github.com/ethereumproject/go-ethereum@v5.5.2+incompatible/miner/agent.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package miner
    18  
    19  import (
    20  	"sync"
    21  
    22  	"sync/atomic"
    23  
    24  	"github.com/ethereumproject/go-ethereum/common"
    25  	"github.com/ethereumproject/go-ethereum/logger"
    26  	"github.com/ethereumproject/go-ethereum/logger/glog"
    27  	"github.com/ethereumproject/go-ethereum/pow"
    28  )
    29  
    30  type CpuAgent struct {
    31  	mu sync.Mutex
    32  
    33  	workCh        chan *Work
    34  	quit          chan struct{}
    35  	quitCurrentOp chan struct{}
    36  	returnCh      chan<- *Result
    37  
    38  	index int
    39  	pow   pow.PoW
    40  
    41  	isMining int32 // isMining indicates whether the agent is currently mining
    42  }
    43  
    44  func NewCpuAgent(index int, pow pow.PoW) *CpuAgent {
    45  	miner := &CpuAgent{
    46  		pow:   pow,
    47  		index: index,
    48  	}
    49  
    50  	return miner
    51  }
    52  
    53  func (self *CpuAgent) Work() chan<- *Work            { return self.workCh }
    54  func (self *CpuAgent) Pow() pow.PoW                  { return self.pow }
    55  func (self *CpuAgent) SetReturnCh(ch chan<- *Result) { self.returnCh = ch }
    56  
    57  func (self *CpuAgent) Stop() {
    58  	self.mu.Lock()
    59  	defer self.mu.Unlock()
    60  
    61  	close(self.quit)
    62  }
    63  
    64  func (self *CpuAgent) Start() {
    65  	self.mu.Lock()
    66  	defer self.mu.Unlock()
    67  
    68  	if !atomic.CompareAndSwapInt32(&self.isMining, 0, 1) {
    69  		return // agent already started
    70  	}
    71  
    72  	self.quit = make(chan struct{})
    73  	// creating current op ch makes sure we're not closing a nil ch
    74  	// later on
    75  	self.workCh = make(chan *Work, 1)
    76  
    77  	go self.update()
    78  }
    79  
    80  func (self *CpuAgent) update() {
    81  out:
    82  	for {
    83  		select {
    84  		case work := <-self.workCh:
    85  			self.mu.Lock()
    86  			if self.quitCurrentOp != nil {
    87  				close(self.quitCurrentOp)
    88  			}
    89  			self.quitCurrentOp = make(chan struct{})
    90  			go self.mine(work, self.quitCurrentOp)
    91  			self.mu.Unlock()
    92  		case <-self.quit:
    93  			self.mu.Lock()
    94  			if self.quitCurrentOp != nil {
    95  				close(self.quitCurrentOp)
    96  				self.quitCurrentOp = nil
    97  			}
    98  			self.mu.Unlock()
    99  			break out
   100  		}
   101  	}
   102  
   103  done:
   104  	// Empty work channel
   105  	for {
   106  		select {
   107  		case <-self.workCh:
   108  		default:
   109  			close(self.workCh)
   110  			break done
   111  		}
   112  	}
   113  
   114  	atomic.StoreInt32(&self.isMining, 0)
   115  }
   116  
   117  func (self *CpuAgent) mine(work *Work, stop <-chan struct{}) {
   118  	glog.V(logger.Debug).Infof("(re)started agent[%d]. mining...\n", self.index)
   119  
   120  	// Mine
   121  	nonce, mixDigest := self.pow.Search(work.Block, stop, self.index)
   122  	if nonce != 0 {
   123  		block := work.Block.WithMiningResult(nonce, common.BytesToHash(mixDigest))
   124  		self.returnCh <- &Result{work, block}
   125  	} else {
   126  		self.returnCh <- nil
   127  	}
   128  }
   129  
   130  func (self *CpuAgent) GetHashRate() int64 {
   131  	return self.pow.GetHashrate()
   132  }