Discovery patch (#2382)

* Upgrade libp2p and unstable gossip

* Network protocol upgrades

* Correct dependencies, reduce incoming bucket limit

* Clean up dirty DHT entries before repopulating

* Update cargo lock

* Update lockfile

* Update ENR dep

* Update deps to specific versions

* Update test dependencies

* Update docker rust, and remote signer tests

* More remote signer test fixes

* Temp commit

* Update discovery

* Remove cached enrs after dialing

* Increase the session capacity, for improved efficiency

beacon_node/eth2_libp2p/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Sigma Prime <contact@sigmaprime.io>"]
 edition = "2018"
 
 [dependencies]
-discv5 = { version = "0.1.0-beta.4", features = ["libp2p"] }
+discv5 = { version = "0.1.0-beta.5", features = ["libp2p"] }
 unsigned-varint = { version = "0.6.0", features = ["codec"] }
 types = { path =  "../../consensus/types" }
 hashset_delay = { path = "../../common/hashset_delay" }

beacon_node/eth2_libp2p/src/config.rs

@@ -154,7 +154,7 @@ impl Default for Config {
         // discv5 configuration
         let discv5_config = Discv5ConfigBuilder::new()
             .enable_packet_filter()
-            .session_cache_capacity(1000)
+            .session_cache_capacity(5000)
             .request_timeout(Duration::from_secs(1))
             .query_peer_timeout(Duration::from_secs(2))
             .query_timeout(Duration::from_secs(30))

beacon_node/eth2_libp2p/src/discovery/mod.rs

@@ -295,6 +295,11 @@ impl<TSpec: EthSpec> Discovery<TSpec> {
         self.cached_enrs.iter()
     }
 
+    /// Removes a cached ENR from the list.
+    pub fn remove_cached_enr(&mut self, peer_id: &PeerId) -> Option<Enr> {
+        self.cached_enrs.pop(peer_id)
+    }
+
     /// This adds a new `FindPeers` query to the queue if one doesn't already exist.
     pub fn discover_peers(&mut self) {
         // If the discv5 service isn't running or we are in the process of a query, don't bother queuing a new one.
@@ -502,6 +507,7 @@ impl<TSpec: EthSpec> Discovery<TSpec> {
         }
     }
 
+    /// Unbans the peer in discovery.
     pub fn unban_peer(&mut self, peer_id: &PeerId, ip_addresses: Vec<IpAddr>) {
         // first try and convert the peer_id to a node_id.
         if let Ok(node_id) = peer_id_to_node_id(peer_id) {
@@ -514,11 +520,15 @@ impl<TSpec: EthSpec> Discovery<TSpec> {
         }
     }
 
-    // mark node as disconnected in DHT, freeing up space for other nodes
+    ///  Marks node as disconnected in the DHT, freeing up space for other nodes, this also removes
+    ///  nodes from the cached ENR list.
     pub fn disconnect_peer(&mut self, peer_id: &PeerId) {
         if let Ok(node_id) = peer_id_to_node_id(peer_id) {
             self.discv5.disconnect_node(&node_id);
         }
+        // Remove the peer from the cached list, to prevent redialing disconnected
+        // peers.
+        self.cached_enrs.pop(peer_id);
     }
 
     /* Internal Functions */

beacon_node/eth2_libp2p/src/peer_manager/mod.rs

@@ -580,10 +580,7 @@ impl<TSpec: EthSpec> PeerManager<TSpec> {
             // ENR's may have multiple Multiaddrs. The multi-addr associated with the UDP
             // port is removed, which is assumed to be associated with the discv5 protocol (and
             // therefore irrelevant for other libp2p components).
-            let mut out_list = enr.multiaddr();
-            out_list.retain(|addr| !addr.iter().any(|v| matches!(v, MProtocol::Udp(_))));
-
-            out_list
+            enr.multiaddr_tcp()
         } else {
             // PeerId is not known
             Vec::new()
@@ -674,6 +671,8 @@ impl<TSpec: EthSpec> PeerManager<TSpec> {
             .collect();
         for peer_id in &peers_to_dial {
             debug!(self.log, "Dialing cached ENR peer"; "peer_id" => %peer_id);
+            // Remove the ENR from the cache to prevent continual re-dialing on disconnects
+            self.discovery.remove_cached_enr(&peer_id);
             self.dial_peer(peer_id);
         }
     }