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package core
import (
"bytes"
"fmt"
"math/big"
"sync"
"time"
"github.com/ethereum/c-ethash/go-ethash"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/pow"
_ "github.com/ethereum/go-ethereum/pow/ezp"
"github.com/ethereum/go-ethereum/state"
"gopkg.in/fatih/set.v0"
)
type PendingBlockEvent struct {
Block *types.Block
}
var statelogger = logger.NewLogger("BLOCK")
type EthManager interface {
BlockProcessor() *BlockProcessor
ChainManager() *ChainManager
TxPool() *TxPool
PeerCount() int
IsMining() bool
IsListening() bool
Peers() []*p2p.Peer
KeyManager() *crypto.KeyManager
ClientIdentity() p2p.ClientIdentity
Db() ethutil.Database
EventMux() *event.TypeMux
}
type BlockProcessor struct {
db ethutil.Database
// Mutex for locking the block processor. Blocks can only be handled one at a time
mutex sync.Mutex
// Canonical block chain
bc *ChainManager
// non-persistent key/value memory storage
mem map[string]*big.Int
// Proof of work used for validating
Pow pow.PoW
txpool *TxPool
// 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 *types.Block
events event.Subscription
eventMux *event.TypeMux
}
func NewBlockProcessor(db ethutil.Database, txpool *TxPool, chainManager *ChainManager, eventMux *event.TypeMux) *BlockProcessor {
sm := &BlockProcessor{
db: db,
mem: make(map[string]*big.Int),
Pow: ðash.Ethash{},
bc: chainManager,
eventMux: eventMux,
txpool: txpool,
}
return sm
}
func (sm *BlockProcessor) TransitionState(statedb *state.StateDB, parent, block *types.Block) (receipts types.Receipts, err error) {
coinbase := statedb.GetOrNewStateObject(block.Header().Coinbase)
coinbase.SetGasPool(CalcGasLimit(parent, block))
// Process the transactions on to parent state
receipts, _, _, _, err = sm.ApplyTransactions(coinbase, statedb, block, block.Transactions(), false)
if err != nil {
return nil, err
}
return receipts, nil
}
func (self *BlockProcessor) ApplyTransaction(coinbase *state.StateObject, state *state.StateDB, block *types.Block, tx *types.Transaction, usedGas *big.Int, transientProcess bool) (*types.Receipt, *big.Int, error) {
// If we are mining this block and validating we want to set the logs back to 0
state.EmptyLogs()
txGas := new(big.Int).Set(tx.Gas())
cb := state.GetStateObject(coinbase.Address())
st := NewStateTransition(NewEnv(state, self.bc, tx, block), tx, cb)
_, err := st.TransitionState()
txGas.Sub(txGas, st.gas)
// Update the state with pending changes
state.Update(txGas)
cumulative := new(big.Int).Set(usedGas.Add(usedGas, txGas))
receipt := types.NewReceipt(state.Root(), cumulative)
receipt.SetLogs(state.Logs())
receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
chainlogger.Debugln(receipt)
// Notify all subscribers
if !transientProcess {
go self.eventMux.Post(TxPostEvent{tx})
}
go self.eventMux.Post(state.Logs())
return receipt, txGas, err
}
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) {
var (
receipts types.Receipts
handled, unhandled types.Transactions
erroneous types.Transactions
totalUsedGas = big.NewInt(0)
err error
cumulativeSum = new(big.Int)
)
for _, tx := range txs {
receipt, txGas, err := self.ApplyTransaction(coinbase, state, block, tx, totalUsedGas, transientProcess)
if err != nil {
switch {
case IsNonceErr(err):
return nil, nil, nil, nil, err
case IsGasLimitErr(err):
return nil, nil, nil, nil, err
default:
statelogger.Infoln(err)
erroneous = append(erroneous, tx)
err = nil
}
}
receipts = append(receipts, receipt)
handled = append(handled, tx)
cumulativeSum.Add(cumulativeSum, new(big.Int).Mul(txGas, tx.GasPrice()))
}
block.Reward = cumulativeSum
block.Header().GasUsed = totalUsedGas
if transientProcess {
go self.eventMux.Post(PendingBlockEvent{block})
}
return receipts, handled, unhandled, erroneous, err
}
func (sm *BlockProcessor) Process(block *types.Block) (td *big.Int, err error) {
// Processing a blocks may never happen simultaneously
sm.mutex.Lock()
defer sm.mutex.Unlock()
header := block.Header()
if sm.bc.HasBlock(header.Hash()) {
return nil, &KnownBlockError{header.Number, header.Hash()}
}
if !sm.bc.HasBlock(header.ParentHash) {
return nil, ParentError(header.ParentHash)
}
parent := sm.bc.GetBlock(header.ParentHash)
return sm.ProcessWithParent(block, parent)
}
func (sm *BlockProcessor) ProcessWithParent(block, parent *types.Block) (td *big.Int, err error) {
sm.lastAttemptedBlock = block
state := state.New(parent.Root(), sm.db)
//state := state.New(parent.Trie().Copy())
// Block validation
if err = sm.ValidateBlock(block, parent); err != nil {
return
}
receipts, err := sm.TransitionState(state, parent, block)
if err != nil {
return
}
header := block.Header()
rbloom := types.CreateBloom(receipts)
if bytes.Compare(rbloom, header.Bloom) != 0 {
err = fmt.Errorf("unable to replicate block's bloom=%x", rbloom)
return
}
txSha := types.DeriveSha(block.Transactions())
if bytes.Compare(txSha, header.TxHash) != 0 {
err = fmt.Errorf("validating transaction root. received=%x got=%x", header.TxHash, txSha)
return
}
receiptSha := types.DeriveSha(receipts)
if bytes.Compare(receiptSha, header.ReceiptHash) != 0 {
fmt.Println("receipts", receipts)
err = fmt.Errorf("validating receipt root. received=%x got=%x", header.ReceiptHash, receiptSha)
return
}
if err = sm.AccumulateRewards(state, block, parent); err != nil {
return
}
state.Update(ethutil.Big0)
if !bytes.Equal(header.Root, state.Root()) {
err = fmt.Errorf("invalid merkle root. received=%x got=%x", header.Root, state.Root())
return
}
// Calculate the td for this block
td = CalculateTD(block, parent)
// Sync the current block's state to the database
state.Sync()
// Set the block hashes for the current messages
state.Manifest().SetHash(block.Hash())
// Reset the manifest XXX We need this?
