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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/consensus"
"github.com/ethereum/go-ethereum/log"
)
type CpuAgent struct {
mu sync.Mutex
workCh chan *Work
stop chan struct{}
quitCurrentOp chan struct{}
returnCh chan<- *Result
chain consensus.ChainReader
engine consensus.Engine
started int32 // started indicates whether the agent is currently started
}
func NewCpuAgent(chain consensus.ChainReader, engine consensus.Engine) *CpuAgent {
agent := &CpuAgent{
chain: chain,
engine: engine,
stop: make(chan struct{}, 1),
workCh: make(chan *Work, 1),
}
return agent
}
func (self *CpuAgent) Work() chan<- *Work { return self.workCh }
func (self *CpuAgent) SetReturnCh(ch chan<- *Result) { self.returnCh = ch }
func (self *CpuAgent) Start() {
if !atomic.CompareAndSwapInt32(&self.started, 0, 1) {
return // agent already started
}
go self.update()
}
func (self *CpuAgent) Stop() {
if !atomic.CompareAndSwapInt32(&self.started, 1, 0) {
return // agent already stopped
}
self.stop <- struct{}{}
done:
// Empty work channel
for {
select {
case <-self.workCh:
default:
break done
}
}
}
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.stop:
self.mu.Lock()
if self.quitCurrentOp != nil {
close(self.quitCurrentOp)
self.quitCurrentOp = nil
}
self.mu.Unlock()
break out
}
}
}
func (self *CpuAgent) mine(work *Work, stop <-chan struct{}) {
if result, err := self.engine.Seal(self.chain, work.Block, stop); result != nil {
log.Info("Successfully sealed new block", "number", result.Number(), "hash", result.Hash())
self.returnCh <- &Result{work, result}
} else {
if err != nil {
log.Warn("Block sealing failed", "err", err)
}
self.returnCh <- nil
}
}
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