[#1273] Expose revert reason field through GraphQL

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/graphql/internal/pojoadapter/TransactionAdapter.java

@@ -26,6 +26,7 @@
 import org.hyperledger.besu.ethereum.core.BlockHeader;
 import org.hyperledger.besu.ethereum.core.LogWithMetadata;
 import org.hyperledger.besu.ethereum.core.Transaction;
+import org.hyperledger.besu.ethereum.core.TransactionReceipt;
 import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
 import org.hyperledger.besu.ethereum.rlp.BytesValueRLPOutput;
 
@@ -292,6 +293,23 @@ public Optional<Long> getStatus(final DataFetchingEnvironment environment) {
                     : Optional.of((long) receipt.getStatus()));
   }
 
+  /**
+   * Retrieves the revert reason of the transaction, if any.
+   *
+   * <p>This method uses the getReceipt method to get the receipt of the transaction. It then checks
+   * the revert reason of the receipt. It would be an empty Optional for successful transactions.
+   * Otherwise, it returns an Optional containing the revert reason.
+   *
+   * @param environment the data fetching environment.
+   * @return an Optional containing a Bytes object representing the revert reason of the
+   *     transaction, or an empty Optional .
+   */
+  public Optional<Bytes> getRevertReason(final DataFetchingEnvironment environment) {
+    return getReceipt(environment)
+        .map(TransactionReceiptWithMetadata::getReceipt)
+        .flatMap(TransactionReceipt::getRevertReason);
+  }
+
   /**
    * Retrieves the gas used by the transaction.
    *

ethereum/api/src/main/resources/schema.graphqls

@@ -579,6 +579,9 @@ type Transaction {
   BlobVersionedHashes is a set of hash outputs from the blobs in the transaction.
   """
   blobVersionedHashes: [Bytes32!]
+
+  """Reason returned when transaction fails."""
+  revertReason: Bytes
 }
 
 """EIP-4895"""