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feat(desktop): instant startup from persisted library snapshot

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Seed self.library from load_library_snapshot before spawning the scan thread,
so a warm launch renders the library immediately (status '… refreshing…')
instead of a blank/scanning window. Write the snapshot after every scan (the
startup thread and rescan). The background scan is unchanged and still swaps
in authoritative data; the snapshot only ever shows briefly-stale state.

Verified live against the real 5574-video library: second launch renders the
full list within 2s (well under the ~64s cold scan) with the refreshing
status; deleting the snapshot row falls back to the scanning spinner.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Luna 2026-07-09 21:19:13 -07:00
parent 5a55c15209
commit 3e6bcfb564
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1 changed files with 17 additions and 2 deletions
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19
src/app.rs
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@ -482,7 +482,20 @@ impl App {
// DB lookups that don't depend on the scan, so they stay synchronous.
let (library_load_tx, library_load_rx) =
std::sync::mpsc::channel::<Vec<library::Channel>>();
let status = "Scanning library…".to_string();
// Instant startup: if we persisted the library last run, show it
// immediately while the (slow, disk-bound) rescan runs in the
// background and swaps in fresh data via `library_load_rx`.
let seeded_library: Vec<library::Channel> =
db.load_library_snapshot(&channels_root).unwrap_or_default();
let status = if seeded_library.is_empty() {
"Scanning library…".to_string()
} else {
format!(
"{} channels, {} videos (refreshing…)",
seeded_library.len(),
seeded_library.iter().map(|c| c.total_videos()).sum::<usize>()
)
};
{
let db = db.clone();
let channels_root = channels_root.clone();
@ -502,12 +515,13 @@ impl App {
if let Err(e) = db.sync_search_index(&library::build_search_entries(&library)) {
eprintln!("search index sync failed: {e}");
}
db.save_library_snapshot(&channels_root, &library);
let _ = library_load_tx.send(library);
ctx.request_repaint(); // wake update() to swap the result in
})
.ok();
}
let library: Vec<library::Channel> = Vec::new();
let library: Vec<library::Channel> = seeded_library;
let folders = db.list_folders().unwrap_or_default();
let watched = db.get_watched().unwrap_or_default();
let flags = db.get_video_flags().unwrap_or_default();
@ -804,6 +818,7 @@ impl App {
self.thumb_pending.retain(|p| valid.contains(p));
// Bump the generation so the card cache recomputes against the new library.
self.library_generation += 1;
self.db.save_library_snapshot(&self.channels_root, &self.library);
self.status = format!(
"Rescanned: {} channels, {} videos",
self.library.len(),