Function spawn

nodedb-cluster/src/swim/bootstrap.rs:88–96

Bring up a SWIM failure detector. `cfg` — validated [`SwimConfig`]. An invalid config returns [`SwimError::InvalidConfig`] before any task is spawned. `local_id` — this node's canonical id. `local_addr` — the socket address the transport is already bound to. The membership list stores it verbatim for peers to echo back in probe responses. `seeds` — initial peer addresses. Empty list is legal and

(
    cfg: SwimConfig,
    local_id: NodeId,
    local_addr: SocketAddr,
    seeds: Vec<SocketAddr>,
    transport: Arc<dyn Transport>,
)

/// * `transport` — any [`Transport`] impl (UDP in production, the
///   in-memory fabric in tests).
pub async fn spawn(
    cfg: SwimConfig,
    local_id: NodeId,
    local_addr: SocketAddr,
    seeds: Vec<SocketAddr>,
    transport: Arc<dyn Transport>,
) -> Result<SwimHandle, SwimError> {
    spawn_with_subscribers(cfg, local_id, local_addr, seeds, transport, Vec::new()).await
}

/// Same as [`spawn`] but installs the given [`MembershipSubscriber`]s
/// on the detector before its run loop starts, so every state