mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-25 12:57:17 +00:00
304 lines
7.3 KiB
Go
304 lines
7.3 KiB
Go
package ethchain
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"github.com/ethereum/eth-go/ethtrie"
|
|
"github.com/ethereum/eth-go/ethutil"
|
|
"math/big"
|
|
)
|
|
|
|
/*
|
|
* The State transitioning model
|
|
*
|
|
* A state transition is a change made when a transaction is applied to the current world state
|
|
* The state transitioning model does all all the necessary work to work out a valid new state root.
|
|
* 1) Nonce handling
|
|
* 2) Pre pay / buy gas of the coinbase (miner)
|
|
* 3) Create a new state object if the recipient is \0*32
|
|
* 4) Value transfer
|
|
* == If contract creation ==
|
|
* 4a) Attempt to run transaction data
|
|
* 4b) If valid, use result as code for the new state object
|
|
* == end ==
|
|
* 5) Run Script section
|
|
* 6) Derive new state root
|
|
*/
|
|
type StateTransition struct {
|
|
coinbase, receiver []byte
|
|
tx *Transaction
|
|
gas, gasPrice *big.Int
|
|
value *big.Int
|
|
data []byte
|
|
state *State
|
|
block *Block
|
|
|
|
cb, rec, sen *StateObject
|
|
}
|
|
|
|
func NewStateTransition(coinbase *StateObject, tx *Transaction, state *State, block *Block) *StateTransition {
|
|
return &StateTransition{coinbase.Address(), tx.Recipient, tx, new(big.Int), new(big.Int).Set(tx.GasPrice), tx.Value, tx.Data, state, block, coinbase, nil, nil}
|
|
}
|
|
|
|
func (self *StateTransition) Coinbase() *StateObject {
|
|
if self.cb != nil {
|
|
return self.cb
|
|
}
|
|
|
|
self.cb = self.state.GetAccount(self.coinbase)
|
|
return self.cb
|
|
}
|
|
func (self *StateTransition) Sender() *StateObject {
|
|
if self.sen != nil {
|
|
return self.sen
|
|
}
|
|
|
|
self.sen = self.state.GetAccount(self.tx.Sender())
|
|
return self.sen
|
|
}
|
|
func (self *StateTransition) Receiver() *StateObject {
|
|
if self.tx != nil && self.tx.CreatesContract() {
|
|
return nil
|
|
}
|
|
|
|
if self.rec != nil {
|
|
return self.rec
|
|
}
|
|
|
|
self.rec = self.state.GetAccount(self.tx.Recipient)
|
|
return self.rec
|
|
}
|
|
|
|
func (self *StateTransition) MakeStateObject(state *State, tx *Transaction) *StateObject {
|
|
contract := MakeContract(tx, state)
|
|
|
|
return contract
|
|
}
|
|
|
|
func (self *StateTransition) UseGas(amount *big.Int) error {
|
|
if self.gas.Cmp(amount) < 0 {
|
|
return OutOfGasError()
|
|
}
|
|
self.gas.Sub(self.gas, amount)
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *StateTransition) AddGas(amount *big.Int) {
|
|
self.gas.Add(self.gas, amount)
|
|
}
|
|
|
|
func (self *StateTransition) BuyGas() error {
|
|
var err error
|
|
|
|
sender := self.Sender()
|
|
if sender.Amount.Cmp(self.tx.GasValue()) < 0 {
|
|
return fmt.Errorf("Insufficient funds to pre-pay gas. Req %v, has %v", self.tx.GasValue(), sender.Amount)
|
|
}
|
|
|
|
coinbase := self.Coinbase()
|
|
err = coinbase.BuyGas(self.tx.Gas, self.tx.GasPrice)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
self.AddGas(self.tx.Gas)
|
|
sender.SubAmount(self.tx.GasValue())
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *StateTransition) RefundGas() {
|
|
coinbase, sender := self.Coinbase(), self.Sender()
|
|
coinbase.RefundGas(self.gas, self.tx.GasPrice)
|
|
|
|
// Return remaining gas
|
|
remaining := new(big.Int).Mul(self.gas, self.tx.GasPrice)
|
|
sender.AddAmount(remaining)
|
|
}
|
|
|
|
func (self *StateTransition) preCheck() (err error) {
|
|
var (
|
|
tx = self.tx
|
|
sender = self.Sender()
|
|
)
|
|
|
|
// Make sure this transaction's nonce is correct
|
|
if sender.Nonce != tx.Nonce {
|
|
return NonceError(tx.Nonce, sender.Nonce)
|
|
}
|
|
|
|
// Pre-pay gas / Buy gas of the coinbase account
|
|
if err = self.BuyGas(); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *StateTransition) TransitionState() (err error) {
|
|
statelogger.Infof("(~) %x\n", self.tx.Hash())
|
|
|
|
/*
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
logger.Infoln(r)
|
|
err = fmt.Errorf("state transition err %v", r)
|
|
}
|
|
}()
|
|
*/
|
|
|
|
// XXX Transactions after this point are considered valid.
