Send message through WebSocket fro new conversation messages

src/controllers/user_ws_controller.rs

@@ -483,6 +483,31 @@ pub fn send_message_to_users(msg: &UserWsMessage, users: &Vec<UserID>) -> Res {
     Ok(())
 }
 
+/// Send a message to specific users
+pub fn send_message_to_specific_connections<F, M, A>(filter: F, msg_generator: M, after_send: Option<A>) -> Res
+    where F: Fn(&WsConnection) -> bool,
+          M: Fn(&WsConnection) -> Res<UserWsMessage>,
+          A: Fn(&WsConnection) -> Res
+{
+    let connections = get_ws_connections_list()
+        .lock()
+        .unwrap()
+        .iter()
+        .filter(|f| filter(f))
+        .map(|f| f.clone())
+        .collect::<Vec<WsConnection>>();
+
+    for con in connections {
+        send_message(con.session.clone(), &msg_generator(&con)?)?;
+
+        if let Some(cb) = &after_send {
+            cb(&con)?;
+        }
+    }
+
+    Ok(())
+}
+
 /// Check out whether user is connected or not
 pub fn is_user_connected(user_id: &UserID) -> bool {
     get_ws_connections_list().lock().unwrap().iter().any(|c| &c.user_id == user_id)