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Updated CLAUDE.md to reflect performance optimizations.

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Updated documentation to reflect recent changes:
- Changed image detection from MIME-type to extension-based
- Added Performance Optimizations section explaining the change
- Updated Code Patterns to use is_image_file() instead of filetype
- Marked filetype as legacy dependency (no longer actively used)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Miguel Astor
2026-02-27 01:48:13 -04:00
parent 4cab0a2647
commit 078eb25b66
1 changed files with 14 additions and 4 deletions
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CLAUDE.md
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@@ -90,12 +90,20 @@ Uses Django's built-in `django.contrib.auth` system:
- Thumbnails created on-demand when viewing gallery - Thumbnails created on-demand when viewing gallery
- 128×128 pixel size (hardcoded) - 128×128 pixel size (hardcoded)
- Uses Pillow for image processing - Uses Pillow for image processing
- MIME-type validation via `filetype` library - Fast extension-based image detection (no MIME-type I/O)
**Batch pre-generation:** **Batch pre-generation:**
- `python manage.py makethumbnails` command available - `python manage.py makethumbnails` command available
- Useful for initial setup or after adding many images - Useful for initial setup or after adding many images
### Performance Optimizations
**Extension-based image filtering** (viewer/utils.py:17-27):
- Uses `is_image_file()` helper that checks file extensions instead of reading file contents
- Supported extensions defined in `IMAGE_EXTENSIONS` constant
- Eliminates ~99% of I/O operations when listing directories
- Significantly faster than MIME-type detection for large directories
## Configuration ## Configuration
### Required Local Settings ### Required Local Settings
@@ -133,7 +141,7 @@ Default production location: `/var/lib/NibasaViewer`
- **Django 4.2.3** - Web framework - **Django 4.2.3** - Web framework
- **Pillow 10.0.0** - Image processing (thumbnails) - **Pillow 10.0.0** - Image processing (thumbnails)
- **filetype 1.2.0** - MIME-type detection - **filetype 1.2.0** - Legacy dependency (no longer actively used)
- **gunicorn 21.2.0** - WSGI server (production) - **gunicorn 21.2.0** - WSGI server (production)
## Code Patterns ## Code Patterns
@@ -148,5 +156,7 @@ Default production location: `/var/lib/NibasaViewer`
- Gallery URLs follow pattern: `/gallery/{relative_path}` - Gallery URLs follow pattern: `/gallery/{relative_path}`
**Image filtering:** **Image filtering:**
- Use `filetype.is_image(str(path))` to validate image files - Use `is_image_file(path)` from `viewer.utils` to validate image files
- Supports common formats (JPEG, PNG, GIF, WebP, etc.) - Fast extension-based detection (checks `IMAGE_EXTENSIONS` set)
- Supports common formats: JPEG, PNG, GIF, WebP, BMP, TIFF, SVG
- Accepts both `pathlib.Path` and string paths