feat(queue): implement concurrent deduplication and safe backend detachment

- Add backendRegisteredIds and backendDispatchPromises for single dispatch enforcement

- Add detach_download_for_reconfigure to safely modify properties of active downloads

- Add applyProperties logic handling completed, failed, paused, and active queues

- Add extractValidDownloadUrls and fix multi-url paste handling

- Setup vitest and add useDownloadStore unit tests for backend registration lifecycle
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NimBold
2026-06-20 11:41:55 +03:30
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# Firelink interaction/functionality review
# Firelink UI Interaction Inventory
Date: 2026-06-19
## 1. Main Window & Sidebar
## Review method
### Sidebar Actions
- **Select Filter/Category/Queue**
- **Location**: Sidebar item clicks (`NavItem`, `QueueItem`).
- **Component**: `Sidebar.tsx` (`onSelectFilter`)
- **Store Action**: `useSettingsStore.setActiveView('downloads')`, updates local state filter.
- **Expected**: Main table filters to show matching downloads.
- **Add Queue**
- **Location**: Sidebar '+' button.
- **Component**: `Sidebar.tsx` (`handleAddQueueSubmit`)
- **Store Action**: `useDownloadStore.addQueue()`
- **Expected**: A new custom queue is created.
- **Queue Context Menu**
- **Location**: Right-click on a custom queue.
- **Component**: `Sidebar.tsx` (`handleQueueContextMenu`)
- **Actions**:
- **Start Queue**: `useDownloadStore.startQueue()` -> IPC `start_download` (for active items)
- **Pause Queue**: `useDownloadStore.pauseQueue()` -> IPC `pause_download`
- **Rename Queue**: `useDownloadStore.renameQueue()`
- **Delete Queue**: `useDownloadStore.removeQueue()` -> IPC `db_delete_queue`
- **Expected**: Context menu opens, performing the respective queue manipulation.
- **Resize Sidebar**
- **Location**: Sidebar drag handle.
- **Component**: `App.tsx` (`startSidebarResize`)
- **Expected**: Drags and resizes the sidebar width dynamically.
Code-traced visible UI actions through React components, Zustand stores, typed IPC wrappers, registered Tauri commands, Rust side effects, and frontend update/error paths. Build and Rust tests were run after fixes.
### Main Toolbar
- **Toggle Sidebar**
- **Location**: Top-left icon (when sidebar is hidden).
- **Component**: `DownloadTable.tsx` / `Sidebar.tsx`
- **Store Action**: `useSettingsStore.toggleSidebar()`
- **Add Download**
- **Location**: '+' Button.
- **Component**: `DownloadTable.tsx`
- **Store Action**: `useDownloadStore.toggleAddModal(true)`
- **Resume All / Pause All**
- **Location**: Toolbar Play/Pause icons.
- **Component**: `DownloadTable.tsx`
- **Store Action**: `handleResume` -> `resumeDownload`, `handlePause` -> IPC `pause_download`
- **Rust**: `commands::pause_download`
- **Expected**: Iterates through visible items and pauses/resumes them.
## Root causes found
## 2. Download Table
1. The handwritten frontend IPC map had drifted from generated Rust bindings.
- Queue reordering sent `Up`/`Down`, but Rust deserializes `QueueDirection` as lowercase `up`/`down`.
- **Table Column Resize**
- **Location**: Table headers drag handle.
- **Component**: `DownloadTable.tsx` (`startColumnResize`)
- **Expected**: Modifies local state grid template widths.
- **Row Double Click**
- **Location**: Table row.
- **Component**: `DownloadTable.tsx` (`handleDownloadDoubleClick`)
- **Expected**: If completed, opens file (IPC `open_downloaded_file`). Otherwise, opens properties (`useDownloadStore.setSelectedPropertiesDownloadId`).
- **Row Context Menu (Right Click)**
- **Location**: Table row.
