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refactor(server): extract the highway WebSocket into routers/ws_highway.py (R3) (#844)

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The single largest handler in server.py — the 902-line /ws/highway/{filename}
chart streamer — plus its 3 exclusive helpers (_pick_smart_arrangement,
_sanitize_authors, _sanitized_song_offset). server.py: 9,008 -> 8,003 (-1,005,
the biggest single R3 cut).

Clean move despite the size: the handler's only server-module deps are the 4
path constants + 3 exclusive helpers + app + log. Everything else it uses is
either NESTED inside the handler (_evict_audio_cache, _fill_scale_degree,
_manifest_entries, _tone_names, _xml_rank, _send_keepalives) or imported from
the shared lib modules (song/audio/sloppak/drums/notation/dlc_paths/metadata_db).

- Path constants read through the appstate seam: added static_dir /
  sloppak_cache_dir / audio_cache_dir slots (config_dir already there);
  server.py configures them. Bodies otherwise verbatim (@app.websocket ->
  @router.websocket, PATHS -> appstate.*, log -> module logger).
- sloppak_cache_dir IS setattr-patched, so the 3 test_highway_ws_* suites now
  also `setattr(appstate, "sloppak_cache_dir", ...)` next to their existing
  server patch. _sanitize_authors unit tests import it from routers.ws_highway
  (it moved). No other test churn.
- Removed 23 now-dead imports from server.py (song/audio/drums/notation/
  bisect/contextvars/structlog/WebSocket*/_arr_smart_sort_key) — diffed against
  the origin/main unused-import baseline so only NEWLY-dead ones went.

owns_tmp (assigned, never read) moved verbatim — it's pre-existing dead on
origin/main too; left as-is to keep the move faithful.

Verified: route table identical to origin/main (143, paths/methods/order);
handler body verbatim spot-checked; pyflakes clean (server has no new
undefined/dead); pytest 2400 passed; packaging guard 53; eslint 0. Boot smoke:
the highway WS streams the full chart (song_info/beats/sections/notes/chords/
notation/anchors/drum_tab -> ready) BYTE-for-byte the same message sequence as
origin/main across arrangements 0/1/2, zero tracebacks.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Byron Gamatos
2026-07-10 21:12:54 +02:00
committed by GitHub
co-authored by Claude Opus 4.8
parent 0dcc9136b6
commit 514461167e
8 changed files with 1087 additions and 1021 deletions
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docs/size-exemptions.md
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@@ -55,8 +55,8 @@ without a *signed* exemption" is unenforceable.
## Planned, NOT exempt (owned by split plans — listed so nothing falls between states)
core `static/app.js` (11,852) · `static/highway.js` (4,168, whole file) · `server.py`
(9,008 — was 14,037; ratcheted by the R3 `MetadataDB` + `AudioEffectsMappingDB`
extractions and four `routers/` modules) ·
(8,003 — was 14,037; ratcheted by the R3 `MetadataDB` + `AudioEffectsMappingDB`
extractions and five `routers/` modules) ·
`lib/metadata_db.py` (4,373 — new in R3; the `MetadataDB` class alone is 4,018 lines
and is a monolith in its own right, to be split per-table once the router train
lands) · `static/v3/songs.js` (4,134) · `static/capabilities/audio-session.js`