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punktfunk/crates/punktfunk-host
enricobuehler 95a820b68a
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feat(host/m3): mid-stream session-switch watcher (Feature B, opt-in)
Feature B: while streaming, follow a Gaming<->Desktop switch on the box without
a reconnect. A ~1s watcher thread (session_watcher_loop) self-baselines on the
live ActiveKind and, when it changes and stays changed for a 3s debounce (the
old/new compositors coexist briefly during a switch), sends a SessionSwitch to
the encode loop. The loop's new rebuild slot — taking precedence over a queued
mode change — retargets the process env (apply_session_env/apply_input_env) and
rebuilds the WHOLE backend in place at the SAME client mode (vdisplay::open +
build_pipeline_with_retry), reusing the proven mode-switch rebuild path: the
Session + send thread (QUIC control + UDP data plane + side planes) stay up, the
client sees a brief freeze then an IDR. Old pipeline kept on a rebuild failure
(transient vs permanent classified via is_permanent_build_error). Input
re-routes via the host-lifetime injector's lazy reopen against the new
PUNKTFUNK_INPUT_BACKEND.

Opt-in via PUNKTFUNK_SESSION_WATCH (off by default; never under an explicit
PUNKTFUNK_COMPOSITOR pin), so it lands inert and is promoted to default only
after live validation on a real Bazzite Gaming<->KDE flip. The watcher snapshots
the SessionEnv so only the encode thread writes process env.

Compiles, clippy/fmt clean, 78 host tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-14 22:42:13 +00:00
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