package ethchain import ( "bytes" "container/list" "fmt" "math/big" "os" "sync" "time" "github.com/ethereum/eth-go/ethcrypto" "github.com/ethereum/eth-go/ethlog" "github.com/ethereum/eth-go/ethreact" "github.com/ethereum/eth-go/ethstate" "github.com/ethereum/eth-go/ethutil" "github.com/ethereum/eth-go/ethwire" "github.com/ethereum/eth-go/eventer" ) var statelogger = ethlog.NewLogger("STATE") type Peer interface { Inbound() bool LastSend() time.Time LastPong() int64 Host() []byte Port() uint16 Version() string PingTime() string Connected() *int32 Caps() *ethutil.Value } type EthManager interface { StateManager() *StateManager BlockChain() *BlockChain TxPool() *TxPool Broadcast(msgType ethwire.MsgType, data []interface{}) Reactor() *ethreact.ReactorEngine PeerCount() int IsMining() bool IsListening() bool Peers() *list.List KeyManager() *ethcrypto.KeyManager ClientIdentity() ethwire.ClientIdentity Db() ethutil.Database Eventer() *eventer.EventMachine } type StateManager struct { // Mutex for locking the block processor. Blocks can only be handled one at a time mutex sync.Mutex // Canonical block chain bc *BlockChain // non-persistent key/value memory storage mem map[string]*big.Int // Proof of work used for validating Pow PoW // The ethereum manager interface eth EthManager // The managed states // Transiently state. The trans state isn't ever saved, validated and // it could be used for setting account nonces without effecting // the main states. transState *ethstate.State // Mining state. The mining state is used purely and solely by the mining // operation. miningState *ethstate.State // The last attempted block is mainly used for debugging purposes // This does not have to be a valid block and will be set during // 'Process' & canonical validation. lastAttemptedBlock *Block // Quit chan quit chan bool } func NewStateManager(ethereum EthManager) *StateManager { sm := &StateManager{ mem: make(map[string]*big.Int), Pow: &EasyPow{}, eth: ethereum, bc: ethereum.BlockChain(), quit: make(chan bool), } sm.transState = ethereum.BlockChain().CurrentBlock.State().Copy() sm.miningState = ethereum.BlockChain().CurrentBlock.State().Copy() return sm } func (self *StateManager) Start() { statelogger.Debugln("Starting state manager") go self.updateThread() } func (self *StateManager) Stop() { statelogger.Debugln("Stopping state manager") close(self.quit) } func (self *StateManager) updateThread() { blockChan := self.eth.Eventer().Register("block") out: for { select { case event := <-blockChan: block := event.Data.(*Block) err := self.Process(block, false) if err != nil { statelogger.Infoln(err) statelogger.Debugf("Block #%v failed (%x...)\n", block.Number, block.Hash()[0:4]) statelogger.Debugln(block) } case <-self.quit: break out } } } func (sm *StateManager) CurrentState() *ethstate.State { return sm.eth.BlockChain().CurrentBlock.State() } func (sm *StateManager) TransState() *ethstate.State { return sm.transState } func (sm *StateManager) MiningState() *ethstate.State { return sm.miningState } func (sm *StateManager) NewMiningState() *ethstate.State { sm.miningState = sm.eth.BlockChain().CurrentBlock.State().Copy() return sm.miningState } func (sm *StateManager) BlockChain() *BlockChain { return sm.bc } func (self *StateManager) ProcessTransactions(coinbase *ethstate.StateObject, state *ethstate.State, block, parent *Block, txs Transactions) (Receipts, Transactions, Transactions, error) { var ( receipts Receipts handled, unhandled Transactions totalUsedGas = big.NewInt(0) err error ) done: for i, tx := range txs { txGas := new(big.Int).Set(tx.Gas) cb := state.GetStateObject(coinbase.Address()) st := NewStateTransition(cb, tx, state, block) err = st.TransitionState() if err != nil { statelogger.Infoln(err) switch { case IsNonceErr(err): err = nil // ignore error continue case IsGasLimitErr(err): unhandled = txs[i:] break done default: statelogger.Infoln(err) err = nil //return nil, nil, nil, err } } // Update the state with pending changes state.Update() txGas.Sub(txGas, st.gas) accumelative := new(big.Int).Set(totalUsedGas.Add(totalUsedGas, txGas)) receipt := &Receipt{tx, ethutil.CopyBytes(state.Root().