plugeth/ethchain/state_manager.go

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package ethchain
import (
"bytes"
"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)
}
type EthManager interface {
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StateManager() *StateManager
BlockChain() *BlockChain
TxPool() *TxPool
Broadcast(msgType ethwire.MsgType, data []interface{})
}
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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
// States for addresses. You can watch any address
// at any given time
addrStateStore *AddrStateStore
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// Stack for processing contracts
stack *Stack
// non-persistent key/value memory storage
mem map[string]*big.Int
Pow PoW
Ethereum EthManager
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SecondaryBlockProcessor BlockProcessor
// The managed states
// Processor state. Anything processed will be applied to this
// state
procState *State
// Comparative state it used for comparing and validating end
// results
compState *State
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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,
addrStateStore: NewAddrStateStore(),
bc: ethereum.BlockChain(),
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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 {
return sm.procState
}
// Watches any given address and puts it in the address state store
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func (sm *StateManager) WatchAddr(addr []byte) *AccountState {
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//XXX account := sm.bc.CurrentBlock.state.GetAccount(addr)
account := sm.procState.GetAccount(addr)
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return sm.addrStateStore.Add(addr, account)
}
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func (sm *StateManager) GetAddrState(addr []byte) *AccountState {
account := sm.addrStateStore.Get(addr)
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if account == nil {
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a := sm.bc.CurrentBlock.state.GetAccount(addr)
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account = &AccountState{Nonce: a.Nonce, Account: a}
}
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return account
}
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func (sm *StateManager) BlockChain() *BlockChain {
return sm.bc
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}
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func (sm *StateManager) MakeContract(tx *Transaction) {
contract := MakeContract(tx, sm.procState)
if contract != nil {
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sm.procState.states[string(tx.Hash()[12:])] = contract.state
}
}
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func (sm *StateManager) ApplyTransactions(block *Block, txs []*Transaction) {
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// Process each transaction/contract
for _, tx := range txs {
// If there's no recipient, it's a contract
if tx.IsContract() {
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sm.MakeContract(tx)
//XXX block.MakeContract(tx)
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} else {
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if contract := sm.procState.GetContract(tx.Recipient); contract != nil {
//XXX if contract := block.state.GetContract(tx.Recipient); contract != nil {
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sm.ProcessContract(contract, tx, block)
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} else {
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err := sm.Ethereum.TxPool().ProcessTransaction(tx, block)
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if err != nil {
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ethutil.Config.Log.Infoln("[STATE]", err)
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}
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}
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}
}
}
// The prepare function, prepares the state manager for the next
// "ProcessBlock" action.
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func (sm *StateManager) Prepare(processer *State, comparative *State) {
sm.compState = comparative
sm.procState = processer
}
// Default prepare function
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func (sm *StateManager) PrepareDefault(block *Block) {
sm.Prepare(sm.BlockChain().CurrentBlock.State(), block.State())
}
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// Block processing and validating with a given (temporarily) state
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func (sm *StateManager) ProcessBlock(block *Block) error {
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// Processing a blocks may never happen simultaneously
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sm.mutex.Lock()
defer sm.mutex.Unlock()
// 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.
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defer sm.bc.CurrentBlock.Undo()
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hash := block.Hash()
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if sm.bc.HasBlock(hash) {
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return nil
}
// Check if we have the parent hash, if it isn't known we discard it
// 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)
}
// 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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return err
}
// I'm not sure, but I don't know if there should be thrown
// any errors at this time.
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if err := sm.AccumelateRewards(block); err != nil {
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return err
}
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// if !sm.compState.Cmp(sm.procState)
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if !sm.compState.Cmp(sm.procState) {
//XXX return fmt.Errorf("Invalid merkle root. Expected %x, got %x", block.State().trie.Root, sm.bc.CurrentBlock.State().trie.Root)
return fmt.Errorf("Invalid merkle root. Expected %x, got %x", sm.compState.trie.Root, sm.procState.trie.Root)
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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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//XXX sm.bc.CurrentBlock.Sync()
sm.procState.Sync()
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// Broadcast the valid block back to the wire
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//sm.Ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
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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
// processing
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if sm.SecondaryBlockProcessor != nil {
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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} else {
fmt.Println("total diff failed")
}
return 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)
}
// 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)")
}
// 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)
}
return base.Add(base, BlockReward)
}
func CalculateUncleReward(block *Block) *big.Int {
return UncleReward
}
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func (sm *StateManager) AccumelateRewards(block *Block) error {
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// Get the coinbase rlp data
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//XXX addr := processor.state.GetAccount(block.Coinbase)
addr := sm.procState.GetAccount(block.Coinbase)
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// Reward amount of ether to the coinbase address
addr.AddFee(CalculateBlockReward(block, len(block.Uncles)))
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//XXX processor.state.UpdateAccount(block.Coinbase, addr)
sm.procState.UpdateAccount(block.Coinbase, addr)
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for _, uncle := range block.Uncles {
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uncleAddr := sm.procState.GetAccount(uncle.Coinbase)
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uncleAddr.AddFee(CalculateUncleReward(uncle))
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//processor.state.UpdateAccount(uncle.Coinbase, uncleAddr)
sm.procState.UpdateAccount(uncle.Coinbase, uncleAddr)
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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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}
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func (sm *StateManager) ProcessContract(contract *Contract, tx *Transaction, block *Block) {
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// Recovering function in case the VM had any errors
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/*
defer func() {
if r := recover(); r != nil {
fmt.Println("Recovered from VM execution with err =", r)
}
}()
*/
caller := sm.procState.GetAccount(tx.Sender())
closure := NewClosure(caller, contract, sm.procState, tx.Gas, tx.Value)
vm := NewVm(sm.procState, RuntimeVars{
origin: caller.Address(),
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blockNumber: block.BlockInfo().Number,
prevHash: block.PrevHash,
coinbase: block.Coinbase,
time: block.Time,
diff: block.Difficulty,
// XXX Tx data? Could be just an argument to the closure instead
txData: nil,
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})
closure.Call(vm, nil)
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}