package miner
import (
"fmt"
"math/big"
"sort"
"sync"
"sync/atomic"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/pow"
"gopkg.in/fatih/set.v0"
)
var jsonlogger = logger.NewJsonLogger()
// Work holds the current work
type Work struct {
Number uint64
Nonce uint64
MixDigest []byte
SeedHash []byte
}
// Agent can register themself with the worker
type Agent interface {
Work() chan<- *types.Block
SetReturnCh(chan<- *types.Block)
Stop()
Start()
GetHashRate() int64
}
// environment is the workers current environment and holds
// all of the current state information
type environment struct {
totalUsedGas *big.Int // total gas usage in the cycle
state *state.StateDB // apply state changes here
coinbase *state.StateObject // the miner's account
block *types.Block // the new block
ancestors *set.Set // ancestor set (used for checking uncle parent validity)
family *set.Set // family set (used for checking uncle invalidity)
uncles *set.Set // uncle set
remove *set.Set // tx which will be removed
tcount int // tx count in cycle
ignoredTransactors *set.Set
lowGasTransactors *set.Set
ownedAccounts *set.Set
lowGasTxs types.Transactions
}
// env returns a new environment for the current cycle
func env(block *types.Block, eth core.Backend) *environment {
state := state.New(block.Root(), eth.StateDb())
env := &environment{
totalUsedGas: new(big.Int),
state: state,
block: block,
ancestors: set.New(),
family: set.New(),
uncles: set.New(),
coinbase: state.GetOrNewStateObject(block.Coinbase()),
}
return env
}
// worker is the main object which takes care of applying messages to the new state
type worker struct {
mu sync.Mutex
agents []Agent
recv chan *types.Block
mux *event.TypeMux
quit chan struct{}
pow pow.PoW
eth core.Backend
chain *core.ChainManager
proc *core.BlockProcessor
coinbase common.Address
gasPrice *big.Int
extra []byte
currentMu sync.Mutex
current *environment
uncleMu sync.Mutex
possibleUncles map[common.Hash]*types.Block
txQueueMu sync.Mutex
txQueue map[common.Hash]*types.Transaction
// atomic status counters
mining int32
atWork int32
}
func newWorker(coinbase common.Address, eth core.Backend) *worker {
worker := &worker{
eth: eth,
mux: eth.EventMux(),
recv: make(chan *types.Block),
gasPrice: new(big.Int),
chain: eth.ChainManager(),
proc: eth.BlockProcessor(),
possibleUncles: make(map[common.Hash]*types.Block),
coinbase: coinbase,
txQueue: make(map[common.Hash]*types.Transaction),
quit: make(chan struct{}),
}
go worker.update()
go worker.wait()
worker.commitNewWork()
return worker
}
func (self *worker) pendingState() *state.StateDB {
self.currentMu.Lock()
defer self.currentMu.Unlock()
return self.current.state
}
func (self *worker) pendingBlock() *types.Block {
self.currentMu.Lock()
defer self.currentMu.Unlock()
return self.current.block
}
func (self *worker) start() {
self.mu.Lock()
defer self.mu.Unlock()
atomic.StoreInt32(&self.mining, 1)
// spin up agents
for _, agent := range self.agents {
agent.Start()
}
}
func (self *worker) stop() {
self.mu.Lock()
defer self.mu.Unlock()
if atomic.LoadInt32(&self.mining) == 1 {
var keep []Agent
// stop all agents
for _, agent := range self.agents {
agent.Stop()
// keep all that's not a cpu agent
if _, ok := agent.(*CpuAgent); !ok {
keep = append(keep, agent)
}
}
self.agents = keep
}
atomic.StoreInt32(&self.mining, 0)
atomic.StoreInt32(&self.atWork, 0)
}
func (self *worker) register(agent Agent) {
self.mu.Lock()
defer self.mu.Unlock()
self.agents = append(self.agents, agent)
agent.SetReturnCh(self.recv)
}
func (self *worker) update() {
events := self.mux.Subscribe(core.ChainHeadEvent{}, core.ChainSideEvent{}, core.TxPreEvent{})
out:
for {
select {
case event := <-events.Chan():
switch ev := event.(type) {
case core.ChainHeadEvent:
self.commitNewWork()
case core.ChainSideEvent:
self.uncleMu.Lock()
self.possibleUncles[ev.Block.Hash()] = ev.Block
self.uncleMu.Unlock()
case core.TxPreEvent:
// Apply transaction to the pending state if we're not mining
if atomic.LoadInt32(&self.mining) == 0 {
self.mu.Lock()
self.commitTransactions(types.Transactions{ev.Tx})
self.mu.Unlock()
}
}
case <-self.quit:
break out
}
}
events.Unsubscribe()
}
func (self *worker) wait() {
for {
for block := range self.recv {
atomic.AddInt32(&self.atWork, -1)
if block == nil {
continue
}
if _, err := self.chain.InsertChain(types.Blocks{block}); err == nil {
