Add struct for key data

zenith_utils/src/pq_proto.rs

@@ -52,6 +52,12 @@ pub enum StartupRequestCode {
     Normal,
 }
 
+#[derive(Debug)]
+pub struct CancelKeyData {
+    pub backend_pid: i32,
+    pub cancel_key: i32,
+}
+
 #[derive(Debug)]
 pub struct FeQueryMessage {
     pub body: Bytes,
@@ -336,7 +342,7 @@ pub enum BeMessage<'a> {
     AuthenticationOk,
     AuthenticationMD5Password(&'a [u8; 4]),
     AuthenticationCleartextPassword,
-    BackendKeyData { backend_pid: i32, cancel_key: i32 },
+    BackendKeyData(CancelKeyData),
     BindComplete,
     CommandComplete(&'a [u8]),
     CopyData(&'a [u8]),
@@ -533,14 +539,11 @@ impl<'a> BeMessage<'a> {
                 .unwrap(); // write into BytesMut can't fail
             }
 
-            BeMessage::BackendKeyData {
-                backend_pid,
-                cancel_key,
-            } => {
+            BeMessage::BackendKeyData(key_data) => {
                 buf.put_u8(b'K');
                 write_body(buf, |buf| {
-                    buf.put_i32(*backend_pid);
-                    buf.put_i32(*cancel_key);
+                    buf.put_i32(key_data.backend_pid);
+                    buf.put_i32(key_data.cancel_key);
                     Ok(())
                 })
                 .unwrap();