"""Background worker for Deezer playlist discovery. `run_deezer_discovery_worker(playlist_id, deps)` is the function the Deezer discovery start-endpoint submits to the deezer discovery executor to match each Deezer playlist track against Spotify (preferred) or iTunes (fallback): 1. Pause enrichment workers (release shared resources). 2. For each Deezer track: - Cancellation gate (state['cancelled']). - Discovery cache lookup; cache hit short-circuits the search. - SimpleNamespace duck-type → `_search_spotify_for_tidal_track` (shared search helper, returns tuple for Spotify or dict for iTunes). - On match: build `match_data` (Spotify path preserves track_number / disc_number from raw API data, image extracted from album images). - Save to discovery cache. - On miss: Wing It stub created from raw Deezer track data. 3. After all tracks: phase='discovered', activity feed entry. 4. Sync discovery results back to mirrored playlist via `_sync_discovery_results_to_mirrored`. 5. On error: state['phase']='error' + status with error string. 6. Finally: resume enrichment workers. Lifted verbatim from web_server.py. Wide dependency surface (Spotify and iTunes clients, multiple metadata helpers, state dict, mirrored sync, shared tidal search helper) all injected via `DeezerDiscoveryDeps`. """ from __future__ import annotations import logging import time import types from dataclasses import dataclass from typing import Any, Callable logger = logging.getLogger(__name__) @dataclass class DeezerDiscoveryDeps: """Bundle of cross-cutting deps the Deezer discovery worker needs.""" deezer_discovery_states: dict spotify_client: Any pause_enrichment_workers: Callable[[str], dict] resume_enrichment_workers: Callable[[dict, str], None] get_active_discovery_source: Callable[[], str] get_metadata_fallback_client: Callable[[], Any] get_discovery_cache_key: Callable get_database: Callable[[], Any] validate_discovery_cache_artist: Callable search_spotify_for_tidal_track: Callable build_discovery_wing_it_stub: Callable add_activity_item: Callable sync_discovery_results_to_mirrored: Callable def run_deezer_discovery_worker(playlist_id, deps: DeezerDiscoveryDeps): """Background worker for Deezer discovery process (Spotify preferred, iTunes fallback)""" _ew_state = {} try: _ew_state = deps.pause_enrichment_workers('Deezer discovery') state = deps.deezer_discovery_states[playlist_id] playlist = state['playlist'] # Determine which provider to use discovery_source = deps.get_active_discovery_source() use_spotify = (discovery_source == 'spotify') and deps.spotify_client and deps.spotify_client.is_spotify_authenticated() # Initialize fallback client if needed itunes_client_instance = None if not use_spotify: itunes_client_instance = deps.get_metadata_fallback_client() logger.info(f"Starting Deezer discovery for: {playlist['name']} (using {discovery_source.upper()})") # Store discovery source in state for frontend state['discovery_source'] = discovery_source successful_discoveries = 0 tracks = playlist['tracks'] for i, deezer_track in enumerate(tracks): if state.get('cancelled', False): break try: track_name = deezer_track['name'] track_artists = deezer_track['artists'] track_id = deezer_track['id'] track_album = deezer_track.get('album', '') track_duration_ms = deezer_track.get('duration_ms', 0) logger.info(f"[{i+1}/{len(tracks)}] Searching {discovery_source.upper()}: {track_name} by {', '.join(track_artists)}") # Check discovery cache first cache_key = deps.get_discovery_cache_key(track_name, track_artists[0] if track_artists else '') try: cache_db = deps.get_database() cached_match = cache_db.get_discovery_cache_match(cache_key[0], cache_key[1], discovery_source) if cached_match and deps.validate_discovery_cache_artist(track_artists[0] if track_artists else '', cached_match): logger.debug(f"CACHE HIT [{i+1}/{len(tracks)}]: {track_name} by {', '.join(track_artists)}") # Extract display-friendly artist string from cached match cached_artists = cached_match.get('artists', []) if