github.com/lukasz-zimnoch/go-ethereum@v1.9.7/tests/difficulty_test_util.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package tests
    18  
    19  import (
    20  	"fmt"
    21  	"math/big"
    22  
    23  	"github.com/ethereum/go-ethereum/common"
    24  	"github.com/ethereum/go-ethereum/common/math"
    25  	"github.com/ethereum/go-ethereum/consensus/ethash"
    26  	"github.com/ethereum/go-ethereum/core/types"
    27  	"github.com/ethereum/go-ethereum/params"
    28  )
    29  
    30  //go:generate gencodec -type DifficultyTest -field-override difficultyTestMarshaling -out gen_difficultytest.go
    31  
    32  type DifficultyTest struct {
    33  	ParentTimestamp    uint64      `json:"parentTimestamp"`
    34  	ParentDifficulty   *big.Int    `json:"parentDifficulty"`
    35  	UncleHash          common.Hash `json:"parentUncles"`
    36  	CurrentTimestamp   uint64      `json:"currentTimestamp"`
    37  	CurrentBlockNumber uint64      `json:"currentBlockNumber"`
    38  	CurrentDifficulty  *big.Int    `json:"currentDifficulty"`
    39  }
    40  
    41  type difficultyTestMarshaling struct {
    42  	ParentTimestamp    math.HexOrDecimal64
    43  	ParentDifficulty   *math.HexOrDecimal256
    44  	CurrentTimestamp   math.HexOrDecimal64
    45  	CurrentDifficulty  *math.HexOrDecimal256
    46  	UncleHash          common.Hash
    47  	CurrentBlockNumber math.HexOrDecimal64
    48  }
    49  
    50  func (test *DifficultyTest) Run(config *params.ChainConfig) error {
    51  	parentNumber := big.NewInt(int64(test.CurrentBlockNumber - 1))
    52  	parent := &types.Header{
    53  		Difficulty: test.ParentDifficulty,
    54  		Time:       test.ParentTimestamp,
    55  		Number:     parentNumber,
    56  		UncleHash:  test.UncleHash,
    57  	}
    58  
    59  	actual := ethash.CalcDifficulty(config, test.CurrentTimestamp, parent)
    60  	exp := test.CurrentDifficulty
    61  
    62  	if actual.Cmp(exp) != 0 {
    63  		return fmt.Errorf("parent[time %v diff %v unclehash:%x] child[time %v number %v] diff %v != expected %v",
    64  			test.ParentTimestamp, test.ParentDifficulty, test.UncleHash,
    65  			test.CurrentTimestamp, test.CurrentBlockNumber, actual, exp)
    66  	}
    67  	return nil
    68  
    69  }