BlockManager => BlockProcessor
This commit is contained in:
obscuren
359
core/block_processor.go
Normal file
359
core/block_processor.go
Normal file
@@ -0,0 +1,359 @@
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package core
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import (
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"bytes"
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"errors"
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"fmt"
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"math/big"
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"sync"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/pow"
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"github.com/ethereum/go-ethereum/pow/ezp"
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"github.com/ethereum/go-ethereum/state"
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"gopkg.in/fatih/set.v0"
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)
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var statelogger = logger.NewLogger("BLOCK")
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type EthManager interface {
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BlockProcessor() *BlockProcessor
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ChainManager() *ChainManager
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TxPool() *TxPool
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PeerCount() int
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IsMining() bool
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IsListening() bool
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Peers() []*p2p.Peer
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KeyManager() *crypto.KeyManager
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ClientIdentity() p2p.ClientIdentity
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Db() ethutil.Database
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EventMux() *event.TypeMux
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}
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type BlockProcessor struct {
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// Mutex for locking the block processor. Blocks can only be handled one at a time
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mutex sync.Mutex
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// Canonical block chain
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bc *ChainManager
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// non-persistent key/value memory storage
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mem map[string]*big.Int
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// Proof of work used for validating
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Pow pow.PoW
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txpool *TxPool
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// The last attempted block is mainly used for debugging purposes
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// This does not have to be a valid block and will be set during
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// 'Process' & canonical validation.
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lastAttemptedBlock *types.Block
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events event.Subscription
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eventMux *event.TypeMux
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}
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func NewBlockProcessor(txpool *TxPool, chainManager *ChainManager, eventMux *event.TypeMux) *BlockProcessor {
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sm := &BlockProcessor{
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mem: make(map[string]*big.Int),
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Pow: ezp.New(),
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bc: chainManager,
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eventMux: eventMux,
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txpool: txpool,
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}
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return sm
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}
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func (sm *BlockProcessor) TransitionState(statedb *state.StateDB, parent, block *types.Block) (receipts types.Receipts, err error) {
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coinbase := statedb.GetOrNewStateObject(block.Header().Coinbase)
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coinbase.SetGasPool(CalcGasLimit(parent, block))
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// Process the transactions on to current block
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receipts, _, _, _, err = sm.ApplyTransactions(coinbase, statedb, block, block.Transactions(), false)
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if err != nil {
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return nil, err
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}
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return receipts, nil
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}
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func (self *BlockProcessor) ApplyTransactions(coinbase *state.StateObject, state *state.StateDB, block *types.Block, txs types.Transactions, transientProcess bool) (types.Receipts, types.Transactions, types.Transactions, types.Transactions, error) {
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var (
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receipts types.Receipts
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handled, unhandled types.Transactions
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erroneous types.Transactions
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totalUsedGas = big.NewInt(0)
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err error
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cumulativeSum = new(big.Int)
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)
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done:
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for i, tx := range txs {
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// If we are mining this block and validating we want to set the logs back to 0
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state.EmptyLogs()
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txGas := new(big.Int).Set(tx.Gas())
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cb := state.GetStateObject(coinbase.Address())
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st := NewStateTransition(NewEnv(state, self.bc, tx, block), tx, cb)
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_, err = st.TransitionState()
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if err != nil {
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switch {
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case IsNonceErr(err):
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err = nil // ignore error
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continue
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case IsGasLimitErr(err):
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unhandled = txs[i:]
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break done
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default:
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statelogger.Infoln(err)
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erroneous = append(erroneous, tx)
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err = nil
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}
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}
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txGas.Sub(txGas, st.gas)
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cumulativeSum.Add(cumulativeSum, new(big.Int).Mul(txGas, tx.GasPrice()))
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// Update the state with pending changes
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state.Update(txGas)
