Fix directory metrics (payjoin#1173)

Author: spacebear21

payjoin-directory/src/lib.rs

@@ -159,6 +159,7 @@ impl<D: Db> Service<D> {
     where
         I: tokio::io::AsyncRead + tokio::io::AsyncWrite + Send + Unpin + 'static,
     {
+        self.metrics.record_connection();
         if let Err(err) =
             http1::Builder::new().serve_connection(TokioIo::new(stream), self).with_upgrades().await
         {

payjoin-directory/src/main.rs

@@ -32,9 +32,17 @@ async fn main() -> Result<(), BoxError> {
 
     let service = Service::new(db, ohttp.into(), metrics);
 
+    // Start metrics server in the background
     if let Some(addr) = config.metrics_listen_addr {
-        let metrics_listener = TcpListener::bind(addr).await?;
-        service.serve_metrics_tcp(metrics_listener).await?;
+        let metrics_listener = TcpListener::bind(addr.clone()).await?;
+        let service_clone = service.clone();
+
+        tokio::spawn(async move {
+            if let Err(e) = service_clone.serve_metrics_tcp(metrics_listener).await {
+                eprintln!("Metrics server error: {e}");
+            }
+            println!("Metrics server started on {}", addr);
+        });
     }
 
     let listener = TcpListener::bind(config.listen_addr).await?;