- **Component**: `DownloadTable.tsx`
- **Actions**:
- **Open**: IPC `open_downloaded_file` -> Rust `commands::open_downloaded_file`
- **Show in Finder**: IPC `reveal_in_file_manager` -> Rust `commands::reveal_in_file_manager`
- **Pause**: IPC `pause_download` -> Rust `commands::pause_download`
- **Resume**: `useDownloadStore.resumeDownload()` -> IPC `resume_download` -> Rust `commands::resume_download`
- **Redownload**: `useDownloadStore.redownload()` -> IPC `remove_download` -> Rust `commands::enqueue_download`
- **Copy Address**: `navigator.clipboard.writeText(url)`
- **Copy File Path**: `navigator.clipboard.writeText(fullPath)`
- **Remove**: `useDownloadStore.openDeleteModal()`
- **Properties**: `useDownloadStore.setSelectedPropertiesDownloadId()`
2. Some UI buttons were visually present but not wired.
- Add Download `Refresh Metadata` had no click handler.
## 3. Add Downloads Window
3. Some UI promises did not match the backend side effect.
- Settings global speed limit was labeled KiB/s, but bare numeric input was passed as bytes/s.
- Download Properties allowed editing speed for active transfers even though no backend command applied a per-download active speed change.
- **Input URLs**
- **Location**: Main textarea.
- **Component**: `AddDownloadsModal.tsx`
- **Expected**: Parses text, fetches metadata (IPC `fetch_metadata` or `fetchMediaMetadataDeduped`), and populates preview list.
- **Refresh Metadata**
- **Location**: "Refresh Metadata" button.
- **Component**: `AddDownloadsModal.tsx`
- **Expected**: Re-triggers metadata fetch for URLs.
- **Preview List Selection**
- **Location**: Preview items list.
- **Component**: `AddDownloadsModal.tsx` (`setSelectedItemIndex`)
- **Expected**: Updates the right-side form to reflect the selected item's specific options.
- **Media Format Selection**
- **Location**: Format list (if media).
- **Component**: `AddDownloadsModal.tsx` (`selectMediaFormat`)
- **Expected**: Updates the selected format, updating estimated sizes and file extensions.
- **Browse Save Location**
- **Location**: "Select" button next to save location.
- **Component**: `AddDownloadsModal.tsx` (`handleBrowse`)
- **Expected**: Opens Tauri native directory picker.
- **Options Toggles & Inputs**
- **Location**: Right-side pane.
- **Actions**: Change connections, toggle speed limit, set username/password, expand advanced, toggle checksum, edit headers/cookies/mirrors.
- **Expected**: Mutates local component state for the download configuration.
- **Start / Add to Queue**
- **Location**: Bottom right buttons.
- **Component**: `AddDownloadsModal.tsx` (`handleStart`)
- **Store Action**: `useDownloadStore.addDownload()`
- **IPC Command**: `enqueue_download` (called by store)
- **Rust**: `commands::enqueue_download`
- **Validation**: Checks for duplicates on disk (IPC `check_file_exists`) and in store, potentially opening `DuplicateResolutionModal`.
4. Duplicate-resolution semantics were too broad.
- The duplicate dialog offered `Replace` for URL duplicates, but replacement only makes sense for destination-file conflicts.
## 4. Download Properties Window
5. File-path actions used inconsistent destination resolution.
- `Copy File Path` bypassed the same effective destination logic used by Open/Reveal.
- **Browse Save Location**
- **Location**: "Select" button.
- **Component**: `PropertiesModal.tsx`
- **Expected**: Opens Tauri native directory picker.
- **Form Inputs**
- **Location**: Text inputs and selects.
- **Component**: `PropertiesModal.tsx`
- **Expected**: Adjusts URL, filename, connections, speed limits, auth (matches/custom/none), advanced settings. Disabled if the download is locked/active.
- **Save Changes**
- **Location**: "Save" button.
- **Component**: `PropertiesModal.tsx`
- **Store Action**: `useDownloadStore.updateDownload()`
- **Expected**: Validates inputs, saves to store, syncs to DB.
6. Clipboard actions lacked visible error handling.
- Copy failures were previously silent.
## 5. Settings Window
## Fixed
- **Tab Navigation**
- **Location**: Top horizontal tabs.
- **Store Action**: `useSettingsStore.setActiveSettingsTab()`
- **Downloads Settings**
- **Location**: "Downloads" tab.
- **Actions**: Change default connections, parallel downloads (IPC `set_concurrent_limit`), global speed limit (IPC `set_global_speed_limit`), max retries, notification toggles.
- **Look and feel**
- **Location**: "Look and feel" tab.
- **Actions**: Theme switch, font size, density, dock badge toggle (IPC `update_dock_badge`), menu bar icon (IPC `toggle_tray_icon`).
