path: root/miner/agent.go

package miner

import (
    "sync"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/logger/glog"
    "github.com/ethereum/go-ethereum/pow"
)

type CpuAgent struct {
    chMu          sync.Mutex
    c             chan *types.Block
    quit          chan struct{}
    quitCurrentOp chan struct{}
    returnCh      chan<- *types.Block

    index int
    pow   pow.PoW
}

func NewCpuAgent(index int, pow pow.PoW) *CpuAgent {
    miner := &CpuAgent{
        pow:   pow,
        index: index,
    }

    return miner
}

func (self *CpuAgent) Work() chan<- *types.Block          { return self.c }
func (self *CpuAgent) Pow() pow.PoW                       { return self.pow }
func (self *CpuAgent) SetReturnCh(ch chan<- *types.Block) { self.returnCh = ch }

func (self *CpuAgent) Stop() {
    close(self.quit)
    close(self.quitCurrentOp)
}

func (self *CpuAgent) Start() {
    self.quit = make(chan struct{})
    self.quitCurrentOp = make(chan struct{}, 1)
    self.c = make(chan *types.Block, 1)

    go self.update()
}

func (self *CpuAgent) update() {
out:
    for {
        select {
        case block := <-self.c:
            self.chMu.Lock()
            self.quitCurrentOp <- struct{}{}
            self.chMu.Unlock()

            go self.mine(block)
        case <-self.quit:
            break out
        }
    }

    //close(self.quitCurrentOp)
done:
    // Empty channel
    for {
        select {
        case <-self.c:
        default:
            close(self.c)

            break done
        }
    }
}

func (self *CpuAgent) mine(block *types.Block) {
    glog.V(logger.Debug).Infof("(re)started agent[%d]. mining...\n", self.index)

    // Reset the channel
    self.chMu.Lock()
    self.quitCurrentOp = make(chan struct{}, 1)
    self.chMu.Unlock()

    // Mine
    nonce, mixDigest := self.pow.Search(block, self.quitCurrentOp)
    if nonce != 0 {
        block.SetNonce(nonce)
        block.Header().MixDigest = common.BytesToHash(mixDigest)
        self.returnCh <- block
    } else {
        self.returnCh <- nil
    }
}

func (self *CpuAgent) GetHashRate() int64 {
    return self.pow.GetHashrate()
}