Extend Blockchain service (#6592)

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## 24.2.1-SNAPSHOT
+
+### Breaking Changes
+
+### Deprecations
+
+### Additions and Improvements
+- Extend `Blockchain` service [#6592](https://github.com/hyperledger/besu/pull/6592)
+
+### Bug fixes
+
 ## 24.2.0-SNAPSHOT
 
 ### Breaking Changes

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

@@ -373,6 +373,7 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
 
   private final TransactionSelectionServiceImpl transactionSelectionServiceImpl;
   private final PluginTransactionValidatorServiceImpl transactionValidatorServiceImpl;
+  private final BlockchainServiceImpl blockchainServiceImpl;
 
   static class P2PDiscoveryOptionGroup {
 
@@ -957,7 +958,8 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
         new PkiBlockCreationConfigurationProvider(),
         new RpcEndpointServiceImpl(),
         new TransactionSelectionServiceImpl(),
-        new PluginTransactionValidatorServiceImpl());
+        new PluginTransactionValidatorServiceImpl(),
+        new BlockchainServiceImpl());
   }
 
   /**
@@ -979,6 +981,7 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
    * @param rpcEndpointServiceImpl instance of RpcEndpointServiceImpl
    * @param transactionSelectionServiceImpl instance of TransactionSelectionServiceImpl
    * @param transactionValidatorServiceImpl instance of TransactionValidatorServiceImpl
+   * @param blockchainServiceImpl instance of BlockchainServiceImpl
    */
   @VisibleForTesting
   protected BesuCommand(
@@ -997,7 +1000,8 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
       final PkiBlockCreationConfigurationProvider pkiBlockCreationConfigProvider,
       final RpcEndpointServiceImpl rpcEndpointServiceImpl,
       final TransactionSelectionServiceImpl transactionSelectionServiceImpl,
-      final PluginTransactionValidatorServiceImpl transactionValidatorServiceImpl) {
+      final PluginTransactionValidatorServiceImpl transactionValidatorServiceImpl,
+      final BlockchainServiceImpl blockchainServiceImpl) {
     this.besuComponent = besuComponent;
     this.logger = besuComponent.getBesuCommandLogger();
     this.rlpBlockImporter = rlpBlockImporter;
@@ -1017,6 +1021,7 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
     this.rpcEndpointServiceImpl = rpcEndpointServiceImpl;
     this.transactionSelectionServiceImpl = transactionSelectionServiceImpl;
     this.transactionValidatorServiceImpl = transactionValidatorServiceImpl;
+    this.blockchainServiceImpl = blockchainServiceImpl;
   }
 
   /**
@@ -1208,6 +1213,7 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
         TransactionSelectionService.class, transactionSelectionServiceImpl);
     besuPluginContext.addService(
         PluginTransactionValidatorService.class, transactionValidatorServiceImpl);
+    besuPluginContext.addService(BlockchainService.class, blockchainServiceImpl);
 
     // register built-in plugins
     rocksDBPlugin = new RocksDBPlugin();
@@ -1288,6 +1294,9 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
   }
 
   private void startPlugins() {
+    blockchainServiceImpl.init(
+        besuController.getProtocolContext(), besuController.getProtocolSchedule());
+
     besuPluginContext.addService(
         BesuEvents.class,
         new BesuEventsImpl(
@@ -1297,10 +1306,6 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
             besuController.getSyncState()));
     besuPluginContext.addService(MetricsSystem.class, getMetricsSystem());
 
-    besuPluginContext.addService(
-        BlockchainService.class,
-        new BlockchainServiceImpl(besuController.getProtocolContext().getBlockchain()));
-
     besuPluginContext.addService(
         TraceService.class,
         new TraceServiceImpl(

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

@@ -15,8 +15,13 @@
 
 package org.hyperledger.besu.services;
 
-import org.hyperledger.besu.ethereum.chain.Blockchain;
+import org.hyperledger.besu.datatypes.Hash;
+import org.hyperledger.besu.datatypes.Wei;
+import org.hyperledger.besu.ethereum.ProtocolContext;
 import org.hyperledger.besu.ethereum.core.BlockBody;
+import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
+import org.hyperledger.besu.ethereum.mainnet.feemarket.BaseFeeMarket;
+import org.hyperledger.besu.ethereum.mainnet.feemarket.FeeMarket;
 import org.hyperledger.besu.plugin.Unstable;
 import org.hyperledger.besu.plugin.data.BlockContext;
 import org.hyperledger.besu.plugin.data.BlockHeader;
@@ -29,15 +34,21 @@ import java.util.function.Supplier;
 @Unstable
 public class BlockchainServiceImpl implements BlockchainService {
 
-  private final Blockchain blockchain;
+  private ProtocolContext protocolContext;
+  private ProtocolSchedule protocolSchedule;
+
+  /** Create a new instance */
+  public BlockchainServiceImpl() {}
 
