Move nonce generator to utils module

src/models/command.rs

@@ -1,6 +1,6 @@
 use serde::Serialize;
-use uuid::Uuid;
 use super::Payload;
+use utils::nonce;
 
 #[derive(Debug, Default, Serialize)]
 pub struct Command<T>
@@ -19,7 +19,7 @@ impl<T> Command<T>
     {
         Command {
             cmd: cmd.into(),
-            nonce: Uuid::new_v4().to_string(),
+            nonce: nonce(),
             args: args
         }
     }

src/models/handshake.rs

@@ -1,5 +1,5 @@
-use uuid::Uuid;
 use super::Payload;
+use utils::nonce;
 
 #[derive(Debug, Default, Serialize)]
 pub struct Handshake {
@@ -11,7 +11,7 @@ pub struct Handshake {
 impl Handshake {
     pub fn new(client_id: u64, version: u32) -> Self {
         Self {
-            nonce: Uuid::new_v4().to_string(),
+            nonce: nonce(),
             v: version,
             client_id: client_id.to_string()
         }

src/utils.rs

@@ -1,5 +1,10 @@
 use libc::getpid;
+use uuid::Uuid;
 
 pub fn pid() -> i32 {
     unsafe { getpid() as i32 }
 }
+
+pub fn nonce() -> String {
+    Uuid::new_v4().to_string()
+}