eth_simulateV1 - Add BlockSimulator feature

besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java

@@ -152,6 +152,7 @@
 import org.hyperledger.besu.plugin.data.EnodeURL;
 import org.hyperledger.besu.plugin.services.BesuConfiguration;
 import org.hyperledger.besu.plugin.services.BesuEvents;
+import org.hyperledger.besu.plugin.services.BlockSimulationService;
 import org.hyperledger.besu.plugin.services.BlockchainService;
 import org.hyperledger.besu.plugin.services.MetricsSystem;
 import org.hyperledger.besu.plugin.services.PermissioningService;
@@ -178,6 +179,7 @@
 import org.hyperledger.besu.services.BesuConfigurationImpl;
 import org.hyperledger.besu.services.BesuEventsImpl;
 import org.hyperledger.besu.services.BesuPluginContextImpl;
+import org.hyperledger.besu.services.BlockSimulatorServiceImpl;
 import org.hyperledger.besu.services.BlockchainServiceImpl;
 import org.hyperledger.besu.services.MiningServiceImpl;
 import org.hyperledger.besu.services.P2PServiceImpl;
@@ -1296,6 +1298,14 @@ private void startPlugins(final Runner runner) {
     besuPluginContext.addService(
         MiningService.class, new MiningServiceImpl(besuController.getMiningCoordinator()));
 
+    besuPluginContext.addService(
+        BlockSimulationService.class,
+        new BlockSimulatorServiceImpl(
+            besuController.getProtocolContext().getWorldStateArchive(),
+            miningParametersSupplier.get(),
+            besuController.getTransactionSimulator(),
+            besuController.getProtocolSchedule()));
+
     besuController.getAdditionalPluginServices().appendPluginServices(besuPluginContext);
     besuPluginContext.startPlugins();
   }

besu/src/main/java/org/hyperledger/besu/services/BlockSimulatorServiceImpl.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright contributors to Besu.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.services;
+
+import org.hyperledger.besu.datatypes.AccountOverrideMap;
+import org.hyperledger.besu.datatypes.BlockOverrides;
+import org.hyperledger.besu.datatypes.Transaction;
+import org.hyperledger.besu.ethereum.core.MiningConfiguration;
+import org.hyperledger.besu.ethereum.core.MutableWorldState;
+import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
+import org.hyperledger.besu.ethereum.transaction.BlockSimulator;
+import org.hyperledger.besu.ethereum.transaction.BlockStateCall;
+import org.hyperledger.besu.ethereum.transaction.CallParameter;
+import org.hyperledger.besu.ethereum.transaction.TransactionSimulator;
+import org.hyperledger.besu.ethereum.worldstate.WorldStateArchive;
+import org.hyperledger.besu.plugin.Unstable;
+import org.hyperledger.besu.plugin.data.BlockHeader;
+import org.hyperledger.besu.plugin.data.BlockSimulationResult;
+import org.hyperledger.besu.plugin.data.TransactionSimulationResult;
+import org.hyperledger.besu.plugin.services.BlockSimulationService;
+
+import java.util.List;
+
+/** This class is a service that simulates the processing of a block */
+public class BlockSimulatorServiceImpl implements BlockSimulationService {
+  private final BlockSimulator blockSimulator;
+  private final WorldStateArchive worldStateArchive;
+
+  /**
+   * This constructor creates a BlockSimulatorServiceImpl object
+   *
+   * @param worldStateArchive the world state archive
+   * @param miningConfiguration the mining configuration
+   * @param transactionSimulator the transaction simulator
+   * @param protocolSchedule the protocol schedule
+   */
+  public BlockSimulatorServiceImpl(
+      final WorldStateArchive worldStateArchive,
+      final MiningConfiguration miningConfiguration,
+      final TransactionSimulator transactionSimulator,
+      final ProtocolSchedule protocolSchedule) {
+    blockSimulator =
+        new BlockSimulator(
+            worldStateArchive, protocolSchedule, transactionSimulator, miningConfiguration);
+    this.worldStateArchive = worldStateArchive;
+  }
+
+  /**
+   * Simulate the processing of a block given a header, a list of transactions, and blockOverrides.
+   *
+   * @param header the header
+   * @param transactions the transactions to include in the block
+   * @param blockOverrides the blockSimulationOverride of the block
+   * @return the block context
+   */
+  @Override
+  public BlockSimulationResult simulate(
+      final BlockHeader header,
+      final List<? extends Transaction> transactions,
+      final BlockOverrides blockOverrides) {
+    BlockStateCall blockStateCall = createBlockStateCall(transactions, blockOverrides);
+    var headerCore = (org.hyperledger.besu.ethereum.core.BlockHeader) header;
+
+    var result = blockSimulator.process(headerCore, List.of(blockStateCall));
+    return response(result.getFirst());
+  }
+
+  /**
+   * This method is experimental and should be used with caution
+   *
+   * @param header the block header
+   * @param transactions the transactions to include in the block
+   * @param blockOverrides the blockSimulationOverride of the block
+   * @return the block context
+   */
+  @Unstable
+  @Override
+  public BlockSimulationResult importBlockUnsafe(
+      final BlockHeader header,
+      final List<? extends Transaction> transactions,
+      final BlockOverrides blockOverrides) {
+
+    BlockStateCall blockStateCall = createBlockStateCall(transactions, blockOverrides);
+    var headerCore = (org.hyperledger.besu.ethereum.core.BlockHeader) header;
+    try (final MutableWorldState ws =
+        worldStateArchive
+            .getMutable(headerCore, true)
+            .orElseThrow(
+                () ->
+                    new IllegalArgumentException(
+                        "World state not available for block number (block hash): "
+                            + headerCore.toLogString()))) {
+      var results = blockSimulator.process(headerCore, List.of(blockStateCall), ws);
+      var result = results.getFirst();
+      ws.persist(result.getBlock().getHeader());
+      return response(result);
+    } catch (final Exception e) {
+      throw new RuntimeException("Error simulating block", e);
+    }
+  }
+
+  private BlockStateCall createBlockStateCall(
+      final List<? extends Transaction> transactions, final BlockOverrides blockOverrides) {
+    var callParameters = transactions.stream().map(CallParameter::fromTransaction).toList();
+    return new BlockStateCall(callParameters, blockOverrides, new AccountOverrideMap(), true);
+  }
+
+  private BlockSimulationResult response(
+      final org.hyperledger.besu.ethereum.transaction.BlockSimulationResult result) {
+    return new BlockSimulationResult(
+        result.getBlockHeader(),
+        result.getBlockBody(),
+        result.getReceipts(),
+        result.getTransactionSimulations().stream()
+            .map(
+                simulation ->
+                    new TransactionSimulationResult(simulation.transaction(), simulation.result()))
+            .toList());
+  }
+}

besu/src/main/java/org/hyperledger/besu/services/BlockchainServiceImpl.java

@@ -108,7 +108,7 @@ public Optional<List<TransactionReceipt>> getReceiptsByBlockHash(final Hash bloc
   public void storeBlock(
       final BlockHeader blockHeader,
       final BlockBody blockBody,
-      final List<TransactionReceipt> receipts) {
+      final List<? extends TransactionReceipt> receipts) {
     final org.hyperledger.besu.ethereum.core.BlockHeader coreHeader =
         (org.hyperledger.besu.ethereum.core.BlockHeader) blockHeader;
     final org.hyperledger.besu.ethereum.core.BlockBody coreBody =