Root cause of the WS->HTTP->WS flapping: the v1.1.15 input-delivery merge left a
call to the now-undefined _flushHttpFallbackQueuesViaWs() in ws.onopen, so every
(re)connect threw a TypeError BEFORE _onWsReady() ran -- durable input was never
re-flushed over the fresh socket, the 2s redeliver sweep then saw stale unacked
frames and force-closed the socket, reconnect, throw again: a self-sustaining
flap loop. Remove the dead call (_onWsReady, 10 lines below, is its replacement).
Resilience + observability:
- Pure CodemanWsReconnect.plan(code, attempt) (constants.js, TDD, 6 tests):
<4004 -> fast reconnect (immediate jittered first retry, faster backoff);
4008/unknown->=4004 -> bounded retry-fallback (HTTP no longer sticks until a
tab switch); 4004/4009 -> give up (session gone). Wired into onclose.
- Redeliver sweep force-closes only a SILENT socket (no recent recv), not one
actively delivering output/ACKs -- stops self-inflicted flaps while typing.
- Client logs WS close code/reason to crash-diag; server logs [ws]
open/close/terminate/4008 (console -> journald; Fastify runs logger:false).
Verified: 6/6 unit, tsc 0, frontend-syntax + prettier clean, build; beta WS
reaches connected with zero console errors (onopen TypeError gone),
_wsLastRecvAt tracked, server [ws] lines emit.
Aamer Akhter
68fd6e8962