""" Author: Uyanide pywang0608@foxmail.com Date: 2026-03-25 11:09:53 Description: Core orchestrator — coordinates fetchers with cache-aware fallback """ import asyncio from typing import Optional from loguru import logger from .fetchers import FetcherMethodType, build_plan, create_fetchers from .fetchers.base import BaseFetcher from .cache import CacheEngine from .lrc import LRCData from .config import ( TTL_SYNCED, TTL_UNSYNCED, TTL_NOT_FOUND, TTL_NETWORK_ERROR, HIGH_CONFIDENCE, ) from .models import TrackMeta, LyricResult, CacheStatus from .enrichers import enrich_track # Maps CacheStatus to the default TTL used when storing results _STATUS_TTL: dict[CacheStatus, Optional[int]] = { CacheStatus.SUCCESS_SYNCED: TTL_SYNCED, CacheStatus.SUCCESS_UNSYNCED: TTL_UNSYNCED, CacheStatus.NOT_FOUND: TTL_NOT_FOUND, CacheStatus.NETWORK_ERROR: TTL_NETWORK_ERROR, } def _is_better(new: LyricResult, old: LyricResult) -> bool: """Compare two results: higher confidence wins; synced breaks ties.""" if new.confidence != old.confidence: return new.confidence > old.confidence # Equal confidence — prefer synced as tiebreaker return ( new.status == CacheStatus.SUCCESS_SYNCED and old.status != CacheStatus.SUCCESS_SYNCED ) def _normalize_result(result: LyricResult) -> LyricResult: """Normalize unsynced lyrics before returning.""" if result.status == CacheStatus.SUCCESS_UNSYNCED and result.lyrics: return LyricResult( status=result.status, lyrics=result.lyrics.normalize_unsynced(), source=result.source, ttl=result.ttl, confidence=result.confidence, ) return result class LrcManager: """Main entry point for fetching lyrics with caching.""" def __init__(self, db_path: str) -> None: self.cache = CacheEngine(db_path=db_path) self.fetchers = create_fetchers(self.cache) async def _run_group( self, group: list[BaseFetcher], track: TrackMeta, bypass_cache: bool, ) -> list[tuple[str, LyricResult]]: """Run one group: cache-check first, then parallel-fetch uncached. Returns (source, result) pairs.""" cached_results: list[tuple[str, LyricResult]] = [] need_fetch: list[BaseFetcher] = [] for fetcher in group: source = fetcher.source_name if not bypass_cache and not fetcher.self_cached: cached = self.cache.get(track, source) if cached: if cached.status in ( CacheStatus.NOT_FOUND, CacheStatus.NETWORK_ERROR, ): logger.debug( f"[{source}] cache hit: {cached.status.value}, skipping" ) continue is_trusted = cached.confidence >= HIGH_CONFIDENCE logger.info( f"[{source}] cache hit: {cached.status.value}" f" (confidence={cached.confidence:.0f})" ) cached_results.append((source, cached)) # Return immediately on trusted synced cache hit if cached.status == CacheStatus.SUCCESS_SYNCED and is_trusted: return cached_results continue elif not fetcher.self_cached: logger.debug(f"[{source}] cache bypassed") need_fetch.append(fetcher) if need_fetch: task_map: dict[asyncio.Task, BaseFetcher] = { asyncio.create_task(f.fetch(track, bypass_cache=bypass_cache)): f for f in need_fetch } pending = set(task_map) while pending: done, pending = await asyncio.wait( pending, return_when=asyncio.FIRST_COMPLETED ) found_trusted = False for task in done: fetcher = task_map[task] source = fetcher.source_name try: result = task.result() except Exception as e: logger.error(f"[{source}] fetch raised: {e}") continue if result is None: logger.debug(f"[{source}] returned None") continue if not fetcher.self_cached and not bypass_cache: ttl = result.ttl or _STATUS_TTL.get( result.status, TTL_NOT_FOUND ) self.cache.set(track, source, result, ttl_seconds=ttl) if result.status in ( CacheStatus.SUCCESS_SYNCED, CacheStatus.SUCCESS_UNSYNCED, ): logger.info( f"[{source}] got {result.status.value} lyrics" f" (confidence={result.confidence:.0f})" ) cached_results.append((source, result)) if ( result.status == CacheStatus.SUCCESS_SYNCED and result.confidence >= HIGH_CONFIDENCE ): found_trusted = True if found_trusted: for t in pending: t.cancel() await asyncio.gather(*pending, return_exceptions=True) break return cached_results async def _fetch_for_track( self, track: TrackMeta, force_method: Optional[FetcherMethodType], bypass_cache: bool, ) -> Optional[LyricResult]: track = await enrich_track(track) logger.info(f"Fetching lyrics for: {track.display_name()}") plan = build_plan(self.fetchers, track, force_method) if not plan: return None best_result: Optional[LyricResult] = None for group in plan: group_results = await self._run_group(group, track, bypass_cache) for source, result in group_results: if result.status not in ( CacheStatus.SUCCESS_SYNCED, CacheStatus.SUCCESS_UNSYNCED, ): continue is_trusted = result.confidence >= HIGH_CONFIDENCE # Trusted synced → return immediately if result.status == CacheStatus.SUCCESS_SYNCED and is_trusted: logger.info( f"Returning {result.status.value} lyrics from {source}" f" (confidence={result.confidence:.0f})" ) return _normalize_result(result) if best_result is None or _is_better(result, best_result): best_result = result if best_result: logger.info( f"Returning {best_result.status.value} lyrics from {best_result.source}" ) return _normalize_result(best_result) logger.info(f"No lyrics found for {track.display_name()}") return None def fetch_for_track( self, track: TrackMeta, force_method: Optional[FetcherMethodType] = None, bypass_cache: bool = False, ) -> Optional[LyricResult]: """Fetch lyrics for *track* using the group-based parallel pipeline.""" return asyncio.run(self._fetch_for_track(track, force_method, bypass_cache)) def manual_insert( self, track: TrackMeta, lyrics: str, ) -> None: """Manually insert lyrics into the cache for a track.""" track = asyncio.run(enrich_track(track)) logger.info(f"Manually inserting lyrics for: {track.display_name()}") lrc = LRCData(lyrics) result = LyricResult( status=lrc.detect_sync_status(), lyrics=lrc, source="manual", ttl=None, ) self.cache.set(track, "manual", result, ttl_seconds=None) logger.info("Lyrics inserted into cache.")