fix(wallet): fix ctrl-c handler on windows platflorm

wallet/src/signal.rs

@@ -3,15 +3,23 @@ use actix::prelude::*;
 
 /// It will call `cb` function for Ctrl-c events (or SIGTERM signals in Unix).
 pub fn ctrl_c<T: Fn() + 'static>(cb: T) {
+    // This is received when doing kill $(pidof witnet), removing this handler will make the wallet
+    // shutdown instantly and corrupt the database.
     #[cfg(unix)]
     let sigterm = tokio_signal::unix::Signal::new(tokio_signal::unix::SIGTERM)
-        .map(|s| s.map(|_| ()))
+        .map(|s| s.map(|_| log::trace!("Received SIGTERM signal")))
         .flatten_stream();
 
+    // There is no equivalent to SIGTERM on Windows, so use empty stream
     #[cfg(windows)]
-    let sigterm = futures::future::ok(()).into_stream();
+    let sigterm = futures::stream::empty();
 
-    let ctrl_c = tokio_signal::ctrl_c().flatten_stream();
+    // This is received when pressing CTRL-C, and it works on both Unix and Windows
+    let ctrl_c = tokio_signal::ctrl_c()
+        .flatten_stream()
+        .inspect(|_| log::trace!("Received CTRL-C"));
+
+    // Handle both CTRL-C and SIGTERM using the same callback
     let handle_shutdown = ctrl_c
         .select(sigterm)
         .for_each(move |_| {