Coverage Summary for Class: ParentGasLimitRule (org.ethereum.validator)

Class Class, % Method, % Line, %
ParentGasLimitRule 0% (0/1) 0% (0/3) 0% (0/11)


1 /* 2  * This file is part of RskJ 3  * Copyright (C) 2017 RSK Labs Ltd. 4  * (derived from ethereumJ library, Copyright (c) 2016 <ether.camp>) 5  * 6  * This program is free software: you can redistribute it and/or modify 7  * it under the terms of the GNU Lesser General Public License as published by 8  * the Free Software Foundation, either version 3 of the License, or 9  * (at your option) any later version. 10  * 11  * This program is distributed in the hope that it will be useful, 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14  * GNU Lesser General Public License for more details. 15  * 16  * You should have received a copy of the GNU Lesser General Public License 17  * along with this program. If not, see <http://www.gnu.org/licenses/>. 18  */ 19  20 package org.ethereum.validator; 21  22 import org.ethereum.core.BlockHeader; 23 import org.slf4j.Logger; 24 import org.slf4j.LoggerFactory; 25  26 import java.math.BigInteger; 27  28 /** 29  * Checks if {@link BlockHeader#gasLimit} matches gas limit bounds. <br> 30  * 31  * This check is NOT run in Frontier 32  * 33  * @author Mikhail Kalinin 34  * @since 02.09.2015 35  */ 36 public class ParentGasLimitRule extends DependentBlockHeaderRule { 37  38  private static final Logger logger = LoggerFactory.getLogger(ParentGasLimitRule.class); 39  40  private BigInteger gasLimitBoundDivisor; 41  42  public ParentGasLimitRule(int gasLimitBoundDivisor) { 43  this.gasLimitBoundDivisor = BigInteger.valueOf(gasLimitBoundDivisor); 44  } 45  46  47  @Override 48  public boolean validate(BlockHeader header, BlockHeader parent) { 49  50  BigInteger headerGasLimit = new BigInteger(1, header.getGasLimit()); 51  BigInteger parentGasLimit = new BigInteger(1, parent.getGasLimit()); 52  BigInteger deltaLimit = parentGasLimit.divide(gasLimitBoundDivisor); 53  54  if (headerGasLimit.compareTo(parentGasLimit.subtract(deltaLimit)) < 0 || 55  headerGasLimit.compareTo(parentGasLimit.add(deltaLimit)) > 0) { 56  logger.error(String.format("#%d: gas limit exceeds parentBlock.getGasLimit() (+-) GAS_LIMIT_BOUND_DIVISOR", header.getNumber())); 57  return false; 58  } 59  return true; 60  } 61 }