Monitors all registered folders using OS-native events (ReadDirectoryChangesW
on Windows) so new, modified, and deleted files are reflected in the gallery
automatically without manual reindexing.
Key design points:
- Adaptive blocking: recv() when no events pending (zero CPU), switches to
recv_timeout(earliest_deadline) only when debounce timers are running — wakes
exactly when the soonest event is ready, no busy-polling
- 500 ms per-path debounce coalesces rapid OS event bursts into one action
- Change detection preserved: build_record skips upsert if file_size + mtime
unchanged, preventing spurious thumbnail/embedding re-queues and avoiding
clobbering of existing metadata like thumbnail_path
- Access events (reads) filtered out; only Create/Modify/Remove trigger work
- Deletion path: emits watcher-deleted event with image IDs; frontend removes
those images from state and clears selectedImage if it was deleted
WatcherHandle stored in app state; add_folder / remove_folder / update_folder_path
commands keep the watched path set in sync with the DB.
LyAhn
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