fix consensus issue. (#1803)

intermediate values of the base fee can be higher than maximum value encoded by a long. Now using BigInteger to compute intermediate fee delta.

Signed-off-by: Abdelhamid Bakhta <abdelhamid.bakhta@consensys.net>

ethereum/core/src/main/java/org/hyperledger/besu/ethereum/core/fees/EIP1559.java

@@ -14,12 +14,13 @@
  */
 package org.hyperledger.besu.ethereum.core.fees;
 
-import static java.lang.Math.floorDiv;
 import static java.lang.Math.max;
 
 import org.hyperledger.besu.config.experimental.ExperimentalEIPs;
 import org.hyperledger.besu.ethereum.core.BlockHeader;
 
+import java.math.BigInteger;
+
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -45,19 +46,19 @@ public class EIP1559 {
       return parentBaseFee;
     } else if (parentBlockGasUsed > targetGasUsed) {
       gasDelta = parentBlockGasUsed - targetGasUsed;
-      feeDelta =
+      final BigInteger pBaseFee = BigInteger.valueOf(parentBaseFee);
-          max(
+      final BigInteger gDelta = BigInteger.valueOf(gasDelta);
-              floorDiv(
+      final BigInteger target = BigInteger.valueOf(targetGasUsed);
-                  floorDiv(parentBaseFee * gasDelta, targetGasUsed),
+      final BigInteger denominator = BigInteger.valueOf(feeMarket.getBasefeeMaxChangeDenominator());
-                  feeMarket.getBasefeeMaxChangeDenominator()),
+      feeDelta = max(pBaseFee.multiply(gDelta).divide(target).divide(denominator).longValue(), 1);
-              1);
       baseFee = parentBaseFee + feeDelta;
     } else {
       gasDelta = targetGasUsed - parentBlockGasUsed;
-      feeDelta =
+      final BigInteger pBaseFee = BigInteger.valueOf(parentBaseFee);
-          floorDiv(
+      final BigInteger gDelta = BigInteger.valueOf(gasDelta);
-              floorDiv(parentBaseFee * gasDelta, targetGasUsed),
+      final BigInteger target = BigInteger.valueOf(targetGasUsed);
-              feeMarket.getBasefeeMaxChangeDenominator());
+      final BigInteger denominator = BigInteger.valueOf(feeMarket.getBasefeeMaxChangeDenominator());
+      feeDelta = pBaseFee.multiply(gDelta).divide(target).divide(denominator).longValue();
       baseFee = parentBaseFee - feeDelta;
     }
     LOG.trace(