package ezp import ( "math/big" "math/rand" "time" "github.com/ethereum/go-ethereum/crypto" "github.com/ethereum/go-ethereum/ethutil" "github.com/ethereum/go-ethereum/logger" "github.com/ethereum/go-ethereum/pow" "github.com/obscuren/sha3" ) 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{}) []byte { r := rand.New(rand.NewSource(time.Now().UnixNano())) hash := block.HashNoNonce() diff := block.Difficulty() i := int64(0) start := time.Now().UnixNano() t := time.Now() for { select { case <-stop: powlogger.Infoln("Breaking from mining") pow.HashRate = 0 return nil default: i++ if time.Since(t) > (1 * time.Second) { elapsed := time.Now().UnixNano() - start hashes := ((float64(1e9) / float64(elapsed)) * float64(i)) / 1000 pow.HashRate = int64(hashes) powlogger.Infoln("Hashing @", pow.HashRate, "khash") t = time.Now() } 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.U256(ethutil.BigD(sha.Sum(nil))) return res.Cmp(verification) <= 0 } func Verify(block pow.Block) bool { return verify(block.HashNoNonce(), block.Difficulty(), block.N()) }