yonlu
42add7fec4
- Create 09-01-SUMMARY.md with execution metrics and decisions - Update STATE.md with plan progress and session continuity - Update ROADMAP.md: mark 09-01 plan complete - Mark SCAN-01, SCAN-02, SCAN-03 requirements complete
113 lines
4.3 KiB
Markdown
113 lines
4.3 KiB
Markdown
---
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phase: 09-scan-cancellation-keyboard-shortcuts
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plan: 01
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subsystem: library
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tags: [context-cancellation, scan-control, wails-binding, goroutine-coordination]
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# Dependency graph
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requires:
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- phase: 08-infrastructure
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provides: Library struct, Scan() pipeline, events system
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provides:
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- CancelScan, PauseScan, ResumeScan Wails-bound methods on Library
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- IsScanActive, IsScanPaused state query methods
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- waitIfPaused internal pause checkpoint helper
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- LibraryScanCancelled, LibraryScanPaused, LibraryScanResumed events
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- ScanMetrics.Cancelled field
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affects: [09-scan-cancellation-keyboard-shortcuts]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Per-scan cancellable context (scanCtx) threaded through pipeline, app context (l.ctx) for DB ops"
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- "Blocking channel pattern for pause/resume (scanPauseCh closed to unblock all workers)"
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- "Mutex-protected scan state fields with deferred cleanup"
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key-files:
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created:
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- backend/library/scan_control.go
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modified:
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- backend/events/events.go
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- frontend/src/events.ts
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- backend/library/library.go
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- backend/library/metrics.go
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key-decisions:
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- "scanCtx for worker cancellation, l.ctx for DB transactions — ensures in-flight commits complete"
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- "Blocking channel pattern for pause — workers check waitIfPaused before each extraction"
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- "Orphan cleanup and variant generation skipped on cancel — prevents incorrect file deletion"
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patterns-established:
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- "Per-operation cancellable context pattern: create child context at operation start, defer cancel, clean up state in defer"
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- "Channel-based pause/resume: create channel on pause, close on resume, select with ctx.Done for cancel-during-pause"
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requirements-completed: [SCAN-01, SCAN-02, SCAN-03]
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# Metrics
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duration: 16min
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completed: 2026-03-07
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---
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# Phase 9 Plan 01: Scan Control Backend Summary
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**Per-scan cancellable context with pause/resume channel coordination and 3 new scan lifecycle events**
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## Performance
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- **Duration:** 16 min
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- **Started:** 2026-03-07T02:14:23Z
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- **Completed:** 2026-03-07T02:31:08Z
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- **Tasks:** 2
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- **Files modified:** 5
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## Accomplishments
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- Created scan_control.go with CancelScan/PauseScan/ResumeScan/IsScanActive/IsScanPaused methods
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- Threaded per-scan cancellable context through walk and worker pipeline (3 select statements)
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- Added waitIfPaused checkpoint in worker pool so workers block when paused
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- Orphan cleanup and variant generation safely skipped on cancelled scans
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- Added LibraryScanCancelled/Paused/Resumed events with TypeScript sync via go generate
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add scan control events and metrics fields** - `c695024` (feat)
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2. **Task 2: Add scan control fields to Library struct and create scan_control.go** - `cf22e52` (feat)
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## Files Created/Modified
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- `backend/library/scan_control.go` - CancelScan, PauseScan, ResumeScan, IsScanActive, IsScanPaused, waitIfPaused
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- `backend/events/events.go` - LibraryScanCancelled, LibraryScanPaused, LibraryScanResumed constants
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- `frontend/src/events.ts` - Auto-generated TypeScript event constants
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- `backend/library/library.go` - Scan control fields on Library struct, per-scan context threading, cancellation-aware orphan/variant phases
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- `backend/library/metrics.go` - Cancelled bool field on ScanMetrics
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## Decisions Made
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- Used scanCtx for worker cancellation and l.ctx for DB transactions — ensures in-flight batch commits always complete even when scan is cancelled
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- Blocking channel pattern for pause — `make(chan struct{})` on pause, `close()` on resume, all workers select against it
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- Orphan cleanup and variant generation skipped on cancel — existingPaths still contains unvisited files that would be incorrectly deleted
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Scan control backend complete, ready for Plan 02 (keyboard shortcuts config) and Plan 03 (frontend scan control UI)
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- All 5 new methods are exported and Wails-bindable
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- Events synced to TypeScript for frontend consumption
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## Self-Check: PASSED
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- All 5 key files verified on disk
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- Both task commits found in git log (c695024, cf22e52)
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---
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*Phase: 09-scan-cancellation-keyboard-shortcuts*
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*Completed: 2026-03-07*
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