116 lines
2.6 KiB
Go
116 lines
2.6 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package ezp
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import (
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"encoding/binary"
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"math/big"
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"math/rand"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto/sha3"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/pow"
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)
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var powlogger = logger.NewLogger("POW")
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type EasyPow struct {
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hash *big.Int
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HashRate int64
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turbo bool
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}
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func New() *EasyPow {
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return &EasyPow{turbo: false}
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}
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func (pow *EasyPow) GetHashrate() int64 {
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return pow.HashRate
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}
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func (pow *EasyPow) Turbo(on bool) {
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pow.turbo = on
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}
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func (pow *EasyPow) Search(block pow.Block, stop <-chan struct{}) (uint64, []byte) {
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r := rand.New(rand.NewSource(time.Now().UnixNano()))
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hash := block.HashNoNonce()
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diff := block.Difficulty()
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//i := int64(0)
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// TODO fix offset
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i := rand.Int63()
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starti := i
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start := time.Now().UnixNano()
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defer func() { pow.HashRate = 0 }()
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// Make sure stop is empty
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empty:
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for {
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select {
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case <-stop:
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default:
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break empty
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}
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}
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for {
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select {
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case <-stop:
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return 0, nil
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default:
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i++
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elapsed := time.Now().UnixNano() - start
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hashes := ((float64(1e9) / float64(elapsed)) * float64(i-starti)) / 1000
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pow.HashRate = int64(hashes)
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sha := uint64(r.Int63())
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if verify(hash, diff, sha) {
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return sha, nil
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}
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}
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if !pow.turbo {
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time.Sleep(20 * time.Microsecond)
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}
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}
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return 0, nil
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}
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func (pow *EasyPow) Verify(block pow.Block) bool {
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return Verify(block)
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}
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func verify(hash common.Hash, diff *big.Int, nonce uint64) bool {
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sha := sha3.NewKeccak256()
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n := make([]byte, 8)
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binary.PutUvarint(n, nonce)
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sha.Write(n)
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sha.Write(hash[:])
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verification := new(big.Int).Div(common.BigPow(2, 256), diff)
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res := common.BigD(sha.Sum(nil))
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return res.Cmp(verification) <= 0
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}
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func Verify(block pow.Block) bool {
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return verify(block.HashNoNonce(), block.Difficulty(), block.Nonce())
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}
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