From aa79810596d8608c1636006018f31b34197c2123 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Tue, 12 Sep 2023 14:35:19 +0200
Subject: [PATCH 1/2] Fix error when none of S3/K2V/WEB/ADMIN server is started
 (fix #613)

---
 src/garage/server.rs | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/src/garage/server.rs b/src/garage/server.rs
index 958089c6..472616c7 100644
--- a/src/garage/server.rs
+++ b/src/garage/server.rs
@@ -130,20 +130,27 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
 		warn!("This Garage version is built without the metrics feature");
 	}
 
-	// Stuff runs
+	if servers.is_empty() {
+		// Nothing runs except netapp (not in servers)
+		// Await shutdown signal before proceeding to shutting down netapp
+		wait_from(watch_cancel).await;
+	} else {
+		// Stuff runs
 
-	// When a cancel signal is sent, stuff stops
+		// When a cancel signal is sent, stuff stops
 
-	// Collect stuff
-	for (desc, join_handle) in servers {
-		if let Err(e) = join_handle.await? {
-			error!("{} server exited with error: {}", desc, e);
-		} else {
-			info!("{} server exited without error.", desc);
+		// Collect stuff
+		for (desc, join_handle) in servers {
+			if let Err(e) = join_handle.await? {
+				error!("{} server exited with error: {}", desc, e);
+			} else {
+				info!("{} server exited without error.", desc);
+			}
 		}
 	}
 
 	// Remove RPC handlers for system to break reference cycles
+	info!("Deregistering RPC handlers for shutdown...");
 	garage.system.netapp.drop_all_handlers();
 	opentelemetry::global::shutdown_tracer_provider();
 

From 91e764a2bf7a479a068fdfdad020cd79b5e86b88 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Tue, 12 Sep 2023 14:35:48 +0200
Subject: [PATCH 2/2] fix hang on shutdown

---
 src/rpc/system.rs | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/rpc/system.rs b/src/rpc/system.rs
index 36b58311..4daa5ba9 100644
--- a/src/rpc/system.rs
+++ b/src/rpc/system.rs
@@ -9,10 +9,10 @@ use std::time::{Duration, Instant};
 
 use arc_swap::ArcSwap;
 use async_trait::async_trait;
-use futures::{join, select};
-use futures_util::future::*;
+use futures::join;
 use serde::{Deserialize, Serialize};
 use sodiumoxide::crypto::sign::ed25519;
+use tokio::select;
 use tokio::sync::watch;
 use tokio::sync::Mutex;
 
@@ -702,7 +702,7 @@ impl System {
 
 	async fn status_exchange_loop(&self, mut stop_signal: watch::Receiver<bool>) {
 		while !*stop_signal.borrow() {
-			let restart_at = tokio::time::sleep(STATUS_EXCHANGE_INTERVAL);
+			let restart_at = Instant::now() + STATUS_EXCHANGE_INTERVAL;
 
 			self.update_local_status();
 			let local_status: NodeStatus = self.local_status.load().as_ref().clone();
@@ -711,13 +711,14 @@ impl System {
 				.broadcast(
 					&self.system_endpoint,
 					SystemRpc::AdvertiseStatus(local_status),
-					RequestStrategy::with_priority(PRIO_HIGH),
+					RequestStrategy::with_priority(PRIO_HIGH)
+						.with_custom_timeout(STATUS_EXCHANGE_INTERVAL),
 				)
 				.await;
 
 			select! {
-				_ = restart_at.fuse() => {},
-				_ = stop_signal.changed().fuse() => {},
+				_ = tokio::time::sleep_until(restart_at.into()) => {},
+				_ = stop_signal.changed() => {},
 			}
 		}
 	}
@@ -799,10 +800,9 @@ impl System {
 			#[cfg(feature = "kubernetes-discovery")]
 			tokio::spawn(self.clone().advertise_to_kubernetes());
 
-			let restart_at = tokio::time::sleep(DISCOVERY_INTERVAL);
 			select! {
-				_ = restart_at.fuse() => {},
-				_ = stop_signal.changed().fuse() => {},
+				_ = tokio::time::sleep(DISCOVERY_INTERVAL) => {},
+				_ = stop_signal.changed() => {},
 			}
 		}
 	}