rpc helper: small refactorings

src/rpc/rpc_helper.rs

@@ -436,13 +436,12 @@ impl RpcHelper {
 		H: StreamingEndpointHandler<M> + 'static,
 		S: Send + 'static,
 	{
-		let msg = msg.into_req().map_err(netapp::error::Error::from)?;
-
 		// Peers may appear in many quorum sets. Here, build a list of peers,
 		// mapping to the index of the quorum sets in which they appear.
 		let mut result_tracker = QuorumSetResultTracker::new(to_sets, quorum);
 
 		// Send one request to each peer of the quorum sets
+		let msg = msg.into_req().map_err(netapp::error::Error::from)?;
 		let requests = result_tracker.nodes.iter().map(|(peer, _)| {
 			let self2 = self.clone();
 			let msg = msg.clone();
@@ -523,10 +522,10 @@ impl RpcHelper {
 	) -> Vec<Uuid> {
 		// Retrieve some status variables that we will use to sort requests
 		let peer_list = self.0.fullmesh.get_peer_list();
-		let our_zone = match layout.current().node_role(&self.0.our_node_id) {
-			Some(pc) => &pc.zone,
-			None => "",
-		};
+		let our_zone = layout
+			.current()
+			.get_node_zone(&self.0.our_node_id)
+			.unwrap_or("");
 
 		// Augment requests with some information used to sort them.
 		// The tuples are as follows:
@@ -536,10 +535,7 @@ impl RpcHelper {
 		// and within a same zone we priorize nodes with the lowest latency.
 		let mut nodes = nodes
 			.map(|to| {
-				let peer_zone = match layout.current().node_role(&to) {
-					Some(pc) => &pc.zone,
-					None => "",
-				};
+				let peer_zone = layout.current().get_node_zone(&to).unwrap_or("");
 				let peer_avg_ping = peer_list
 					.iter()
 					.find(|x| x.id.as_ref() == to.as_slice())
@@ -567,21 +563,28 @@ impl RpcHelper {
 // ------- utility for tracking successes/errors among write sets --------
 
 pub struct QuorumSetResultTracker<S, E> {
-	// The set of nodes and the quorum sets they belong to
+	/// The set of nodes and the index of the quorum sets they belong to
 	pub nodes: HashMap<Uuid, Vec<usize>>,
+	/// The quorum value, i.e. number of success responses to await in each set
 	pub quorum: usize,
 
-	// The success and error responses received
+	/// The success responses received
 	pub successes: Vec<(Uuid, S)>,
+	/// The error responses received
 	pub failures: Vec<(Uuid, E)>,
 
-	// The counters for successes and failures in each set
+	/// The counters for successes in each set
 	pub success_counters: Box<[usize]>,
+	/// The counters for failures in each set
 	pub failure_counters: Box<[usize]>,
+	/// The total number of nodes in each set
 	pub set_lens: Box<[usize]>,
 }
 
-impl<S, E: std::fmt::Display> QuorumSetResultTracker<S, E> {
+impl<S, E> QuorumSetResultTracker<S, E>
+where
+	E: std::fmt::Display,
+{
 	pub fn new<A>(sets: &[A], quorum: usize) -> Self
 	where
 		A: AsRef<[Uuid]>,