Optimize get ips

src/utils.rs

@@ -1,18 +1,18 @@
-use std::{io, net::IpAddr, vec};
+use std::{io, net::IpAddr};
 
 fn get_ips() -> Vec<IpAddr> {
-    let mut ips = vec![];
-    let ifs = pnet_datalink::interfaces();
-    for i in ifs {
-        if i.is_up() && i.is_multicast() {
-            for ip in i.ips {
-                if ip.is_ipv4() {
-                    ips.push(ip.ip())
-                }
-            }
-        }
-    }
-    ips
+    pnet_datalink::interfaces()
+        .iter()
+        .filter(|i| i.is_up() && i.is_multicast())
+        .map(|i| -> Vec<IpAddr> {
+            i.ips
+                .iter()
+                .filter(|ip| ip.is_ipv4())
+                .map(|ip| ip.ip())
+                .collect()
+        })
+        .flatten()
+        .collect()
 }
 
 pub fn select_ip() -> Option<String> {