plugeth/ethchain/state_manager.go

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package ethchain
import (
"bytes"
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"container/list"
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"fmt"
"github.com/ethereum/eth-go/ethutil"
"github.com/ethereum/eth-go/ethwire"
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"math/big"
"sync"
"time"
)
type BlockProcessor interface {
ProcessBlock(block *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
}
type EthManager interface {
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StateManager() *StateManager
BlockChain() *BlockChain
TxPool() *TxPool
Broadcast(msgType ethwire.MsgType, data []interface{})
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Reactor() *ethutil.ReactorEngine
PeerCount() int
IsMining() bool
IsListening() bool
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Peers() *list.List
}
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type StateManager 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 *BlockChain
// Stack for processing contracts
stack *Stack
// 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
Ethereum 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 *State
// Mining state. The mining state is used purely and solely by the mining
// operation.
miningState *State
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}
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func NewStateManager(ethereum EthManager) *StateManager {
sm := &StateManager{
stack: NewStack(),
mem: make(map[string]*big.Int),
Pow: &EasyPow{},
Ethereum: ethereum,
bc: ethereum.BlockChain(),
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}
sm.transState = ethereum.BlockChain().CurrentBlock.State().Copy()
sm.miningState = ethereum.BlockChain().CurrentBlock.State().Copy()
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return sm
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}
func (sm *StateManager) CurrentState() *State {
return sm.Ethereum.BlockChain().CurrentBlock.State()
}
func (sm *StateManager) TransState() *State {
return sm.transState
}
func (sm *StateManager) MiningState() *State {
return sm.miningState
}
func (sm *StateManager) NewMiningState() *State {
sm.miningState = sm.Ethereum.BlockChain().CurrentBlock.State().Copy()
return sm.miningState
}
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func (sm *StateManager) BlockChain() *BlockChain {
return sm.bc
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}
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func (self *StateManager) ProcessTransactions(coinbase *StateObject, state *State, block, parent *Block, txs Transactions) (Receipts, Transactions, Transactions, error) {
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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)
st := NewStateTransition(coinbase, tx, state, block)
err = st.TransitionState()
if err != nil {
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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:
ethutil.Config.Log.Infoln(err)
}
}
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// Notify all subscribers
self.Ethereum.Reactor().Post("newTx:post", tx)
// Update the state with pending changes
state.Update()
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txGas.Sub(txGas, st.gas)
accumelative := new(big.Int).Set(totalUsedGas.Add(totalUsedGas, txGas))
receipt := &Receipt{tx, ethutil.CopyBytes(state.Root().([]byte)), accumelative}
receipts = append(receipts, receipt)
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handled = append(handled, tx)
}
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parent.GasUsed = totalUsedGas
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return receipts, handled, unhandled, err
}
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func (sm *StateManager) Process(block *Block, dontReact bool) (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()) {
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return nil
}
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if !sm.bc.HasBlock(block.PrevHash) {
return ParentError(block.PrevHash)
}
var (
parent = sm.bc.GetBlock(block.PrevHash)
state = parent.State()
)
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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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receipts, err := sm.ApplyDiff(state, parent, block)
defer func() {
if err != nil {
if len(receipts) == len(block.Receipts()) {
for i, receipt := range block.Receipts() {
ethutil.Config.Log.Debugf("diff (r) %v ~ %x <=> (c) %v ~ %x (%x)\n", receipt.CumulativeGasUsed, receipt.PostState[0:4], receipts[i].CumulativeGasUsed, receipts[i].PostState[0:4], receipt.Tx.Hash())
}
} else {
ethutil.Config.Log.Debugln("Unable to print receipt diff. Length didn't match", len(receipts), "for", len(block.Receipts()))
}
}
}()
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if err != nil {
return err
}
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// Block validation
if err = sm.ValidateBlock(block); err != nil {
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fmt.Println("[SM] Error validating block:", err)
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return err
}
// I'm not sure, but I don't know if there should be thrown
// any errors at this time.
if err = sm.AccumelateRewards(state, block); err != nil {
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fmt.Println("[SM] Error accumulating reward", err)
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return err
}
if !block.State().Cmp(state) {
err = fmt.Errorf("Invalid merkle root.\nrec: %x\nis: %x", block.State().trie.Root, state.trie.Root)
return
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}
// Calculate the new total difficulty and sync back to the db
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if sm.CalculateTD(block) {
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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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// Add the block to the chain
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sm.bc.Add(block)
sm.notifyChanges(state)
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ethutil.Config.Log.Infof("[STATE] Added block #%d (%x)\n", block.Number, block.Hash())
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if dontReact == false {
sm.Ethereum.Reactor().Post("newBlock", block)
state.manifest.Reset()
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}
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sm.Ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
sm.Ethereum.TxPool().RemoveInvalid(state)
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} else {
fmt.Println("total diff failed")
}
return nil
}
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func (sm *StateManager) ApplyDiff(state *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, _, _, _ = sm.ProcessTransactions(coinbase, state, block, parent, block.Transactions())
return receipts, nil
}
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func (sm *StateManager) CalculateTD(block *Block) 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 {
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// Set the new total difficulty back to the block chain
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sm.bc.SetTotalDifficulty(td)
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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)
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func (sm *StateManager) ValidateBlock(block *Block) error {
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// 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
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previousBlock := sm.bc.GetBlock(block.PrevHash)
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for _, uncle := range block.Uncles {
if bytes.Compare(uncle.PrevHash, previousBlock.PrevHash) != 0 {
return ValidationError("Mismatch uncle's previous hash. Expected %x, got %x", previousBlock.PrevHash, uncle.PrevHash)
}
}
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diff := block.Time - sm.bc.CurrentBlock.Time
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if diff < 0 {
return ValidationError("Block timestamp less then prev block %v", diff)
}
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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) {
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return ValidationError("Block's nonce is invalid (= %v)", ethutil.Hex(block.Nonce))
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}
return nil
}
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func CalculateBlockReward(block *Block, uncleLength int) *big.Int {
base := new(big.Int)
for i := 0; i < uncleLength; i++ {
base.Add(base, UncleInclusionReward)
}
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return base.Add(base, BlockReward)
}
func CalculateUncleReward(block *Block) *big.Int {
return UncleReward
}
func (sm *StateManager) AccumelateRewards(state *State, block *Block) error {
// Get the account associated with the coinbase
account := state.GetAccount(block.Coinbase)
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// Reward amount of ether to the coinbase address
account.AddAmount(CalculateBlockReward(block, len(block.Uncles)))
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addr := make([]byte, len(block.Coinbase))
copy(addr, block.Coinbase)
state.UpdateStateObject(account)
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for _, uncle := range block.Uncles {
uncleAccount := state.GetAccount(uncle.Coinbase)
uncleAccount.AddAmount(CalculateUncleReward(uncle))
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state.UpdateStateObject(uncleAccount)
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}
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return nil
}
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func (sm *StateManager) Stop() {
sm.bc.Stop()
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}
func (sm *StateManager) notifyChanges(state *State) {
for addr, stateObject := range state.manifest.objectChanges {
sm.Ethereum.Reactor().Post("object:"+addr, stateObject)
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}
for stateObjectAddr, mappedObjects := range state.manifest.storageChanges {
for addr, value := range mappedObjects {
sm.Ethereum.Reactor().Post("storage:"+stateObjectAddr+":"+addr, &StorageState{[]byte(stateObjectAddr), []byte(addr), value})
}
}
}