- Add Force bool field to ScanLibraryRequest in handlers
- Pass force param through job params to worker
- Add forceRescan field and SetForce method to MediaScanner
- Modify processMediaFile to delete and re-create existing items when force=true
- Default behavior unchanged (force=false maintains skip-if-exists)
- Add extractEPUBCover() to extract embedded covers from EPUB files
- Parse OPF manifest for cover-image properties
- Support meta name="cover" tags
- Fall back to common cover paths (cover.jpg, images/cover.jpg)
- Add findSidecarCover() for sidecar cover detection
- Check cover.jpg, cover.png, cover.webp
- Check folder.jpg, folder.png
- Check {basename}.jpg (same name as media file)
- Add extractPDFCover() to extract first page images from PDFs
- Use pdfcpu API to extract images from page 1
- Save largest image as cover
- Update extractPDFMetadata() to use pdfcpu API
- Extract Title, Author, Subject, Creator, Producer
- Call extractPDFCover for embedded covers
- Fall back to sidecar covers
- Update extractMetadata() for EPUB to call extractEPUBCover
- Try embedded cover first, then sidecar
Implements comprehensive progress tracking for scan jobs to provide real-time
statistics to the frontend (files_scanned, new_items, errors).
Changes:
1. Extended JobResult struct with new fields:
- FilesScanned: total files processed
- NewItems: books added to database
- Errors: scan errors encountered
2. Added progress callback mechanism:
- Job.ProgressCallback function field for real-time updates
- Job.UpdateProgress() method to trigger callbacks
- Worker stores callback and updates JobResult during scan
3. MediaScanner now tracks statistics:
- totalFiles, newItems, errors counters
- GetStats() method to retrieve statistics
- First pass counts total files for progress calculation
- Batches progress updates every 10 files (reduces mutex contention)
- Final update ensures 100% progress is reported
4. Updated processMediaFile signature:
- Returns (bool, error) instead of (error)
- true = new item created, false = existing/updated/error
- Increments newItems counter when creating database entries
- Updated WatchChanges to handle new return value
5. Worker job completion extracts stats:
- Parses result map for files_scanned, new_items, errors
- Stores in final JobResult for API response
6. GetScanStatus API response includes new fields:
- files_scanned, new_items, errors now in JSON response
- Frontend can display real-time progress
Design decisions:
- Batching every 10 files balances performance vs. granularity
- Thread-safe via worker mutex (w.mu.Lock/Unlock)
- Callback pattern decouples scanner from job management
- processMediaFile return type allows tracking new vs. updated items
- Maintains backward compatibility (uses || 0 fallbacks in frontend)
Testing:
- All code compiles successfully
- Follows service layer pattern (no business logic in handlers)
- No database schema changes
- Integration tests to be added in Step 8 (separate commit)
Files modified:
- internal/services/worker.go (JobResult, Job struct, processScanJob, processJob)
- internal/services/media_scanner.go (struct fields, GetStats, ScanFolders, processMediaFile)
- internal/handlers/scanner.go (GetScanStatus response)
Related: TASKS-backend-progress-tracking.md Steps 1-7
Enhance NormalizeISBN to validate and convert ISBNs:
- Validate length (10 or 13 digits), return error if invalid
- Convert ISBN-10 to ISBN-13 by prefixing '978' and recalculating checksum
- Add NormalizeISBNSafe for backward compatibility in scanners
This ensures all ISBNs stored in database are valid ISBN-13 format.
john-okeefe