state.Manifest().Reset()
// Remove transactions from the pool
sm.txpool.RemoveSet(block.Transactions())
chainlogger.Infof("processed block #%d (%x...)\n", header.Number, block.Hash()[0:4])
return td, nil
}
// 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 *BlockProcessor) ValidateBlock(block, parent *types.Block) error {
if len(block.Header().Extra) > 1024 {
return fmt.Errorf("Block extra data too long (%d)", len(block.Header().Extra))
}
expd := CalcDifficulty(block, parent)
if expd.Cmp(block.Header().Difficulty) != 0 {
return fmt.Errorf("Difficulty check failed for block %v, %v", block.Header().Difficulty, expd)
}
if block.Time() < parent.Time() {
return ValidationError("Block timestamp not after prev block (%v - %v)", block.Header().Time, parent.Header().Time)
}
if block.Time() > time.Now().Unix() {
return fmt.Errorf("block time is in the future")
}
// Verify the nonce of the block. Return an error if it's not valid
if !sm.Pow.Verify(block) {
return ValidationError("Block's nonce is invalid (= %v)", ethutil.Bytes2Hex(block.Header().Nonce))
}
return nil
}
func (sm *BlockProcessor) AccumulateRewards(statedb *state.StateDB, block, parent *types.Block) error {
reward := new(big.Int).Set(BlockReward)
ancestors := set.New()
for _, ancestor := range sm.bc.GetAncestors(block, 7) {
ancestors.Add(string(ancestor.Hash()))
}
uncles := set.New()
uncles.Add(string(block.Hash()))
for _, uncle := range block.Uncles() {
if uncles.Has(string(uncle.Hash())) {
// Error not unique
return UncleError("Uncle not unique")
}
uncles.Add(string(uncle.Hash()))
if !ancestors.Has(string(uncle.ParentHash)) {
return UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
}
if !sm.Pow.Verify(types.NewBlockWithHeader(uncle)) {
return ValidationError("Uncle's nonce is invalid (= %v)", ethutil.Bytes2Hex(uncle.Nonce))
}
r := new(big.Int)
r.Mul(BlockReward, big.NewInt(15)).Div(r, big.NewInt(16))
uncleAccount := statedb.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 := statedb.GetAccount(block.Header().Coinbase)
// Reward amount of ether to the coinbase address
account.AddAmount(reward)
return nil
}
func (sm *BlockProcessor) GetMessages(block *types.Block) (messages []*state.Message, err error) {
if !sm.bc.HasBlock(block.Header().ParentHash) {
return nil, ParentError(block.Header().ParentHash)
}
sm.lastAttemptedBlock = block
var (
parent = sm.bc.GetBlock(block.Header().ParentHash)
//state = state.New(parent.Trie().Copy())
state = state.New(parent.Root(), sm.db)
)
defer state.Reset()
sm.TransitionState(state, parent, block)
sm.AccumulateRewards(state, block, parent)
return state.Manifest().Messages, nil
}
func (sm *BlockProcessor) GetLogs(block *types.Block) (logs state.Logs, err error) {
if !sm.bc.HasBlock(block.Header().ParentHash) {
return nil, ParentError(block.Header().ParentHash)
}
sm.lastAttemptedBlock = block
var (
parent = sm.bc.GetBlock(block.Header().ParentHash)
//state = state.New(parent.Trie().Copy())
state = state.New(parent.Root(), sm.db)
)
defer state.Reset()
sm.TransitionState(state, parent, block)
sm.AccumulateRewards(state, block, parent)
return state.Logs(), nil
}
|