plugeth/core/block_processor.go

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package core
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import (
"bytes"
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"fmt"
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"math/big"
"sync"
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"time"
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"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethutil"
"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/pow"
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"github.com/ethereum/go-ethereum/pow/ezp"
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"github.com/ethereum/go-ethereum/state"
"gopkg.in/fatih/set.v0"
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)
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type PendingBlockEvent struct {
Block *types.Block
}
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var statelogger = logger.NewLogger("BLOCK")
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type BlockProcessor struct {
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db ethutil.Database
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// Mutex for locking the block processor. Blocks can only be handled one at a time
mutex sync.Mutex
// Canonical block chain
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bc *ChainManager
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// non-persistent key/value memory storage
mem map[string]*big.Int
// Proof of work used for validating
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Pow pow.PoW
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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
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eventMux *event.TypeMux
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}
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func NewBlockProcessor(db ethutil.Database, txpool *TxPool, chainManager *ChainManager, eventMux *event.TypeMux) *BlockProcessor {
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sm := &BlockProcessor{
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db: db,
mem: make(map[string]*big.Int),
//Pow: &ethash.Ethash{},
Pow: ezp.New(),
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bc: chainManager,
eventMux: eventMux,
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) {
coinbase := statedb.GetOrNewStateObject(block.Header().Coinbase)
coinbase.SetGasPool(CalcGasLimit(parent, block))
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// Process the transactions on to parent state
receipts, _, _, _, err = sm.ApplyTransactions(coinbase, statedb, block, block.Transactions(), false)
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if err != nil {
return nil, err
}
return receipts, nil
}
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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})
}
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go self.eventMux.Post(state.Logs())
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return receipt, txGas, err
}
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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 (
receipts types.Receipts
handled, unhandled types.Transactions
erroneous types.Transactions
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totalUsedGas = big.NewInt(0)
err error
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cumulativeSum = new(big.Int)
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)
for _, tx := range txs {
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receipt, txGas, err := self.ApplyTransaction(coinbase, state, block, tx, totalUsedGas, transientProcess)
if err != nil {
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switch {
case IsNonceErr(err):
return nil, nil, nil, nil, err
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case IsGasLimitErr(err):
return nil, nil, nil, nil, err
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default:
statelogger.Infoln(err)
erroneous = append(erroneous, tx)
err = nil
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}
}
receipts = append(receipts, receipt)
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handled = append(handled, tx)
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cumulativeSum.Add(cumulativeSum, new(big.Int).Mul(txGas, tx.GasPrice()))
}
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block.Reward = cumulativeSum
block.Header().GasUsed = totalUsedGas
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if transientProcess {
go self.eventMux.Post(PendingBlockEvent{block})
}
return receipts, handled, unhandled, erroneous, err
}
// Process block will attempt to process the given block's transactions and applies them
// on top of the block's parent state (given it exists) and will return wether it was
// successful or not.
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func (sm *BlockProcessor) Process(block *types.Block) (td *big.Int, err error) {
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// Processing a blocks may never happen simultaneously
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sm.mutex.Lock()
defer sm.mutex.Unlock()
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header := block.Header()
if sm.bc.HasBlock(header.Hash()) {
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return nil, &KnownBlockError{header.Number, header.Hash()}
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}
if !sm.bc.HasBlock(header.ParentHash) {
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return nil, ParentError(header.ParentHash)
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}
parent := sm.bc.GetBlock(header.ParentHash)
return sm.processWithParent(block, parent)
}
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func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (td *big.Int, err error) {
sm.lastAttemptedBlock = block
// Create a new state based on the parent's root (e.g., create copy)
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state := state.New(parent.Root(), sm.db)
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// Block validation
if err = sm.ValidateBlock(block, parent); err != nil {
return
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}
receipts, err := sm.TransitionState(state, parent, block)
if err != nil {
return
}
header := block.Header()
// Validate the received block's bloom with the one derived from the generated receipts.
// For valid blocks this should always validate to true.
rbloom := types.CreateBloom(receipts)
if bytes.Compare(rbloom, header.Bloom) != 0 {
err = fmt.Errorf("unable to replicate block's bloom=%x", rbloom)
return
}
// The transactions Trie's root (R = (Tr [[H1, T1], [H2, T2], ... [Hn, Tn]]))
// can be used by light clients to make sure they've received the correct Txs
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)
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return
}
// Tre receipt Trie's root (R = (Tr [[H1, R1], ... [Hn, R1]]))
receiptSha := types.DeriveSha(receipts)
if bytes.Compare(receiptSha, header.ReceiptHash) != 0 {
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fmt.Println("receipts", receipts)
err = fmt.Errorf("validating receipt root. received=%x got=%x", header.ReceiptHash, receiptSha)
return
}
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// Accumulate static rewards; block reward, uncle's and uncle inclusion.
if err = sm.AccumulateRewards(state, block, parent); err != nil {
return
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}
// Commit state objects/accounts to a temporary trie (does not save)
// used to calculate the state root.
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
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}
// Calculate the td for this block
td = CalculateTD(block, parent)
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// Sync the current block's state to the database
state.Sync()
// Remove transactions from the pool
sm.txpool.RemoveSet(block.Transactions())
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chainlogger.Infof("processed block #%d (%x...)\n", header.Number, block.Hash()[0:4])
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return td, nil
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}
// 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)
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func (sm *BlockProcessor) ValidateBlock(block, parent *types.Block) error {
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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)
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}
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if block.Time() > time.Now().Unix() {
return fmt.Errorf("block time is in the future")
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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) {
return ValidationError("Block's nonce is invalid (= %v)", ethutil.Bytes2Hex(block.Header().Nonce))
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}
return nil
}
func (sm *BlockProcessor) AccumulateRewards(statedb *state.StateDB, block, parent *types.Block) error {
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reward := new(big.Int).Set(BlockReward)
ancestors := set.New()
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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())) {
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// Error not unique
return UncleError("Uncle not unique")
}
uncles.Add(string(uncle.Hash()))
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if !ancestors.Has(string(uncle.ParentHash)) {
return UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
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}
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if !sm.Pow.Verify(types.NewBlockWithHeader(uncle)) {
return ValidationError("Uncle's nonce is invalid (= %v)", ethutil.Bytes2Hex(uncle.Nonce))
}
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r := new(big.Int)
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
account := statedb.GetAccount(block.Header().Coinbase)
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// Reward amount of ether to the coinbase address
account.AddAmount(reward)
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return nil
}
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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)
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return state.Logs(), nil
}