390 lines
11 KiB
Go
390 lines
11 KiB
Go
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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"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 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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}
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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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// States for addresses. You can watch any address
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// at any given time
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stateObjectCache *StateObjectCache
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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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Pow PoW
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Ethereum EthManager
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SecondaryBlockProcessor BlockProcessor
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// The managed states
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// Processor state. Anything processed will be applied to this
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// state
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procState *State
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// Comparative state it used for comparing and validating end
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// results
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compState *State
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manifest *Manifest
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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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stateObjectCache: NewStateObjectCache(),
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bc: ethereum.BlockChain(),
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manifest: NewManifest(),
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}
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sm.procState = ethereum.BlockChain().CurrentBlock.State()
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return sm
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}
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func (sm *StateManager) ProcState() *State {
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return sm.procState
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}
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// Watches any given address and puts it in the address state store
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func (sm *StateManager) WatchAddr(addr []byte) *CachedStateObject {
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//XXX account := sm.bc.CurrentBlock.state.GetAccount(addr)
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account := sm.procState.GetAccount(addr)
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return sm.stateObjectCache.Add(addr, account)
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}
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func (sm *StateManager) GetAddrState(addr []byte) *CachedStateObject {
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account := sm.stateObjectCache.Get(addr)
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if account == nil {
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a := sm.procState.GetAccount(addr)
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account = &CachedStateObject{Nonce: a.Nonce, Object: a}
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}
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return account
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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) MakeContract(tx *Transaction) *StateObject {
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contract := MakeContract(tx, sm.procState)
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if contract != nil {
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sm.procState.states[string(tx.Hash()[12:])] = 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(block *Block, txs []*Transaction) {
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// Process each transaction/contract
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for _, tx := range txs {
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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(tx)
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if contract != nil {
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sm.EvalScript(contract.Init(), contract, tx, block)
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} else {
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ethutil.Config.Log.Infoln("[STATE] Unable to create contract")
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}
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} else {
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ethutil.Config.Log.Infoln("[STATE] contract create:", err)
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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 := sm.procState.GetContract(tx.Recipient)
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if err == nil && len(contract.Script()) > 0 {
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sm.EvalScript(contract.Script(), contract, tx, block)
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} else if err != nil {
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ethutil.Config.Log.Infoln("[STATE] process:", err)
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}
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}
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}
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}
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// The prepare function, prepares the state manager for the next
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// "ProcessBlock" action.
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func (sm *StateManager) Prepare(processor *State, comparative *State) {
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sm.compState = comparative
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sm.procState = processor
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}
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// Default prepare function
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func (sm *StateManager) PrepareDefault(block *Block) {
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sm.Prepare(sm.BlockChain().CurrentBlock.State(), block.State())
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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(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 sm.bc.CurrentBlock.Undo()
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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(sm.bc.CurrentBlock, 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(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(sm.procState) {
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return fmt.Errorf("Invalid merkle root. Expected %x, got %x", sm.compState.trie.Root, sm.procState.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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sm.procState.Sync()
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// Add the block to the chain
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sm.bc.Add(block)
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// If there's a block processor present, pass in the block for further
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// processing
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if sm.SecondaryBlockProcessor != nil {
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sm.SecondaryBlockProcessor.ProcessBlock(block)
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}
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ethutil.Config.Log.Infof("[STATE] Added block #%d (%x)\n", block.BlockInfo().Number, block.Hash())
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if dontReact == false {
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sm.Ethereum.Reactor().Post("newBlock", block)
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sm.notifyChanges()
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sm.manifest.Reset()
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}
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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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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(block *Block) error {
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// Get the account associated with the coinbase
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account := sm.procState.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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sm.procState.UpdateStateObject(account)
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for _, uncle := range block.Uncles {
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uncleAccount := sm.procState.GetAccount(uncle.Coinbase)
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uncleAccount.AddAmount(CalculateUncleReward(uncle))
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sm.procState.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(script []byte, object *StateObject, tx *Transaction, block *Block) {
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account := sm.procState.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, sm.procState, tx.Gas, tx.GasPrice, tx.Value)
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vm := NewVm(sm.procState, 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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//Price: tx.GasPrice,
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})
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closure.Call(vm, tx.Data, nil)
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// Update the account (refunds)
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sm.procState.UpdateStateObject(account)
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sm.manifest.AddObjectChange(account)
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sm.procState.UpdateStateObject(object)
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sm.manifest.AddObjectChange(object)
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}
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func (sm *StateManager) notifyChanges() {
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for addr, stateObject := range sm.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 sm.manifest.storageChanges {
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for addr, value := range mappedObjects {
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sm.Ethereum.Reactor().Post("storage:"+stateObjectAddr+":"+addr, value.String())
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}
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}
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}
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type Manifest struct {
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// XXX These will be handy in the future. Not important for now.
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objectAddresses map[string]bool
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storageAddresses map[string]map[string]bool
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objectChanges map[string]*StateObject
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storageChanges map[string]map[string]*big.Int
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}
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func NewManifest() *Manifest {
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m := &Manifest{objectAddresses: make(map[string]bool), storageAddresses: make(map[string]map[string]bool)}
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m.Reset()
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return m
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}
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func (m *Manifest) Reset() {
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m.objectChanges = make(map[string]*StateObject)
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m.storageChanges = make(map[string]map[string]*big.Int)
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}
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func (m *Manifest) AddObjectChange(stateObject *StateObject) {
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m.objectChanges[string(stateObject.Address())] = stateObject
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}
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func (m *Manifest) AddStorageChange(stateObject *StateObject, storageAddr []byte, storage *big.Int) {
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if m.storageChanges[string(stateObject.Address())] == nil {
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m.storageChanges[string(stateObject.Address())] = make(map[string]*big.Int)
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}
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m.storageChanges[string(stateObject.Address())][string(storageAddr)] = storage
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}
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