222 lines
8.3 KiB
Python
222 lines
8.3 KiB
Python
"""Periodic maintenance: recover stuck import tasks, garbage-collect old finished tasks."""
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import logging
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import subprocess
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from datetime import UTC, datetime, timedelta
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from pathlib import Path
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from PIL import Image
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from sqlalchemy import delete, select, update
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from ..celery_app import celery
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from ..models import DownloadEvent, ImageRecord, ImportSettings, ImportTask
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from ..utils.phash import compute_phash
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from ._sync_engine import sync_session_factory as _sync_session_factory
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log = logging.getLogger(__name__)
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STUCK_THRESHOLD_MINUTES = 5
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OLD_TASK_DAYS = 7
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PHASH_PAGE = 500
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VERIFY_PAGE = 200
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FFPROBE_TIMEOUT_SECONDS = 10
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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 >5 min and re-queue them.
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Why 5 min: import_media_file is sub-second for the vast majority of
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files; even a large-video transcode caps at the per-task soft_time_limit
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(5 min) defined on the task itself. Anything still 'processing' after
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that window is a confirmed crash (worker died, DB disconnect mid-flush,
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OOM) and must be recycled. Was 30 min historically; tightened
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2026-05-24 after operator hit a 2224-row zombie pile during the IR
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migration scan.
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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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def _verify_one(path: Path, expected_sha: str, mime: str, sha_fn) -> str:
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"""Compute the integrity verdict for one file. Status precedence:
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failed_verification (can't run) > corrupt (sha mismatch / decode
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fails) > ok (passes both). Never raises."""
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try:
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if not path.is_file():
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return "failed_verification"
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try:
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actual_sha = sha_fn(path)
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except (OSError, PermissionError):
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return "failed_verification"
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if actual_sha != expected_sha:
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return "corrupt"
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if mime and mime.startswith("image/"):
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try:
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with Image.open(path) as im:
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im.verify()
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except Exception:
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return "corrupt"
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return "ok"
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if mime and mime.startswith("video/"):
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try:
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proc = subprocess.run(
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["ffprobe", "-v", "error", "-i", str(path)],
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capture_output=True,
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timeout=FFPROBE_TIMEOUT_SECONDS,
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)
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except FileNotFoundError:
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# ffprobe binary missing — environment problem, not file.
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return "failed_verification"
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except subprocess.TimeoutExpired:
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return "corrupt"
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return "ok" if proc.returncode == 0 else "corrupt"
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# Unknown mime — sha matched already; trust that.
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return "ok"
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except Exception as exc:
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log.warning("verify_integrity unexpected error for %s: %s", path, exc)
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return "failed_verification"
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@celery.task(name="backend.app.tasks.maintenance.verify_integrity")
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def verify_integrity() -> int:
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"""Verify every ImageRecord file: sha256 recompute + decode/probe
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(PIL for images; ffprobe for videos). Writes integrity_status
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(always — the column reflects the most recent verdict).
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Keyset-paginated, fail-soft per row, idempotent. Returns the total
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count verified."""
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from ..services.importer import _sha256_of # reuse the importer's helper
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SessionLocal = _sync_session_factory()
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total = 0
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counts = {"ok": 0, "corrupt": 0, "failed_verification": 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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.order_by(ImageRecord.id.asc())
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.limit(VERIFY_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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rec.integrity_status = _verify_one(
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Path(rec.path), rec.sha256, rec.mime, _sha256_of
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)
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counts[rec.integrity_status] = (
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counts.get(rec.integrity_status, 0) + 1
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)
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total += 1
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session.commit()
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last_id = rows[-1].id
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log.info("verify_integrity verdicts: %s (total %d)", counts, total)
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return total
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@celery.task(name="backend.app.tasks.maintenance.cleanup_old_download_events")
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def cleanup_old_download_events() -> int:
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"""FC-3d: delete terminal DownloadEvent rows older than the configured
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retention window. Never touches pending/running rows.
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Why terminal-only: pending/running rows represent in-flight work whose
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owning task may still be alive; deleting them would orphan the task.
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Retention days comes from ImportSettings.download_event_retention_days
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so the operator can tune without a code change.
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"""
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SessionLocal = _sync_session_factory()
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with SessionLocal() as session:
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settings = session.execute(
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select(ImportSettings).where(ImportSettings.id == 1)
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).scalar_one()
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retention_days = settings.download_event_retention_days
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cutoff = datetime.now(UTC) - timedelta(days=retention_days)
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result = session.execute(
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delete(DownloadEvent)
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.where(DownloadEvent.status.in_(["ok", "error", "skipped"]))
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.where(DownloadEvent.started_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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