118 lines
4.1 KiB
Python
118 lines
4.1 KiB
Python
"""Periodic maintenance: recover stuck import tasks, garbage-collect old finished tasks."""
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import logging
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from datetime import UTC, datetime, timedelta
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from PIL import Image
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from sqlalchemy import create_engine, delete, select, update
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from sqlalchemy.orm import sessionmaker
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from ..celery_app import celery
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from ..config import get_config
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from ..models import ImageRecord, ImportTask
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from ..utils.phash import compute_phash
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log = logging.getLogger(__name__)
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STUCK_THRESHOLD_MINUTES = 30
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OLD_TASK_DAYS = 7
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PHASH_PAGE = 500
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def _sync_session_factory():
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cfg = get_config()
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engine = create_engine(cfg.database_url_sync, future=True, pool_pre_ping=True)
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return sessionmaker(engine, expire_on_commit=False)
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@celery.task(name="backend.app.tasks.maintenance.recover_interrupted_tasks")
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def recover_interrupted_tasks() -> int:
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"""Find ImportTask rows stuck in 'processing' for >30 min and re-queue them.
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Why 30 min: large videos can legitimately take many minutes to import;
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30 is a safe gate that catches actual crashes (which leave the row stuck
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forever) without resetting slow-but-still-running jobs.
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"""
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SessionLocal = _sync_session_factory()
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cutoff = datetime.now(UTC) - timedelta(minutes=STUCK_THRESHOLD_MINUTES)
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with SessionLocal() as session:
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stuck_ids = session.execute(
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select(ImportTask.id)
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.where(ImportTask.status == "processing")
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.where(ImportTask.started_at < cutoff)
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).scalars().all()
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if not stuck_ids:
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return 0
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session.execute(
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update(ImportTask)
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.where(ImportTask.id.in_(stuck_ids))
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.values(status="queued", started_at=None, error="recovered from stuck state")
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)
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session.commit()
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from .import_file import import_media_file
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for tid in stuck_ids:
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import_media_file.delay(tid)
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return len(stuck_ids)
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@celery.task(name="backend.app.tasks.maintenance.cleanup_old_tasks")
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def cleanup_old_tasks() -> int:
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"""Delete completed/skipped/failed ImportTask rows older than 7 days.
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Why 7 days: long enough to debug an issue an operator only notices days
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later; short enough that the task table stays a useful operational view
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rather than an archive. Matches IR's default.
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"""
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SessionLocal = _sync_session_factory()
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cutoff = datetime.now(UTC) - timedelta(days=OLD_TASK_DAYS)
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with SessionLocal() as session:
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result = session.execute(
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delete(ImportTask)
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.where(ImportTask.status.in_(["complete", "skipped", "failed"]))
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.where(ImportTask.finished_at < cutoff)
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)
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session.commit()
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return result.rowcount or 0
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@celery.task(name="backend.app.tasks.maintenance.backfill_phash")
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def backfill_phash() -> int:
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"""Recompute phash for stored images that have none (imported before
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FC-2d-i+ii). Keyset-paginated by id (restart-safe), NULL-only fill,
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idempotent. Videos legitimately keep phash NULL. A missing/unreadable
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file is logged and left NULL — never fails the task."""
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SessionLocal = _sync_session_factory()
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updated = 0
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last_id = 0
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with SessionLocal() as session:
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while True:
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rows = session.execute(
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select(ImageRecord)
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.where(ImageRecord.id > last_id)
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.where(ImageRecord.phash.is_(None))
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.where(ImageRecord.mime.like("image/%"))
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.order_by(ImageRecord.id.asc())
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.limit(PHASH_PAGE)
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).scalars().all()
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if not rows:
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break
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for rec in rows:
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try:
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with Image.open(rec.path) as im:
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ph = compute_phash(im)
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except Exception as exc:
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log.warning(
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"backfill_phash: unreadable %s: %s", rec.path, exc
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)
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ph = None
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if ph is not None and rec.phash is None:
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rec.phash = ph
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updated += 1
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session.commit()
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last_id = rows[-1].id
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return updated
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