github.com/SmartMeshFoundation/Spectrum@v0.0.0-20220621030607-452a266fee1e/tests/difficulty_test_util.go (about)

     1  // Copyright 2017 The Spectrum Authors
     2  // This file is part of the Spectrum library.
     3  //
     4  // The Spectrum 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 Spectrum 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 Spectrum library. If not, see <http://www.gnu.org/licenses/>.
    16  //
    17  
    18  package tests
    19  
    20  import (
    21  	"fmt"
    22  	"math/big"
    23  
    24  	"github.com/SmartMeshFoundation/Spectrum/common"
    25  	"github.com/SmartMeshFoundation/Spectrum/common/math"
    26  	"github.com/SmartMeshFoundation/Spectrum/consensus/ethash"
    27  	"github.com/SmartMeshFoundation/Spectrum/core/types"
    28  	"github.com/SmartMeshFoundation/Spectrum/params"
    29  )
    30  
    31  //go:generate gencodec -type DifficultyTest -field-override difficultyTestMarshaling -out gen_difficultytest.go
    32  
    33  type DifficultyTest struct {
    34  	ParentTimestamp    *big.Int    `json:"parentTimestamp"`
    35  	ParentDifficulty   *big.Int    `json:"parentDifficulty"`
    36  	UncleHash          common.Hash `json:"parentUncles"`
    37  	CurrentTimestamp   *big.Int    `json:"currentTimestamp"`
    38  	CurrentBlockNumber uint64      `json:"currentBlockNumber"`
    39  	CurrentDifficulty  *big.Int    `json:"currentDifficulty"`
    40  }
    41  
    42  type difficultyTestMarshaling struct {
    43  	ParentTimestamp    *math.HexOrDecimal256
    44  	ParentDifficulty   *math.HexOrDecimal256
    45  	CurrentTimestamp   *math.HexOrDecimal256
    46  	CurrentDifficulty  *math.HexOrDecimal256
    47  	UncleHash          common.Hash
    48  	CurrentBlockNumber math.HexOrDecimal64
    49  }
    50  
    51  func (test *DifficultyTest) Run(config *params.ChainConfig) error {
    52  	parentNumber := big.NewInt(int64(test.CurrentBlockNumber - 1))
    53  	parent := &types.Header{
    54  		Difficulty: test.ParentDifficulty,
    55  		Time:       test.ParentTimestamp,
    56  		Number:     parentNumber,
    57  		UncleHash:  test.UncleHash,
    58  	}
    59  
    60  	actual := ethash.CalcDifficulty(config, test.CurrentTimestamp.Uint64(), parent)
    61  	exp := test.CurrentDifficulty
    62  
    63  	if actual.Cmp(exp) != 0 {
    64  		return fmt.Errorf("parent[time %v diff %v unclehash:%x] child[time %v number %v] diff %v != expected %v",
    65  			test.ParentTimestamp, test.ParentDifficulty, test.UncleHash,
    66  			test.CurrentTimestamp, test.CurrentBlockNumber, actual, exp)
    67  	}
    68  	return nil
    69  
    70  }