feat: perform controlled shutdown on ctrl-c

Closes kemitix/git-next#94

Controlled shutdown includes attempting to unregister webhooks.

crates/server-actor/src/handlers/mod.rs

@@ -1,3 +1,4 @@
 mod file_updated;
 mod receive_server_config;
 mod receive_valid_server_config;
+mod shutdown;

crates/server-actor/src/handlers/shutdown.rs

@@ -0,0 +1,15 @@
+//-
+use actix::prelude::*;
+use git_next_webhook_actor::ShutdownWebhook;
+
+use crate::{messages::Shutdown, Server};
+
+impl Handler<Shutdown> for Server {
+    type Result = ();
+
+    fn handle(&mut self, _msg: Shutdown, _ctx: &mut Self::Context) -> Self::Result {
+        if let Some(webhook) = self.webhook.take() {
+            webhook.do_send(ShutdownWebhook);
+        }
+    }
+}

crates/server-actor/src/lib.rs

@@ -3,7 +3,7 @@
 mod tests;
 
 mod handlers;
-mod messages;
+pub mod messages;
 
 use actix::prelude::*;
 use git_next_config as config;

crates/server-actor/src/messages.rs

@@ -19,3 +19,5 @@ pub struct ValidServerConfig {
     pub server_storage: ServerStorage,
 }
 message!(ReceiveValidServerConfig: ValidServerConfig: "Notification of validated server configuration.");
+
+message!(Shutdown: "Notification to shutdown the server actor");

crates/server/src/lib.rs

@@ -44,7 +44,7 @@ pub fn start(
         server.do_send(FileUpdated);
 
         info!("Starting File Watcher...");
-        let fw = match FileWatcher::new("git-next-server.toml".into(), server.recipient()) {
+        let fw = match FileWatcher::new("git-next-server.toml".into(), server.clone().recipient()) {
             Ok(fw) => fw,
             Err(err) => {
                 error!(?err, "Failed to start file watcher");
@@ -56,6 +56,7 @@ pub fn start(
         info!("Server running - Press Ctrl-C to stop...");
         let _ = actix_rt::signal::ctrl_c().await;
         info!("Ctrl-C received, shutting down...");
+        server.do_send(git_next_server_actor::messages::Shutdown);
         System::current().stop();
     };
     let system = System::new();