User reported usenet album downloads getting stuck on "downloading
release" while SABnzbd reported the job as complete. Container restart
did not help; reproducible on every usenet album download.
Three independent issues all causing the same symptom — the download
modal freezes mid-flow with no error surfaced to the user:
1. SAB queue → history transition window
SAB removes a slot from its queue BEFORE adding it to the history,
and on a busy server (par2 verify, unrar, multi-file move) that
window can span several poll iterations. The poll treated a single
None status as terminal failure ("disappeared from client") and
gave up. Now the poll tolerates up to ~10s of consecutive misses
(5 polls at the default 2s interval) before declaring the job gone.
2. SAB queue states like `Pp` were unmapped
`_SAB_QUEUE_STATE_MAP` didn't cover SAB's `Pp` (post-processing
summary), `Unpacking`, `Trying`, `Deleted`, or the `Prop_paused`
/ `Prop_failed` variants. Unmapped states fell through to the
default-'error' fallback, and the poll loop only treated explicit
'failed' / 'completed' as terminal — 'error' was neither, so the
loop spun until the 6-hour timeout. Map now covers every Status
value from SAB's `sabnzbd/api.py`, and the poll treats the default-
'error' fallback as a transient miss (warn-logged, retry within
the same tolerance window) so a brand-new unmapped state can't
infinite-loop the way `Pp` did here.
3. No terminal failure emit
The poll only logged on failure / timeout / disappeared — never
called the progress callback with 'failed', so the download modal
stayed at the last 'downloading' emit forever. Plumb a 'failed'
emit through every failure exit path so the UI flips out of the
downloading state when the poll gives up.
Plus:
4. SAB direct nzo_ids lookup instead of paging all-history
`_get_status_sync` was fetching the latest 50 history entries on
every poll and iterating to find the target nzo_id. On busy
servers (many recent downloads), the target job could roll past
the 50-entry window and look like a "disappeared" job. Replaced
with a targeted `mode=queue&nzo_ids=<id>` → `mode=history&nzo_ids=<id>`
chain. Falls back to the bulk path for SAB versions that pre-date
the nzo_ids filter — the transient-miss tolerance covers any
short-lived gap there too.
Implementation:
Lifted the album-bundle poll loop out of `usenet.py` and `torrent.py`
into `core/download_plugins/album_bundle.py:poll_album_download` —
near-duplicate implementations are now a single function with deps
injected so it's testable in isolation (kettui's extract-don't-AST-parse
standard; can't unit-test a `time.sleep` loop inside a plugin method).
The lifted helper takes:
- `get_status` callable bound to job_id, so the same loop works for
usenet UsenetStatus and torrent TorrentStatus shapes
- `complete_states` set so torrent's `{'seeding', 'completed'}` and
usenet's `{'completed'}` both Just Work
- `failed_states` set so torrent's `{'error'}` is terminal while
usenet's default-'error' fallback is transient
- `transient_miss_threshold` (default 5 ≈ 10s at 2s poll)
- `sleep` / `monotonic` injectables for deterministic tests
Per-track flows in both plugins gained the same transient-miss
tolerance inline — they don't use the emit pattern (update an
`active_downloads[id]` row dict via lock instead), so reusing the
helper would have required threading a no-op emit through. Inline
fix is small enough.
Tests:
- 11 new tests in `tests/test_album_bundle.py:poll_album_download`
cover the happy path, transient-miss tolerance with recovery,
hard-failure threshold, explicit-failed surface, timeout-emit,
default-'error' transient treatment, shutdown clean exit,
torrent's `seeding`-counts-as-complete, save_path captured across
iterations, and adapter-exception treated as transient miss.
- 521 download-suite tests pass (33 in test_album_bundle, others
pin existing torrent + usenet contracts).
- Ruff clean.
Closes#706.
f13d339584