([]byte)), accumelative} if i < len(block.Receipts()) { original := block.Receipts()[i] if !original.Cmp(receipt) { if ethutil.Config.Diff { os.Exit(1) } err := fmt.Errorf("#%d receipt failed (r) %v ~ %x <=> (c) %v ~ %x (%x...)", i+1, original.CumulativeGasUsed, original.PostState[0:4], receipt.CumulativeGasUsed, receipt.PostState[0:4], receipt.Tx.Hash()[0:4]) return nil, nil, nil, err } } // Notify all subscribers self.eth.Reactor().Post("newTx:post", tx) receipts = append(receipts, receipt) handled = append(handled, tx) if ethutil.Config.Diff && ethutil.Config.DiffType == "all" { state.CreateOutputForDiff() } } parent.GasUsed = totalUsedGas return receipts, handled, unhandled, err } func (sm *StateManager) Process(block *Block, dontReact bool) (err error) { // Processing a blocks may never happen simultaneously sm.mutex.Lock() defer sm.mutex.Unlock() if sm.bc.HasBlock(block.Hash()) { return nil } if !sm.bc.HasBlock(block.PrevHash) { return ParentError(block.PrevHash) } sm.lastAttemptedBlock = block var ( parent = sm.bc.GetBlock(block.PrevHash) state = parent.State() ) // Defer the Undo on the Trie. If the block processing happened // we don't want to undo but since undo only happens on dirty // nodes this won't happen because Commit would have been called // before that. defer state.Reset() if ethutil.Config.Diff && ethutil.Config.DiffType == "all" { fmt.Printf("## %x %x ##\n", block.Hash(), block.Number) } receipts, err := sm.ApplyDiff(state, parent, block) if err != nil { return err } txSha := CreateTxSha(receipts) if bytes.Compare(txSha, block.TxSha) != 0 { return fmt.Errorf("Error validating tx sha. Received %x, got %x", block.TxSha, txSha) } // Block validation if err = sm.ValidateBlock(block); err != nil { statelogger.Errorln("Error validating block:", err) return err } if err = sm.AccumelateRewards(state, block, parent); err != nil { statelogger.Errorln("Error accumulating reward", err) return err } state.Update() if !block.State().Cmp(state) { err = fmt.Errorf("Invalid merkle root.\nrec: %x\nis: %x", block.State().Trie.Root, state.Trie.Root) return } // Calculate the new total difficulty and sync back to the db if sm.CalculateTD(block) { // Sync the current block's state to the database and cancelling out the deferred Undo state.Sync() // Add the block to the chain sm.bc.Add(block) sm.transState = state.Copy() // Create a bloom bin for this block filter := sm.createBloomFilter(state) // Persist the data fk := append([]byte("bloom"), block.Hash()...) sm.eth.Db().Put(fk, filter.Bin()) statelogger.Infof("Imported block #%d (%x...)\n", block.Number, block.Hash()[0:4]) if dontReact == false { sm.eth.Reactor().Post("newBlock", block) state.Manifest().Reset() } sm.eth.TxPool().RemoveInvalid(state) } else { statelogger.Errorln("total diff failed") } return nil } func (sm *StateManager) ApplyDiff(state *ethstate.State, parent, block *Block) (receipts Receipts, err error) { coinbase := state.GetOrNewStateObject(block.Coinbase) coinbase.SetGasPool(block.CalcGasLimit(parent)) // Process the transactions on to current block receipts, _, _, err = sm.ProcessTransactions(coinbase, state, block, parent, block.Transactions()) if err != nil { return nil, err } return receipts, nil } func (sm *StateManager) CalculateTD(block *Block) bool { uncleDiff := new(big.Int) for _, uncle := range block.Uncles { uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty) } // TD(genesis_block) = 0 and TD(B) = TD(B.parent) + sum(u.difficulty for u in B.uncles) + B.difficulty td := new(big.Int) td = td.Add(sm.bc.TD, uncleDiff) td = td.Add(td, block.Difficulty) // The new TD will only be accepted if the new difficulty is // is greater than the previous. if td.Cmp(sm.bc.TD) > 0 { // Set the new total difficulty back to the block chain sm.bc.SetTotalDifficulty(td) return true } return false } // Validates the current block. Returns an error if the block was invalid, // an uncle or anything that isn't on the current block chain. // Validation validates easy over difficult (dagger takes longer time = difficult) func (sm *StateManager) ValidateBlock(block *Block) error { // TODO // 2. Check if the difficulty is correct // Check each uncle's previous hash. In order for it to be valid // is if it has the same block hash as the current parent := sm.bc.GetBlock(block.PrevHash) /* for _, uncle := range block.Uncles { if bytes.Compare(uncle.PrevHash,parent.PrevHash) != 0 { return ValidationError("Mismatch uncle's previous hash. Expected %x, got %x",parent.PrevHash, uncle.PrevHash) } } */ diff := block.Time - parent.Time if diff < 0 { return ValidationError("Block timestamp less then prev block %v (%v - %v)", diff, block.Time, sm.bc.CurrentBlock.Time) } /* XXX // New blocks must be within the 15 minute range of the last block. if diff > int64(15*time.Minute) { return ValidationError("Block is too far in the future of last block (> 15 minutes)") } */ // Verify the nonce of the block. Return an error if it's not valid if !sm.Pow.Verify(block.HashNoNonce(), block.Difficulty, block.Nonce) { return ValidationError("Block's nonce is invalid (= %v)", ethutil.Bytes2Hex(block.Nonce)) } return nil } func (sm *StateManager) AccumelateRewards(state *ethstate.State, block, parent *Block) error { reward := new(big.Int).Set(BlockReward) knownUncles := ethutil.Set(parent.Uncles) nonces := ethutil.NewSet(block.Nonce) for _, uncle := range block.Uncles { if nonces.Include(uncle.Nonce) { // Error not unique return UncleError("Uncle not unique") } uncleParent := sm.bc.GetBlock(uncle.PrevHash) if uncleParent == nil { return UncleError("Uncle's parent unknown") } if uncleParent.Number.Cmp(new(big.Int).Sub(parent.Number, big.NewInt(6))) < 0 { return UncleError("Uncle too old") } if knownUncles.Include(uncle.Hash()) { return UncleError("Uncle in chain") } nonces.Insert(uncle.Nonce) r := new(big.Int) r.Mul(BlockReward, big.NewInt(15)).Div(r, big.NewInt(16)) uncleAccount := state.GetAccount(uncle.Coinbase) uncleAccount.AddAmount(r) reward.Add(reward, new(big.Int).Div(BlockReward, big.NewInt(32))) } // Get the account associated with the coinbase account := state.GetAccount(block.Coinbase) // Reward amount of ether to the coinbase address account.AddAmount(reward) return nil } // Manifest will handle both creating notifications and generating bloom bin data func (sm *StateManager) createBloomFilter(state *ethstate.State) *BloomFilter { bloomf := NewBloomFilter(nil) for _, msg := range state.Manifest().Messages { bloomf.Set(msg.To) bloomf.Set(msg.From) } sm.eth.Reactor().Post("messages", state.Manifest().Messages) return bloomf } func (sm *StateManager) GetMessages(block *Block) (messages []*ethstate.Message, err error) { if !sm.bc.HasBlock(block.PrevHash) { return nil, ParentError(block.PrevHash) } sm.lastAttemptedBlock = block var ( parent = sm.bc.GetBlock(block.PrevHash) state = parent.State().Copy() ) defer state.Reset() sm.ApplyDiff(state, parent, block) sm.AccumelateRewards(state, block, parent) return state.Manifest().Messages, nil }