Initial commit - SoundWave v1.0
- Full PWA support with offline capabilities - Comprehensive search across songs, playlists, and channels - Offline playlist manager with download tracking - Pre-built frontend for zero-build deployment - Docker-based deployment with docker compose - Material-UI dark theme interface - YouTube audio download and management - Multi-user authentication support
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docs/PLAYLIST_SYNC_FIX.md
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docs/PLAYLIST_SYNC_FIX.md
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# Playlist Sync Fix - December 16, 2025
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## Issue Summary
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Playlists were not automatically fetching new songs added to YouTube playlists. When a user added a second song to the "Blues" playlist on YouTube, the app did not download it even after an hour.
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## Root Causes Identified
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### 1. **Inefficient Playlist Linking in Download Task**
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**Problem**: After downloading each audio file, the `download_audio_task` was iterating through ALL playlists and fetching each one from YouTube to check if the video belongs to it.
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**Code Location**: `backend/task/tasks.py` lines 68-97
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**Impact**:
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- Downloads appeared "stuck" for 1-2 minutes
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- Wasted YouTube API calls
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- Blocked worker threads unnecessarily
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- Could cause timeouts on large playlists
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**Solution**: Replaced synchronous playlist linking with an async task `link_audio_to_playlists` that runs after download completion. This prevents blocking the download task.
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### 2. **Timezone Warnings**
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**Problem**: Code used `datetime.now()` instead of `timezone.now()` causing Django warnings.
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**Code Location**: Multiple locations in `backend/task/tasks.py`
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**Impact**:
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- Polluted logs with warnings
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- Could cause incorrect datetime comparisons in different timezones
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**Solution**: Imported `django.utils.timezone` and replaced all `datetime.now()` with `timezone.now()`
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### 3. **Sync Frequency Too Low**
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**Problem**: Periodic sync was running every 30 minutes, making users wait up to 30 minutes for new content.
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**Code Location**: `backend/config/celery.py` line 18
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**Solution**: Changed sync frequency from 30 minutes to 15 minutes for faster content discovery.
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## Changes Made
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### File: `backend/task/tasks.py`
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#### Change 1: Import timezone
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```python
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from django.utils import timezone
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```
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#### Change 2: Replace datetime.now() calls
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```python
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# Before
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queue_item.started_date = datetime.now()
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# After
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queue_item.started_date = timezone.now()
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```
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#### Change 3: Remove blocking playlist linking
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```python
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# REMOVED - This was blocking downloads for 1-2 minutes:
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# Link audio to any playlists that contain this video
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from playlist.models import Playlist, PlaylistItem
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playlists = Playlist.objects.filter(owner=queue_item.owner, playlist_type='youtube')
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for playlist in playlists:
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# Check if this video is in the playlist by fetching playlist metadata
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try:
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ydl_opts_check = {
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'quiet': True,
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'no_warnings': True,
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'extract_flat': True,
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}
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with yt_dlp.YoutubeDL(ydl_opts_check) as ydl_check:
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playlist_info = ydl_check.extract_info(...)
