add tracing; one time lang call

src/main.rs

@@ -11,6 +11,7 @@ use std::{
 };
 use tower_http::services::ServeDir;
 use tower_sessions::{MemoryStore, SessionManagerLayer};
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
 use uuid::Uuid;
 
 #[macro_use]
@@ -70,6 +71,7 @@ impl From<String> for Language {
     }
 }
 
+#[derive(Debug)]
 struct Req {
     client: Client,
     lang: Language,
@@ -192,6 +194,11 @@ impl Backend {
 
 #[tokio::main]
 async fn main() {
+    tracing_subscriber::registry()
+        .with(tracing_subscriber::fmt::layer())
+        .with(EnvFilter::from_default_env())
+        .init();
+
     let session_store = MemoryStore::default();
     let session_layer = SessionManagerLayer::new(session_store).with_secure(false);