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