- **Network**
- **Location**: "Network" tab.
- **Actions**: Change proxy mode/host/port, custom user agent.
- **Locations**
- **Location**: "Locations" tab.
- **Actions**:
- Browse Default Path
- Toggle "Ask where to save"
- Browse "All Categories Base" -> Tauri Picker -> IPC `create_category_directories` -> Rust `commands::create_category_directories`
- Browse specific category paths.
- Reset Defaults: `useSettingsStore.resetCategoryDirectories()`
- **Site Logins**
- **Location**: "Site Logins" tab.
- **Actions**:
- Add Login: IPC `set_keychain_password` -> `useSettingsStore.addSiteLogin()`
- Delete Login (Trash icon): IPC `delete_keychain_password` -> `useSettingsStore.removeSiteLogin()`
- **Engine**
- **Location**: "Engine" tab (when mounted).
- **Component**: `SettingsView.tsx` (`runEngineChecks`)
- **IPC**: `get_aria2_engine_status`, `get_ytdlp_engine_status`, `get_ffmpeg_engine_status`, `get_deno_engine_status`.
- **Expected**: Polls backend for binary status and updates UI. Re-triggered with "Refresh" button.
### Main window
## 6. Other Modals & Actions
| Surface/action | Status after review | Notes |
| --- | --- | --- |
| Start/resume paused or failed download | Works | Store enqueues through `enqueue_download`; existing aria2 GID resume path is handled by backend. |
| Pause active/queued/retrying download | Works | Frontend calls `pause_download`; backend removes pending task and pauses/removes active work as appropriate. |
| Remove download | Works | Frontend calls `remove_download`, then removes local persisted item. |
| Delete file with remove | Works | Uses `trash_download_assets` with backend ownership/path authorization. |
| Redownload | Works | Creates a new queued item with preserved metadata and enqueues through queue manager. |
| Open downloaded file | Works | Uses owned-path `open_downloaded_file`. |
| Show in Finder | Works for completed files/partials | Uses owned-path `reveal_in_file_manager`; non-completed double-click/menu behavior opens properties. |
| Copy URL/address | Fixed | Now reports clipboard errors. |
| Copy file path | Fixed | Now uses the same effective path resolution as file actions and reports clipboard errors. |
| Queue up/down ordering | Fixed | Sends lowercase `up`/`down` to match Rust-generated `QueueDirection`. |
| Double-click completed download | Works | Opens file; otherwise opens Properties. |
| Status/progress/speed/ETA updates | Works | Store listener handles progress/state events; existing media-size finalization behavior is preserved. |
| Column resize/layout | Works | Local UI-only state; no backend side effect. |
### Add Download window
| Surface/action | Status after review | Notes |
| --- | --- | --- |
| URL/multiple URL input | Works | Lines are parsed and invalid URLs surface per-item error state. |
| Paste/deep-link/extension prefill | Works | App-level paste/deep-link/extension handlers open the modal with URLs. |
| Metadata detection | Works | HTTP metadata and media metadata go through IPC. |
| Refresh Metadata | Fixed | Button now re-runs the existing parser/metadata flow. |
| Media format selection | Works | Selected format selector/ext is applied before enqueue. |
| File name/category/destination detection | Works | Category-specific destination routing is preserved. |
| Destination folder selection | Works | Uses Tauri directory picker. |
| Auth/site-login credentials | Works | Keychain-backed site-login password lookup is preserved. |
| Add paused / start queued | Works | Adds local item and enqueues when start is requested. |
| Duplicate URL conflict | Fixed | `Replace` is no longer offered for URL-only duplicates. |
| Duplicate file conflict | Works | Rename/replace/skip flows remain available for file conflicts. |
| Cancel/close | Works | Modal state is reset through store. |
### Download Properties
| Surface/action | Status after review | Notes |
| --- | --- | --- |
| Opens for queued/downloading/paused/failed/completed | Works | Selected item is read live from store. |
| Live progress/speed/ETA/size summary | Works | Summary uses current store item, not stale initial-only form state. |
| Save editable queued/paused/failed settings | Works | Updates local persisted item used by resume/redownload/enqueue paths. |
| Completed download settings for redownload | Works | Identity remains read-only; transfer settings can be saved for redownload. |
| Active-transfer speed controls | Fixed | Controls are locked while transfer is active; copy now states that current backend options remain active until pause/stop. |
