mirror of https://github.com/ethereum/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
115 lines
2.6 KiB
115 lines
2.6 KiB
// Copyright 2014 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 ezp
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"math/big"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/crypto/sha3"
|
|
"github.com/ethereum/go-ethereum/logger"
|
|
"github.com/ethereum/go-ethereum/pow"
|
|
)
|
|
|
|
var powlogger = logger.NewLogger("POW")
|
|
|
|
type EasyPow struct {
|
|
hash *big.Int
|
|
HashRate int64
|
|
turbo bool
|
|
}
|
|
|
|
func New() *EasyPow {
|
|
return &EasyPow{turbo: false}
|
|
}
|
|
|
|
func (pow *EasyPow) GetHashrate() int64 {
|
|
return pow.HashRate
|
|
}
|
|
|
|
func (pow *EasyPow) Turbo(on bool) {
|
|
pow.turbo = on
|
|
}
|
|
|
|
func (pow *EasyPow) Search(block pow.Block, stop <-chan struct{}) (uint64, []byte) {
|
|
r := rand.New(rand.NewSource(time.Now().UnixNano()))
|
|
hash := block.HashNoNonce()
|
|
diff := block.Difficulty()
|
|
//i := int64(0)
|
|
// TODO fix offset
|
|
i := rand.Int63()
|
|
starti := i
|
|
start := time.Now().UnixNano()
|
|
|
|
defer func() { pow.HashRate = 0 }()
|
|
|
|
// Make sure stop is empty
|
|
empty:
|
|
for {
|
|
select {
|
|
case <-stop:
|
|
default:
|
|
break empty
|
|
}
|
|
}
|
|
|
|
for {
|
|
select {
|
|
case <-stop:
|
|
return 0, nil
|
|
default:
|
|
i++
|
|
|
|
elapsed := time.Now().UnixNano() - start
|
|
hashes := ((float64(1e9) / float64(elapsed)) * float64(i-starti)) / 1000
|
|
pow.HashRate = int64(hashes)
|
|
|
|
sha := uint64(r.Int63())
|
|
if verify(hash, diff, sha) {
|
|
return sha, nil
|
|
}
|
|
}
|
|
|
|
if !pow.turbo {
|
|
time.Sleep(20 * time.Microsecond)
|
|
}
|
|
}
|
|
|
|
return 0, nil
|
|
}
|
|
|
|
func (pow *EasyPow) Verify(block pow.Block) bool {
|
|
return Verify(block)
|
|
}
|
|
|
|
func verify(hash common.Hash, diff *big.Int, nonce uint64) bool {
|
|
sha := sha3.NewKeccak256()
|
|
n := make([]byte, 8)
|
|
binary.PutUvarint(n, nonce)
|
|
sha.Write(n)
|
|
sha.Write(hash[:])
|
|
verification := new(big.Int).Div(common.BigPow(2, 256), diff)
|
|
res := common.BigD(sha.Sum(nil))
|
|
return res.Cmp(verification) <= 0
|
|
}
|
|
|
|
func Verify(block pow.Block) bool {
|
|
return verify(block.HashNoNonce(), block.Difficulty(), block.Nonce())
|
|
}
|
|
|