plugeth/chain/block_manager.go

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package chain
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import (
"bytes"
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"container/list"
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"errors"
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"fmt"
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"math/big"
"sync"
"time"
"github.com/ethereum/go-ethereum/chain/types"
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"github.com/ethereum/go-ethereum/crypto"
"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/state"
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"github.com/ethereum/go-ethereum/wire"
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)
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var statelogger = logger.NewLogger("BLOCK")
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type Peer interface {
Inbound() bool
LastSend() time.Time
LastPong() int64
Host() []byte
Port() uint16
Version() string
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PingTime() string
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Connected() *int32
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Caps() *ethutil.Value
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}
type EthManager interface {
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BlockManager() *BlockManager
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ChainManager() *ChainManager
TxPool() *TxPool
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Broadcast(msgType wire.MsgType, data []interface{})
PeerCount() int
IsMining() bool
IsListening() bool
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Peers() *list.List
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KeyManager() *crypto.KeyManager
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ClientIdentity() wire.ClientIdentity
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Db() ethutil.Database
EventMux() *event.TypeMux
}
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type BlockManager struct {
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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
// 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.
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transState *state.State
// Mining state. The mining state is used purely and solely by the mining
// operation.
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miningState *state.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 *types.Block
events event.Subscription
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}
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func NewBlockManager(ethereum EthManager) *BlockManager {
sm := &BlockManager{
mem: make(map[string]*big.Int),
Pow: &EasyPow{},
eth: ethereum,
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bc: ethereum.ChainManager(),
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}
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sm.transState = ethereum.ChainManager().CurrentBlock.State().Copy()
sm.miningState = ethereum.ChainManager().CurrentBlock.State().Copy()
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return sm
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}
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func (self *BlockManager) Start() {
statelogger.Debugln("Starting block manager")
}
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func (self *BlockManager) Stop() {
statelogger.Debugln("Stopping state manager")
}
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func (sm *BlockManager) CurrentState() *state.State {
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return sm.eth.ChainManager().CurrentBlock.State()
}
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func (sm *BlockManager) TransState() *state.State {
return sm.transState
}
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func (sm *BlockManager) MiningState() *state.State {
return sm.miningState
}
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func (sm *BlockManager) NewMiningState() *state.State {
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sm.miningState = sm.eth.ChainManager().CurrentBlock.State().Copy()
return sm.miningState
}
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func (sm *BlockManager) ChainManager() *ChainManager {
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return sm.bc
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}
func (self *BlockManager) ProcessTransactions(coinbase *state.StateObject, state *state.State, block, parent *types.Block, txs types.Transactions) (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
)
done:
for i, tx := range txs {
// If we are mining this block and validating we want to set the logs back to 0
state.EmptyLogs()
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txGas := new(big.Int).Set(tx.Gas)
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cb := state.GetStateObject(coinbase.Address())
st := NewStateTransition(cb, tx, state, block)
err = st.TransitionState()
if err != nil {
statelogger.Infoln(err)
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switch {
case IsNonceErr(err):
err = nil // ignore error
continue
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case IsGasLimitErr(err):
unhandled = txs[i:]
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break done
default:
statelogger.Infoln(err)
erroneous = append(erroneous, tx)
err = nil
continue
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}
}
// Update the state with pending changes
state.Update()
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txGas.Sub(txGas, st.gas)
cumulative := new(big.Int).Set(totalUsedGas.Add(totalUsedGas, txGas))
receipt := types.NewReceipt(state.Root(), cumulative)
receipt.SetLogs(state.Logs())
receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
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// Notify all subscribers
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go self.eth.EventMux().Post(TxPostEvent{tx})
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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()
}
}
block.GasUsed = totalUsedGas
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return receipts, handled, unhandled, erroneous, err
}
func (sm *BlockManager) 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()
defer sm.mutex.Unlock()
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if sm.bc.HasBlock(block.Hash()) {
return nil, nil, nil
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}
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if !sm.bc.HasBlock(block.PrevHash) {
return nil, nil, ParentError(block.PrevHash)
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}
parent := sm.bc.GetBlock(block.PrevHash)
return sm.ProcessWithParent(block, parent)
}
