mirror of https://github.com/ethereum/go-ethereum
obscuren
11 years ago
commit
5a0e751736
@ -0,0 +1,236 @@ |
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package ethchain |
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|
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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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"math/big" |
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) |
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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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|
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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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|
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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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|
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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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|
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func (self *StateManager) ProcessTransaction(tx *Transaction, coinbase *StateObject, state *State, toContract bool) (gas *big.Int, err error) { |
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fmt.Printf("state root before update %x\n", state.Root()) |
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defer func() { |
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if r := recover(); r != nil { |
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ethutil.Config.Log.Infoln(r) |
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err = fmt.Errorf("%v", r) |
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} |
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}() |
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|
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gas = new(big.Int) |
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addGas := func(g *big.Int) { gas.Add(gas, g) } |
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addGas(GasTx) |
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// Get the sender
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sender := state.GetAccount(tx.Sender()) |
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if sender.Nonce != tx.Nonce { |
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err = NonceError(tx.Nonce, sender.Nonce) |
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return |
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} |
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sender.Nonce += 1 |
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defer func() { |
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//state.UpdateStateObject(sender)
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// Notify all subscribers
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self.Ethereum.Reactor().Post("newTx:post", tx) |
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}() |
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txTotalBytes := big.NewInt(int64(len(tx.Data))) |
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//fmt.Println("txTotalBytes", txTotalBytes)
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//txTotalBytes.Div(txTotalBytes, ethutil.Big32)
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addGas(new(big.Int).Mul(txTotalBytes, GasData)) |
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rGas := new(big.Int).Set(gas) |
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rGas.Mul(gas, tx.GasPrice) |
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// Make sure there's enough in the sender's account. Having insufficient
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// funds won't invalidate this transaction but simple ignores it.
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totAmount := new(big.Int).Add(tx.Value, rGas) |
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if sender.Amount.Cmp(totAmount) < 0 { |
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state.UpdateStateObject(sender) |
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err = fmt.Errorf("[TXPL] Insufficient amount in sender's (%x) account", tx.Sender()) |
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return |
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} |
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coinbase.BuyGas(gas, tx.GasPrice) |
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state.UpdateStateObject(coinbase) |
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fmt.Printf("1. root %x\n", state.Root()) |
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|
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// Get the receiver
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receiver := state.GetAccount(tx.Recipient) |
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// Send Tx to self
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if bytes.Compare(tx.Recipient, tx.Sender()) == 0 { |
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// Subtract the fee
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sender.SubAmount(rGas) |
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} else { |
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// Subtract the amount from the senders account
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sender.SubAmount(totAmount) |
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state.UpdateStateObject(sender) |
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fmt.Printf("3. root %x\n", state.Root()) |
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// Add the amount to receivers account which should conclude this transaction
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receiver.AddAmount(tx.Value) |
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state.UpdateStateObject(receiver) |
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fmt.Printf("2. root %x\n", state.Root()) |
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} |
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ethutil.Config.Log.Infof("[TXPL] Processed Tx %x\n", tx.Hash()) |
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return |
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} |
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|
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func (sm *StateManager) ApplyTransaction(coinbase []byte, 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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snapshot := state.Snapshot() |
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ca := state.GetAccount(coinbase) |
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// Apply the transaction to the current state
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gas, err = sm.ProcessTransaction(tx, ca, state, false) |
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addTotalGas(gas) |
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fmt.Println("gas used by tx", 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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fmt.Println(Disassemble(contract.Init())) |
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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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fmt.Println("gas used by eval", gas) |
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addTotalGas(gas) |
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fmt.Println("total =", totalGasUsed) |
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fmt.Println("script len =", len(script)) |
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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 for sender %x", err, tx.Sender()) |
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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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parent := sm.bc.GetBlock(block.PrevHash) |
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total := new(big.Int).Add(block.GasUsed, totalGasUsed) |
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limit := block.CalcGasLimit(parent) |
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if total.Cmp(limit) > 0 { |
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state.Revert(snapshot) |
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err = GasLimitError(total, limit) |
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} |
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return |
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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(coinbase []byte, 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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var ignoredTxs []*Transaction // Transactions which go over the gasLimit
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totalUsedGas := big.NewInt(0) |
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for _, tx := range txs { |
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usedGas, err := sm.ApplyTransaction(coinbase, 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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if IsGasLimitErr(err) { |
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ignoredTxs = append(ignoredTxs, tx) |
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// We need to figure out if we want to do something with thse txes
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ethutil.Config.Log.Debugln("Gastlimit:", 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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fmt.Println("################# MADE\n", receipts, "\n############################") |