cached_artists: cached_artist_str = ', '.join( a if isinstance(a, str) else a.get('name', '') for a in cached_artists ) else: cached_artist_str = '' cached_album = cached_match.get('album', '') if isinstance(cached_album, dict): cached_album = cached_album.get('name', '') result = { 'deezer_track': { 'id': track_id, 'name': track_name, 'artists': track_artists or [], 'album': track_album, 'duration_ms': track_duration_ms, }, 'spotify_data': cached_match, 'match_data': cached_match, 'status': 'Found', 'status_class': 'found', 'spotify_track': cached_match.get('name', ''), 'spotify_artist': cached_artist_str, 'spotify_album': cached_album, 'spotify_id': cached_match.get('id', ''), 'discovery_source': discovery_source, 'index': i } successful_discoveries += 1 state['spotify_matches'] = successful_discoveries state['discovery_results'].append(result) state['discovery_progress'] = int(((i + 1) / len(tracks)) * 100) continue except Exception as cache_err: logger.error(f"Cache lookup error: {cache_err}") # Create a SimpleNamespace duck-type object for _search_spotify_for_tidal_track track_ns = types.SimpleNamespace( id=track_id, name=track_name, artists=track_artists, album=track_album, duration_ms=track_duration_ms ) # Use the search function with appropriate provider track_result = deps.search_spotify_for_tidal_track( track_ns, use_spotify=use_spotify, itunes_client=itunes_client_instance ) # Create result entry result = { 'deezer_track': { 'id': track_id, 'name': track_name, 'artists': track_artists or [], 'album': track_album, 'duration_ms': track_duration_ms, }, 'spotify_data': None, 'match_data': None, 'status': 'Not Found', 'status_class': 'not-found', 'spotify_track': '', 'spotify_artist': '', 'spotify_album': '', 'discovery_source': discovery_source } match_confidence = 0.0 if use_spotify and isinstance(track_result, tuple): # Spotify: Function returns (Track, raw_data, confidence) track_obj, raw_track_data, match_confidence = track_result album_obj = raw_track_data.get('album', {}) if raw_track_data else {} # Ensure album has a name — fall back to track_obj.album if raw_data was missing if isinstance(album_obj, dict) and not album_obj.get('name') and track_obj.album: album_obj['name'] = track_obj.album elif not album_obj and track_obj.album: album_obj = {'name': track_obj.album} # Ensure release_date is present (raw Spotify data has it, but fallback may not) if isinstance(album_obj, dict) and not album_obj.get('release_date'): album_obj['release_date'] = getattr(track_obj, 'release_date', '') or '' # Extract image URL from album data or track object _album_images = album_obj.get('images', []) if isinstance(album_obj, dict) else [] _image_url = _album_images[0].get('url', '') if _album_images else (getattr(track_obj, 'image_url', '') or '') match_data = { 'id': track_obj.id, 'name': track_obj.name, 'artists': track_obj.artists, 'album': album_obj, 'duration_ms': track_obj.duration_ms, 'external_urls': track_obj.external_urls, 'image_url': _image_url, 'source': 'spotify' } # Preserve track_number/disc_number from raw Spotify API data if raw_track_data and raw_track_data.get('track_number'): match_data['track_number'] = raw_track_data['track_number'] if raw_track_data and raw_track_data.get('disc_number'): match_data['disc_number'] = raw_track_data['disc_number'] result['spotify_data'] = match_data result['match_data'] = match_data result['status'] = 'Found' result['status_class'] = 'found' result['spotify_track'] = track_obj.name result['spotify_artist'] = ', '.join(track_obj.artists) if isinstance(track_obj.artists, list) else str(track_obj.artists) result['spotify_album'] = album_obj.get('name', '') if isinstance(album_obj, dict) else str(album_obj) result['spotify_id'] = track_obj.id result['confidence'] = match_confidence successful_discoveries += 1 state['spotify_matches'] = successful_discoveries elif not use_spotify and track_result and isinstance(track_result, dict): # Fallback: Function returns a dict with