Manual /compress on a compute-host (turn_isolation) session blocked its RPC
waiter for a hard-coded 120s, answered error 5019, and then DROPPED the
host's late `control.ack`: HostSupervisor.control() popped the pending
queue in `finally`, so `_handle_host_frame` had nothing to deliver to. The
host kept compressing, succeeded minutes later, rotated the session — and
the gateway session never mirrored the new session_key/history_version and
the desktop never refreshed its transcript.
- host_supervisor: `control(..., on_late_ack=)` leaves a one-shot handler
registered when the waiter times out; control.ack/control.error/error
frames for that request_id fire it (bounded: 30min TTL, cap 64). A host
crash fails outstanding handlers with a synthetic control.error.
- server: `_compute_host_compress_wait_seconds()` derives the wait from
`compression.context_total_ceiling_seconds` (+30s slack, floor 120s,
cap 630s) instead of the literal 120. `_adopt_late_compute_host_compress_ack`
applies the metadata mirror and emits the same `session.info` a normal
compress does plus the existing `status.update kind=compacted` edge; a
late error goes out through the existing `error` event.
- session.compress / slash.compress (methods_tools + _mirror_slash_side_effects):
on waiter timeout answer `status: pending` (not 5019) and register the
late-ack handler.
- desktop: SESSION_COMPRESS_TIMEOUT_MS 120s -> 660s (above the gateway cap);
`status: 'pending'` renders as an info notice, not `error:`; the
`compacted` status edge rehydrates an idle active session's transcript
(mid-turn compaction still defers to the turn settle path).
Minimal extraction of the design in #99630 by @vsd2807 (design trace by
@andrexibiza and @JoaoMarcos44 in the #97948 thread); no new DB tables,
modules, or polling protocol.
Refs #97948
Co-authored-by: VVV <vaibhavdahiya28@gmail.com>
Teknium
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