2014-02-14 14:56:09 -08:00
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package ethchain
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import (
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"bytes"
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"fmt"
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"github.com/ethereum/eth-go/ethutil"
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2014-03-05 01:42:51 -08:00
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"github.com/ethereum/eth-go/ethwire"
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2014-02-14 14:56:09 -08:00
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"math/big"
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"sync"
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"time"
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)
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type BlockProcessor interface {
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ProcessBlock(block *Block)
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}
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2014-03-05 01:42:51 -08:00
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type EthManager interface {
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StateManager() *StateManager
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2014-03-05 01:42:51 -08:00
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BlockChain() *BlockChain
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TxPool() *TxPool
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Broadcast(msgType ethwire.MsgType, data []interface{})
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Reactor() *ethutil.ReactorEngine
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PeerCount() int
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IsMining() bool
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IsListening() bool
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2014-03-05 01:42:51 -08:00
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}
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2014-03-05 01:57:32 -08:00
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type StateManager struct {
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2014-02-14 14:56:09 -08:00
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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 *BlockChain
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// Stack for processing contracts
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stack *Stack
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// non-persistent key/value memory storage
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mem map[string]*big.Int
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2014-05-08 09:41:45 -07:00
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// Proof of work used for validating
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Pow PoW
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// The ethereum manager interface
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Ethereum EthManager
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// The managed states
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// Transiently state. The trans state isn't ever saved, validated and
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// it could be used for setting account nonces without effecting
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// the main states.
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transState *State
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2014-05-17 05:07:52 -07:00
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// Mining state. The mining state is used purely and solely by the mining
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// operation.
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miningState *State
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2014-02-14 14:56:09 -08:00
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}
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2014-03-05 01:57:32 -08:00
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func NewStateManager(ethereum EthManager) *StateManager {
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sm := &StateManager{
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stack: NewStack(),
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mem: make(map[string]*big.Int),
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Pow: &EasyPow{},
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Ethereum: ethereum,
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bc: ethereum.BlockChain(),
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2014-02-14 14:56:09 -08:00
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}
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sm.transState = ethereum.BlockChain().CurrentBlock.State().Copy()
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sm.miningState = ethereum.BlockChain().CurrentBlock.State().Copy()
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2014-05-08 09:26:46 -07:00
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2014-03-05 01:57:32 -08:00
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return sm
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2014-02-14 14:56:09 -08:00
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}
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2014-05-17 05:07:52 -07:00
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func (sm *StateManager) CurrentState() *State {
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return sm.Ethereum.BlockChain().CurrentBlock.State()
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2014-03-05 01:42:51 -08:00
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}
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func (sm *StateManager) TransState() *State {
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return sm.transState
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2014-02-22 16:56:48 -08:00
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}
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2014-05-17 05:07:52 -07:00
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func (sm *StateManager) MiningState() *State {
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return sm.miningState
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}
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func (sm *StateManager) NewMiningState() *State {
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sm.miningState = sm.Ethereum.BlockChain().CurrentBlock.State().Copy()
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return sm.miningState
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}
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2014-03-05 01:57:32 -08:00
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func (sm *StateManager) BlockChain() *BlockChain {
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return sm.bc
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}
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func (sm *StateManager) MakeContract(state *State, tx *Transaction) *StateObject {
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contract := MakeContract(tx, state)
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if contract != nil {
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state.states[string(tx.CreationAddress())] = contract.state
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return contract
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}
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return nil
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2014-03-05 01:42:51 -08:00
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}
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2014-03-30 03:58:37 -07:00
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// Apply transactions uses the transaction passed to it and applies them onto
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// the current processing state.
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func (sm *StateManager) ApplyTransactions(state *State, block *Block, txs []*Transaction) {
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// Process each transaction/contract
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for _, tx := range txs {
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sm.ApplyTransaction(state, block, tx)
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}
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}
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2014-05-21 04:04:40 -07:00
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func (sm *StateManager) ApplyTransaction(state *State, block *Block, tx *Transaction) error {
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// If there's no recipient, it's a contract
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// Check if this is a contract creation traction and if so
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// create a contract of this tx.
