133 lines
3.1 KiB
Go
133 lines
3.1 KiB
Go
// Copyright 2015 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 miner
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import (
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"sync"
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"sync/atomic"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/pow"
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)
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type CpuAgent struct {
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mu sync.Mutex
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workCh chan *Work
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quit chan struct{}
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quitCurrentOp chan struct{}
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returnCh chan<- *Result
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index int
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pow pow.PoW
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isMining int32 // isMining indicates whether the agent is currently mining
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}
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func NewCpuAgent(index int, pow pow.PoW) *CpuAgent {
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miner := &CpuAgent{
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pow: pow,
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index: index,
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}
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return miner
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}
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func (self *CpuAgent) Work() chan<- *Work { return self.workCh }
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func (self *CpuAgent) Pow() pow.PoW { return self.pow }
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func (self *CpuAgent) SetReturnCh(ch chan<- *Result) { self.returnCh = ch }
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func (self *CpuAgent) Stop() {
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self.mu.Lock()
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defer self.mu.Unlock()
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close(self.quit)
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}
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func (self *CpuAgent) Start() {
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self.mu.Lock()
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defer self.mu.Unlock()
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if !atomic.CompareAndSwapInt32(&self.isMining, 0, 1) {
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return // agent already started
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}
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self.quit = make(chan struct{})
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// creating current op ch makes sure we're not closing a nil ch
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// later on
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self.workCh = make(chan *Work, 1)
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go self.update()
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}
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func (self *CpuAgent) update() {
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out:
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for {
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select {
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case work := <-self.workCh:
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self.mu.Lock()
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if self.quitCurrentOp != nil {
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close(self.quitCurrentOp)
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}
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self.quitCurrentOp = make(chan struct{})
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go self.mine(work, self.quitCurrentOp)
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self.mu.Unlock()
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case <-self.quit:
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self.mu.Lock()
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if self.quitCurrentOp != nil {
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close(self.quitCurrentOp)
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self.quitCurrentOp = nil
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}
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self.mu.Unlock()
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break out
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}
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}
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done:
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// Empty work channel
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for {
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select {
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case <-self.workCh:
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default:
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close(self.workCh)
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break done
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}
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}
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atomic.StoreInt32(&self.isMining, 0)
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}
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func (self *CpuAgent) mine(work *Work, stop <-chan struct{}) {
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glog.V(logger.Debug).Infof("(re)started agent[%d]. mining...\n", self.index)
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// Mine
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nonce, mixDigest := self.pow.Search(work.Block, stop, self.index)
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if nonce != 0 {
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block := work.Block.WithMiningResult(nonce, common.BytesToHash(mixDigest))
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self.returnCh <- &Result{work, block}
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} else {
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self.returnCh <- nil
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}
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}
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func (self *CpuAgent) GetHashRate() int64 {
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return self.pow.GetHashrate()
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}
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