|
|
if err = self.preCheck(); err != nil {
|
|
return
|
|
}
|
|
|
|
var (
|
|
tx = self.tx
|
|
sender = self.Sender()
|
|
receiver *StateObject
|
|
)
|
|
|
|
defer self.RefundGas()
|
|
|
|
// Increment the nonce for the next transaction
|
|
sender.Nonce += 1
|
|
|
|
receiver = self.Receiver()
|
|
|
|
// Transaction gas
|
|
if err = self.UseGas(GasTx); err != nil {
|
|
return
|
|
}
|
|
|
|
// Pay data gas
|
|
dataPrice := big.NewInt(int64(len(self.data)))
|
|
dataPrice.Mul(dataPrice, GasData)
|
|
if err = self.UseGas(dataPrice); err != nil {
|
|
return
|
|
}
|
|
|
|
// If the receiver is nil it's a contract (\0*32).
|
|
if receiver == nil {
|
|
// Create a new state object for the contract
|
|
receiver = self.MakeStateObject(self.state, tx)
|
|
if receiver == nil {
|
|
return fmt.Errorf("Unable to create contract")
|
|
}
|
|
}
|
|
|
|
// Transfer value from sender to receiver
|
|
if err = self.transferValue(sender, receiver); err != nil {
|
|
return
|
|
}
|
|
|
|
// Process the init code and create 'valid' contract
|
|
if IsContractAddr(self.receiver) {
|
|
// Evaluate the initialization script
|
|
// and use the return value as the
|
|
// script section for the state object.
|
|
self.data = nil
|
|
|
|
code, err, deepErr := self.Eval(receiver.Init(), receiver)
|
|
if err != nil || deepErr {
|
|
self.state.ResetStateObject(receiver)
|
|
|
|
return fmt.Errorf("Error during init script run %v (deepErr = %v)", err, deepErr)
|
|
}
|
|
|
|
receiver.script = code
|
|
} else {
|
|
if len(receiver.Script()) > 0 {
|
|
var deepErr bool
|
|
_, err, deepErr = self.Eval(receiver.Script(), receiver)
|
|
if err != nil {
|
|
self.state.ResetStateObject(receiver)
|
|
|
|
return fmt.Errorf("Error during code execution %v (deepErr = %v)", err, deepErr)
|
|
}
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func (self *StateTransition) transferValue(sender, receiver *StateObject) error {
|
|
if sender.Amount.Cmp(self.value) < 0 {
|
|
return fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, sender.Amount)
|
|
}
|
|
|
|
// Subtract the amount from the senders account
|
|
sender.SubAmount(self.value)
|
|
// Add the amount to receivers account which should conclude this transaction
|
|
receiver.AddAmount(self.value)
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *StateTransition) Eval(script []byte, context *StateObject) (ret []byte, err error, deepErr bool) {
|
|
var (
|
|
block = self.block
|
|
initiator = self.Sender()
|
|
state = self.state
|
|
)
|
|
|
|
closure := NewClosure(initiator, context, script, state, self.gas, self.gasPrice)
|
|
vm := NewVm(state, nil, RuntimeVars{
|
|
Origin: initiator.Address(),
|
|
Block: block,
|
|
BlockNumber: block.Number,
|
|
PrevHash: block.PrevHash,
|
|
Coinbase: block.Coinbase,
|
|
Time: block.Time,
|
|
Diff: block.Difficulty,
|
|
Value: self.value,
|
|
})
|
|
vm.Verbose = true
|
|
|
|
ret, err, deepErr = Call(vm, closure, self.data)
|
|
|
|
return
|
|
}
|
|
|
|
func Call(vm *Vm, closure *Closure, data []byte) (ret []byte, err error, deepErr bool) {
|
|
ret, _, err = closure.Call(vm, data)
|
|
deepErr = vm.err != nil
|
|
|
|
Paranoia := ethutil.Config.Paranoia
|
|
if Paranoia {
|
|
var (
|
|
context = closure.object
|
|
trie = context.state.trie
|
|
trie2 = ethtrie.NewTrie(ethutil.Config.Db, "")
|
|
)
|
|
|
|
trie.NewIterator().Each(func(key string, v *ethutil.Value) {
|
|
trie2.Update(key, v.Str())
|
|
})
|
|
|
|
a := ethutil.NewValue(trie2.Root).Bytes()
|
|
b := ethutil.NewValue(context.state.trie.Root).Bytes()
|
|
if bytes.Compare(a, b) != 0 {
|
|
// TODO FIXME ASAP
|
|
context.state.trie = trie2
|
|
/*
|
|
statelogger.Debugf("(o): %x\n", trie.Root)
|
|
trie.NewIterator().Each(func(key string, v *ethutil.Value) {
|
|
v.Decode()
|
|
statelogger.Debugf("%x : %x\n", key, v.Str())
|
|
})
|
|
|
|
statelogger.Debugf("(c): %x\n", trie2.Root)
|
|
trie2.NewIterator().Each(func(key string, v *ethutil.Value) {
|
|
v.Decode()
|
|
statelogger.Debugf("%x : %x\n", key, v.Str())
|
|
})
|
|
*/
|
|
|
|
//return nil, fmt.Errorf("PARANOIA: Different state object roots during copy"), false
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|