[peer-metrics] refactor/simplify SystemMetrics

2 files changed, 41 insertions, 88 deletions

diff --git a/src/rpc/system.rs b/src/rpc/system.rs
index 147ec4d6..4a505f58 100644
--- a/src/rpc/system.rs
+++ b/src/rpc/system.rs
@@ -3,11 +3,9 @@ use std::collections::HashMap;
 use std::io::{Read, Write};
 use std::net::{IpAddr, SocketAddr};
 use std::path::{Path, PathBuf};
-use std::sync::atomic::Ordering;
 use std::sync::{Arc, RwLock};
 use std::time::{Duration, Instant};
 
-use arc_swap::ArcSwap;
 use async_trait::async_trait;
 use futures::join;
 use serde::{Deserialize, Serialize};
@@ -88,7 +86,7 @@ pub struct System {
 	persist_cluster_layout: Persister<ClusterLayout>,
 	persist_peer_list: Persister<PeerList>,
 
-	local_status: ArcSwap<NodeStatus>,
+	local_status: Arc<RwLock<NodeStatus>>,
 	node_status: RwLock<HashMap<Uuid, (u64, NodeStatus)>>,
 
 	pub netapp: Arc<NetApp>,
@@ -106,7 +104,7 @@ pub struct System {
 	#[cfg(feature = "kubernetes-discovery")]
 	kubernetes_discovery: Option<KubernetesDiscoveryConfig>,
 
-	metrics: SystemMetrics,
+	_metrics: SystemMetrics,
 
 	replication_mode: ReplicationMode,
 	replication_factor: usize,
@@ -280,10 +278,11 @@ impl System {
 			}
 		};
 
-		let metrics = SystemMetrics::new(replication_factor);
-
 		let mut local_status = NodeStatus::initial(replication_factor, &cluster_layout);
-		local_status.update_disk_usage(&config.metadata_dir, &config.data_dir, &metrics);
+		local_status.update_disk_usage(&config.metadata_dir, &config.data_dir);
+		let local_status = Arc::new(RwLock::new(local_status));
+
+		let metrics = SystemMetrics::new(replication_factor, local_status.clone());
 
 		let ring = Ring::new(cluster_layout, replication_factor);
 		let (update_ring, ring) = watch::channel(Arc::new(ring));
@@ -357,7 +356,7 @@ impl System {
 			id: netapp.id.into(),
 			persist_cluster_layout,
 			persist_peer_list,
-			local_status: ArcSwap::new(Arc::new(local_status)),
+			local_status,
 			node_status: RwLock::new(HashMap::new()),
 			netapp: netapp.clone(),
 			peering: peering.clone(),
@@ -377,7 +376,7 @@ impl System {
 			consul_discovery,
 			#[cfg(feature = "kubernetes-discovery")]
 			kubernetes_discovery: config.kubernetes_discovery.clone(),
-			metrics,
+			_metrics: metrics,
 
 			ring,
 			update_ring: Mutex::new(update_ring),
@@ -546,12 +545,9 @@ impl System {
 			}
 		};
 
+		let hostname = self.local_status.read().unwrap().hostname.clone();
 		if let Err(e) = c
-			.publish_consul_service(
-				self.netapp.id,
-				&self.local_status.load_full().hostname,
-				rpc_public_addr,
-			)
+			.publish_consul_service(self.netapp.id, &hostname, rpc_public_addr)
 			.await
 		{
 			error!("Error while publishing Consul service: {}", e);
@@ -573,13 +569,8 @@ impl System {
 			}
 		};
 
-		if let Err(e) = publish_kubernetes_node(
-			k,
-			self.netapp.id,
-			&self.local_status.load_full().hostname,
-			rpc_public_addr,
-		)
-		.await
+		let hostname = self.local_status.read().unwrap().hostname.clone();
+		if let Err(e) = publish_kubernetes_node(k, self.netapp.id, &hostname, rpc_public_addr).await
 		{
 			error!("Error while publishing node to Kubernetes: {}", e);
 		}
@@ -596,15 +587,13 @@ impl System {
 	}
 
 	fn update_local_status(&self) {
-		let mut new_si: NodeStatus = self.local_status.load().as_ref().clone();
+		let mut local_status = self.local_status.write().unwrap();
 
 		let ring = self.ring.borrow();
-		new_si.cluster_layout_version = ring.layout.version;
-		new_si.cluster_layout_staging_hash = ring.layout.staging_hash;
-
-		new_si.update_disk_usage(&self.metadata_dir, &self.data_dir, &self.metrics);
+		local_status.cluster_layout_version = ring.layout.version;
+		local_status.cluster_layout_staging_hash = ring.layout.staging_hash;
 
-		self.local_status.swap(Arc::new(new_si));
+		local_status.update_disk_usage(&self.metadata_dir, &self.data_dir);
 	}
 
 	// --- RPC HANDLERS ---
@@ -629,7 +618,7 @@ impl System {
 		from: Uuid,
 		info: &NodeStatus,
 	) -> Result<SystemRpc, Error> {
-		let local_info = self.local_status.load();
+		let local_info = self.local_status.read().unwrap();
 
 		if local_info.replication_factor < info.replication_factor {
 			error!("Some node have a higher replication factor ({}) than this one ({}). This is not supported and will lead to data corruption. Shutting down for safety.",
@@ -644,6 +633,8 @@ impl System {
 			tokio::spawn(self.clone().pull_cluster_layout(from));
 		}
 