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if tx.IsContract() {
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err := sm.Ethereum.TxPool().ProcessTransaction(tx, block, false)
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if err == nil {
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contract := sm.MakeContract(state, tx)
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if contract != nil {
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sm.EvalScript(state, contract.Init(), contract, tx, block)
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} else {
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return fmt.Errorf("[STATE] Unable to create contract")
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}
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} else {
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return fmt.Errorf("[STATE] contract create:", err)
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2014-05-20 15:17:50 -07:00
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}
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} else {
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err := sm.Ethereum.TxPool().ProcessTransaction(tx, block, false)
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contract := state.GetStateObject(tx.Recipient)
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2014-05-21 03:39:07 -07:00
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if err == nil && contract != nil && len(contract.Script()) > 0 {
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sm.EvalScript(state, contract.Script(), contract, tx, block)
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} else if err != nil {
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return fmt.Errorf("[STATE] process:", err)
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}
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}
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return nil
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2014-02-14 14:56:09 -08:00
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}
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2014-05-21 02:42:20 -07:00
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func (sm *StateManager) Process(block *Block, dontReact bool) error {
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if !sm.bc.HasBlock(block.PrevHash) {
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return ParentError(block.PrevHash)
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}
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parent := sm.bc.GetBlock(block.PrevHash)
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return sm.ProcessBlock(parent.State(), parent, block, dontReact)
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}
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2014-02-14 14:56:09 -08:00
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// Block processing and validating with a given (temporarily) state
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func (sm *StateManager) ProcessBlock(state *State, parent, block *Block, dontReact bool) 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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2014-02-14 14:56:09 -08:00
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hash := block.Hash()
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2014-03-05 01:57:32 -08:00
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if sm.bc.HasBlock(hash) {
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2014-04-30 08:13:32 -07:00
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//fmt.Println("[STATE] We already have this block, ignoring")
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return nil
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}
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2014-04-29 03:36:27 -07:00
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// Defer the Undo on the Trie. If the block processing happened
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// we don't want to undo but since undo only happens on dirty
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// nodes this won't happen because Commit would have been called
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// before that.
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defer state.Reset()
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2014-04-29 03:36:27 -07:00
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2014-02-14 14:56:09 -08:00
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// Check if we have the parent hash, if it isn't known we discard it
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// Reasons might be catching up or simply an invalid block
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if !sm.bc.HasBlock(block.PrevHash) && sm.bc.CurrentBlock != nil {
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return ParentError(block.PrevHash)
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}
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// Process the transactions on to current block
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sm.ApplyTransactions(state, parent, block.Transactions())
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// Block validation
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2014-03-05 01:57:32 -08:00
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if err := sm.ValidateBlock(block); err != nil {
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2014-03-24 07:04:29 -07:00
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fmt.Println("[SM] Error validating block:", err)
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2014-02-14 14:56:09 -08:00
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return err
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}
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// I'm not sure, but I don't know if there should be thrown
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// any errors at this time.
