Hojun-Cho 456ae3545b httpdl: unify completed counter and dedupe mirror loop; engine: harden untrack ...

From a Rob Pike pass over the tree:
- singleOnce adds deltas to d.completed like pump does, instead of
  storing absolute offsets, so the counter has one write discipline.
- one overMirrors helper replaces the three copy-pasted mirror-fallover
  loops in probeRetry, fetchSeg and single.
- failedDownload becomes a pointer, the only value-type Download impl, so
  Engine.untrack's == is always pointer identity and can't compare the
  fields of a value (keying on Stat().ID is out — a torrent's ID changes
  from source to infohash once metadata loads).

2026-06-20 21:12:07 +09:00

2.8 KiB

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