| Browse destination | Works when not locked | Uses directory picker. |
### Settings
| Tab/action | Status after review | Notes |
| --- | --- | --- |
| Downloads tab settings | Fixed/Works | Bare global speed-limit values now normalize as KiB/s for live backend calls and newly queued downloads. |
| Look and feel tab | Works | Theme, font size, row density, dock badge, menu bar icon persist and drive app effects. |
| Network tab | Works | Proxy mode/host/port/user-agent values are used for enqueue payloads. |
| Locations tab | Works | Default/category paths persist; bulk category creation calls backend. |
| Site Logins tab | Works | Add/remove uses settings plus keychain password storage/deletion. |
| Power tab | Works | Prevent-sleep setting drives backend keep-awake effect. |
| Engine tab diagnostics | Works | Recheck calls registered engine status commands and surfaces errors/details. |
| Integrations tab | Works | Token copy/regenerate and extension pairing token updates are wired; token remains keychain-backed. |
| About tab updates | Works | Check Now calls update check and surfaces result via toast. |
### Menus/context menus/dialog buttons
| Surface/action | Status after review | Notes |
| --- | --- | --- |
| Download row context menu | Fixed/Works | Copy actions now resolve correctly and surface errors; start/pause/remove/redownload/properties remain wired. |
| Sidebar queue context menu | Works | Start/pause/rename/remove queues are wired through store. |
| Delete confirmation dialog | Works | Remove-only and remove+trash paths preserved. |
| Duplicate resolution dialog | Fixed | Replacement is now file-conflict-only. |
### Backend IPC coverage
| Check | Status |
| --- | --- |
| Frontend IPC command names exist in Rust registration | Works |
| Queue direction argument casing | Fixed |
| Global speed-limit unit handling | Fixed in frontend and backend startup/live command handling |
| File open/reveal/trash path authorization | Preserved |
| Generic duplicate-check/delete path guards | Preserved; no security loosening introduced |
## Not fixed / follow-up
- Full packaged GUI/manual click-through was not launched in this pass; validation was code-trace plus `npm run build` and Rust tests.
- Existing generic `check_file_exists` / `delete_file` remain scoped by `is_safe_path`, but they are broader than ownership-based open/reveal/trash commands. I did not loosen them. A future hardening pass should replace duplicate-file replacement with an explicit user-selected-destination trash command or ownership-aware pre-registration flow.
- Per-download speed changes for already-running transfers are not implemented because the current backend has no active-transfer per-item speed-limit IPC. The UI now stops promising that behavior.
## Validation
- `npm run build`: pass
- `cd src-tauri && cargo test --quiet`: pass
- **Delete Confirmation Modal**
- **Location**: Prompt when removing a download.
- **Component**: `DeleteConfirmationModal.tsx`
- **Actions**:
- Remove from list: `useDownloadStore.removeDownload()` -> IPC `db_delete_download`
- Delete file & remove: `useDownloadStore.removeDownload()` + IPC `trash_download_assets` -> Rust `commands::trash_download_assets`
- **Duplicate Resolution Modal**
- **Location**: Triggered when adding a download that already exists.
- **Component**: `DuplicateResolutionModal.tsx`
- **Actions**: Select "Rename", "Replace", or "Skip".
- **Expected**: Modifies the batch of downloads added via `executeAddDownloads`.
- **Quality Modal**
- **Location**: Triggered when an active media download requires format resolution.
- **Component**: `QualityModal.tsx`
- **Expected**: Approves formats via local store or cancels metadata request.
- **Global Keyboard Shortcuts**
- **Location**: `App.tsx` (paste event listener)
- **Expected**: Pasting URLs anywhere outside inputs triggers `useDownloadStore.openAddModalWithUrls(text)`.
- **System Sleep / Power**
- **Location**: "Power" tab.
- **Expected**: Interacts with IPC `set_prevent_sleep` -> Rust `commands::set_prevent_sleep`.
## Likely Validation Methods
- **UI State**: Checking Zustand store (`useDownloadStore`, `useSettingsStore`) and React DevTools.
- **Rust Backend**: Monitoring standard output/stderr for `Invoke command` errors, and inspecting `src-tauri/src/commands.rs`.
- **File System**: Checking disk for queue persistence and newly created directories (e.g. `create_category_directories`).