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func (sm *BlockManager) ProcessWithParent(block, parent *types.Block) (td *big.Int, messages state.Messages, err error) {
sm.lastAttemptedBlock = block
state := parent.State().Copy()
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// 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()
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if ethutil.Config.Diff && ethutil.Config.DiffType == "all" {
fmt.Printf("## %x %x ##\n", block.Hash(), block.Number)
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}
receipts, err := sm.ApplyDiff(state, parent, block)
if err != nil {
return
}
txSha := types.DeriveSha(block.Transactions())
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if bytes.Compare(txSha, block.TxSha) != 0 {
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err = fmt.Errorf("validating transaction root. received=%x got=%x", block.TxSha, txSha)
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return
}
receiptSha := types.DeriveSha(receipts)
if bytes.Compare(receiptSha, block.ReceiptSha) != 0 {
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err = fmt.Errorf("validating receipt root. received=%x got=%x", block.ReceiptSha, receiptSha)
return
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}
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// Block validation
if err = sm.ValidateBlock(block, parent); err != nil {
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statelogger.Errorln("validating block:", err)
return
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}
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if err = sm.AccumelateRewards(state, block, parent); err != nil {
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statelogger.Errorln("accumulating reward", err)
return
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}
//block.receipts = receipts // although this isn't necessary it be in the future
rbloom := types.CreateBloom(receipts)
if bytes.Compare(rbloom, block.LogsBloom) != 0 {
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err = fmt.Errorf("unable to replicate block's bloom=%x", rbloom)
return
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}
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state.Update()
if !block.State().Cmp(state) {
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err = fmt.Errorf("invalid merkle root. received=%x got=%x", block.Root(), state.Root())
return
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}
// Calculate the new total difficulty and sync back to the db
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
state.Sync()
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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", block.Number, block.Hash()[0:4])
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sm.transState = state.Copy()
sm.eth.TxPool().RemoveSet(block.Transactions())
return td, messages, nil
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} else {
return nil, nil, errors.New("total diff failed")
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}
}
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func (sm *BlockManager) ApplyDiff(state *state.State, parent, block *types.Block) (receipts types.Receipts, err error) {
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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())
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if err != nil {
return nil, err
}
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return receipts, nil
}
func (sm *BlockManager) CalculateTD(block *types.Block) (*big.Int, bool) {
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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)
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td = td.Add(sm.bc.TD, uncleDiff)
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td = td.Add(td, block.Difficulty)
// The new TD will only be accepted if the new difficulty is
// is greater than the previous.
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if td.Cmp(sm.bc.TD) > 0 {
return td, true
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// Set the new total difficulty back to the block chain
//sm.bc.SetTotalDifficulty(td)
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}
return nil, false
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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)
func (sm *BlockManager) ValidateBlock(block, parent *types.Block) error {
expd := CalcDifficulty(block, parent)
if expd.Cmp(block.Difficulty) < 0 {
return fmt.Errorf("Difficulty check failed for block %v, %v", block.Difficulty, expd)
}
diff := block.Time - parent.Time
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if diff < 0 {
return ValidationError("Block timestamp less then prev block %v (%v - %v)", diff, block.Time, sm.bc.CurrentBlock.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.
if diff > int64(15*time.Minute) {
return ValidationError("Block is too far in the future of last block (> 15 minutes)")
}
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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.HashNoNonce(), block.Difficulty, block.Nonce) {
return ValidationError("Block's nonce is invalid (= %v)", ethutil.Bytes2Hex(block.Nonce))
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}
return nil
}
func (sm *BlockManager) AccumelateRewards(state *state.State, block, parent *types.Block) error {
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reward := new(big.Int).Set(BlockReward)
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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")
}
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uncleParent := sm.bc.GetBlock(uncle.PrevHash)
if uncleParent == nil {
return UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.PrevHash[0:4]))
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}
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if uncleParent.Number.Cmp(new(big.Int).Sub(parent.Number, big.NewInt(6))) < 0 {
return UncleError("Uncle too old")
}
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if knownUncles.Include(uncle.Hash()) {
return UncleError("Uncle in chain")
}
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nonces.Insert(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 := state.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 := state.GetAccount(block.Coinbase)
// Reward amount of ether to the coinbase address
account.AddAmount(reward)
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return nil
}
func (sm *BlockManager) GetMessages(block *types.Block) (messages []*state.Message, err error) {
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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)
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sm.AccumelateRewards(state, block, parent)
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return state.Manifest().Messages, nil
}