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package ethminer
import (
"bytes"
"github.com/ethereum/eth-go/ethchain"
"github.com/ethereum/eth-go/ethutil"
"github.com/ethereum/eth-go/ethwire"
"log"
)
type Miner struct {
pow ethchain.PoW
ethereum ethchain.EthManager
coinbase []byte
reactChan chan ethutil.React
txs []*ethchain.Transaction
uncles []*ethchain.Block
block *ethchain.Block
powChan chan []byte
quitChan chan ethutil.React
}
func NewDefaultMiner(coinbase []byte, ethereum ethchain.EthManager) Miner {
reactChan := make(chan ethutil.React, 1) // This is the channel that receives 'updates' when ever a new transaction or block comes in
powChan := make(chan []byte, 1) // This is the channel that receives valid sha hases for a given block
quitChan := make(chan ethutil.React, 1) // This is the channel that can exit the miner thread
ethereum.Reactor().Subscribe("newBlock", reactChan)
ethereum.Reactor().Subscribe("newTx", 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
ethereum.Reactor().Subscribe("newBlock", quitChan)
ethereum.Reactor().Subscribe("newTx", quitChan)
miner := Miner{
pow: ðchain.EasyPow{},
ethereum: ethereum,
coinbase: coinbase,
reactChan: reactChan,
powChan: powChan,
quitChan: quitChan,
}
// Insert initial TXs in our little miner 'pool'
miner.txs = ethereum.TxPool().Flush()
miner.block = ethereum.BlockChain().NewBlock(miner.coinbase, miner.txs)
return miner
}
func (miner *Miner) Start() {
// Prepare inital block
miner.ethereum.StateManager().Prepare(miner.block.State(), miner.block.State())
go func() { miner.listener() }()
}
func (miner *Miner) listener() {
for {
select {
case chanMessage := <-miner.reactChan:
if block, ok := chanMessage.Resource.(*ethchain.Block); ok {
log.Println("[MINER] 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
log.Println("[MINER] 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 {
log.Println("[MINER] Adding uncle block")
miner.uncles = append(miner.uncles, block)
miner.ethereum.StateManager().Prepare(miner.block.State(), miner.block.State())
}
}
}
if tx, ok := chanMessage.Resource.(*ethchain.Transaction); ok {
log.Println("[MINER] Got new transaction from Reactor", tx)
found := false
for _, ctx := range miner.txs {
if found = bytes.Compare(ctx.Hash(), tx.Hash()) == 0; found {
break
}
}
if found == false {
log.Println("[MINER] We did not know about this transaction, adding")
miner.txs = append(miner.txs, tx)
miner.block = miner.ethereum.BlockChain().NewBlock(miner.coinbase, miner.txs)
miner.block.SetTransactions(miner.txs)
} else {
log.Println("[MINER] We already had this transaction, ignoring")
}
}
default:
log.Println("[MINER] Mining on block. Includes", len(miner.txs), "transactions")
// Apply uncles
if len(miner.uncles) > 0 {
miner.block.SetUncles(miner.uncles)
}
// Apply all transactions to the block
miner.ethereum.StateManager().ApplyTransactions(miner.block, miner.block.Transactions())
miner.ethereum.StateManager().AccumelateRewards(miner.block)
// Search the nonce
log.Println("[MINER] Initialision complete, starting mining")
miner.block.Nonce = miner.pow.Search(miner.block, miner.quitChan)
if miner.block.Nonce != nil {
miner.ethereum.StateManager().PrepareDefault(miner.block)
err := miner.ethereum.StateManager().ProcessBlock(miner.block, true)
if err != nil {
log.Println("Error result from process block:", err)
} else {
if !miner.ethereum.StateManager().Pow.Verify(miner.block.HashNoNonce(), miner.block.Difficulty, miner.block.Nonce) {
log.Printf("Second stage verification error: Block's nonce is invalid (= %v)\n", ethutil.Hex(miner.block.Nonce))
}
miner.ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{miner.block.Value().Val})
log.Printf("[MINER] 🔨 Mined block %x\n", miner.block.Hash())
miner.txs = []*ethchain.Transaction{} // Move this somewhere neat
miner.block = miner.ethereum.BlockChain().NewBlock(miner.coinbase, miner.txs)
}
}
}
}
}
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