418 lines
12 KiB
Go
418 lines
12 KiB
Go
package ethchain
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import (
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"bytes"
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"container/list"
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"fmt"
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"github.com/ethereum/eth-go/ethutil"
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"github.com/ethereum/eth-go/ethwire"
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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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type Peer interface {
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Inbound() bool
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LastSend() time.Time
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LastPong() int64
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Host() []byte
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Port() uint16
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Version() string
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PingTime() string
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Connected() *int32
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}
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type EthManager interface {
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StateManager() *StateManager
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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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Peers() *list.List
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}
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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
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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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// 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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// 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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}
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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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}
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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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return sm
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}
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func (sm *StateManager) CurrentState() *State {
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return sm.Ethereum.BlockChain().CurrentBlock.State()
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}
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func (sm *StateManager) TransState() *State {
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return sm.transState
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}
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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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func (sm *StateManager) BlockChain() *BlockChain {
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return sm.bc
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}
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func (sm *StateManager) MakeStateObject(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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}
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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) ([]*Receipt, []*Transaction) {
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// Process each transaction/contract
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var receipts []*Receipt
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var validTxs []*Transaction
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totalUsedGas := big.NewInt(0)
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for _, tx := range txs {
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usedGas, err := sm.ApplyTransaction(state, block, tx)
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if err != nil {
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if IsNonceErr(err) {
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continue
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}
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ethutil.Config.Log.Infoln(err)
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}
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accumelative := new(big.Int).Set(totalUsedGas.Add(totalUsedGas, usedGas))
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receipt := &Receipt{tx, ethutil.CopyBytes(state.Root().([]byte)), accumelative}
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receipts = append(receipts, receipt)
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validTxs = append(validTxs, tx)
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}
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return receipts, validTxs
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}
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func (sm *StateManager) ApplyTransaction(state *State, block *Block, tx *Transaction) (totalGasUsed *big.Int, err error) {
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/*
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Applies transactions to the given state and creates new
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state objects where needed.
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If said objects needs to be created
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run the initialization script provided by the transaction and
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assume there's a return value. The return value will be set to
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the script section of the state object.
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*/
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var (
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addTotalGas = func(gas *big.Int) { totalGasUsed.Add(totalGasUsed, gas) }
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gas = new(big.Int)
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script []byte
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)
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totalGasUsed = big.NewInt(0)
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// Apply the transaction to the current state
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gas, err = sm.Ethereum.TxPool().ProcessTransaction(tx, state, false)
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addTotalGas(gas)
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if tx.CreatesContract() {
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if err == nil {
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// Create a new state object and the transaction
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// as it's data provider.
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contract := sm.MakeStateObject(state, tx)
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if contract != nil {
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// Evaluate the initialization script
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// and use the return value as the
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// script section for the state object.
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script, gas, err = sm.EvalScript(state, contract.Init(), contract, tx, block)
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addTotalGas(gas)
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if err != nil {
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err = fmt.Errorf("[STATE] Error during init script run %v", err)
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return
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}
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contract.script = script
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state.UpdateStateObject(contract)
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} else {
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err = fmt.Errorf("[STATE] Unable to create contract")
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}
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} else {
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err = fmt.Errorf("[STATE] contract creation tx: %v", err)
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}
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} else {
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// Find the state object at the "recipient" address. If
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// there's an object attempt to run the script.
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stateObject := state.GetStateObject(tx.Recipient)
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if err == nil && stateObject != nil && len(stateObject.Script()) > 0 {
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_, gas, err = sm.EvalScript(state, stateObject.Script(), stateObject, tx, block)
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addTotalGas(gas)
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}
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}
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return
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}
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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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// 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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hash := block.Hash()
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if sm.bc.HasBlock(hash) {
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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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// 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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// 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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if err := sm.ValidateBlock(block); err != nil {
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fmt.Println("[SM] Error validating block:", err)
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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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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
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}
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//if !sm.compState.Cmp(state) {
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if !block.State().Cmp(state) {
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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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}
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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
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state.Sync()
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// Add the block to the chain
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sm.bc.Add(block)
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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 {
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sm.Ethereum.Reactor().Post("newBlock", block)
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state.manifest.Reset()
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}
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sm.Ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
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sm.Ethereum.TxPool().RemoveInvalid(state)
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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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func (sm *StateManager) CalculateTD(block *Block) bool {
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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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td = td.Add(sm.bc.TD, uncleDiff)
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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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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
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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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func (sm *StateManager) ValidateBlock(block *Block) error {
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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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previousBlock := sm.bc.GetBlock(block.PrevHash)
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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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diff := block.Time - sm.bc.CurrentBlock.Time
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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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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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}
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return nil
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}
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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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lastCumulGasUsed := big.NewInt(0)
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for _, r := range block.Receipts() {
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usedGas := new(big.Int).Sub(r.CumulativeGasUsed, lastCumulGasUsed)
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usedGas.Add(usedGas, r.Tx.GasPrice)
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base.Add(base, usedGas)
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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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func (sm *StateManager) AccumelateRewards(state *State, block *Block) error {
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// Get the account associated with the coinbase
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account := state.GetAccount(block.Coinbase)
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// Reward amount of ether to the coinbase address
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account.AddAmount(CalculateBlockReward(block, len(block.Uncles)))
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addr := make([]byte, len(block.Coinbase))
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copy(addr, block.Coinbase)
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state.UpdateStateObject(account)
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for _, uncle := range block.Uncles {
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uncleAccount := state.GetAccount(uncle.Coinbase)
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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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}
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func (sm *StateManager) Stop() {
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sm.bc.Stop()
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}
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func (sm *StateManager) EvalScript(state *State, script []byte, object *StateObject, tx *Transaction, block *Block) (ret []byte, gas *big.Int, err error) {
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account := state.GetAccount(tx.Sender())
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err = account.ConvertGas(tx.Gas, tx.GasPrice)
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if err != nil {
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ethutil.Config.Log.Debugln(err)
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return
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}
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closure := NewClosure(account, object, script, state, tx.Gas, tx.GasPrice)
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vm := NewVm(state, sm, RuntimeVars{
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Origin: account.Address(),
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BlockNumber: block.BlockInfo().Number,
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PrevHash: block.PrevHash,
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Coinbase: block.Coinbase,
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Time: block.Time,
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Diff: block.Difficulty,
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Value: tx.Value,
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//Price: tx.GasPrice,
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})
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ret, gas, err = closure.Call(vm, tx.Data, nil)
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// Update the account (refunds)
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state.UpdateStateObject(account)
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state.UpdateStateObject(object)
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return
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}
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func (sm *StateManager) notifyChanges(state *State) {
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for addr, stateObject := range state.manifest.objectChanges {
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sm.Ethereum.Reactor().Post("object:"+addr, stateObject)
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}
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for stateObjectAddr, mappedObjects := range state.manifest.storageChanges {
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for addr, value := range mappedObjects {
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sm.Ethereum.Reactor().Post("storage:"+stateObjectAddr+":"+addr, &StorageState{[]byte(stateObjectAddr), []byte(addr), value})
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}
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}
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}
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