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cumulative := new(big.Int).Set(totalUsedGas.Add(totalUsedGas, txGas))
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receipt := types.NewReceipt(state.Root(), cumulative)
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receipt.SetLogs(state.Logs())
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receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
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chainlogger.Debugln(receipt)
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// Notify all subscribers
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if !transientProcess {
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go self.eventMux.Post(TxPostEvent{tx})
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}
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receipts = append(receipts, receipt)
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handled = append(handled, tx)
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if ethutil.Config.Diff && ethutil.Config.DiffType == "all" {
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state.CreateOutputForDiff()
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}
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}
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block.Reward = cumulativeSum
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block.Header().GasUsed = totalUsedGas
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return receipts, handled, unhandled, erroneous, err
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}
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func (sm *BlockProcessor) Process(block *types.Block) (td *big.Int, msgs state.Messages, err error) {
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// Processing a blocks may never happen simultaneously
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sm.mutex.Lock()
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defer sm.mutex.Unlock()
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header := block.Header()
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if sm.bc.HasBlock(header.Hash()) {
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return nil, nil, &KnownBlockError{header.Number, header.Hash()}
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}
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if !sm.bc.HasBlock(header.ParentHash) {
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return nil, nil, ParentError(header.ParentHash)
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}
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parent := sm.bc.GetBlock(header.ParentHash)
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return sm.ProcessWithParent(block, parent)
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}
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func (sm *BlockProcessor) ProcessWithParent(block, parent *types.Block) (td *big.Int, messages state.Messages, err error) {
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sm.lastAttemptedBlock = block
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state := state.New(parent.Trie().Copy())
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// Block validation
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if err = sm.ValidateBlock(block, parent); err != nil {
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return
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}
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receipts, err := sm.TransitionState(state, parent, block)
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if err != nil {
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return
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}
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header := block.Header()
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rbloom := types.CreateBloom(receipts)
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if bytes.Compare(rbloom, header.Bloom) != 0 {
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err = fmt.Errorf("unable to replicate block's bloom=%x", rbloom)
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return
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}
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txSha := types.DeriveSha(block.Transactions())
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if bytes.Compare(txSha, header.TxHash) != 0 {
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err = fmt.Errorf("validating transaction root. received=%x got=%x", header.TxHash, txSha)
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return
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}
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receiptSha := types.DeriveSha(receipts)
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if bytes.Compare(receiptSha, header.ReceiptHash) != 0 {
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fmt.Println("receipts", receipts)
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err = fmt.Errorf("validating receipt root. received=%x got=%x", header.ReceiptHash, receiptSha)
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return
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}
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if err = sm.AccumelateRewards(state, block, parent); err != nil {
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return
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}
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state.Update(ethutil.Big0)
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if !bytes.Equal(header.Root, state.Root()) {
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err = fmt.Errorf("invalid merkle root. received=%x got=%x", header.Root, state.Root())
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return
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}
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// Calculate the new total difficulty and sync back to the db
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if td, ok := sm.CalculateTD(block); ok {
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// Sync the current block's state to the database and cancelling out the deferred Undo
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state.Sync()
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state.Manifest().SetHash(block.Hash())
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messages := state.Manifest().Messages
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state.Manifest().Reset()
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chainlogger.Infof("Processed block #%d (%x...)\n", header.Number, block.Hash()[0:4])
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sm.txpool.RemoveSet(block.Transactions())
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return td, messages, nil
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} else {
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return nil, nil, errors.New("total diff failed")
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}
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}
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func (sm *BlockProcessor) CalculateTD(block *types.Block) (*big.Int, bool) {
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uncleDiff := new(big.Int)
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for _, uncle := range block.Uncles() {
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uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
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}
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// TD(genesis_block) = 0 and TD(B) = TD(B.parent) + sum(u.difficulty for u in B.uncles) + B.difficulty
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td := new(big.Int)
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td = td.Add(sm.bc.Td(), uncleDiff)
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td = td.Add(td, block.Header().Difficulty)
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// The new TD will only be accepted if the new difficulty is
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// is greater than the previous.
