peter
b1832afd18
Mechanical, whole-tree `ruff format` pass — no behaviour change. Recorded in .git-blame-ignore-revs (next commit) so git blame skips it.
53 lines
2.0 KiB
Python
53 lines
2.0 KiB
Python
"""Download/edit child process — runs ONE job's heavy work (yt-dlp download or ffmpeg edit) in its
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own process, launched and supervised by the worker (`app.worker._run_supervised`).
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Why a separate process: a worker THREAD can't be killed, a C-level spin (a catastrophic regex, a
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tight yt-dlp retry loop) can't even be cooperatively cancelled, and one such thread starves the
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others via the GIL. Running the work in a child means the supervisor can SIGTERM/SIGKILL it (and its
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process group, so ffmpeg grandchildren die too) on a stall / pause / wall-clock breach.
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Contract: the asset is already claimed ('downloading') by the parent. This process does the work and
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writes the terminal job/asset state itself (done / error, or a cooperative pause via the in-flight
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progress hook), then exits 0. An unexpected crash exits non-zero and the parent fails the job.
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"""
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import logging
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import sys
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from app.db import SessionLocal
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from app.models import DownloadJob
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log = logging.getLogger("siftlode.worker.runner")
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def main() -> None:
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logging.basicConfig(level=logging.INFO)
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if len(sys.argv) != 2:
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print("usage: python -m app.downloads.runner <job_id>", file=sys.stderr)
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raise SystemExit(2)
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job_id = int(sys.argv[1])
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with SessionLocal() as db:
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job = db.get(DownloadJob, job_id)
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if job is None:
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return
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asset_id = job.asset_id
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job_kind = job.job_kind
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spec = dict(job.profile_snapshot or {})
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source_kind, source_ref = job.source_kind, job.source_ref
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if asset_id is None:
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return
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# Imported here (not at module top) so the child pays the yt-dlp import cost only when it has
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# real work, and to keep the import graph obvious: runner is a thin entry over the pipeline.
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from app.downloads.pipeline import _download, _process_edit
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if job_kind == "edit":
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_process_edit(job_id, asset_id)
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else:
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_download(job_id, asset_id, source_kind, source_ref, spec)
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if __name__ == "__main__":
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main()
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