Add a feature based dummy implementation

engine/src/control_pane/grpc/mod.rs

@@ -7,9 +7,7 @@ use tonic::{Response, transport::Server};
 use tonic_reflection::server;
 
 
-use crate::control_pane::ControlPane;
-#[cfg(feature = "jack") ]
-use crate::audio_engine::jack_ab::JackAudioBackend;
+use crate::{audio_engine::jack_ab::JackAudioBackend, control_pane::ControlPane};
 
 pub(crate) struct Grpc {
     pub(crate) port: i32,
@@ -65,11 +63,11 @@ impl AudioBackend for TermixAudioBackend {
     ) -> Result<Response<BackendList>, tonic::Status> {
         info!("discovering available backends");
         let mut response = BackendList::default();
-        if cfg!(feature = "jack") {
-            let jack = JackAudioBackend{ name: "jack".to_string(), running: todo!() };
-            response.backends.push(Backend {
-                name: "jack".to_string(),
-            });
+        let jack = JackAudioBackend::new();
+        if jack.feature_jack {
+          response.backends.push(Backend {
+            name: "jack".to_string(),
+          });
         }
         Ok(Response::new(response))
     }