100 lines
1.8 KiB
Go
100 lines
1.8 KiB
Go
package ezp
|
|
|
|
import (
|
|
"math/big"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
"github.com/ethereum/go-ethereum/crypto/sha3"
|
|
"github.com/ethereum/go-ethereum/ethutil"
|
|
"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: true}
|
|
}
|
|
|
|
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{}) []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()
|
|
|
|
// Make sure stop is empty
|
|
empty:
|
|
for {
|
|
select {
|
|
case <-stop:
|
|
default:
|
|
break empty
|
|
}
|
|
}
|
|
|
|
for {
|
|
select {
|
|
case <-stop:
|
|
pow.HashRate = 0
|
|
return nil
|
|
default:
|
|
i++
|
|
|
|
elapsed := time.Now().UnixNano() - start
|
|
hashes := ((float64(1e9) / float64(elapsed)) * float64(i-starti)) / 1000
|
|
pow.HashRate = int64(hashes)
|
|
|
|
sha := crypto.Sha3(big.NewInt(r.Int63()).Bytes())
|
|
if verify(hash, diff, sha) {
|
|
return sha
|
|
}
|
|
}
|
|
|
|
if !pow.turbo {
|
|
time.Sleep(20 * time.Microsecond)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (pow *EasyPow) Verify(block pow.Block) bool {
|
|
return Verify(block)
|
|
}
|
|
|
|
func verify(hash []byte, diff *big.Int, nonce []byte) bool {
|
|
sha := sha3.NewKeccak256()
|
|
|
|
d := append(hash, nonce...)
|
|
sha.Write(d)
|
|
|
|
verification := new(big.Int).Div(ethutil.BigPow(2, 256), diff)
|
|
res := ethutil.BigD(sha.Sum(nil))
|
|
|
|
return res.Cmp(verification) <= 0
|
|
}
|
|
|
|
func Verify(block pow.Block) bool {
|
|
return verify(block.HashNoNonce(), block.Difficulty(), block.N())
|
|
}
|