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package ethminer
import (
"bytes"
"sort"
"github.com/ethereum/eth-go/ethchain"
"github.com/ethereum/eth-go/ethlog"
"github.com/ethereum/eth-go/ethreact"
"github.com/ethereum/eth-go/ethwire"
)
var logger = ethlog.NewLogger("MINER")
type Miner struct {
pow ethchain.PoW
ethereum ethchain.EthManager
coinbase []byte
reactChan chan ethreact.Event
txs ethchain.Transactions
uncles []*ethchain.Block
block *ethchain.Block
powChan chan []byte
powQuitChan chan ethreact.Event
quitChan chan chan error
}
func (self *Miner) GetPow() ethchain.PoW {
return self.pow
}
func NewDefaultMiner(coinbase []byte, ethereum ethchain.EthManager) *Miner {
miner := Miner{
pow: ðchain.EasyPow{},
ethereum: ethereum,
coinbase: coinbase,
}
return &miner
}
func (miner *Miner) Start() {
miner.reactChan = make(chan ethreact.Event, 1) // This is the channel that receives 'updates' when ever a new transaction or block comes in
miner.powChan = make(chan []byte, 1) // This is the channel that receives valid sha hashes for a given block
miner.powQuitChan = make(chan ethreact.Event, 1) // This is the channel that can exit the miner thread
miner.quitChan = make(chan chan error, 1)
// Insert initial TXs in our little miner 'pool'
miner.txs = miner.ethereum.TxPool().Flush()
miner.block = miner.ethereum.BlockChain().NewBlock(miner.coinbase)
// Prepare inital block
//miner.ethereum.StateManager().Prepare(miner.block.State(), miner.block.State())
go miner.listener()
reactor := miner.ethereum.Reactor()
reactor.Subscribe("newBlock", miner.reactChan)
reactor.Subscribe("newTx:pre", miner.reactChan)
// We need the quit chan to be a Reactor event.
// The POW search method is actually blocking and if we don't
// listen to the reactor events inside of the pow itself
// The miner overseer will never get the reactor events themselves
// Only after the miner will find the sha
reactor.Subscribe("newBlock", miner.powQuitChan)
reactor.Subscribe("newTx:pre", miner.powQuitChan)
logger.Infoln("Started")
reactor.Post("miner:start", miner)
}
func (miner *Miner) listener() {
for {
select {
case status := <-miner.quitChan:
logger.Infoln("Stopped")
status <- nil
return
case chanMessage := <-miner.reactChan:
if block, ok := chanMessage.Resource.(*ethchain.Block); ok {
//logger.Infoln("Got new block via Reactor")
if bytes.Compare(miner.ethereum.BlockChain().CurrentBlock.Hash(), block.Hash()) == 0 {
// TODO: Perhaps continue mining to get some uncle rewards
//logger.Infoln("New top block found resetting state")
// Filter out which Transactions we have that were not in this block
var newtxs []*ethchain.Transaction
for _, tx := range miner.txs {
found := false
for _, othertx := range block.Transactions() {
if bytes.Compare(tx.Hash(), othertx.Hash()) == 0 {
found = true
}
}
if found == false {
newtxs = append(newtxs, tx)
}
}
miner.txs = newtxs
// Setup a fresh state to mine on
//miner.block = miner.ethereum.BlockChain().NewBlock(miner.coinbase, miner.txs)
} else {
if bytes.Compare(block.PrevHash, miner.ethereum.BlockChain().CurrentBlock.PrevHash) == 0 {
logger.Infoln("Adding uncle block")
miner.uncles = append(miner.uncles, block)
}
}
}
if tx, ok := chanMessage.Resource.(*ethchain.Transaction); ok {
found := false
for _, ctx := range miner.txs {
if found = bytes.Compare(ctx.Hash(), tx.Hash()) == 0; found {
break
}
}
if found == false {
// Undo all previous commits
miner.block.Undo()
// Apply new transactions
miner.txs = append(miner.txs, tx)
}
}
default:
miner.mineNewBlock()
}
}
}
func (miner *Miner) Stop() {
logger.Infoln("Stopping...")
miner.powQuitChan <- ethreact.Event{}
status := make(chan error)
miner.quitChan <- status
<-status
reactor := miner.ethereum.Reactor()
reactor.Unsubscribe("newBlock", miner.powQuitChan)
reactor.Unsubscribe("newTx:pre", miner.powQuitChan)
reactor.Unsubscribe("newBlock", miner.reactChan)
reactor.Unsubscribe("newTx:pre", miner.reactChan)
reactor.Post("miner:stop", miner)
}
func (self *Miner) mineNewBlock() {
stateManager := self.ethereum.StateManager()
self.block = self.ethereum.BlockChain().NewBlock(self.coinbase)
// Apply uncles
if len(self.uncles) > 0 {
self.block.SetUncles(self.uncles)
}
// Sort the transactions by nonce in case of odd network propagation
sort.Sort(ethchain.TxByNonce{self.txs})
// Accumulate all valid transactions and apply them to the new state
// Error may be ignored. It's not important during mining
parent := self.ethereum.BlockChain().GetBlock(self.block.PrevHash)
coinbase := self.block.State().GetOrNewStateObject(self.block.Coinbase)
coinbase.SetGasPool(self.block.CalcGasLimit(parent))
receipts, txs, unhandledTxs, err := stateManager.ProcessTransactions(coinbase, self.block.State(), self.block, self.block, self.txs)
if err != nil {
logger.Debugln(err)
}
self.txs = append(txs, unhandledTxs...)
self.block.SetTxHash(receipts)
// Set the transactions to the block so the new SHA3 can be calculated
self.block.SetReceipts(receipts, txs)
// Accumulate the rewards included for this block
stateManager.AccumelateRewards(self.block.State(), self.block)
self.block.State().Update()
logger.Infof("Mining on block. Includes %v transactions", len(self.txs))
// Find a valid nonce
self.block.Nonce = self.pow.Search(self.block, self.powQuitChan)
if self.block.Nonce != nil {
err := self.ethereum.StateManager().Process(self.block, false)
if err != nil {
logger.Infoln(err)
} else {
self.ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{self.block.Value().Val})
logger.Infof("🔨 Mined block %x\n", self.block.Hash())
logger.Infoln(self.block)
// Gather the new batch of transactions currently in the tx pool
self.txs = self.ethereum.TxPool().CurrentTransactions()
}
}
}
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