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// Update the total gas used for the block (to be mined)
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block.GasUsed = totalUsedGas |
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return receipts, validTxs |
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} |
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@ -0,0 +1,260 @@ |
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package ethchain |
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import ( |
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"fmt" |
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"github.com/ethereum/eth-go/ethutil" |
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"math/big" |
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) |
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|
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/* |
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* The State transitioning model |
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* |
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* A state transition is a change made when a transaction is applied to the current world state |
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* The state transitioning model does all all the necessary work to work out a valid new state root. |
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* 1) Nonce handling |
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* 2) Pre pay / buy gas of the coinbase (miner) |
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* 3) Create a new state object if the recipient is \0*32 |
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* 4) Value transfer |
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* == If contract creation == |
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* 4a) Attempt to run transaction data |
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* 4b) If valid, use result as code for the new state object |
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* == end == |
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* 5) Run Script section |
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* 6) Derive new state root |
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*/ |
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type StateTransition struct { |
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coinbase []byte |
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tx *Transaction |
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gas *big.Int |
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state *State |
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block *Block |
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cb, rec, sen *StateObject |
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} |
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func NewStateTransition(coinbase *StateObject, tx *Transaction, state *State, block *Block) *StateTransition { |
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return &StateTransition{coinbase.Address(), tx, new(big.Int), state, block, coinbase, nil, nil} |
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} |
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func (self *StateTransition) Coinbase() *StateObject { |
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if self.cb != nil { |
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return self.cb |
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} |
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self.cb = self.state.GetAccount(self.coinbase) |
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return self.cb |
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} |
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func (self *StateTransition) Sender() *StateObject { |
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if self.sen != nil { |
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return self.sen |
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} |
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self.sen = self.state.GetAccount(self.tx.Sender()) |
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return self.sen |
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} |
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func (self *StateTransition) Receiver() *StateObject { |
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if self.tx.CreatesContract() { |
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return nil |
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} |
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if self.rec != nil { |
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return self.rec |
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} |
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self.rec = self.state.GetAccount(self.tx.Recipient) |
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return self.rec |
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} |
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func (self *StateTransition) 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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func (self *StateTransition) UseGas(amount *big.Int) error { |
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if self.gas.Cmp(amount) < 0 { |
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return OutOfGasError() |
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} |
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self.gas.Sub(self.gas, amount) |
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return nil |
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} |
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func (self *StateTransition) AddGas(amount *big.Int) { |
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self.gas.Add(self.gas, amount) |
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} |
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func (self *StateTransition) BuyGas() error { |
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var err error |
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sender := self.Sender() |
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if sender.Amount.Cmp(self.tx.GasValue()) < 0 { |
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return fmt.Errorf("Insufficient funds to pre-pay gas. Req %v, has %v", self.tx.GasValue(), self.tx.Value) |
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} |
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coinbase := self.Coinbase() |
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err = coinbase.BuyGas(self.tx.Gas, self.tx.GasPrice) |
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if err != nil { |
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return err |
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} |
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//self.state.UpdateStateObject(coinbase)
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self.AddGas(self.tx.Gas) |
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sender.SubAmount(self.tx.GasValue()) |
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return nil |
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} |
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func (self *StateTransition) RefundGas() { |
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coinbase, sender := self.Coinbase(), self.Sender() |
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coinbase.RefundGas(self.gas, self.tx.GasPrice) |
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// Return remaining gas
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remaining := new(big.Int).Mul(self.gas, self.tx.GasPrice) |
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sender.AddAmount(remaining) |
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} |
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func (self *StateTransition) TransitionState() (err error) { |
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//snapshot := st.state.Snapshot()
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/* |
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defer func() { |
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if r := recover(); r != nil { |
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ethutil.Config.Log.Infoln(r) |
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err = fmt.Errorf("state transition err %v", r) |
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} |
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}() |
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*/ |
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var ( |
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tx = self.tx |
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sender = self.Sender() |
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receiver *StateObject |
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) |
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// Make sure this transaction's nonce is correct
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if sender.Nonce != tx.Nonce { |
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return NonceError(tx.Nonce, sender.Nonce) |
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} |
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|
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// Pre-pay gas / Buy gas of the coinbase account
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if err = self.BuyGas(); err != nil { |
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return err |
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} |
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// XXX Transactions after this point are considered valid.