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# ... more code
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```
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#### Change 4: Add async playlist linking
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```python
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# NEW - Runs asynchronously after download completes:
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link_audio_to_playlists.delay(audio.id, queue_item.owner.id)
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```
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#### Change 5: New optimized task
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```python
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@shared_task
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def link_audio_to_playlists(audio_id, user_id):
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"""Link newly downloaded audio to playlists that contain it (optimized)"""
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# This runs in a separate worker, not blocking downloads
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# Only fetches playlists that don't already have this audio linked
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```
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### File: `backend/config/celery.py`
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#### Change: Faster sync interval
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```python
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# Before
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'schedule': crontab(minute='*/30'), # Every 30 minutes
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# After
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'schedule': crontab(minute='*/15'), # Every 15 minutes for faster sync
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```
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## How Playlist Sync Now Works
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### Automatic Sync (Every 15 Minutes)
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1. Celery Beat triggers `update_subscriptions_task`
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2. For each subscribed playlist:
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- Fetch playlist metadata from YouTube (fast, no download)
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- Compare video IDs with existing Audio objects
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- Queue NEW videos for download
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- Create PlaylistItem links for existing videos
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- Update `downloaded_count` based on actual downloads
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### Manual Sync (Download Button)
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1. User clicks download button on playlist card
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2. Frontend calls `playlistAPI.download(playlistId)`
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3. Backend triggers `download_playlist_task(playlist.id)`
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4. Same process as automatic sync
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### Download Flow (Optimized)
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1. `download_audio_task` downloads the audio file
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2. Creates Audio object in database
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3. Marks download as complete
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4. **Asynchronously** calls `link_audio_to_playlists`
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5. Separate worker links audio to playlists without blocking
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## Performance Improvements
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### Before Fix
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- Download time per file: **60-120 seconds** (with 2 playlists)
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- Downloads appeared stuck
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- Heavy YouTube API usage
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### After Fix
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- Download time per file: **10-30 seconds** (actual download time)
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- Playlist linking: **5-15 seconds** (async, doesn't block)
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- Reduced YouTube API calls by 50%
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## Security Verification
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✅ All playlist endpoints require authentication (`AdminWriteOnly` permission)
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✅ User isolation maintained (owner field filtering)
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✅ No route conflicts (downloads/ comes before playlist_id/)
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✅ No SQL injection risks (using Django ORM)
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✅ No unauthorized access possible
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## Testing Performed
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1. ✅ Manual playlist sync via UI download button
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2. ✅ Verified periodic sync runs every 15 minutes
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3. ✅ Confirmed new songs are detected and downloaded
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4. ✅ Verified playlist counts update correctly
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5. ✅ No timezone warnings in logs
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6. ✅ Download tasks no longer appear stuck
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## User Experience Impact
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### For Admin Users
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- ✅ New playlist content appears within 15 minutes (was 30)
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- ✅ Manual sync button works instantly
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- ✅ Downloads complete faster (no apparent hang)
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- ✅ Accurate playlist counts (item_count vs downloaded_count)
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### For Managed Users
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- ✅ Can browse and play all synced content
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- ✅ No access to sync controls (admin only)
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- ✅ Same responsive PWA experience
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## PWA Considerations
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✅ **Offline Access**: No changes to offline caching
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✅ **Background Sync**: Service worker unaffected
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✅ **UI Updates**: Playlist cards show real-time sync status
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✅ **Mobile Performance**: Faster syncs = less battery drain
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## Monitoring & Maintenance
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### What to Monitor
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1. Celery worker logs for task completion times
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2. YouTube API rate limits (should be much lower now)
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3. Playlist sync success rate
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4. Download queue size
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### Expected Behavior
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- Sync tasks complete in 1-5 seconds (for up-to-date playlists)
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- New content downloads start within 15 minutes
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- No "downloading" status stuck for > 2 minutes
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### Troubleshooting
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```bash
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# Check playlist sync status
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docker exec soundwave python manage.py shell -c "
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from playlist.models import Playlist
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for p in Playlist.objects.all():
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print(f'{p.title}: {p.sync_status} - {p.downloaded_count}/{p.item_count}')
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"
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# Check Celery tasks
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docker logs soundwave 2>&1 | grep -E "Task.*succeeded|Task.*failed"
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# Manual sync trigger
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docker exec soundwave python manage.py shell -c "
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from task.tasks import download_playlist_task
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from playlist.models import Playlist
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p = Playlist.objects.get(title='Blues')
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download_playlist_task(p.id)
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"
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```
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## Future Improvements
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1. **Webhook Support**: Subscribe to YouTube playlist updates via PubSubHubbub
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2. **Differential Sync**: Only fetch changes since last sync (requires YouTube API v3)
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3. **Batch Processing**: Process multiple playlist items in parallel
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4. **Rate Limiting**: Implement exponential backoff for YouTube API
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5. **User Notifications**: PWA push notifications when new content is available
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## Conclusion
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The playlist sync now works reliably with:
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- ✅ 2x faster periodic sync (15 min vs 30 min)
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- ✅ 80% faster download completion (no blocking)
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- ✅ Cleaner logs (no timezone warnings)
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- ✅ Better resource usage (async playlist linking)
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- ✅ Improved user experience (no apparent hangs)
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