Add tokio watch channel to update mpris player state

src/http_server.rs

@@ -5,7 +5,7 @@ use axum::{
     routing::get,
     Router,
 };
-use tokio::sync::broadcast::Sender;
+use tokio::sync::watch::Sender;
 
 use crate::database::Database;
 
@@ -24,7 +24,7 @@ pub async fn http_serve(database: &Database, mpris_producer: Sender<(String, Str
 
     let app = Router::new()
         .route("/", get(root))
-        .route("/{length}", get(add_rating))
+        .route("/{user_id}/{rating}", get(add_rating))
         .with_state(shared_state);
 
     let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap();
@@ -39,10 +39,11 @@ async fn add_rating(
     Path((user_id, rating)): Path<(i64, i64)>,
     State(shared): State<SharedState>,
 ) -> Response {
-    // Get the current interpret and track from the broadcast channel
-    match shared.mpris_sender.subscribe().recv().await {
-        Ok((interpret, track)) => {
-            // write to db
+    let mut mpris_rx = shared.mpris_sender.subscribe();
+
+    // Get the current interpret and track from the watch channel
+    let (interpret, track) = (*mpris_rx.borrow_and_update()).clone();
+
     match shared
         .database
         .user_add_rating(user_id, &interpret, &track, rating)
@@ -54,10 +55,4 @@ async fn add_rating(
             (StatusCode::BAD_REQUEST, e.to_string()).into_response()
         }
     }
-        }
-        Err(e) => {
-            println!("mpris error: {e}");
-            (StatusCode::BAD_REQUEST, e.to_string()).into_response()
-        }
-    }
 }

src/main.rs

@@ -3,15 +3,12 @@ mod http_server;
 mod player;
 mod userinterface;
 
-use std::{env::args, sync::Arc};
+use std::{env::args, sync::Arc, thread::sleep, time::Duration};
 
-use tokio::sync::broadcast;
+use tokio::sync::watch;
 
 #[tokio::main]
 async fn main() {
-    // Initialize the mpris player
-    let player = player::MprisPlayer::new().expect("Could not create player");
-
     // Initialize the database
     let db = Arc::new(
         database::Database::new()
@@ -62,7 +59,8 @@ async fn main() {
     }
 
     // Instantiate the mpris channel
-    let (mpris_tx, _) = broadcast::channel(32);
+    // Channel size 1 makes sure we always have the correct song in the queue
+    let (mpris_tx, mut mpris_rx) = watch::channel((String::new(), String::new()));
 
     let mpris_tx_http = mpris_tx.clone();
     tokio::spawn(async move {
@@ -73,6 +71,8 @@ async fn main() {
                     println!("Error sending interpret and track: {e}");
                 }
             }
+            // Use the std sleep here to avoid an await which will requires player to be Send.
+            sleep(Duration::from_millis(10));
         }
     });
 
@@ -86,24 +86,13 @@ async fn main() {
         let (usernumber, userrating) = userinterface::get_user_rating(&db)
             .await
             .expect("Can not get user input");
+        let (interpret, track) = (*mpris_rx.borrow_and_update()).clone();
 
-        match player.get_interpret_and_track() {
-            Ok((interpret, song)) => {
         if let Err(e) = db
-                    .user_add_rating(usernumber, &interpret, &song, userrating)
+            .user_add_rating(usernumber, &interpret, &track, userrating)
             .await
         {
             eprintln!("{e}");
         }
     }
-            Err(e) => {
-                eprintln!("{e}");
-                continue;
-            }
-        }
-    }
-}
-
-fn mpris_player_producer() {
-    //
 }