Struct H2DrainState 

pub struct H2DrainState {
    pub draining: bool,
    pub peer_last_stream_id: Option<u32>,
    pub started_at: Option<Instant>,
    pub graceful_shutdown_deadline: Option<Duration>,
}

Connection draining state for graceful shutdown.

Fields

draining: bool

True when we’ve sent GOAWAY and are draining.

peer_last_stream_id: Option<u32>

Last stream ID from peer’s GOAWAY (for retry decisions).

started_at: Option<Instant>

Wall-clock timestamp captured the first time this connection entered draining during soft-stop. Used together with Self::graceful_shutdown_deadline to decide when to force-close. Remains None until the proxy-initiated drain begins (peer-initiated drains via handle_goaway_frame don’t arm the forced-close timer — the caller in Mux::shutting_down is the only writer).

graceful_shutdown_deadline: Option<Duration>

Wall-clock budget granted to in-flight streams after the initial GOAWAY(NO_ERROR). None means “wait indefinitely” (knob value 0). Default when unset upstream: 5 s (see L7ListenerHandler).