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2014-05-17 05:07:52 -07:00
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if err := sm.AccumelateRewards(state, block); err != nil {
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2014-03-24 07:04:29 -07:00
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fmt.Println("[SM] Error accumulating reward", err)
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2014-02-14 14:56:09 -08:00
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return err
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}
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2014-05-17 05:07:52 -07:00
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//if !sm.compState.Cmp(state) {
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if !block.State().Cmp(state) {
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2014-05-21 04:04:40 -07:00
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return fmt.Errorf("Invalid merkle root.\nrec: %x\nis: %x", block.State().trie.Root, state.trie.Root)
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2014-02-14 14:56:09 -08:00
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}
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// Calculate the new total difficulty and sync back to the db
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2014-03-05 01:57:32 -08:00
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if sm.CalculateTD(block) {
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2014-02-17 16:33:26 -08:00
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// Sync the current block's state to the database and cancelling out the deferred Undo
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2014-05-17 05:07:52 -07:00
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state.Sync()
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2014-02-14 14:56:09 -08:00
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2014-02-24 04:50:52 -08:00
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// Add the block to the chain
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2014-03-05 01:57:32 -08:00
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sm.bc.Add(block)
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2014-05-20 05:41:35 -07:00
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sm.notifyChanges(state)
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2014-02-24 04:50:52 -08:00
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2014-05-21 02:42:20 -07:00
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ethutil.Config.Log.Infof("[STATE] Added block #%d (%x)\n", block.Number, block.Hash())
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2014-03-20 03:20:29 -07:00
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if dontReact == false {
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sm.Ethereum.Reactor().Post("newBlock", block)
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2014-04-30 05:43:32 -07:00
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2014-05-17 05:07:52 -07:00
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state.manifest.Reset()
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}
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2014-05-13 08:51:33 -07:00
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sm.Ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
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2014-05-14 07:29:34 -07:00
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2014-05-17 05:07:52 -07:00
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sm.Ethereum.TxPool().RemoveInvalid(state)
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2014-02-14 14:56:09 -08:00
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} else {
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fmt.Println("total diff failed")
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}
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return nil
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}
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2014-03-05 01:57:32 -08:00
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func (sm *StateManager) CalculateTD(block *Block) bool {
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2014-02-14 14:56:09 -08:00
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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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2014-03-05 01:57:32 -08:00
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td = td.Add(sm.bc.TD, uncleDiff)
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2014-02-14 14:56:09 -08:00
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td = td.Add(td, block.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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2014-03-05 01:57:32 -08:00
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if td.Cmp(sm.bc.TD) > 0 {
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2014-02-14 14:56:09 -08:00
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// Set the new total difficulty back to the block chain
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2014-03-05 01:57:32 -08:00
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sm.bc.SetTotalDifficulty(td)
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2014-02-14 14:56:09 -08:00
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return true
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}
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return 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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2014-03-05 01:57:32 -08:00
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func (sm *StateManager) ValidateBlock(block *Block) error {
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2014-02-14 14:56:09 -08:00
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// TODO
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// 2. Check if the difficulty is correct
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// Check each uncle's previous hash. In order for it to be valid
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// is if it has the same block hash as the current
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2014-03-05 01:57:32 -08:00
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previousBlock := sm.bc.GetBlock(block.PrevHash)
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2014-02-14 14:56:09 -08:00
