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Optimize playlist loading on Library page

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This commit is contained in:
Julien Maille 2026-01-11 09:47:43 +01:00
parent 9d3f7e85c1
commit 7e53535d30
1 changed files with 56 additions and 2 deletions
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58
js/db.js
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@ -303,6 +303,26 @@ export class MusicDatabase {
}
}
_updatePlaylistMetadata(playlist) {
playlist.numberOfTracks = playlist.tracks ? playlist.tracks.length : 0;
if (!playlist.cover) {
const uniqueCovers = [];
const seenCovers = new Set();
const tracks = playlist.tracks || [];
for (const track of tracks) {
const cover = track.album?.cover;
if (cover && !seenCovers.has(cover)) {
seenCovers.add(cover);
uniqueCovers.push(cover);
if (uniqueCovers.length >= 4) break;
}
}
playlist.images = uniqueCovers;
}
return playlist;
}
// User Playlists API
async createPlaylist(name, tracks = [], cover = '') {
const id = crypto.randomUUID();
@ -313,6 +333,7 @@ export class MusicDatabase {
cover: cover,
createdAt: Date.now(),
};
this._updatePlaylistMetadata(playlist);
await this.performTransaction('user_playlists', 'readwrite', (store) => store.put(playlist));
return playlist;
}
@ -324,6 +345,7 @@ export class MusicDatabase {
const minifiedTrack = this._minifyItem('track', track);
if (playlist.tracks.some((t) => t.id === track.id)) return;
playlist.tracks.push(minifiedTrack);
this._updatePlaylistMetadata(playlist);
await this.performTransaction('user_playlists', 'readwrite', (store) => store.put(playlist));
return playlist;
}
@ -333,6 +355,7 @@ export class MusicDatabase {
if (!playlist) throw new Error('Playlist not found');
playlist.tracks = playlist.tracks || [];
playlist.tracks = playlist.tracks.filter((t) => t.id !== trackId);
this._updatePlaylistMetadata(playlist);
await this.performTransaction('user_playlists', 'readwrite', (store) => store.put(playlist));
return playlist;
}
@ -348,12 +371,42 @@ export class MusicDatabase {
async getPlaylists() {
const db = await this.open();
return new Promise((resolve, reject) => {
const transaction = db.transaction('user_playlists', 'readonly');
const transaction = db.transaction('user_playlists', 'readwrite'); // Changed to readwrite for lazy migration
const store = transaction.objectStore('user_playlists');
const index = store.index('createdAt');
const request = index.getAll();
request.onsuccess = () => {
resolve(request.result.reverse()); // Newest first
const playlists = request.result.reverse(); // Newest first
const processedPlaylists = playlists.map((playlist) => {
let needsUpdate = false;
// Lazy migration for numberOfTracks
if (typeof playlist.numberOfTracks === 'undefined') {
playlist.numberOfTracks = playlist.tracks ? playlist.tracks.length : 0;
needsUpdate = true;
}
// Lazy migration for images (collage)
if (!playlist.cover && (!playlist.images || playlist.images.length === 0)) {
this._updatePlaylistMetadata(playlist);
needsUpdate = true;
}
if (needsUpdate) {
// We are in a readwrite transaction, so we can put back
try {
store.put(playlist);
} catch (e) {
console.warn('Failed to update playlist metadata', e);
}
}
// Return lightweight copy without tracks
// eslint-disable-next-line no-unused-vars
const { tracks, ...minified } = playlist;
return minified;
});
resolve(processedPlaylists);
};
request.onerror = () => reject(request.error);
});
@ -371,6 +424,7 @@ export class MusicDatabase {
const playlist = await this.performTransaction('user_playlists', 'readonly', (store) => store.get(playlistId));
if (!playlist) throw new Error('Playlist not found');
playlist.tracks = tracks;
this._updatePlaylistMetadata(playlist);
await this.performTransaction('user_playlists', 'readwrite', (store) => store.put(playlist));
return playlist;
}