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if td.Cmp(sm.bc.Td()) > 0 {
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return td, true
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}
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return nil, false
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}
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// Validates the current block. Returns an error if the block was invalid,
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// an uncle or anything that isn't on the current block chain.
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// Validation validates easy over difficult (dagger takes longer time = difficult)
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func (sm *BlockProcessor) ValidateBlock(block, parent *types.Block) error {
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expd := CalcDifficulty(block, parent)
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if expd.Cmp(block.Header().Difficulty) < 0 {
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return fmt.Errorf("Difficulty check failed for block %v, %v", block.Header().Difficulty, expd)
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}
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diff := block.Header().Time - parent.Header().Time
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if diff < 0 {
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return ValidationError("Block timestamp less then prev block %v (%v - %v)", diff, block.Header().Time, sm.bc.CurrentBlock().Header().Time)
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}
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/* XXX
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// New blocks must be within the 15 minute range of the last block.
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if diff > int64(15*time.Minute) {
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return ValidationError("Block is too far in the future of last block (> 15 minutes)")
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}
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*/
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// Verify the nonce of the block. Return an error if it's not valid
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if !sm.Pow.Verify(block /*block.HashNoNonce(), block.Difficulty, block.Nonce*/) {
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return ValidationError("Block's nonce is invalid (= %v)", ethutil.Bytes2Hex(block.Header().Nonce))
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}
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return nil
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}
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func (sm *BlockProcessor) AccumelateRewards(statedb *state.StateDB, block, parent *types.Block) error {
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reward := new(big.Int).Set(BlockReward)
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knownUncles := set.New()
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for _, uncle := range parent.Uncles() {
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knownUncles.Add(string(uncle.Hash()))
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}
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nonces := ethutil.NewSet(block.Header().Nonce)
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for _, uncle := range block.Uncles() {
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if nonces.Include(uncle.Nonce) {
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// Error not unique
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return UncleError("Uncle not unique")
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}
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uncleParent := sm.bc.GetBlock(uncle.ParentHash)
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if uncleParent == nil {
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return UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
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}
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if uncleParent.Header().Number.Cmp(new(big.Int).Sub(parent.Header().Number, big.NewInt(6))) < 0 {
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return UncleError("Uncle too old")
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}
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if knownUncles.Has(string(uncle.Hash())) {
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return UncleError("Uncle in chain")
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}
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nonces.Insert(uncle.Nonce)
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r := new(big.Int)
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r.Mul(BlockReward, big.NewInt(15)).Div(r, big.NewInt(16))
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uncleAccount := statedb.GetAccount(uncle.Coinbase)
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uncleAccount.AddAmount(r)
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reward.Add(reward, new(big.Int).Div(BlockReward, big.NewInt(32)))
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}
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// Get the account associated with the coinbase
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account := statedb.GetAccount(block.Header().Coinbase)
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// Reward amount of ether to the coinbase address
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account.AddAmount(reward)
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statedb.Manifest().AddMessage(&state.Message{
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To: block.Header().Coinbase,
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Input: nil,
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Origin: nil,
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Timestamp: int64(block.Header().Time), Coinbase: block.Header().Coinbase, Number: block.Header().Number,
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Value: new(big.Int).Add(reward, block.Reward),
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})
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return nil
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}
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func (sm *BlockProcessor) GetMessages(block *types.Block) (messages []*state.Message, err error) {
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if !sm.bc.HasBlock(block.Header().ParentHash) {
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return nil, ParentError(block.Header().ParentHash)
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}
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sm.lastAttemptedBlock = block
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var (
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parent = sm.bc.GetBlock(block.Header().ParentHash)
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state = state.New(parent.Trie().Copy())
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)
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defer state.Reset()
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sm.TransitionState(state, parent, block)
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sm.AccumelateRewards(state, block, parent)
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return state.Manifest().Messages, nil
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}
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