Fault-tolerant delivery system

src/main.rs

@@ -1,5 +1,6 @@
 use zero2prod::{
-    configuration::get_configuration, startup::Application, telemetry::init_subscriber,
+    configuration::get_configuration, issue_delivery_worker::run_worker_until_stopped,
+    startup::Application, telemetry::init_subscriber,
 };
 
 #[tokio::main]
@@ -7,7 +8,15 @@ async fn main() -> Result<(), std::io::Error> {
     init_subscriber(std::io::stdout);
 
     let configuration = get_configuration().expect("Failed to read configuration");
-    let application = Application::build(configuration).await?;
-    application.run_until_stopped().await?;
+    let application = Application::build(configuration.clone()).await?;
+
+    let application_task = tokio::spawn(application.run_until_stopped());
+    let worker_task = tokio::spawn(run_worker_until_stopped(configuration));
+
+    tokio::select! {
+        _ = application_task => {},
+        _ = worker_task => {},
+    };
+
     Ok(())
 }