for _, uncle := range block.Uncles() {
delete(self.possibleUncles, uncle.Hash())
}
self.mux.Post(core.NewMinedBlockEvent{block})
glog.V(logger.Info).Infof("🔨 Mined block #%v", block.Number())
jsonlogger.LogJson(&logger.EthMinerNewBlock{
BlockHash: block.Hash().Hex(),
BlockNumber: block.Number(),
ChainHeadHash: block.ParentHeaderHash.Hex(),
BlockPrevHash: block.ParentHeaderHash.Hex(),
})
} else {
self.commitNewWork()
}
}
}
}
func (self *worker) push() {
if atomic.LoadInt32(&self.mining) == 1 {
self.current.block.Header().GasUsed = self.current.totalUsedGas
self.current.block.SetRoot(self.current.state.Root())
// push new work to agents
for _, agent := range self.agents {
atomic.AddInt32(&self.atWork, 1)
if agent.Work() != nil {
agent.Work() <- self.current.block.Copy()
} else {
common.Report(fmt.Sprintf("%v %T\n", agent, agent))
}
}
}
}
func (self *worker) makeCurrent() {
block := self.chain.NewBlock(self.coinbase)
if block.Time() == self.chain.CurrentBlock().Time() {
block.Header().Time++
}
block.Header().Extra = self.extra
current := env(block, self.eth)
for _, ancestor := range self.chain.GetAncestors(block, 7) {
for _, uncle := range ancestor.Uncles() {
current.family.Add(uncle.Hash())
}
current.family.Add(ancestor.Hash())
current.ancestors.Add(ancestor.Hash())
}
accounts, _ := self.eth.AccountManager().Accounts()
// Keep track of transactions which return errors so they can be removed
current.remove = set.New()
current.tcount = 0
current.ignoredTransactors = set.New()
current.lowGasTransactors = set.New()
current.ownedAccounts = accountAddressesSet(accounts)
parent := self.chain.GetBlock(current.block.ParentHash())
current.coinbase.SetGasPool(core.CalcGasLimit(parent))
self.current = current
}
func (w *worker) setGasPrice(p *big.Int) {
w.mu.Lock()
defer w.mu.Unlock()
// calculate the minimal gas price the miner accepts when sorting out transactions.
const pct = int64(90)
w.gasPrice = gasprice(p, pct)
w.mux.Post(core.GasPriceChanged{w.gasPrice})
}
func (self *worker) commitNewWork() {
self.mu.Lock()
defer self.mu.Unlock()
self.uncleMu.Lock()
defer self.uncleMu.Unlock()
self.currentMu.Lock()
defer self.currentMu.Unlock()
self.makeCurrent()
current := self.current
transactions := self.eth.TxPool().GetTransactions()
sort.Sort(types.TxByNonce{transactions})
// commit transactions for this run
self.commitTransactions(transactions)
self.eth.TxPool().RemoveTransactions(current.lowGasTxs)
var (
uncles []*types.Header
badUncles []common.Hash
)
for hash, uncle := range self.possibleUncles {
if len(uncles) == 2 {
break
}
if err := self.commitUncle(uncle.Header()); err != nil {
if glog.V(logger.Ridiculousness) {
glog.V(logger.Detail).Infof("Bad uncle found and will be removed (%x)\n", hash[:4])
glog.V(logger.Detail).Infoln(uncle)
}
badUncles = append(badUncles, hash)
} else {
glog.V(logger.Debug).Infof("commiting %x as uncle\n", hash[:4])
uncles = append(uncles, uncle.Header())
}
}
// We only care about logging if we're actually mining
if atomic.LoadInt32(&self.mining) == 1 {
glog.V(logger.Info).Infof("commit new work on block %v with %d txs & %d uncles\n", current.block.Number(), current.tcount, len(uncles))
}
for _, hash := range badUncles {
delete(self.possibleUncles, hash)
}
self.current.block.SetUncles(uncles)
core.AccumulateRewards(self.current.state, self.current.block)
self.current.state.Update()
self.push()
}
var (
inclusionReward = new(big.Int).Div(core.BlockReward, big.NewInt(32))
_uncleReward = new(big.Int).Mul(core.BlockReward, big.NewInt(15))
uncleReward = new(big.Int).Div(_uncleReward, big.NewInt(16))
)
func (self *worker) commitUncle(uncle *types.Header) error {
if self.current.uncles.Has(uncle.Hash()) {
// Error not unique
return core.UncleError("Uncle not unique")
}
self.current.uncles.Add(uncle.Hash())
if !self.current.ancestors.Has(uncle.ParentHash) {
return core.UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
}
if self.current.family.Has(uncle.Hash()) {
return core.UncleError(fmt.Sprintf("Uncle already in family (%x)", uncle.Hash()))
}
return nil
}
func (self *worker) commitTransactions(transactions types.Transactions) {
current := self.current
for _, tx := range transactions {
// We can skip err. It has already been validated in the tx pool
from, _ := tx.From()
// Check if it falls within margin. Txs from owned accounts are always processed.
