path: root/miner/agent.go

package miner

import (
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/pow"
)

type CpuMiner struct {
    c             chan *types.Block
    quit          chan struct{}
    quitCurrentOp chan struct{}
    returnCh      chan<- Work

    index int
    pow   pow.PoW
}

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

    return miner
}

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

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

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

    go self.update()
}

func (self *CpuMiner) update() {
    justStarted := true
out:
    for {
        select {
        case block := <-self.c:
            if justStarted {
                justStarted = true
            } else {
                self.quitCurrentOp <- struct{}{}
            }

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

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

            break done
        }
    }
}

func (self *CpuMiner) mine(block *types.Block) {
    minerlogger.Infof("(re)started agent[%d]. mining...\n", self.index)
    nonce, mixDigest, seedHash := self.pow.Search(block, self.quitCurrentOp)
    if nonce != 0 {
        self.returnCh <- Work{block.Number().Uint64(), nonce, mixDigest, seedHash}
    }
}