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() defer func() { pow.HashRate = 0 }() // Make sure stop is empty empty: for { select { case <-stop: default: break empty } } for { select { case <-stop: 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()) }