Expose method to get blob gas price from plugins (#8843)

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

Author: fab-10

CHANGELOG.md

@@ -23,7 +23,7 @@
 - Introduce the `TransactionValidatorService` to allow plugins to add custom validation rules [#8793](https://github.com/hyperledger/besu/pull/8793)
 - Enable parallel tx processing by default if Bonsai is used [#8668](https://github.com/hyperledger/besu/pull/8668)
 - Increase mainnet gas limit to 45M [#8824](https://github.com/hyperledger/besu/pull/8824)
-
+- Expose a method to get blob gas price from plugins [#8843](https://github.com/hyperledger/besu/pull/8843)
 
 #### Fusaka Devnet
 - EIP-7825 - Transaction gas limit cap [#8700](https://github.com/hyperledger/besu/pull/8700)

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

@@ -14,6 +14,9 @@
  */
 package org.hyperledger.besu.services;
 
+import static org.hyperledger.besu.ethereum.mainnet.feemarket.ExcessBlobGasCalculator.calculateExcessBlobGasForParent;
+
+import org.hyperledger.besu.datatypes.BlobGas;
 import org.hyperledger.besu.datatypes.Hash;
 import org.hyperledger.besu.datatypes.Wei;
 import org.hyperledger.besu.ethereum.chain.MutableBlockchain;
@@ -120,6 +123,18 @@ public Optional<Wei> getNextBlockBaseFee() {
                     feeMarket.targetGasUsed(chainHeadHeader)));
   }
 
+  @Override
+  public Wei getBlobGasPrice(final BlockHeader blockHeader) {
+    final var protocolSpec = protocolSchedule.getByBlockHeader(blockHeader);
+    final var maybeParentHeader = blockchain.getBlockHeader(blockHeader.getParentHash());
+    return protocolSpec
+        .getFeeMarket()
+        .blobGasPricePerGas(
+            maybeParentHeader
+                .map(parent -> calculateExcessBlobGasForParent(protocolSpec, parent))
+                .orElse(BlobGas.ZERO));
+  }
+
   @Override
   public Optional<List<TransactionReceipt>> getReceiptsByBlockHash(final Hash blockHash) {
     return blockchain

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

@@ -81,7 +81,8 @@ public ProtocolSchedule getPostMergeSchedule() {
    * @return the ProtocolSpec to be used by the provided block
    */
   @Override
-  public ProtocolSpec getByBlockHeader(final ProcessableBlockHeader blockHeader) {
+  public ProtocolSpec getByBlockHeader(
+      final org.hyperledger.besu.plugin.data.ProcessableBlockHeader blockHeader) {
     return this.transitionUtils.dispatchFunctionAccordingToMergeState(
         protocolSchedule -> protocolSchedule.getByBlockHeader(blockHeader));
   }

ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/DefaultProtocolSchedule.java

@@ -19,9 +19,9 @@
 import org.hyperledger.besu.datatypes.HardforkId;
 import org.hyperledger.besu.ethereum.core.BlockHeader;
 import org.hyperledger.besu.ethereum.core.PermissionTransactionFilter;
-import org.hyperledger.besu.ethereum.core.ProcessableBlockHeader;
 import org.hyperledger.besu.ethereum.mainnet.ScheduledProtocolSpec.BlockNumberProtocolSpec;
 import org.hyperledger.besu.ethereum.mainnet.ScheduledProtocolSpec.TimestampProtocolSpec;
+import org.hyperledger.besu.plugin.data.ProcessableBlockHeader;
 import org.hyperledger.besu.plugin.services.txvalidator.TransactionValidationRule;
 
 import java.math.BigInteger;

ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/ProtocolSchedule.java

@@ -18,7 +18,7 @@
 import org.hyperledger.besu.ethereum.core.BlockHeader;
 import org.hyperledger.besu.ethereum.core.BlockHeaderBuilder;
 import org.hyperledger.besu.ethereum.core.PermissionTransactionFilter;
-import org.hyperledger.besu.ethereum.core.ProcessableBlockHeader;
+import org.hyperledger.besu.plugin.data.ProcessableBlockHeader;
 import org.hyperledger.besu.plugin.services.txvalidator.TransactionValidationRule;
 
 import java.math.BigInteger;

ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/ScheduledProtocolSpec.java

@@ -14,16 +14,17 @@
  */
 package org.hyperledger.besu.ethereum.mainnet;
 
-import org.hyperledger.besu.ethereum.core.ProcessableBlockHeader;
+import org.hyperledger.besu.plugin.data.ProcessableBlockHeader;
 
 /**
  * Associates a {@link ProtocolSpec} with a given block number or timestamp level starting point
  * Knows how to query the timestamp or block number of a given block header
  */
 public interface ScheduledProtocolSpec {
-  boolean isOnOrAfterMilestoneBoundary(ProcessableBlockHeader header);
+  boolean isOnOrAfterMilestoneBoundary(
+      org.hyperledger.besu.plugin.data.ProcessableBlockHeader header);
 
-  boolean isOnMilestoneBoundary(ProcessableBlockHeader header);
+  boolean isOnMilestoneBoundary(org.hyperledger.besu.plugin.data.ProcessableBlockHeader header);
 
   Hardfork fork();
 
@@ -60,12 +61,14 @@ private TimestampProtocolSpec(final long timestamp, final ProtocolSpec protocolS
     }
 
     @Override
-    public boolean isOnOrAfterMilestoneBoundary(final ProcessableBlockHeader header) {
+    public boolean isOnOrAfterMilestoneBoundary(
+        final org.hyperledger.besu.plugin.data.ProcessableBlockHeader header) {
       return Long.compareUnsigned(header.getTimestamp(), timestamp) >= 0;
     }
 
     @Override
-    public boolean isOnMilestoneBoundary(final ProcessableBlockHeader header) {
+    public boolean isOnMilestoneBoundary(
+        final org.hyperledger.besu.plugin.data.ProcessableBlockHeader header) {
       return header.getTimestamp() == timestamp;
     }
 
@@ -95,7 +98,8 @@ private BlockNumberProtocolSpec(final long blockNumber, final ProtocolSpec proto
     }
 
     @Override
-    public boolean isOnOrAfterMilestoneBoundary(final ProcessableBlockHeader header) {
+    public boolean isOnOrAfterMilestoneBoundary(
+        final org.hyperledger.besu.plugin.data.ProcessableBlockHeader header) {
       return header.getNumber() >= blockNumber;
     }
 

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 = '4lHVP5Gc91MkqyiTvU9HVlBZx0tOgodIdOmasEAGTtM='
+  knownHash = '2iFZ9OBdtl1VoQLGPdqolq8zlBIkwszjin8vO4TkTqk='
 }
 check.dependsOn('checkAPIChanges')
 

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

@@ -60,6 +60,14 @@ public interface BlockchainService extends BesuService {
    */
   Hash getChainHeadHash();
 
+  /**
+   * Return the blob gas price for the specified block
+   *
+   * @param blockHeader the block header
+   * @return the block gas price or Wei.ZERO if blobs are not yet supported for that block header
+   */
+  Wei getBlobGasPrice(BlockHeader blockHeader);
+
   /**
    * Get the receipts for a block by block hash
    *