Admin add/remove peer (#7198)

N/A


  Adds endpoints to add and remove trusted peers from the http api. The added peers are trusted peers so they won't be disconnected for bad scores. We try to maintain a connection to the peer in case they disconnect from us by trying to dial it every heartbeat.

beacon_node/lighthouse_network/src/peer_manager/mod.rs

@@ -114,6 +114,7 @@ pub struct PeerManager<E: EthSpec> {
     metrics_enabled: bool,
     /// Keeps track of whether the QUIC protocol is enabled or not.
     quic_enabled: bool,
+    trusted_peers: HashSet<Enr>,
     /// The logger associated with the `PeerManager`.
     log: slog::Logger,
 }
@@ -195,6 +196,7 @@ impl<E: EthSpec> PeerManager<E> {
             discovery_enabled,
             metrics_enabled,
             quic_enabled,
+            trusted_peers: Default::default(),
             log: log.clone(),
         })
     }
@@ -894,7 +896,7 @@ impl<E: EthSpec> PeerManager<E> {
     }
 
     // Gracefully disconnects a peer without banning them.
-    fn disconnect_peer(&mut self, peer_id: PeerId, reason: GoodbyeReason) {
+    pub fn disconnect_peer(&mut self, peer_id: PeerId, reason: GoodbyeReason) {
         self.events
             .push(PeerManagerEvent::DisconnectPeer(peer_id, reason));
         self.network_globals
@@ -943,6 +945,13 @@ impl<E: EthSpec> PeerManager<E> {
         }
     }
 
+    fn maintain_trusted_peers(&mut self) {
+        let trusted_peers = self.trusted_peers.clone();
+        for trusted_peer in trusted_peers {
+            self.dial_peer(trusted_peer);
+        }
+    }
+
     /// This function checks the status of our current peers and optionally requests a discovery
     /// query if we need to find more peers to maintain the current number of peers
     fn maintain_peer_count(&mut self, dialing_peers: usize) {
@@ -1234,6 +1243,7 @@ impl<E: EthSpec> PeerManager<E> {
     fn heartbeat(&mut self) {
         // Optionally run a discovery query if we need more peers.
         self.maintain_peer_count(0);
+        self.maintain_trusted_peers();
 
         // Cleans up the connection state of dialing peers.
         // Libp2p dials peer-ids, but sometimes the response is from another peer-id or libp2p
@@ -1470,6 +1480,14 @@ impl<E: EthSpec> PeerManager<E> {
             )
         })
     }
+
+    pub fn add_trusted_peer(&mut self, enr: Enr) {
+        self.trusted_peers.insert(enr);
+    }
+
+    pub fn remove_trusted_peer(&mut self, enr: Enr) {
+        self.trusted_peers.remove(&enr);
+    }
 }
 
 enum ConnectingType {