package miner import ( "fmt" "math/big" "sort" "sync" "sync/atomic" "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() type environment struct { totalUsedGas *big.Int state *state.StateDB coinbase *state.StateObject block *types.Block family *set.Set uncles *set.Set } 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, family: set.New(), uncles: set.New(), coinbase: state.GetOrNewStateObject(block.Coinbase()), } return env } type Work struct { Number uint64 Nonce uint64 MixDigest []byte SeedHash []byte } type Agent interface { Work() chan<- *types.Block SetReturnCh(chan<- *types.Block) Stop() Start() GetHashRate() int64 } 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 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), 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() { // spin up agents for _, agent := range self.agents { agent.Start() } atomic.StoreInt32(&self.mining, 1) } func (self *worker) stop() { if atomic.LoadInt32(&self.mining) == 1 { // stop all agents for _, agent := range self.agents { agent.Stop() } } atomic.StoreInt32(&self.mining, 0) atomic.StoreInt32(&self.atWork, 0) } func (self *worker) register(agent Agent) { 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: if atomic.LoadInt32(&self.mining) == 0 { self.commitNewWork() } } 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 self.current = env(block, self.eth) for _, ancestor := range self.chain.GetAncestors(block, 7) { self.current.family.Add(ancestor.Hash()) } parent := self.chain.GetBlock(self.current.block.ParentHash()) self.current.coinbase.SetGasPool(core.CalcGasLimit(parent)) } 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() transactions := self.eth.TxPool().GetTransactions() sort.Sort(types.TxByNonce{transactions}) // Keep track of transactions which return errors so they can be removed var ( remove = set.New() tcount = 0 ignoredTransactors = set.New() ) for _, tx := range transactions { // We can skip err. It has already been validated in the tx pool from, _ := tx.From() // 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 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()) 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. 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: tcount++ } } 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", self.current.block.Number(), 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.family.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) 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 }