Harvey
102 lines
3.8 KiB
Python
102 lines
3.8 KiB
Python
from __future__ import annotations
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import asyncio
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import logging
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from typing import TYPE_CHECKING
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from infrastructure.queue.priority_queue import RequestPriority
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if TYPE_CHECKING:
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from repositories.coverart_repository import CoverArtRepository
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logger = logging.getLogger(__name__)
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_PREWARM_INTER_ITEM_DELAY = 2.0
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_MAX_CONCURRENT_PREWARMS = 3
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_MAX_MBIDS_PER_RUN = 100
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class GenreCoverPrewarmService:
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def __init__(self, cover_repo: CoverArtRepository) -> None:
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self._cover_repo = cover_repo
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self._active_genres: dict[str, asyncio.Task[None]] = {}
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self._global_semaphore = asyncio.Semaphore(_MAX_CONCURRENT_PREWARMS)
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def schedule_prewarm(
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self,
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genre_name: str,
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artist_mbids: list[str],
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album_mbids: list[str],
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) -> None:
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existing = self._active_genres.get(genre_name)
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if existing is not None and not existing.done():
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logger.debug("Pre-warm already in progress for genre '%s', skipping", genre_name)
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return
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task = asyncio.create_task(
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self._prewarm(genre_name, artist_mbids, album_mbids),
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name=f"genre-prewarm-{genre_name}",
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)
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self._active_genres[genre_name] = task
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from core.task_registry import TaskRegistry
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try:
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TaskRegistry.get_instance().register(f"genre-prewarm-{genre_name}", task)
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except RuntimeError:
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pass
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task.add_done_callback(
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lambda _t, _g=genre_name, _ref=task: (
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self._active_genres.pop(_g, None)
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if self._active_genres.get(_g) is _ref
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else None
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)
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)
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async def shutdown(self) -> None:
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tasks = list(self._active_genres.values())
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if not tasks:
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return
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for t in tasks:
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t.cancel()
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await asyncio.gather(*tasks, return_exceptions=True)
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self._active_genres.clear()
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logger.info("GenreCoverPrewarmService shutdown complete (%d tasks cancelled)", len(tasks))
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async def _prewarm(
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self,
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genre_name: str,
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artist_mbids: list[str],
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album_mbids: list[str],
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) -> None:
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async with self._global_semaphore:
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all_artist = artist_mbids[:_MAX_MBIDS_PER_RUN]
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remaining = _MAX_MBIDS_PER_RUN - len(all_artist)
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all_album = album_mbids[:remaining] if remaining > 0 else []
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total = len(all_artist) + len(all_album)
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warmed = 0
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try:
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for i, mbid in enumerate(all_artist):
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try:
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await self._cover_repo.get_artist_image(
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mbid, size=250, priority=RequestPriority.BACKGROUND_SYNC
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)
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warmed += 1
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except Exception as exc: # noqa: BLE001
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logger.debug("Pre-warm artist image failed for %s: %s", mbid[:8], exc)
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if i < len(all_artist) - 1 or all_album:
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await asyncio.sleep(_PREWARM_INTER_ITEM_DELAY)
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for i, mbid in enumerate(all_album):
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try:
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await self._cover_repo.get_release_group_cover(
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mbid, size="250", priority=RequestPriority.BACKGROUND_SYNC
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)
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warmed += 1
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except Exception as exc: # noqa: BLE001
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logger.debug("Pre-warm album cover failed for %s: %s", mbid[:8], exc)
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if i < len(all_album) - 1:
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await asyncio.sleep(_PREWARM_INTER_ITEM_DELAY)
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logger.info("Pre-warmed %d/%d genre covers for '%s'", warmed, total, genre_name)
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except Exception as exc: # noqa: BLE001
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logger.error("Genre cover pre-warm failed for '%s': %s", genre_name, exc)
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