevents a slow read from an old network replacing newer state.
Blocker: merge order
This depends on dashpay/platform#4469, which is still open against v4.2-dev. PlatformWalletManager.shutdown() and PlatformWalletShutdownMetrics do not exist on v4.2-dev today, swift-sdk is wired in as a local SPM package, and this repo has no build CI (only PR-title validation + CodeRabbit). If this merges first, develop stops compiling for everyone and nothing catches it. Please land #4469 first.
Please fix before merge
1. A failed switch blocks the whole app with no way out — SwiftDashSDKWalletRuntime.swift:212 → SettingsScreen.swift:382
In .failed the overlay stays up in its own UIWindow at .alert + 1 and the only affordance is Retry. By that point the network key has already been rewritten to the destination and the old runtime is torn down. A reproducible case: a wallet that exists only on mainnet → switch to testnet → host.start throws walletNotFound(testnet) → fullReset → .failed, and Retry deterministically fails the same way. The user cannot get back to Settings or anywhere else — force-quit is the only exit, and after relaunch they are still on the broken network. Before this PR the same situation left the app runtime-less but navigable.
Suggest adding a second action to the failed card — "Back to <from>" — that rolls the persisted network key back and switches to the origin network.
2. Retry can leave the overlay up permanently — SwiftDashSDKWalletRuntime.swift:174
The early no-op branch returns without calling NetworkTransitionState.shared.finish(). If the runtime comes up on its own after a .failed switch (a background refresh via platformSyncRearm / startIfReady), Retry lands in exactly that branch: the runtime is ready, the phase stays .failed, and the blocking overlay can no longer be dismissed by anything. One-line fix: clear the phase in the no-op branch when it isn't already .idle.
Non-blocking notes
- No tests. The
NetworkTransitionStatephase machine and theShieldedTxLookupgeneration/staleness logic are both cheap to unit test and are exactly the parts where a regression would be silent. SDK(network:)(~1–2s, prefetches quorums over the network) is still on the main thread. Acknowledged in the code and covered by the overlay, which is a fine stage 1 — but worth being explicit that the hitch is hidden, not gone.NetworkSwitchOverlayPresenteris app-scoped but lives inSettingsScreen.swift. Matches the append-to-existing-file convention, but nobody will look for it there.stopAsyncdoesawait drainWatch?.value. If that task is ever parked in a synchronous FFI call that doesn't observe cancellation, the overlay spins forever. The comment argues it can't happen; that's an assumption rather than a guarantee.
Happy to re-review as soon as 1 and 2 are addressed.
🤖 Reviewed with Claude Code
2 participants
Issue being fixed or feature implemented
Switching between mainnet and testnet could freeze the UI for 30–60 seconds while PlatformWalletManager performed blocking native teardown on the main thread. After moving teardown off-main, a shorter post-ready hitch remained because ShieldedTxLookup synchronously queried SwiftData mainContext after shielded sync completion.
Depends on dashpay/platform#4469.
What was done?
How Has This Been Tested?
Breaking Changes
None.
Checklist:
For repository code-owners and collaborators only
Summary by CodeRabbit
New Features
Bug Fixes