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path: root/miner/miner.go
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package miner

import (
    "math/big"
    "sort"

    "github.com/ethereum/go-ethereum"
    "github.com/ethereum/go-ethereum/ethutil"

    "github.com/ethereum/go-ethereum/chain"
    "github.com/ethereum/go-ethereum/event"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/wire"
)

type LocalTx struct {
    To       []byte `json:"to"`
    Data     []byte `json:"data"`
    Gas      string `json:"gas"`
    GasPrice string `json:"gasPrice"`
    Value    string `json:"value"`
}

func (self *LocalTx) Sign(key []byte) *chain.Transaction {
    return nil
}

var minerlogger = logger.NewLogger("MINER")

type Miner struct {
    eth    *eth.Ethereum
    events event.Subscription

    uncles    chain.Blocks
    localTxs  map[int]*LocalTx
    localTxId int

    pow       chain.PoW
    quitCh    chan struct{}
    powQuitCh chan struct{}

    Coinbase []byte

    mining bool

    MinAcceptedGasPrice *big.Int
}

func New(coinbase []byte, eth *eth.Ethereum) *Miner {
    return &Miner{
        eth:                 eth,
        powQuitCh:           make(chan struct{}),
        pow:                 &chain.EasyPow{},
        mining:              false,
        localTxs:            make(map[int]*LocalTx),
        MinAcceptedGasPrice: big.NewInt(10000000000000),
        Coinbase:            coinbase,
    }
}

func (self *Miner) GetPow() chain.PoW {
    return self.pow
}

func (self *Miner) AddLocalTx(tx *LocalTx) int {
    minerlogger.Infof("Added local tx (%x %v / %v)\n", tx.To[0:4], tx.GasPrice, tx.Value)

    self.localTxId++
    self.localTxs[self.localTxId] = tx
    self.eth.EventMux().Post(tx)

    return self.localTxId
}

func (self *Miner) RemoveLocalTx(id int) {
    if tx := self.localTxs[id]; tx != nil {
        minerlogger.Infof("Removed local tx (%x %v / %v)\n", tx.To[0:4], tx.GasPrice, tx.Value)
    }
    self.eth.EventMux().Post(&LocalTx{})

    delete(self.localTxs, id)
}

func (self *Miner) Start() {
    if self.mining {
        return
    }

    minerlogger.Infoln("Starting mining operations")
    self.mining = true
    self.quitCh = make(chan struct{})
    self.powQuitCh = make(chan struct{})

    mux := self.eth.EventMux()
    self.events = mux.Subscribe(chain.NewBlockEvent{}, chain.TxPreEvent{}, &LocalTx{})

    go self.update()
    go self.mine()
}

func (self *Miner) Stop() {
    if !self.mining {
        return
    }

    self.mining = false

    minerlogger.Infoln("Stopping mining operations")

    self.events.Unsubscribe()

    close(self.quitCh)
    close(self.powQuitCh)
}

func (self *Miner) Mining() bool {
    return self.mining
}

func (self *Miner) update() {
out:
    for {
        select {
        case event := <-self.events.Chan():
            switch event := event.(type) {
            case chain.NewBlockEvent:
                block := event.Block
                if self.eth.ChainManager().HasBlock(block.Hash()) {
                    self.reset()
                    self.eth.TxPool().RemoveSet(block.Transactions())
                    go self.mine()
                } else if true {
                    // do uncle stuff
                }
            case chain.TxPreEvent, *LocalTx:
                self.reset()
                go self.mine()
            }
        case <-self.quitCh:
            break out
        }
    }
}

func (self *Miner) reset() {
    println("reset")
    close(self.powQuitCh)
    self.powQuitCh = make(chan struct{})
}

func (self *Miner) mine() {
    var (
        blockManager = self.eth.BlockManager()
        chainMan     = self.eth.ChainManager()
        block        = chainMan.NewBlock(self.Coinbase)
    )
    block.MinGasPrice = self.MinAcceptedGasPrice

    // Apply uncles
    if len(self.uncles) > 0 {
        block.SetUncles(self.uncles)
    }

    parent := chainMan.GetBlock(block.PrevHash)
    coinbase := block.State().GetOrNewStateObject(block.Coinbase)
    coinbase.SetGasPool(block.CalcGasLimit(parent))

    transactions := self.finiliseTxs()

    // Accumulate all valid transactions and apply them to the new state
    // Error may be ignored. It's not important during mining
    receipts, txs, _, erroneous, err := blockManager.ProcessTransactions(coinbase, block.State(), block, block, transactions)
    if err != nil {
        minerlogger.Debugln(err)
    }
    self.eth.TxPool().RemoveSet(erroneous)

    block.SetTransactions(txs)
    block.SetReceipts(receipts)

    // Accumulate the rewards included for this block
    blockManager.AccumelateRewards(block.State(), block, parent)

    block.State().Update()

    minerlogger.Infof("Mining on block. Includes %v transactions", len(transactions))

    // Find a valid nonce
    nonce := self.pow.Search(block, self.powQuitCh)
    if nonce != nil {
        block.Nonce = nonce
        lchain := chain.NewChain(chain.Blocks{block})
        _, err := chainMan.TestChain(lchain, true)
        if err != nil {
            minerlogger.Infoln(err)
        } else {
            //chainMan.InsertChain(lchain)
            self.eth.EventMux().Post(chain.NewBlockEvent{block})
            self.eth.Broadcast(wire.MsgBlockTy, []interface{}{block.Value().Val})

            minerlogger.Infof("🔨  Mined block %x\n", block.Hash())
            minerlogger.Infoln(block)
        }

        go self.mine()
    }
}

func (self *Miner) finiliseTxs() chain.Transactions {
    // Sort the transactions by nonce in case of odd network propagation
    var txs chain.Transactions

    state := self.eth.BlockManager().TransState()
    // XXX This has to change. Coinbase is, for new, same as key.
    key := self.eth.KeyManager()
    for _, ltx := range self.localTxs {
        tx := chain.NewTransactionMessage(ltx.To, ethutil.Big(ltx.Value), ethutil.Big(ltx.Gas), ethutil.Big(ltx.GasPrice), ltx.Data)
        tx.Nonce = state.GetNonce(self.Coinbase)
        state.SetNonce(self.Coinbase, tx.Nonce+1)

        tx.Sign(key.PrivateKey())

        txs = append(txs, tx)
    }

    txs = append(txs, self.eth.TxPool().CurrentTransactions()...)
    sort.Sort(chain.TxByNonce{txs})

    return txs
}