fix: wake up background polling loop immediately when a client connects

backend/src/main.rs

@@ -45,6 +45,7 @@ pub struct AppState {
     pub db: db::Db,
     #[cfg(feature = "push-notifications")]
     pub push_store: push::PushSubscriptionStore,
+    pub notify_poll: Arc<tokio::sync::Notify>,
 }
 
 async fn auth_middleware(
@@ -336,6 +337,8 @@ async fn main() {
     #[cfg(not(feature = "push-notifications"))]
     let push_store = ();
 
+    let notify_poll = Arc::new(tokio::sync::Notify::new());
+
     let app_state = AppState {
         tx: tx.clone(),
         event_bus: event_bus.clone(),
@@ -343,6 +346,7 @@ async fn main() {
         db: db.clone(),
         #[cfg(feature = "push-notifications")]
         push_store,
+        notify_poll: notify_poll.clone(),
     };
 
     // Spawn background task to poll rTorrent
@@ -351,6 +355,7 @@ async fn main() {
     let socket_path = args.socket.clone(); // Clone for background task
     #[cfg(feature = "push-notifications")]
     let push_store_clone = app_state.push_store.clone();
+    let notify_poll_clone = notify_poll.clone();
 
     tokio::spawn(async move {
         let client = xmlrpc::RtorrentClient::new(&socket_path);
@@ -359,6 +364,14 @@ async fn main() {
         let mut backoff_duration = Duration::from_secs(1);
 
         loop {
+            // Determine polling interval based on active clients
+            let active_clients = event_bus_tx.receiver_count();
+            let loop_interval = if active_clients > 0 {
+                Duration::from_secs(1)
+            } else {
+                Duration::from_secs(30)
+            };
+
             // 1. Fetch Torrents
             let torrents_result = sse::fetch_torrents(&client).await;
 
@@ -429,6 +442,14 @@ async fn main() {
                     }
 
                     previous_torrents = new_torrents;
+
+                    // Success case: wait for the determined interval OR a wakeup notification
+                    tokio::select! {
+                        _ = tokio::time::sleep(loop_interval) => {},
+                        _ = notify_poll_clone.notified() => {
+                            tracing::debug!("Background loop awakened by new client connection");
+                        }
+                    }
                 }
                 Err(e) => {
                     tracing::error!("Error fetching torrents in background: {}", e);
@@ -449,20 +470,15 @@ async fn main() {
                         "Backoff: Sleeping for {:?} due to rTorrent error.",
                         backoff_duration
                     );
+                    
+                    tokio::time::sleep(backoff_duration).await;
                 }
             }
 
             // Handle Stats
-            match stats_result {
+            if let Ok(stats) = stats_result {
-                Ok(stats) => {
+                let _ = event_bus_tx.send(AppEvent::Stats(stats));
-                    let _ = event_bus_tx.send(AppEvent::Stats(stats));
-                }
-                Err(e) => {
-                    tracing::warn!("Error fetching global stats: {}", e);
-                }
             }
-
-            tokio::time::sleep(backoff_duration).await;
         }
     });
 

backend/src/sse.rs

@@ -195,6 +195,9 @@ pub async fn fetch_global_stats(client: &RtorrentClient) -> Result<GlobalStats,
 pub async fn sse_handler(
     State(state): State<AppState>,
 ) -> Sse<impl Stream<Item = Result<Event, Infallible>>> {
+    // Notify background worker to wake up and poll immediately
+    state.notify_poll.notify_one();
+
     // Get initial value synchronously (from the watch channel's current state)
     let initial_rx = state.tx.subscribe();
     let initial_torrents = initial_rx.borrow().clone();

frontend/src/components/torrent/table.rs

@@ -254,7 +254,7 @@ pub fn TorrentTable() -> impl IntoView {
                                  <div class="flex items-center">"Status" {move || sort_arrow(SortColumn::Status)}</div>
                             </th>
                             <th class="w-24 cursor-pointer hover:bg-base-300 group select-none" on:click=move |_| handle_sort(SortColumn::DownSpeed)>
-                                 <div class="flex items-center">"Down Speed" {move || sort_arrow(SortColumn::DownSpeed)}</div>
+                                 <div class="flex items-center">"DL Speed" {move || sort_arrow(SortColumn::DownSpeed)}</div>
                             </th>
                             <th class="w-24 cursor-pointer hover:bg-base-300 group select-none" on:click=move |_| handle_sort(SortColumn::UpSpeed)>
                                  <div class="flex items-center">"Up Speed" {move || sort_arrow(SortColumn::UpSpeed)}</div>
@@ -345,7 +345,7 @@ pub fn TorrentTable() -> impl IntoView {
                                                   (SortColumn::Size, "Size"),
                                                   (SortColumn::Progress, "Progress"),
                                                   (SortColumn::Status, "Status"),
-                                                  (SortColumn::DownSpeed, "Down Speed"),
+                                                  (SortColumn::DownSpeed, "DL Speed"),
                                                   (SortColumn::UpSpeed, "Up Speed"),
                                                   (SortColumn::ETA, "ETA"),
                                                   (SortColumn::AddedDate, "Date"),