   /**
    * Instantiates a new Blockchain service.
    *
-   * @param blockchain the blockchain
+   * @param protocolContext the protocol context
+   * @param protocolSchedule the protocol schedule
    */
-  public BlockchainServiceImpl(final Blockchain blockchain) {
-    this.blockchain = blockchain;
+  public void init(final ProtocolContext protocolContext, final ProtocolSchedule protocolSchedule) {
+    this.protocolContext = protocolContext;
+    this.protocolSchedule = protocolSchedule;
   }
 
   /**
@@ -48,11 +59,39 @@ public class BlockchainServiceImpl implements BlockchainService {
    */
   @Override
   public Optional<BlockContext> getBlockByNumber(final long number) {
-    return blockchain
+    return protocolContext
+        .getBlockchain()
         .getBlockByNumber(number)
         .map(block -> blockContext(block::getHeader, block::getBody));
   }
 
+  @Override
+  public Hash getChainHeadHash() {
+    return protocolContext.getBlockchain().getChainHeadHash();
+  }
+
+  @Override
+  public BlockHeader getChainHeadHeader() {
+    return protocolContext.getBlockchain().getChainHeadHeader();
+  }
+
+  @Override
+  public Optional<Wei> getNextBlockBaseFee() {
+    final var chainHeadHeader = protocolContext.getBlockchain().getChainHeadHeader();
+    final var protocolSpec =
+        protocolSchedule.getForNextBlockHeader(chainHeadHeader, System.currentTimeMillis());
+    return Optional.of(protocolSpec.getFeeMarket())
+        .filter(FeeMarket::implementsBaseFee)
+        .map(BaseFeeMarket.class::cast)
+        .map(
+            feeMarket ->
+                feeMarket.computeBaseFee(
+                    chainHeadHeader.getNumber() + 1,
+                    chainHeadHeader.getBaseFee().orElse(Wei.ZERO),
+                    chainHeadHeader.getGasUsed(),
+                    feeMarket.targetGasUsed(chainHeadHeader)));
+  }
+
   private static BlockContext blockContext(
       final Supplier<BlockHeader> blockHeaderSupplier,
       final Supplier<BlockBody> blockBodySupplier) {

besu/src/test/java/org/hyperledger/besu/cli/CommandTestAbstract.java

@@ -83,6 +83,7 @@ import org.hyperledger.besu.plugin.services.storage.PrivacyKeyValueStorageFactor
 import org.hyperledger.besu.plugin.services.storage.SegmentIdentifier;
 import org.hyperledger.besu.services.BesuConfigurationImpl;
 import org.hyperledger.besu.services.BesuPluginContextImpl;
+import org.hyperledger.besu.services.BlockchainServiceImpl;
 import org.hyperledger.besu.services.PermissioningServiceImpl;
 import org.hyperledger.besu.services.PluginTransactionValidatorServiceImpl;
 import org.hyperledger.besu.services.PrivacyPluginServiceImpl;
@@ -564,7 +565,8 @@ public abstract class CommandTestAbstract {
           pkiBlockCreationConfigProvider,
           rpcEndpointServiceImpl,
           new TransactionSelectionServiceImpl(),
-          new PluginTransactionValidatorServiceImpl());
+          new PluginTransactionValidatorServiceImpl(),
+          new BlockchainServiceImpl());
     }
 
     @Override

plugin-api/build.gradle

@@ -69,7 +69,7 @@ Calculated : ${currentHash}
 tasks.register('checkAPIChanges', FileStateChecker) {
   description = "Checks that the API for the Plugin-API project does not change without deliberate thought"
   files = sourceSets.main.allJava.files
-  knownHash = 'f6P3+XG9GjPYEg7zrXHlujoE2/4axgd+EjKGDDJVVp8='
+  knownHash = 'Pi7Veo9W9kmjDJJNB89UTUXbYyRmoN6osK/tD163h3E='
 }
 check.dependsOn('checkAPIChanges')
 

plugin-api/src/main/java/org/hyperledger/besu/plugin/services/BlockchainService.java

@@ -14,8 +14,11 @@
  */
 package org.hyperledger.besu.plugin.services;
 
+import org.hyperledger.besu.datatypes.Hash;
+import org.hyperledger.besu.datatypes.Wei;
 import org.hyperledger.besu.plugin.Unstable;
 import org.hyperledger.besu.plugin.data.BlockContext;
+import org.hyperledger.besu.plugin.data.BlockHeader;
 
 import java.util.Optional;
 
@@ -29,4 +32,25 @@ public interface BlockchainService extends BesuService {
    * @return the BlockContext
    */
   Optional<BlockContext> getBlockByNumber(final long number);
+
+  /**
+   * Get the hash of the chain head
+   *
+   * @return chain head hash
+   */
+  Hash getChainHeadHash();
+
+  /**
+   * Get the block header of the chain head
+   *
+   * @return chain head block header
+   */
+  BlockHeader getChainHeadHeader();
+
+  /**
+   * Return the base fee for the next block
+   *
+   * @return base fee of the next block or empty if the fee market does not support base fee
+   */
+  Optional<Wei> getNextBlockBaseFee();
 }