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for _, uncle := range block.Uncles {
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if bytes.Compare(uncle.PrevHash, previousBlock.PrevHash) != 0 {
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return ValidationError("Mismatch uncle's previous hash. Expected %x, got %x", previousBlock.PrevHash, uncle.PrevHash)
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}
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}
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2014-03-05 01:57:32 -08:00
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diff := block.Time - sm.bc.CurrentBlock.Time
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2014-02-14 14:56:09 -08:00
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if diff < 0 {
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return ValidationError("Block timestamp less then prev block %v", diff)
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}
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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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// Verify the nonce of the block. Return an error if it's not valid
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2014-03-05 01:57:32 -08:00
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if !sm.Pow.Verify(block.HashNoNonce(), block.Difficulty, block.Nonce) {
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2014-03-17 03:13:35 -07:00
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return ValidationError("Block's nonce is invalid (= %v)", ethutil.Hex(block.Nonce))
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2014-02-14 14:56:09 -08:00
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}
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return nil
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}
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2014-02-17 16:33:26 -08:00
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func CalculateBlockReward(block *Block, uncleLength int) *big.Int {
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base := new(big.Int)
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for i := 0; i < uncleLength; i++ {
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base.Add(base, UncleInclusionReward)
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}
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return base.Add(base, BlockReward)
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}
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func CalculateUncleReward(block *Block) *big.Int {
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return UncleReward
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}
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2014-05-17 05:07:52 -07:00
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func (sm *StateManager) AccumelateRewards(state *State, block *Block) error {
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2014-04-15 19:06:51 -07:00
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// Get the account associated with the coinbase
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2014-05-17 05:07:52 -07:00
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account := state.GetAccount(block.Coinbase)
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2014-02-14 14:56:09 -08:00
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// Reward amount of ether to the coinbase address
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2014-04-15 19:06:51 -07:00
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account.AddAmount(CalculateBlockReward(block, len(block.Uncles)))
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2014-02-14 14:56:09 -08:00
|
|
|
|
2014-04-09 07:04:36 -07:00
|
|
|
addr := make([]byte, len(block.Coinbase))
|
|
|
|
copy(addr, block.Coinbase)
|
2014-05-17 05:07:52 -07:00
|
|
|
state.UpdateStateObject(account)
|
2014-02-14 14:56:09 -08:00
|
|
|
|
2014-02-17 16:33:26 -08:00
|
|
|
for _, uncle := range block.Uncles {
|
2014-05-17 05:07:52 -07:00
|
|
|
uncleAccount := state.GetAccount(uncle.Coinbase)
|
2014-04-15 19:06:51 -07:00
|
|
|
uncleAccount.AddAmount(CalculateUncleReward(uncle))
|
2014-02-17 16:33:26 -08:00
|
|
|
|
2014-05-17 05:07:52 -07:00
|
|
|
state.UpdateStateObject(uncleAccount)
|
2014-02-17 16:33:26 -08:00
|
|
|
}
|
2014-02-14 14:56:09 -08:00
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2014-03-05 01:57:32 -08:00
|
|
|
func (sm *StateManager) Stop() {
|
|
|
|
sm.bc.Stop()
|
2014-02-14 14:56:09 -08:00
|
|
|
}
|
|
|
|
|
2014-05-17 05:07:52 -07:00
|
|
|
func (sm *StateManager) EvalScript(state *State, script []byte, object *StateObject, tx *Transaction, block *Block) {
|
|
|
|
account := state.GetAccount(tx.Sender())
|
2014-04-25 17:11:00 -07:00
|
|
|
|
|
|
|
err := account.ConvertGas(tx.Gas, tx.GasPrice)
|
|
|
|
if err != nil {
|
|
|
|
ethutil.Config.Log.Debugln(err)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
2014-05-17 05:07:52 -07:00
|
|
|
closure := NewClosure(account, object, script, state, tx.Gas, tx.GasPrice)
|
|
|
|
vm := NewVm(state, sm, RuntimeVars{
|
2014-04-25 17:11:00 -07:00
|
|
|
Origin: account.Address(),
|
2014-04-11 10:29:57 -07:00
|
|
|
BlockNumber: block.BlockInfo().Number,
|
|
|
|
PrevHash: block.PrevHash,
|
|
|
|
Coinbase: block.Coinbase,
|
|
|
|
Time: block.Time,
|
|
|
|
Diff: block.Difficulty,
|
2014-05-07 02:05:49 -07:00
|
|
|
Value: tx.Value,
|
2014-04-18 04:41:07 -07:00
|
|
|
//Price: tx.GasPrice,
|
2014-02-14 14:56:09 -08:00
|
|
|
})
|
2014-04-23 06:53:53 -07:00
|
|
|
closure.Call(vm, tx.Data, nil)
|
2014-04-01 01:41:30 -07:00
|
|
|
|
|
|
|
// Update the account (refunds)
|
2014-05-17 05:07:52 -07:00
|
|
|
state.UpdateStateObject(account)
|
|
|
|
state.UpdateStateObject(object)
|
2014-04-25 16:47:55 -07:00
|
|
|
}
|
|
|
|
|
2014-05-17 05:07:52 -07:00
|
|
|
func (sm *StateManager) notifyChanges(state *State) {
|
|
|
|
for addr, stateObject := range state.manifest.objectChanges {
|
2014-04-30 05:43:32 -07:00
|
|
|
sm.Ethereum.Reactor().Post("object:"+addr, stateObject)
|
2014-04-25 16:47:55 -07:00
|
|
|
}
|
2014-04-30 05:43:32 -07:00
|
|
|
|
2014-05-17 05:07:52 -07:00
|
|
|
for stateObjectAddr, mappedObjects := range state.manifest.storageChanges {
|
2014-04-30 05:43:32 -07:00
|
|
|
for addr, value := range mappedObjects {
|
2014-05-05 02:56:25 -07:00
|
|
|
sm.Ethereum.Reactor().Post("storage:"+stateObjectAddr+":"+addr, &StorageState{[]byte(stateObjectAddr), []byte(addr), value})
|
2014-04-30 05:43:32 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|