fix TransactionLocation in DefaultBlockchain unsafeImportBlock() (#7956)

* fix TransactionLocation in DefaultBlockchain unsafeImportBlock() and make some readability improvements

Signed-off-by: stefan.pingel@consensys.net <stefan.pingel@consensys.net>

ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/query/PrivacyQueriesTest.java

@@ -223,10 +223,11 @@ public class PrivacyQueriesTest {
       final BlockHeader blockHeader,
       final List<PrivateTransactionMetadata> transactionMetadataList) {
 
-    for (int i = 0; i < transactionMetadataList.size(); i++) {
-      final PrivateTransactionMetadata privateTransactionMetadata = transactionMetadataList.get(i);
+    for (int index = 0; index < transactionMetadataList.size(); index++) {
+      final PrivateTransactionMetadata privateTransactionMetadata =
+          transactionMetadataList.get(index);
       final Hash pmtHash = privateTransactionMetadata.getPrivateMarkerTransactionHash();
-      final TransactionLocation pmtLocation = new TransactionLocation(blockHeader.getHash(), i);
+      final TransactionLocation pmtLocation = new TransactionLocation(blockHeader.getHash(), index);
       when(blockchainQueries.transactionLocationByHash(pmtHash))
           .thenReturn(Optional.of(pmtLocation));
     }

ethereum/core/src/main/java/org/hyperledger/besu/ethereum/chain/DefaultBlockchain.java

@@ -485,18 +485,14 @@ public class DefaultBlockchain implements MutableBlockchain {
       final List<TransactionReceipt> transactionReceipts,
       final Optional<Difficulty> maybeTotalDifficulty) {
     final BlockchainStorage.Updater updater = blockchainStorage.updater();
-    final Hash hash = block.getHash();
-    updater.putBlockHeader(hash, block.getHeader());
-    updater.putBlockHash(block.getHeader().getNumber(), hash);
-    updater.putBlockBody(hash, block.getBody());
-    final int nbTrx = block.getBody().getTransactions().size();
-    for (int i = 0; i < nbTrx; i++) {
-      final Hash transactionHash = block.getBody().getTransactions().get(i).getHash();
-      updater.putTransactionLocation(transactionHash, new TransactionLocation(transactionHash, i));
-    }
-    updater.putTransactionReceipts(hash, transactionReceipts);
+    final Hash blockHash = block.getHash();
+    updater.putBlockHeader(blockHash, block.getHeader());
+    updater.putBlockHash(block.getHeader().getNumber(), blockHash);
+    updater.putBlockBody(blockHash, block.getBody());
+    indexTransactionsForBlock(updater, blockHash, block.getBody().getTransactions());
+    updater.putTransactionReceipts(blockHash, transactionReceipts);
     maybeTotalDifficulty.ifPresent(
-        totalDifficulty -> updater.putTotalDifficulty(hash, totalDifficulty));
+        totalDifficulty -> updater.putTotalDifficulty(blockHash, totalDifficulty));
     updater.commit();
   }
 
@@ -563,7 +559,7 @@ public class DefaultBlockchain implements MutableBlockchain {
 
     updater.putBlockHash(blockWithReceipts.getNumber(), newBlockHash);
     updater.setChainHead(newBlockHash);
-    indexTransactionForBlock(
+    indexTransactionsForBlock(
         updater, newBlockHash, blockWithReceipts.getBlock().getBody().getTransactions());
     gasUsedCounter.inc(blockWithReceipts.getHeader().getGasUsed());
     numberOfTransactionsCounter.inc(
@@ -652,7 +648,7 @@ public class DefaultBlockchain implements MutableBlockchain {
     // Update indexed transactions
     newTransactions.forEach(
         (blockHash, transactionsInBlock) -> {
-          indexTransactionForBlock(updater, blockHash, transactionsInBlock);
+          indexTransactionsForBlock(updater, blockHash, transactionsInBlock);
           // Don't remove transactions that are being re-indexed.
           removedTransactions.removeAll(transactionsInBlock);
         });
@@ -792,11 +788,11 @@ public class DefaultBlockchain implements MutableBlockchain {
     chainHeadOmmerCount = block.getBody().getOmmers().size();
   }
 
-  private static void indexTransactionForBlock(
-      final BlockchainStorage.Updater updater, final Hash hash, final List<Transaction> txs) {
-    for (int i = 0; i < txs.size(); i++) {
-      final Hash txHash = txs.get(i).getHash();
-      final TransactionLocation loc = new TransactionLocation(hash, i);
+  private static void indexTransactionsForBlock(
+      final BlockchainStorage.Updater updater, final Hash blockHash, final List<Transaction> txs) {
+    for (int index = 0; index < txs.size(); index++) {
+      final Hash txHash = txs.get(index).getHash();
+      final TransactionLocation loc = new TransactionLocation(blockHash, index);
       updater.putTransactionLocation(txHash, loc);
     }
   }