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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package tests
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/params"
)
//go:generate gencodec -type DifficultyTest -field-override difficultyTestMarshaling -out gen_difficultytest.go
type DifficultyTest struct {
ParentTimestamp *big.Int `json:"parentTimestamp"`
ParentDifficulty *big.Int `json:"parentDifficulty"`
UncleHash common.Hash `json:"parentUncles"`
CurrentTimestamp *big.Int `json:"currentTimestamp"`
CurrentBlockNumber uint64 `json:"currentBlockNumber"`
CurrentDifficulty *big.Int `json:"currentDifficulty"`
}
type difficultyTestMarshaling struct {
ParentTimestamp *math.HexOrDecimal256
ParentDifficulty *math.HexOrDecimal256
CurrentTimestamp *math.HexOrDecimal256
CurrentDifficulty *math.HexOrDecimal256
UncleHash common.Hash
CurrentBlockNumber math.HexOrDecimal64
}
func (test *DifficultyTest) Run(config *params.ChainConfig) error {
parentNumber := big.NewInt(int64(test.CurrentBlockNumber - 1))
parent := &types.Header{
Difficulty: test.ParentDifficulty,
Time: test.ParentTimestamp,
Number: parentNumber,
UncleHash: test.UncleHash,
}
actual := ethash.CalcDifficulty(config, test.CurrentTimestamp.Uint64(), parent)
exp := test.CurrentDifficulty
if actual.Cmp(exp) != 0 {
return fmt.Errorf("parent[time %v diff %v unclehash:%x] child[time %v number %v] diff %v != expected %v",
test.ParentTimestamp, test.ParentDifficulty, test.UncleHash,
test.CurrentTimestamp, test.CurrentBlockNumber, actual, exp)
}
return nil
}
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