Add get hardforkId by block number to Blockchain service

CHANGELOG.md

@@ -16,6 +16,7 @@
   - Fast Sync
 
 ### Additions and Improvements
+- Expose new method to query hardfork by block number Plugin API [#9115](https://github.com/hyperledger/besu/pull/9115)
 
 #### Fusaka devnets
 

acceptance-tests/test-plugins/src/main/java/org/hyperledger/besu/tests/acceptance/plugins/TestBlockchainServicePlugin.java

@@ -75,10 +75,12 @@ public void start() {
   private HardforkSeen queryHardfork(
       final BlockchainService blockchainService, final BlockHeader header) {
     final var currentHardfork = blockchainService.getHardforkId(header);
+    final var currentHardforkByNumber = blockchainService.getHardforkId(header.getNumber());
     final var nextHardfork =
         blockchainService.getNextBlockHardforkId(header, header.getTimestamp() + 1);
 
-    return new HardforkSeen(header.getNumber(), currentHardfork, nextHardfork);
+    return new HardforkSeen(
+        header.getNumber(), currentHardfork, currentHardforkByNumber, nextHardfork);
   }
 
   @Override
@@ -97,7 +99,11 @@ private void writeSeenHardforks() {
               .map(
                   r ->
                       String.join(
-                          ",", String.valueOf(r.blockNumber), r.current.name(), r.next.name()))
+                          ",",
+                          String.valueOf(r.blockNumber),
+                          r.current.name(),
+                          r.currentByNumber().name(),
+                          r.next.name()))
               .collect(Collectors.joining("\n"));
 
       Files.write(callbackFile.toPath(), content.getBytes(UTF_8));
@@ -107,5 +113,6 @@ private void writeSeenHardforks() {
     }
   }
 
-  private record HardforkSeen(long blockNumber, HardforkId current, HardforkId next) {}
+  private record HardforkSeen(
+      long blockNumber, HardforkId current, HardforkId currentByNumber, HardforkId next) {}
 }

acceptance-tests/tests/src/test/java/org/hyperledger/besu/tests/acceptance/plugins/BlockchainServicePluginTest.java

@@ -18,7 +18,6 @@
 
 import org.hyperledger.besu.tests.acceptance.dsl.AcceptanceTestBase;
 import org.hyperledger.besu.tests.acceptance.dsl.node.BesuNode;
-import org.hyperledger.besu.tests.acceptance.dsl.node.configuration.genesis.GenesisConfigurationFactory;
 
 import java.io.IOException;
 import java.nio.file.Files;
@@ -30,25 +29,18 @@
 import org.junit.jupiter.api.Test;
 
 public class BlockchainServicePluginTest extends AcceptanceTestBase {
-  private BesuNode minerNode;
   private BesuNode pluginNode;
 
   @BeforeEach
   public void setUp() throws Exception {
-    minerNode =
-        besu.createQbftNode(
-            "minerNode",
-            besuNodeConfigurationBuilder ->
-                besuNodeConfigurationBuilder.genesisConfigProvider(
-                    GenesisConfigurationFactory::createQbftLondonGenesisConfig));
     pluginNode =
         besu.createQbftPluginsNode(
             "pluginNode",
             Collections.singletonList("testPlugins"),
             Collections.singletonList("--plugin-tx-validator-test-enabled=true"),
             "DEBUG");
 
-    cluster.start(pluginNode, minerNode);
+    cluster.start(pluginNode);
   }
 
   @Test
@@ -57,7 +49,8 @@ public void hardforkListIsCorrect() throws IOException {
     waitForFile(hardforkListFile);
     final var fileContents = Files.readAllLines(hardforkListFile);
 
-    final var expectedLines = List.of("0,BERLIN,BERLIN", "1,BERLIN,LONDON", "2,LONDON,LONDON");
+    final var expectedLines =
+        List.of("0,BERLIN,BERLIN,BERLIN", "1,BERLIN,BERLIN,LONDON", "2,LONDON,LONDON,LONDON");
 
     for (int i = 0; i < expectedLines.size(); i++) {
       assertThat(fileContents.get(i)).isEqualTo(expectedLines.get(i));

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

@@ -233,6 +233,15 @@ public HardforkId getHardforkId(final BlockHeader blockHeader) {
     return protocolSchedule.getByBlockHeader(blockHeader).getHardforkId();
   }
 
+  @Override
+  public HardforkId getHardforkId(final long blockNumber) {
+    return blockchain
+        .getBlockHeader(blockNumber)
+        .map(this::getHardforkId)
+        .orElseThrow(
+            () -> new IllegalArgumentException("Block not found for number: " + blockNumber));
+  }
+
   @Override
   public HardforkId getNextBlockHardforkId(
       final BlockHeader parentBlockHeader, final long timestampForNextBlock) {

plugin-api/build.gradle

@@ -71,7 +71,7 @@ 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 = '5BI+4JAKgBsTClKWIeF86C3kS/RVT3Cdwyju/HydR9o='
+  knownHash = 'fhbRRCXyfMDwSkyEe+YhgUhzIu2/OWSMhttKCnmTqlc='
 }
 check.dependsOn('checkAPIChanges')
 

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

@@ -150,6 +150,16 @@ void setFinalizedBlock(Hash blockHash)
   @Unstable
   HardforkId getHardforkId(BlockHeader blockHeader);
 
+  /**
+   * Get the hardfork identifier for the given block number
+   *
+   * @param blockNumber the block number to determine the hardfork for
+   * @return the hardfork identifier applicable to the given block number
+   * @throws IllegalArgumentException if no block with that number exists
+   */
+  @Unstable
+  HardforkId getHardforkId(long blockNumber);
+
   /**
    * Get the hardfork identifier for the next block based on the parent block and timestamp
    *