init NotificationSys

ecstore/src/utils/net.rs

@@ -2,8 +2,9 @@ use crate::error::{Error, Result};
 use lazy_static::lazy_static;
 use std::{
     collections::HashSet,
-    net::{IpAddr, SocketAddr, ToSocketAddrs},
+    net::{IpAddr, SocketAddr, TcpListener, ToSocketAddrs},
 };
+
 use url::Host;
 
 lazy_static! {
@@ -92,6 +93,10 @@ pub fn get_host_ip(host: Host<&str>) -> Result<HashSet<IpAddr>> {
     }
 }
 
+pub fn get_available_port() -> u16 {
+    TcpListener::bind("0.0.0.0:0").unwrap().local_addr().unwrap().port()
+}
+
 /// returns IPs of local interface
 pub(crate) fn must_get_local_ips() -> Result<Vec<IpAddr>> {
     match netif::up() {