From 95e3a39b4d0fe6de551fac61e9f88ce488e41477 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Mon, 19 Feb 2024 18:07:35 +0100
Subject: [PATCH] [networking-fixes] small refactoring in garage_net peering

---
 src/net/peering.rs | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/src/net/peering.rs b/src/net/peering.rs
index 3f0b2279..61882a18 100644
--- a/src/net/peering.rs
+++ b/src/net/peering.rs
@@ -164,23 +164,22 @@ struct KnownHosts {
 impl KnownHosts {
 	fn new() -> Self {
 		let list = HashMap::new();
-		let hash = Self::calculate_hash(&list);
+		let hash = Self::calculate_hash(vec![]);
 		Self { list, hash }
 	}
 	fn update_hash(&mut self) {
-		self.hash = Self::calculate_hash(&self.list);
+		self.hash = Self::calculate_hash(self.connected_peers_vec());
 	}
-	fn map_into_vec(input: &HashMap<NodeID, PeerInfoInternal>) -> Vec<(NodeID, SocketAddr)> {
-		let mut list = Vec::with_capacity(input.len());
-		for (id, peer) in input.iter() {
-			if peer.state == PeerConnState::Connected || peer.state == PeerConnState::Ourself {
+	fn connected_peers_vec(&self) -> Vec<(NodeID, SocketAddr)> {
+		let mut list = Vec::with_capacity(self.list.len());
+		for (id, peer) in self.list.iter() {
+			if peer.state.is_up() {
 				list.push((*id, peer.addr));
 			}
 		}
 		list
 	}
-	fn calculate_hash(input: &HashMap<NodeID, PeerInfoInternal>) -> hash::Digest {
-		let mut list = Self::map_into_vec(input);
+	fn calculate_hash(mut list: Vec<(NodeID, SocketAddr)>) -> hash::Digest {
 		list.sort();
 		let mut hash_state = hash::State::new();
 		for (id, addr) in list {
@@ -231,6 +230,7 @@ impl PeeringManager {
 				netapp.id,
 				PeerInfoInternal::new(addr, PeerConnState::Ourself),
 			);
+			known_hosts.update_hash();
 		}
 
 		// TODO for v0.10 / v1.0 : rename the endpoint (it will break compatibility)
@@ -251,13 +251,11 @@ impl PeeringManager {
 
 		let strat2 = strat.clone();
 		netapp.on_connected(move |id: NodeID, addr: SocketAddr, is_incoming: bool| {
-			let strat2 = strat2.clone();
 			strat2.on_connected(id, addr, is_incoming);
 		});
 
 		let strat2 = strat.clone();
 		netapp.on_disconnected(move |id: NodeID, is_incoming: bool| {
-			let strat2 = strat2.clone();
 			strat2.on_disconnected(id, is_incoming);
 		});
 
@@ -462,7 +460,7 @@ impl PeeringManager {
 	}
 
 	async fn exchange_peers(self: Arc<Self>, id: &NodeID) {
-		let peer_list = KnownHosts::map_into_vec(&self.known_hosts.read().unwrap().list);
+		let peer_list = self.known_hosts.read().unwrap().connected_peers_vec();
 		let pex_message = PeerListMessage { list: peer_list };
 		match self
 			.peer_list_endpoint
@@ -550,7 +548,7 @@ impl PeeringManager {
 		}
 	}
 
-	fn on_connected(self: Arc<Self>, id: NodeID, addr: SocketAddr, is_incoming: bool) {
+	fn on_connected(self: &Arc<Self>, id: NodeID, addr: SocketAddr, is_incoming: bool) {
 		let mut known_hosts = self.known_hosts.write().unwrap();
 		if is_incoming {
 			if let Some(host) = known_hosts.list.get_mut(&id) {
@@ -578,7 +576,7 @@ impl PeeringManager {
 		self.update_public_peer_list(&known_hosts);
 	}
 
-	fn on_disconnected(self: Arc<Self>, id: NodeID, is_incoming: bool) {
+	fn on_disconnected(self: &Arc<Self>, id: NodeID, is_incoming: bool) {
 		if !is_incoming {
 			info!("Connection to {} was closed", hex::encode(&id[..8]));
 			let mut known_hosts = self.known_hosts.write().unwrap();
@@ -620,7 +618,7 @@ impl EndpointHandler<PeerListMessage> for PeeringManager {
 		_from: NodeID,
 	) -> PeerListMessage {
 		self.handle_peer_list(&peer_list.list[..]);
-		let peer_list = KnownHosts::map_into_vec(&self.known_hosts.read().unwrap().list);
+		let peer_list = self.known_hosts.read().unwrap().connected_peers_vec();
 		PeerListMessage { list: peer_list }
 	}
 }