if tx.GasPrice().Cmp(self.gasPrice) < 0 && !current.ownedAccounts.Has(from) {
// ignore the transaction and transactor. We ignore the transactor
// because nonce will fail after ignoring this transaction so there's
// no point
current.lowGasTransactors.Add(from)
glog.V(logger.Info).Infof("transaction(%x) below gas price (tx=%v ask=%v). All sequential txs from this address(%x) will be ignored\n", tx.Hash().Bytes()[:4], common.CurrencyToString(tx.GasPrice()), common.CurrencyToString(self.gasPrice), from[:4])
}
// Continue with the next transaction if the transaction sender is included in
// the low gas tx set. This will also remove the tx and all sequential transaction
// from this transactor
if current.lowGasTransactors.Has(from) {
// add tx to the low gas set. This will be removed at the end of the run
// owned accounts are ignored
if !current.ownedAccounts.Has(from) {
current.lowGasTxs = append(current.lowGasTxs, tx)
}
continue
}
// Move on to the next transaction when the transactor is in ignored transactions set
// This may occur when a transaction hits the gas limit. When a gas limit is hit and
// the transaction is processed (that could potentially be included in the block) it
// will throw a nonce error because the previous transaction hasn't been processed.
// Therefor we need to ignore any transaction after the ignored one.
if current.ignoredTransactors.Has(from) {
continue
}
self.current.state.StartRecord(tx.Hash(), common.Hash{}, 0)
err := self.commitTransaction(tx)
switch {
case core.IsNonceErr(err) || core.IsInvalidTxErr(err):
// Remove invalid transactions
from, _ := tx.From()
self.chain.TxState().RemoveNonce(from, tx.Nonce())
current.remove.Add(tx.Hash())
if glog.V(logger.Detail) {
glog.Infof("TX (%x) failed, will be removed: %v\n", tx.Hash().Bytes()[:4], err)
}
case state.IsGasLimitErr(err):
from, _ := tx.From()
// ignore the transactor so no nonce errors will be thrown for this account
// next time the worker is run, they'll be picked up again.
current.ignoredTransactors.Add(from)
glog.V(logger.Detail).Infof("Gas limit reached for (%x) in this block. Continue to try smaller txs\n", from[:4])
default:
current.tcount++
}
}
}
func (self *worker) commitTransaction(tx *types.Transaction) error {
snap := self.current.state.Copy()
receipt, _, err := self.proc.ApplyTransaction(self.current.coinbase, self.current.state, self.current.block, tx, self.current.totalUsedGas, true)
if err != nil && (core.IsNonceErr(err) || state.IsGasLimitErr(err) || core.IsInvalidTxErr(err)) {
self.current.state.Set(snap)
return err
}
self.current.block.AddTransaction(tx)
self.current.block.AddReceipt(receipt)
return nil
}
func (self *worker) HashRate() int64 {
var tot int64
for _, agent := range self.agents {
tot += agent.GetHashRate()
}
return tot
}
// gasprice calculates a reduced gas price based on the pct
// XXX Use big.Rat?
func gasprice(price *big.Int, pct int64) *big.Int {
p := new(big.Int).Set(price)
p.Div(p, big.NewInt(100))
p.Mul(p, big.NewInt(pct))
return p
}
func accountAddressesSet(accounts []accounts.Account) *set.Set {
accountSet := set.New()
for _, account := range accounts {
accountSet.Add(account.Address)
}
return accountSet
}