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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library 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.
//
// The go-ethereum library 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 the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package miner
import (
"errors"
"math/big"
"sync"
"sync/atomic"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
)
type hashrate struct {
ping time.Time
rate uint64
}
type RemoteAgent struct {
mu sync.Mutex
quitCh chan struct{}
workCh chan *Work
returnCh chan<- *Result
chain consensus.ChainReader
engine consensus.Engine
currentWork *Work
work map[common.Hash]*Work
hashrateMu sync.RWMutex
hashrate map[common.Hash]hashrate
running int32 // running indicates whether the agent is active. Call atomically
}
func NewRemoteAgent(chain consensus.ChainReader, engine consensus.Engine) *RemoteAgent {
return &RemoteAgent{
chain: chain,
engine: engine,
work: make(map[common.Hash]*Work),
hashrate: make(map[common.Hash]hashrate),
}
}
func (a *RemoteAgent) SubmitHashrate(id common.Hash, rate uint64) {
a.hashrateMu.Lock()
defer a.hashrateMu.Unlock()
a.hashrate[id] = hashrate{time.Now(), rate}
}
func (a *RemoteAgent) Work() chan<- *Work {
return a.workCh
}
func (a *RemoteAgent) SetReturnCh(returnCh chan<- *Result) {
a.returnCh = returnCh
}
func (a *RemoteAgent) Start() {
if !atomic.CompareAndSwapInt32(&a.running, 0, 1) {
return
}
a.quitCh = make(chan struct{})
a.workCh = make(chan *Work, 1)
go a.loop(a.workCh, a.quitCh)
}
func (a *RemoteAgent) Stop() {
if !atomic.CompareAndSwapInt32(&a.running, 1, 0) {
return
}
close(a.quitCh)
close(a.workCh)
}
// GetHashRate returns the accumulated hashrate of all identifier combined
func (a *RemoteAgent) GetHashRate() (tot int64) {
a.hashrateMu.RLock()
defer a.hashrateMu.RUnlock()
// this could overflow
for _, hashrate := range a.hashrate {
tot += int64(hashrate.rate)
}
return
}
func (a *RemoteAgent) GetWork() ([3]string, error) {
a.mu.Lock()
defer a.mu.Unlock()
var res [3]string
if a.currentWork != nil {
block := a.currentWork.Block
res[0] = block.HashNoNonce().Hex()
seedHash := ethash.SeedHash(block.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, block.Difficulty())
n.Lsh(n, 1)
res[2] = common.BytesToHash(n.Bytes()).Hex()
a.work[block.HashNoNonce()] = a.currentWork
return res, nil
}
return res, errors.New("No work available yet, don't panic.")
}
// SubmitWork tries to inject a pow solution into the remote agent, returning
// whether the solution was accepted or not (not can be both a bad pow as well as
// any other error, like no work pending).
func (a *RemoteAgent) SubmitWork(nonce types.BlockNonce, mixDigest, hash common.Hash) bool {
a.mu.Lock()
defer a.mu.Unlock()
// Make sure the work submitted is present
work := a.work[hash]
if work == nil {
log.Info("Work submitted but none pending", "hash", hash)
return false
}
// Make sure the Engine solutions is indeed valid
result := work.Block.Header()
result.Nonce = nonce
result.MixDigest = mixDigest
if err := a.engine.VerifySeal(a.chain, result); err != nil {
log.Warn("Invalid proof-of-work submitted", "hash", hash, "err", err)
return false
}
block := work.Block.WithSeal(result)
// Solutions seems to be valid, return to the miner and notify acceptance
a.returnCh <- &Result{work, block}
delete(a.work, hash)
return true
}
// loop monitors mining events on the work and quit channels, updating the internal
// state of the remote miner until a termination is requested.
//
// Note, the reason the work and quit channels are passed as parameters is because
// RemoteAgent.Start() constantly recreates these channels, so the loop code cannot
// assume data stability in these member fields.
func (a *RemoteAgent) loop(workCh chan *Work, quitCh chan struct{}) {
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for {
select {
case <-quitCh:
return
case work := <-workCh:
a.mu.Lock()
a.currentWork = work
a.mu.Unlock()
case <-ticker.C:
// cleanup
a.mu.Lock()
for hash, work := range a.work {
if time.Since(work.createdAt) > 7*(12*time.Second) {
delete(a.work, hash)
}
}
a.mu.Unlock()
a.hashrateMu.Lock()
for id, hashrate := range a.hashrate {
if time.Since(hashrate.ping) > 10*time.Second {
delete(a.hashrate, id)
}
}
a.hashrateMu.Unlock()
}
}
}
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