Fix unhandled exception (#7743)

* clean up and use thread safe cache

Signed-off-by: stefan.pingel@consensys.net <stefan.pingel@consensys.net>

CHANGELOG.md

@@ -28,6 +28,7 @@
 - Corrects a regression where custom plugin services are not initialized correctly. [#7625](https://github.com/hyperledger/besu/pull/7625)
 - Fix for IBFT2 chains using the BONSAI DB format [#7631](https://github.com/hyperledger/besu/pull/7631)
 - Fix reading `tx-pool-min-score` option from configuration file [#7623](https://github.com/hyperledger/besu/pull/7623)
+- Fix an undhandled exception. [#7733](https://github.com/hyperledger/besu/issues/7733)
 
 ## 24.9.1
 

ethereum/p2p/src/main/java/org/hyperledger/besu/ethereum/p2p/discovery/internal/PeerTable.java

@@ -26,16 +26,17 @@ import org.hyperledger.besu.ethereum.p2p.peers.Peer;
 import org.hyperledger.besu.ethereum.p2p.peers.PeerId;
 
 import java.util.Arrays;
-import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ForkJoinPool;
+import java.util.concurrent.TimeUnit;
 import java.util.stream.Stream;
 
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
 import com.google.common.hash.BloomFilter;
-import org.apache.commons.collections4.queue.CircularFifoQueue;
 import org.apache.tuweni.bytes.Bytes;
 
 /**
@@ -54,10 +55,7 @@ public class PeerTable {
   private final Map<Bytes, Integer> distanceCache;
   private BloomFilter<Bytes> idBloom;
   private int evictionCnt = 0;
-  private final LinkedHashMapWithMaximumSize<String, Integer> ipAddressCheckMap =
-      new LinkedHashMapWithMaximumSize<>(DEFAULT_BUCKET_SIZE * N_BUCKETS);
-  private final CircularFifoQueue<String> invalidIPs =
-      new CircularFifoQueue<>(DEFAULT_BUCKET_SIZE * N_BUCKETS);
+  private final Cache<String, Integer> unresponsiveIPs;
 
   /**
    * Builds a new peer table, where distance is calculated using the provided nodeId as a baseline.
@@ -72,6 +70,11 @@ public class PeerTable {
             .toArray(Bucket[]::new);
     this.distanceCache = new ConcurrentHashMap<>();
     this.maxEntriesCnt = N_BUCKETS * DEFAULT_BUCKET_SIZE;
+    this.unresponsiveIPs =
+        CacheBuilder.newBuilder()
+            .maximumSize(maxEntriesCnt)
+            .expireAfterWrite(15L, TimeUnit.MINUTES)
+            .build();
 
     // A bloom filter with 4096 expected insertions of 64-byte keys with a 0.1% false positive
     // probability yields a memory footprint of ~7.5kb.
@@ -140,7 +143,6 @@ public class PeerTable {
     if (!res.isPresent()) {
       idBloom.put(id);
       distanceCache.put(id, distance);
-      ipAddressCheckMap.put(getKey(peer.getEndpoint()), peer.getEndpoint().getUdpPort());
       return AddResult.added();
     }
 
@@ -214,26 +216,12 @@ public class PeerTable {
 
   public boolean isIpAddressInvalid(final Endpoint endpoint) {
     final String key = getKey(endpoint);
-    if (invalidIPs.contains(key)) {
-      return true;
-    }
-    if (ipAddressCheckMap.containsKey(key) && ipAddressCheckMap.get(key) != endpoint.getUdpPort()) {
-      // This peer has multiple discovery services on the same IP address + TCP port.
-      invalidIPs.add(key);
-      for (final Bucket bucket : table) {
-        bucket.getPeers().stream()
-            .filter(p -> p.getEndpoint().getHost().equals(endpoint.getHost()))
-            .forEach(bucket::evict);
-      }
-      return true;
-    } else {
-      return false;
-    }
+    return unresponsiveIPs.getIfPresent(key) != null;
   }
 
   public void invalidateIP(final Endpoint endpoint) {
     final String key = getKey(endpoint);
-    invalidIPs.add(key);
+    unresponsiveIPs.put(key, Integer.MAX_VALUE);
   }
 
   private static String getKey(final Endpoint endpoint) {
@@ -313,20 +301,6 @@ public class PeerTable {
     }
   }
 
-  private static class LinkedHashMapWithMaximumSize<K, V> extends LinkedHashMap<K, V> {
-    private final int maxSize;
-
-    public LinkedHashMapWithMaximumSize(final int maxSize) {
-      super(maxSize, 0.75f, false);
-      this.maxSize = maxSize;
-    }
-
-    @Override
-    protected boolean removeEldestEntry(final Map.Entry<K, V> eldest) {
-      return size() > maxSize;
-    }
-  }
-
   static class EvictResult {
     public enum EvictOutcome {
       EVICTED,

ethereum/p2p/src/test/java/org/hyperledger/besu/ethereum/p2p/discovery/internal/PeerTableTest.java

@@ -188,15 +188,12 @@ public class PeerTableTest {
   @Test
   public void ipAddressIsInvalidReturnsTrue() {
     final Endpoint endpoint1 = new Endpoint("1.1.1.1", 2, Optional.of(Integer.valueOf(1)));
-    final Endpoint endpoint2 = new Endpoint("1.1.1.1", 3, Optional.of(Integer.valueOf(1)));
     final DiscoveryPeer peer1 = DiscoveryPeer.fromIdAndEndpoint(Peer.randomId(), endpoint1);
-    final DiscoveryPeer peer2 = DiscoveryPeer.fromIdAndEndpoint(Peer.randomId(), endpoint2);
     final PeerTable table = new PeerTable(Bytes.random(64));
 
-    final PeerTable.AddResult addResult1 = table.tryAdd(peer1);
-    assertThat(addResult1.getOutcome()).isEqualTo(PeerTable.AddResult.added().getOutcome());
+    table.invalidateIP(endpoint1);
 
-    assertThat(table.isIpAddressInvalid(peer2.getEndpoint())).isEqualTo(true);
+    assertThat(table.isIpAddressInvalid(peer1.getEndpoint())).isEqualTo(true);
   }
 
   @Test
@@ -216,16 +213,12 @@ public class PeerTableTest {
   @Test
   public void invalidIPAddressNotAdded() {
     final Endpoint endpoint1 = new Endpoint("1.1.1.1", 2, Optional.of(Integer.valueOf(1)));
-    final Endpoint endpoint2 = new Endpoint("1.1.1.1", 3, Optional.of(Integer.valueOf(1)));
     final DiscoveryPeer peer1 = DiscoveryPeer.fromIdAndEndpoint(Peer.randomId(), endpoint1);
-    final DiscoveryPeer peer2 = DiscoveryPeer.fromIdAndEndpoint(Peer.randomId(), endpoint2);
     final PeerTable table = new PeerTable(Bytes.random(64));
 
+    table.invalidateIP(endpoint1);
     final PeerTable.AddResult addResult1 = table.tryAdd(peer1);
-    assertThat(addResult1.getOutcome()).isEqualTo(PeerTable.AddResult.added().getOutcome());
-
-    final PeerTable.AddResult addResult2 = table.tryAdd(peer2);
-    assertThat(addResult2.getOutcome()).isEqualTo(PeerTable.AddResult.invalid().getOutcome());
+    assertThat(addResult1.getOutcome()).isEqualTo(PeerTable.AddResult.invalid().getOutcome());
   }
 
   @Test