handling IllegalArgumentException caused by Discovery Disabled Nodes in Endpoint.fromEnode

ethereum/p2p/src/main/java/org/hyperledger/besu/ethereum/p2p/discovery/Endpoint.java

@@ -29,12 +29,15 @@
 
 import com.google.common.net.InetAddresses;
 import org.apache.tuweni.bytes.Bytes;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Encapsulates the network coordinates of a {@link DiscoveryPeer} as well as serialization logic
  * used in various Discovery messages.
  */
 public class Endpoint {
+  private static final Logger LOG = LoggerFactory.getLogger(Endpoint.class);
   private final Optional<String> host;
   private final int udpPort;
   private final Optional<Integer> tcpPort;
@@ -49,15 +52,16 @@ public Endpoint(final String host, final int udpPort, final Optional<Integer> tc
   }
 
   public static Endpoint fromEnode(final EnodeURL enode) {
-    final int discoveryPort =
-        enode
-            .getDiscoveryPort()
-            .orElseThrow(
-                () ->
-                    new IllegalArgumentException(
-                        "Attempt to create a discovery endpoint for an enode with discovery disabled."));
+    Optional<Integer> discoveryPort = enode.getDiscoveryPort();
+
+    if (discoveryPort.isEmpty()) {
+      int defaultPort = EnodeURLImpl.DEFAULT_LISTENING_PORT;
+      LOG.debug("Discovery disabled for enode {}. Using default port {}.", enode, defaultPort);
+      return new Endpoint(enode.getIp().getHostAddress(), defaultPort, Optional.empty());
+    }
+
     final Optional<Integer> listeningPort = enode.getListeningPort();
-    return new Endpoint(enode.getIp().getHostAddress(), discoveryPort, listeningPort);
+    return new Endpoint(enode.getIp().getHostAddress(), discoveryPort.get(), listeningPort);
   }
 
   public EnodeURL toEnode(final Bytes nodeId) {

ethereum/p2p/src/test/java/org/hyperledger/besu/ethereum/p2p/discovery/PeerDiscoveryAgentTest.java

@@ -18,6 +18,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatCode;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
@@ -45,6 +46,8 @@
 import org.hyperledger.besu.ethereum.p2p.permissions.PeerPermissionsDenylist;
 import org.hyperledger.besu.plugin.data.EnodeURL;
 
+import java.net.InetAddress;
+import java.net.UnknownHostException;
 import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
@@ -898,6 +901,23 @@ public void assertHostCorrectlyRevertsOnIgnoredPacketFrom() {
     assertThat(PeerDiscoveryAgent.deriveHost(source, mockWellFormed)).isEqualTo(routableHost);
   }
 
+  @Test
+  void testFromEnodeWithDiscoveryDisabled() throws UnknownHostException {
+    EnodeURL enodeWithNoDiscovery = mock(EnodeURL.class);
+    when(enodeWithNoDiscovery.getDiscoveryPort()).thenReturn(Optional.empty());
+    when(enodeWithNoDiscovery.getListeningPort()).thenReturn(Optional.of(8545));
+
+    when(enodeWithNoDiscovery.getIp()).thenReturn(InetAddress.getByName("127.0.0.1"));
+
+    Endpoint result = Endpoint.fromEnode(enodeWithNoDiscovery);
+
+    assertEquals("127.0.0.1", result.getHost());
+
+    assertEquals(30303, result.getUdpPort());
+
+    assertEquals(Optional.empty(), result.getTcpPort());
+  }
+
   protected void bondViaIncomingPing(
       final MockPeerDiscoveryAgent agent, final MockPeerDiscoveryAgent otherNode) {
     final Packet pingPacket = helper.createPingPacket(otherNode, agent);