forked from cerc-io/plugeth
137 lines
3.1 KiB
Go
137 lines
3.1 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package miner
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import (
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"math/big"
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"sync"
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"time"
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"github.com/ethereum/ethash"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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type RemoteAgent struct {
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mu sync.Mutex
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quit chan struct{}
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workCh chan *Work
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returnCh chan<- *Result
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currentWork *Work
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work map[common.Hash]*Work
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}
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func NewRemoteAgent() *RemoteAgent {
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agent := &RemoteAgent{work: make(map[common.Hash]*Work)}
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return agent
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}
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func (a *RemoteAgent) Work() chan<- *Work {
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return a.workCh
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}
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func (a *RemoteAgent) SetReturnCh(returnCh chan<- *Result) {
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a.returnCh = returnCh
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}
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func (a *RemoteAgent) Start() {
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a.quit = make(chan struct{})
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a.workCh = make(chan *Work, 1)
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go a.maintainLoop()
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}
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func (a *RemoteAgent) Stop() {
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close(a.quit)
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close(a.workCh)
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}
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func (a *RemoteAgent) GetHashRate() int64 { return 0 }
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func (a *RemoteAgent) GetWork() [3]string {
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a.mu.Lock()
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defer a.mu.Unlock()
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var res [3]string
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if a.currentWork != nil {
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block := a.currentWork.Block
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res[0] = block.HashNoNonce().Hex()
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seedHash, _ := ethash.GetSeedHash(block.NumberU64())
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res[1] = common.BytesToHash(seedHash).Hex()
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// Calculate the "target" to be returned to the external miner
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n := big.NewInt(1)
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n.Lsh(n, 255)
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n.Div(n, block.Difficulty())
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n.Lsh(n, 1)
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res[2] = common.BytesToHash(n.Bytes()).Hex()
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a.work[block.HashNoNonce()] = a.currentWork
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}
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return res
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}
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// Returns true or false, but does not indicate if the PoW was correct
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func (a *RemoteAgent) SubmitWork(nonce uint64, mixDigest, hash common.Hash) bool {
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a.mu.Lock()
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defer a.mu.Unlock()
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// Make sure the work submitted is present
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if a.work[hash] != nil {
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block := a.work[hash].Block.WithMiningResult(nonce, mixDigest)
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a.returnCh <- &Result{a.work[hash], block}
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delete(a.work, hash)
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return true
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} else {
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glog.V(logger.Info).Infof("Work was submitted for %x but no pending work found\n", hash)
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}
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return false
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}
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func (a *RemoteAgent) maintainLoop() {
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ticker := time.Tick(5 * time.Second)
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out:
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for {
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select {
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case <-a.quit:
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break out
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case work := <-a.workCh:
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a.mu.Lock()
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a.currentWork = work
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a.mu.Unlock()
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case <-ticker:
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// cleanup
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a.mu.Lock()
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for hash, work := range a.work {
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if time.Since(work.createdAt) > 7*(12*time.Second) {
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delete(a.work, hash)
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}
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}
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a.mu.Unlock()
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}
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}
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}
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