Support post merge at genesis so that hive tests can run

besu/src/main/java/org/hyperledger/besu/controller/MergeBesuControllerBuilder.java

@@ -14,6 +14,7 @@
  */
 package org.hyperledger.besu.controller;
 
+import org.hyperledger.besu.config.GenesisConfigOptions;
 import org.hyperledger.besu.consensus.merge.MergeContext;
 import org.hyperledger.besu.consensus.merge.MergeProtocolSchedule;
 import org.hyperledger.besu.consensus.merge.PostMergeContext;
@@ -186,19 +187,24 @@ protected MergeContext createConsensusContext(
       final WorldStateArchive worldStateArchive,
       final ProtocolSchedule protocolSchedule) {
 
-    OptionalLong terminalBlockNumber = configOptionsSupplier.get().getTerminalBlockNumber();
-    Optional<Hash> terminalBlockHash = configOptionsSupplier.get().getTerminalBlockHash();
+    final GenesisConfigOptions genesisConfigOptions = configOptionsSupplier.get();
+    final OptionalLong terminalBlockNumber = genesisConfigOptions.getTerminalBlockNumber();
+    final Optional<Hash> terminalBlockHash = genesisConfigOptions.getTerminalBlockHash();
+    final boolean isPostMergeAtGenesis =
+        genesisConfigOptions.getTerminalTotalDifficulty().isPresent()
+            && genesisConfigOptions.getTerminalTotalDifficulty().get().isZero()
+            && blockchain.getGenesisBlockHeader().getDifficulty().isZero();
 
     final MergeContext mergeContext =
         PostMergeContext.get()
             .setSyncState(syncState.get())
             .setTerminalTotalDifficulty(
-                configOptionsSupplier
-                    .get()
+                genesisConfigOptions
                     .getTerminalTotalDifficulty()
                     .map(Difficulty::of)
                     .orElse(Difficulty.ZERO))
-            .setCheckpointPostMergeSync(syncConfig.isCheckpointPostMergeEnabled());
+            .setCheckpointPostMergeSync(syncConfig.isCheckpointPostMergeEnabled())
+            .setPostMergeAtGenesis(isPostMergeAtGenesis);
 
     blockchain
         .getFinalized()

consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/MergeContext.java

@@ -192,4 +192,11 @@ default boolean isChainPruningEnabled() {
    * @return the boolean
    */
   boolean isCheckpointPostMergeSync();
+
+  /**
+   * Is configured for a post-merge from genesis.
+   *
+   * @return the boolean
+   */
+  boolean isPostMergeAtGenesis();
 }

consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/PostMergeContext.java

@@ -70,6 +70,7 @@ public class PostMergeContext implements MergeContext {
   private final AtomicReference<Optional<BlockHeader>> terminalPoWBlock =
       new AtomicReference<>(Optional.empty());
   private boolean isCheckpointPostMergeSync;
+  private boolean isPostMergeAtGenesis;
 
   // TODO: cleanup - isChainPruningEnabled will not be required after
   // https://github.com/hyperledger/besu/pull/4703 is merged.
@@ -329,4 +330,20 @@ public PostMergeContext setCheckpointPostMergeSync(final boolean isCheckpointPos
   public boolean isCheckpointPostMergeSync() {
     return this.isCheckpointPostMergeSync;
   }
+
+  @Override
+  public boolean isPostMergeAtGenesis() {
+    return this.isPostMergeAtGenesis;
+  }
+
+  /**
+   * Sets whether it is post merge at genesis
+   *
+   * @param isPostMergeAtGenesis the is post merge at genesis state
+   * @return the post merge context
+   */
+  public PostMergeContext setPostMergeAtGenesis(final boolean isPostMergeAtGenesis) {
+    this.isPostMergeAtGenesis = isPostMergeAtGenesis;
+    return this;
+  }
 }

consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/TransitionContext.java

@@ -154,4 +154,9 @@ public Optional<BlockWithReceipts> retrieveBlockById(final PayloadIdentifier pay
   public boolean isCheckpointPostMergeSync() {
     return false;
   }
+
+  @Override
+  public boolean isPostMergeAtGenesis() {
+    return postMergeContext.isPostMergeAtGenesis();
+  }
 }

consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/TransitionUtils.java

@@ -116,15 +116,21 @@ public static boolean isTerminalProofOfWorkBlock(
             // if we cannot find difficulty or are merge-at-genesis
             .orElse(Difficulty.ZERO);
 
+    final MergeContext consensusContext = context.getConsensusContext(MergeContext.class);
+
+    // Genesis is configured for post-merge we will never have a terminal pow block
+    if (consensusContext.isPostMergeAtGenesis()) {
+      return false;
+    }
+
     if (currentChainTotalDifficulty.isZero()) {
       warnLambda(
           LOG,
           "unable to get total difficulty for {}, parent hash {} difficulty not found",
           header::toLogString,
           header::getParentHash);
     }
-    Difficulty configuredTotalTerminalDifficulty =
-        context.getConsensusContext(MergeContext.class).getTerminalTotalDifficulty();
+    Difficulty configuredTotalTerminalDifficulty = consensusContext.getTerminalTotalDifficulty();
 
     if (currentChainTotalDifficulty
             .add(headerDifficulty)

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/AbstractEngineForkchoiceUpdated.java

@@ -121,6 +121,7 @@ public JsonRpcResponse syncResponse(final JsonRpcRequestContext requestContext)
     // TODO: post-merge cleanup, this should be unnecessary after merge
     if (requireTerminalPoWBlockValidation()
         && !mergeContext.get().isCheckpointPostMergeSync()
+        && !mergeContext.get().isPostMergeAtGenesis()
         && !mergeCoordinator.latestValidAncestorDescendsFromTerminal(newHead)
         && !mergeContext.get().isChainPruningEnabled()) {
       logForkchoiceUpdatedCall(INVALID, forkChoice);

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/AbstractEngineNewPayload.java

@@ -213,6 +213,7 @@ public JsonRpcResponse syncResponse(final JsonRpcRequestContext requestContext)
     // TODO: post-merge cleanup
     if (requireTerminalPoWBlockValidation()
         && !mergeContext.get().isCheckpointPostMergeSync()
+        && !mergeContext.get().isPostMergeAtGenesis()
         && !mergeCoordinator.latestValidAncestorDescendsFromTerminal(newBlockHeader)
         && !mergeContext.get().isChainPruningEnabled()) {
       mergeCoordinator.addBadBlock(block, Optional.empty());

ethereum/core/src/main/java/org/hyperledger/besu/ethereum/chain/Blockchain.java

@@ -94,6 +94,11 @@ default Block getGenesisBlock() {
         .orElseThrow(() -> new IllegalStateException("Missing genesis block."));
   }
 
+  default BlockHeader getGenesisBlockHeader() {
+    return getBlockHeader(BlockHeader.GENESIS_BLOCK_NUMBER)
+        .orElseThrow(() -> new IllegalStateException("Missing genesis block header."));
+  }
+
   default Optional<Block> getBlockByHash(final Hash blockHash) {
     return getBlockHeader(blockHash)
         .flatMap(header -> getBlockBody(blockHash).map(body -> new Block(header, body)));