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defer func() { |
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self.RefundGas() |
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if sender != nil { |
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self.state.UpdateStateObject(sender) |
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} |
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if receiver != nil { |
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self.state.UpdateStateObject(receiver) |
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} |
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self.state.UpdateStateObject(self.Coinbase()) |
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}() |
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// Increment the nonce for the next transaction
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sender.Nonce += 1 |
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// Get the receiver (TODO fix this, if coinbase is the receiver we need to save/retrieve)
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receiver = self.Receiver() |
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// Transaction gas
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if err = self.UseGas(GasTx); err != nil { |
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return err |
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} |
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|
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// Pay data gas
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dataPrice := big.NewInt(int64(len(tx.Data))) |
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dataPrice.Mul(dataPrice, GasData) |
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if err = self.UseGas(dataPrice); err != nil { |
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return err |
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} |
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// If the receiver is nil it's a contract (\0*32).
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if receiver == nil { |
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// Create a new state object for the contract
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receiver = self.MakeStateObject(self.state, tx) |
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if receiver == nil { |
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return fmt.Errorf("ERR. Unable to create contract with transaction %v", tx) |
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} |
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} |
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|
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// Transfer value from sender to receiver
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if err = self.transferValue(sender, receiver); err != nil { |
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return err |
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} |
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|
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// Process the init code and create 'valid' contract
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if tx.CreatesContract() { |
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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.Eval(state, contract.Init(), contract, tx, block)
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code, err := self.Eval(receiver.Init(), receiver) |
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if err != nil { |
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return fmt.Errorf("Error during init script run %v", err) |
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} |
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|
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receiver.script = code |
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} else { |
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if len(receiver.Script()) > 0 { |
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_, err := self.Eval(receiver.Script(), receiver) |
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if err != nil { |
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return fmt.Errorf("Error during code execution %v", err) |
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} |
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} |
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} |
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|
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return nil |
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} |
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|
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func (self *StateTransition) transferValue(sender, receiver *StateObject) error { |
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if sender.Amount.Cmp(self.tx.Value) < 0 { |
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return fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.tx.Value, sender.Amount) |
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} |
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|
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if self.tx.Value.Cmp(ethutil.Big0) > 0 { |
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// Subtract the amount from the senders account
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sender.SubAmount(self.tx.Value) |
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// Add the amount to receivers account which should conclude this transaction
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receiver.AddAmount(self.tx.Value) |
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|
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ethutil.Config.Log.Debugf("%x => %x (%v) %x\n", sender.Address()[:4], receiver.Address()[:4], self.tx.Value, self.tx.Hash()) |
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} |
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|
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return nil |
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} |
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|
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func (self *StateTransition) Eval(script []byte, context *StateObject) (ret []byte, err error) { |
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var ( |
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tx = self.tx |
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block = self.block |
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initiator = self.Sender() |
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state = self.state |
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) |
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|
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closure := NewClosure(initiator, context, script, state, self.gas, tx.GasPrice) |
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vm := NewVm(state, nil, RuntimeVars{ |
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Origin: initiator.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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}) |
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ret, _, err = closure.Call(vm, tx.Data, nil) |
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|
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return |
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} |
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Reference in new issue