Method transition

nodedb-cluster/src/lifecycle_state.rs:165–177

Shared implementation: swap the state, log at INFO, push the status string to systemd.

(&self, new: ClusterLifecycleState, human: &str)

    /// Shared implementation: swap the state, log at INFO, push the
    /// status string to systemd.
    fn transition(&self, new: ClusterLifecycleState, human: &str) {
        let prev = {
            let mut guard = self.inner.write().unwrap_or_else(|p| p.into_inner());
            std::mem::replace(&mut *guard, new.clone())
        };
        info!(
            prev = prev.label(),
            new = new.label(),
            detail = human,
            "cluster lifecycle transition"
        );
        readiness::notify_status(human);
    }
}

impl Default for ClusterLifecycleTracker {