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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package miner
import (
"sync"
"sync/atomic"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/pow"
)
type CpuAgent struct {
mu sync.Mutex
workCh chan *Work
quit chan struct{}
quitCurrentOp chan struct{}
returnCh chan<- *Result
index int
pow pow.PoW
isMining int32 // isMining indicates whether the agent is currently mining
}
func NewCpuAgent(index int, pow pow.PoW) *CpuAgent {
miner := &CpuAgent{
pow: pow,
index: index,
}
return miner
}
func (self *CpuAgent) Work() chan<- *Work { return self.workCh }
func (self *CpuAgent) Pow() pow.PoW { return self.pow }
func (self *CpuAgent) SetReturnCh(ch chan<- *Result) { self.returnCh = ch }
func (self *CpuAgent) Stop() {
self.mu.Lock()
defer self.mu.Unlock()
close(self.quit)
}
func (self *CpuAgent) Start() {
self.mu.Lock()
defer self.mu.Unlock()
if !atomic.CompareAndSwapInt32(&self.isMining, 0, 1) {
return // agent already started
}
self.quit = make(chan struct{})
// creating current op ch makes sure we're not closing a nil ch
// later on
self.workCh = make(chan *Work, 1)
go self.update()
}
func (self *CpuAgent) update() {
out:
for {
select {
case work := <-self.workCh:
self.mu.Lock()
if self.quitCurrentOp != nil {
close(self.quitCurrentOp)
}
self.quitCurrentOp = make(chan struct{})
go self.mine(work, self.quitCurrentOp)
self.mu.Unlock()
case <-self.quit:
self.mu.Lock()
if self.quitCurrentOp != nil {
close(self.quitCurrentOp)
self.quitCurrentOp = nil
}
self.mu.Unlock()
break out
}
}
done:
// Empty work channel
for {
select {
case <-self.workCh:
default:
close(self.workCh)
break done
}
}
atomic.StoreInt32(&self.isMining, 0)
}
func (self *CpuAgent) mine(work *Work, stop <-chan struct{}) {
glog.V(logger.Debug).Infof("(re)started agent[%d]. mining...\n", self.index)
// Mine
nonce, mixDigest := self.pow.Search(work.Block, stop)
if nonce != 0 {
block := work.Block.WithMiningResult(nonce, common.BytesToHash(mixDigest))
self.returnCh <- &Result{work, block}
} else {
self.returnCh <- nil
}
}
func (self *CpuAgent) GetHashRate() int64 {
return self.pow.GetHashrate()
}
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