capture signal handling in a function

src/signal.rs

@@ -0,0 +1,21 @@
+use tokio::{
+    select,
+    signal::unix::{signal, SignalKind},
+    sync::watch,
+};
+
+pub(crate) fn signal_handler() -> watch::Receiver<()> {
+    let (stop_tx, stop_rx) = watch::channel(());
+    tokio::spawn(async move {
+        let mut sigterm = signal(SignalKind::terminate()).unwrap();
+        let mut sigint = signal(SignalKind::interrupt()).unwrap();
+        loop {
+            select! {
+                _ = sigterm.recv() => println!("Receive SIGTERM"),
+                _ = sigint.recv() => println!("Receive SIGTERM"),
+            };
+            stop_tx.send(()).unwrap();
+        }
+    });
+    stop_rx
+}