path: root/miner/remote_agent.go

// Copyright 2015 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum 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.
//
// go-ethereum 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 go-ethereum.  If not, see <http://www.gnu.org/licenses/>.

package miner

import (
    "math/big"

    "github.com/ethereum/ethash"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
)

type RemoteAgent struct {
    work        *types.Block
    currentWork *types.Block

    quit     chan struct{}
    workCh   chan *types.Block
    returnCh chan<- *types.Block
}

func NewRemoteAgent() *RemoteAgent {
    agent := &RemoteAgent{}

    return agent
}

func (a *RemoteAgent) Work() chan<- *types.Block {
    return a.workCh
}

func (a *RemoteAgent) SetReturnCh(returnCh chan<- *types.Block) {
    a.returnCh = returnCh
}

func (a *RemoteAgent) Start() {
    a.quit = make(chan struct{})
    a.workCh = make(chan *types.Block, 1)
    go a.run()
}

func (a *RemoteAgent) Stop() {
    close(a.quit)
    close(a.workCh)
}

func (a *RemoteAgent) GetHashRate() int64 { return 0 }

func (a *RemoteAgent) run() {
out:
    for {
        select {
        case <-a.quit:
            break out
        case work := <-a.workCh:
            a.work = work
        }
    }
}

func (a *RemoteAgent) GetWork() [3]string {
    var res [3]string

    if a.work != nil {
        a.currentWork = a.work

        res[0] = a.work.HashNoNonce().Hex()
        seedHash, _ := ethash.GetSeedHash(a.currentWork.NumberU64())
        res[1] = common.BytesToHash(seedHash).Hex()
        // Calculate the "target" to be returned to the external miner
        n := big.NewInt(1)
        n.Lsh(n, 255)
        n.Div(n, a.work.Difficulty())
        n.Lsh(n, 1)
        res[2] = common.BytesToHash(n.Bytes()).Hex()
    }

    return res
}

func (a *RemoteAgent) SubmitWork(nonce uint64, mixDigest, seedHash common.Hash) bool {
    // Return true or false, but does not indicate if the PoW was correct

    // Make sure the external miner was working on the right hash
    if a.currentWork != nil && a.work != nil {
        a.returnCh <- a.currentWork.WithMiningResult(nonce, mixDigest)
        //a.returnCh <- Work{a.currentWork.Number().Uint64(), nonce, mixDigest.Bytes(), seedHash.Bytes()}
        return true
    }

    return false
}