track data (includes 'confidence' key) match_confidence = track_result.pop('confidence', 0.80) match_data = track_result match_data['source'] = discovery_source # Extract image URL from album images _fb_album = match_data.get('album', {}) _fb_images = _fb_album.get('images', []) if isinstance(_fb_album, dict) else [] if _fb_images and 'image_url' not in match_data: match_data['image_url'] = _fb_images[0].get('url', '') result['spotify_data'] = match_data result['match_data'] = match_data result['status'] = 'Found' result['status_class'] = 'found' result['spotify_track'] = match_data.get('name', '') itunes_artists = match_data.get('artists', []) result['spotify_artist'] = ', '.join(a if isinstance(a, str) else a.get('name', '') for a in itunes_artists) if itunes_artists else '' result['spotify_album'] = match_data.get('album', {}).get('name', '') if isinstance(match_data.get('album'), dict) else match_data.get('album', '') result['spotify_id'] = match_data.get('id', '') result['confidence'] = match_confidence successful_discoveries += 1 state['spotify_matches'] = successful_discoveries # Save to discovery cache if match found if result['status_class'] == 'found' and result.get('match_data'): try: cache_db = deps.get_database() cache_db.save_discovery_cache_match( cache_key[0], cache_key[1], discovery_source, match_confidence, result['match_data'], track_name, track_artists[0] if track_artists else '' ) logger.info(f"CACHE SAVED: {track_name} (confidence: {match_confidence:.3f})") except Exception as cache_err: logger.error(f"Cache save error: {cache_err}") # Auto Wing It fallback for unmatched tracks if result['status_class'] == 'not-found': deezer_t = result.get('deezer_track', {}) stub = deps.build_discovery_wing_it_stub( deezer_t.get('name', ''), ', '.join(deezer_t.get('artists', [])), deezer_t.get('duration_ms', 0) ) result['status'] = 'Wing It' result['status_class'] = 'wing-it' result['spotify_data'] = stub result['match_data'] = stub result['spotify_track'] = deezer_t.get('name', '') result['spotify_artist'] = ', '.join(deezer_t.get('artists', [])) result['wing_it_fallback'] = True result['confidence'] = 0 successful_discoveries += 1 state['spotify_matches'] = successful_discoveries state['wing_it_count'] = state.get('wing_it_count', 0) + 1 result['index'] = i state['discovery_results'].append(result) state['discovery_progress'] = int(((i + 1) / len(tracks)) * 100) # Add delay between requests time.sleep(0.1) except Exception as e: logger.error(f"Error processing track {i+1}: {e}") # Add error result result = { 'deezer_track': { 'name': deezer_track.get('name', 'Unknown'), 'artists': deezer_track.get('artists', []), }, 'spotify_data': None, 'match_data': None, 'status': 'Error', 'status_class': 'error', 'spotify_track': '', 'spotify_artist': '', 'spotify_album': '', 'error': str(e), 'discovery_source': discovery_source, 'index': i } state['discovery_results'].append(result) state['discovery_progress'] = int(((i + 1) / len(tracks)) * 100) # Mark as complete state['phase'] = 'discovered' state['status'] = 'discovered' state['discovery_progress'] = 100 # Add activity for discovery completion source_label = discovery_source.upper() deps.add_activity_item("", f"Deezer Discovery Complete ({source_label})", f"'{playlist['name']}' - {successful_discoveries}/{len(tracks)} tracks found", "Now") logger.info(f"Deezer discovery complete ({source_label}): {successful_discoveries}/{len(tracks)} tracks found") # Sync discovery results back to mirrored playlist deps.sync_discovery_results_to_mirrored('deezer', playlist_id, state.get('discovery_results', []), discovery_source, profile_id=state.get('_profile_id', 1)) except Exception as e: logger.error(f"Error in Deezer discovery worker: {e}") if playlist_id in deps.deezer_discovery_states: deps.deezer_discovery_states[playlist_id]['phase'] = 'error' deps.deezer_discovery_states[playlist_id]['status'] = f'error: {str(e)}' finally: deps.resume_enrichment_workers(_ew_state, 'Deezer discovery')