func (self *StateTransition) transferValue(sender, receiver *ethstate.StateObject) error {
if sender.Balance.Cmp(self.value) < 0 {
return fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, sender.Balance)
}
// 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) 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 *ethstate.StateObject
)
defer self.RefundGas()
// Increment the nonce for the next transaction
sender.Nonce += 1
// Transaction gas
if err = self.UseGas(ethvm.GasTx); err != nil {
return
}
// Pay data gas
dataPrice := big.NewInt(int64(len(self.data)))
dataPrice.Mul(dataPrice, ethvm.GasData)
if err = self.UseGas(dataPrice); err != nil {
return
}
if sender.Balance.Cmp(self.value) < 0 {
return fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, sender.Balance)
}
var snapshot *ethstate.State
// If the receiver is nil it's a contract (\0*32).
if tx.CreatesContract() {
// Subtract the (irreversible) amount from the senders account
sender.SubAmount(self.value)
snapshot = self.state.Copy()
// Create a new state object for the contract
receiver = self.MakeStateObject(self.state, tx)
self.rec = receiver
if receiver == nil {
return fmt.Errorf("Unable to create contract")
}
// Add the amount to receivers account which should conclude this transaction
receiver.AddAmount(self.value)
} else {
receiver = self.Receiver()
// 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)
snapshot = self.state.Copy()
}
msg := self.state.Manifest().AddMessage(ðstate.Message{
To: receiver.Address(), From: sender.Address(),
Input: self.tx.Data,
Origin: sender.Address(),
Block: self.block.Hash(), Timestamp: self.block.Time, Coinbase: self.block.Coinbase, Number: self.block.Number,
Value: self.value,
})
// 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 := self.Eval(msg, receiver.Init(), receiver, "init")
if err != nil {
self.state.Set(snapshot)
return fmt.Errorf("Error during init execution %v", err)
}
receiver.Code = code
msg.Output = code
} else {
if len(receiver.Code) > 0 {
ret, err := self.Eval(msg, receiver.Code, receiver, "code")
if err != nil {
self.state.Set(snapshot)
return fmt.Errorf("Error during code execution %v", err)
}
msg.Output = ret
}
}
return
}