app_store: handling error responses

kinode/packages/app_store/api/app_store:sys-v1.wit

@@ -55,6 +55,7 @@ interface downloads {
         http-client-error,
         blob-not-found,
         vfs-error,
+        handling-error(string),
     }
 
     record download-complete-request {
@@ -192,7 +193,6 @@ interface main {
         local(local-response),
         chain-error(chain-error),
         download-error(download-error),
-        send-error(string),
         handling-error(string),
     }
 

kinode/packages/app_store/app_store/src/lib.rs

@@ -78,7 +78,12 @@ fn init(our: Address) {
             }
             Ok(message) => {
                 if let Err(e) = handle_message(&our, &mut state, &mut http_server, &message) {
-                    print_to_terminal(1, &format!("main: error handling message: {e:?}"));
+                    let error_message = format!("error handling message: {e:?}");
+                    print_to_terminal(1, &error_message);
+                    Response::new()
+                        .body(AppStoreResponse::HandlingError(error_message))
+                        .send()
+                        .unwrap();
                 }
             }
         }

kinode/packages/app_store/downloads/src/lib.rs

@@ -94,7 +94,14 @@ fn init(our: Address) {
                     &mut tmp,
                     &mut auto_updates,
                 ) {
-                    print_to_terminal(1, &format!("downloads: error handling message: {:?}", e));
+                    let error_message = format!("error handling message: {e:?}");
+                    print_to_terminal(1, &error_message);
+                    Response::new()
+                        .body(DownloadResponses::Err(DownloadError::HandlingError(
+                            error_message,
+                        )))
+                        .send()
+                        .unwrap();
                 }
             }
         }