bugfix getStorageByRootHash to only return head worldstate if the sup…

…plied optional rootHash is empty

Signed-off-by: garyschulte <garyschulte@gmail.com>

ethereum/core/src/main/java/org/hyperledger/besu/ethereum/bonsai/cache/CachedWorldStorageManager.java

@@ -14,8 +14,6 @@
  */
 package org.hyperledger.besu.ethereum.bonsai.cache;
 
-import com.github.benmanes.caffeine.cache.Cache;
-import com.github.benmanes.caffeine.cache.Caffeine;
 import org.hyperledger.besu.datatypes.Hash;
 import org.hyperledger.besu.ethereum.bonsai.BonsaiWorldStateProvider;
 import org.hyperledger.besu.ethereum.bonsai.storage.BonsaiSnapshotWorldStateKeyValueStorage;
@@ -45,6 +43,8 @@
 import java.util.stream.LongStream;
 import java.util.stream.Stream;
 
+import com.github.benmanes.caffeine.cache.Cache;
+import com.github.benmanes.caffeine.cache.Caffeine;
 import com.google.common.annotations.VisibleForTesting;
 import org.apache.tuweni.bytes.Bytes32;
 import org.slf4j.Logger;
@@ -55,10 +55,8 @@ public class CachedWorldStorageManager extends AbstractTrieLogManager
   private static final Logger LOG = LoggerFactory.getLogger(CachedWorldStorageManager.class);
   private final BonsaiWorldStateProvider archive;
   private final ObservableMetricsSystem metricsSystem;
-  private final Cache<Hash, Hash> stateRootToBlockHashCache = Caffeine.newBuilder()
-      .maximumSize(512)
-      .expireAfterWrite(100, TimeUnit.MINUTES)
-      .build();
+  private final Cache<Hash, Hash> stateRootToBlockHashCache =
+      Caffeine.newBuilder().maximumSize(512).expireAfterWrite(100, TimeUnit.MINUTES).build();
 
   CachedWorldStorageManager(
       final BonsaiWorldStateProvider archive,
@@ -214,10 +212,15 @@ public Optional<BonsaiWorldState> getHeadWorldState(
 
   @Override
   public Optional<CachedBonsaiWorldView> getStorageByRootHash(final Optional<Hash> rootHash) {
-    return rootHash.map(stateRootToBlockHashCache::getIfPresent)
-        .map(Optional::of)
-        .orElseGet(rootWorldStateStorage::getWorldStateBlockHash)
-        .map(cachedWorldStatesByHash::get);
+    if (rootHash.isPresent()) {
+      // if we supplied a hash, return the worldstate for that hash if it is available:
+      return rootHash
+          .map(stateRootToBlockHashCache::getIfPresent)
+          .map(cachedWorldStatesByHash::get);
+    } else {
+      // if we did not supply a hash, return the head worldstate from cachedWorldStates
+      return rootWorldStateStorage.getWorldStateBlockHash().map(cachedWorldStatesByHash::get);
+    }
   }
 
   @Override