+		drop(local_info);
+
 		self.node_status
 			.write()
 			.unwrap()
@@ -708,7 +699,7 @@ impl System {
 			let restart_at = Instant::now() + STATUS_EXCHANGE_INTERVAL;
 
 			self.update_local_status();
-			let local_status: NodeStatus = self.local_status.load().as_ref().clone();
+			let local_status: NodeStatus = self.local_status.read().unwrap().clone();
 			let _ = self
 				.rpc
 				.broadcast(
@@ -893,12 +884,7 @@ impl NodeStatus {
 		}
 	}
 
-	fn update_disk_usage(
-		&mut self,
-		meta_dir: &Path,
-		data_dir: &DataDirEnum,
-		metrics: &SystemMetrics,
-	) {
+	fn update_disk_usage(&mut self, meta_dir: &Path, data_dir: &DataDirEnum) {
 		use nix::sys::statvfs::statvfs;
 		let mount_avail = |path: &Path| match statvfs(path) {
 			Ok(x) => {
@@ -934,27 +920,6 @@ impl NodeStatus {
 				)
 			})(),
 		};
-
-		if let Some((avail, total)) = self.meta_disk_avail {
-			metrics
-				.values
-				.meta_disk_avail
-				.store(avail, Ordering::Relaxed);
-			metrics
-				.values
-				.meta_disk_total
-				.store(total, Ordering::Relaxed);
-		}
-		if let Some((avail, total)) = self.data_disk_avail {
-			metrics
-				.values
-				.data_disk_avail
-				.store(avail, Ordering::Relaxed);
-			metrics
-				.values
-				.data_disk_total
-				.store(total, Ordering::Relaxed);
-		}
 	}
 }
 
diff --git a/src/rpc/system_metrics.rs b/src/rpc/system_metrics.rs
index af81b71f..7b390c25 100644
--- a/src/rpc/system_metrics.rs
+++ b/src/rpc/system_metrics.rs
@@ -1,31 +1,22 @@
-use std::sync::atomic::{AtomicU64, Ordering};
-use std::sync::Arc;
+use std::sync::{Arc, RwLock};
 
 use opentelemetry::{global, metrics::*, KeyValue};
 
+use crate::system::NodeStatus;
+
 /// TableMetrics reference all counter used for metrics
 pub struct SystemMetrics {
 	pub(crate) _garage_build_info: ValueObserver<u64>,
 	pub(crate) _replication_factor: ValueObserver<u64>,
 	pub(crate) _disk_avail: ValueObserver<u64>,
 	pub(crate) _disk_total: ValueObserver<u64>,
-	pub(crate) values: Arc<SystemMetricsValues>,
-}
-
-#[derive(Default)]
-pub struct SystemMetricsValues {
-	pub(crate) data_disk_total: AtomicU64,
-	pub(crate) data_disk_avail: AtomicU64,
-	pub(crate) meta_disk_total: AtomicU64,
-	pub(crate) meta_disk_avail: AtomicU64,
 }
 
 impl SystemMetrics {
-	pub fn new(replication_factor: usize) -> Self {
+	pub fn new(replication_factor: usize, local_status: Arc<RwLock<NodeStatus>>) -> Self {
 		let meter = global::meter("garage_system");
-		let values = Arc::new(SystemMetricsValues::default());
-		let values1 = values.clone();
-		let values2 = values.clone();
+		let st1 = local_status.clone();
+		let st2 = local_status.clone();
 		Self {
 			_garage_build_info: meter
 				.u64_value_observer("garage_build_info", move |observer| {
@@ -47,31 +38,28 @@ impl SystemMetrics {
 				.init(),
 			_disk_avail: meter
 				.u64_value_observer("garage_local_disk_avail", move |observer| {
-					match values1.data_disk_avail.load(Ordering::Relaxed) {
-						0 => (),
-						x => observer.observe(x, &[KeyValue::new("volume", "data")]),
-					};
-					match values1.meta_disk_avail.load(Ordering::Relaxed) {
-						0 => (),
-						x => observer.observe(x, &[KeyValue::new("volume", "metadata")]),
-					};
+					let st = st1.read().unwrap();
+					if let Some((avail, _total)) = st.data_disk_avail {
+						observer.observe(avail, &[KeyValue::new("volume", "data")]);
+					}
+					if let Some((avail, _total)) = st.meta_disk_avail {
+						observer.observe(avail, &[KeyValue::new("volume", "metadata")]);
+					}
 				})
 				.with_description("Garage available disk space on each node")
 				.init(),
 			_disk_total: meter
 				.u64_value_observer("garage_local_disk_total", move |observer| {
-					match values2.data_disk_total.load(Ordering::Relaxed) {
-						0 => (),
-						x => observer.observe(x, &[KeyValue::new("volume", "data")]),
-					};
-					match values2.meta_disk_total.load(Ordering::Relaxed) {
-						0 => (),
-						x => observer.observe(x, &[KeyValue::new("volume", "metadata")]),
-					};
+					let st = st2.read().unwrap();
+					if let Some((_avail, total)) = st.data_disk_avail {
+						observer.observe(total, &[KeyValue::new("volume", "data")]);
+					}
+					if let Some((_avail, total)) = st.meta_disk_avail {
+						observer.observe(total, &[KeyValue::new("volume", "metadata")]);
+					}
 				})
 				.with_description("Garage total disk space on each node")
 				.init(),
-			values,
 		}
 	}
 }