Nomos chat fixes (#555)

* Make chat messages unique

Since DA will rightfully ignore duplicated messages, we need to add a nonce to make sure
every message is unique, so that a user can send the same message twice.
This nonce is randomly generated for simplicity.

* Clear in_flight status upon error on chat app

nomos-cli/Cargo.toml

@@ -36,3 +36,4 @@ crossterm = "0.27"
 ratatui = "0.24"
 tui-input = "0.8"
 ansi-to-tui = "3"
+rand = "0.8"

nomos-cli/src/cmds/chat/mod.rs

@@ -160,9 +160,8 @@ fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut app: App) {
         terminal.draw(|f| ui::ui(f, &app)).unwrap();
 
         if let Ok(update) = app.status_updates.try_recv() {
-            if let Status::Done = update {
+            if let Status::Done | Status::Err(_) = update {
                 app.message_in_flight = false;
-                app.message_status = None;
             }
             app.message_status = Some(update);
             app.last_updated = Instant::now();
@@ -191,6 +190,7 @@ fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut app: App) {
                                     wire::serialize(&ChatMessage {
                                         author: app.username.clone().unwrap(),
                                         message: app.input.value().into(),
+                                        _nonce: rand::random(),
                                     })
                                     .unwrap()
                                     .into(),
@@ -223,6 +223,9 @@ fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut app: App) {
 struct ChatMessage {
     author: String,
     message: String,
+    // Since DA will rightfully ignore duplicated messages, we need to add a nonce to make sure
+    // every message is unique. This is randomly generated for simplicity.
+    _nonce: u64,
 }
 
 #[tokio::main]

nomos-cli/src/cmds/chat/ui.rs

@@ -124,7 +124,12 @@ fn render_messages(f: &mut Frame, app: &App, rect: Rect) {
     let messages: Vec<ListItem> = app
         .messages
         .iter()
-        .map(|ChatMessage { author, message }| {
+        .map(
+            |ChatMessage {
+                 author,
+                 message,
+                 _nonce,
+             }| {
                 let content = if author == app.username.as_ref().unwrap() {
                     static MARGIN: usize = 2;
                     // pad to make it appear aligned on the right
@@ -142,7 +147,8 @@ fn render_messages(f: &mut Frame, app: &App, rect: Rect) {
                     .alignment(Alignment::Left)
                 };
                 ListItem::new(content)
-        })
+            },
+        )
         .collect();
     let messages =
         List::new(messages).block(Block::default().borders(Borders::ALL).title("Messages"));