use std::sync::atomic::AtomicUsize;
static PARA_ID: AtomicUsize = AtomicUsize::new(1);
pub fn generate_para_id() -> String {
use std::sync::atomic::Ordering;
let id = PARA_ID.load(Ordering::Relaxed);
PARA_ID.store(id.wrapping_add(1), Ordering::Relaxed);
format!("{:08x}", id)
}