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package core
import (
"math/big"
"time"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/state"
"github.com/ethereum/go-ethereum/vm"
)
type Execution struct {
env vm.Environment
address, input []byte
Gas, price, value *big.Int
}
func NewExecution(env vm.Environment, address, input []byte, gas, gasPrice, value *big.Int) *Execution {
return &Execution{env: env, address: address, input: input, Gas: gas, price: gasPrice, value: value}
}
func (self *Execution) Addr() []byte {
return self.address
}
func (self *Execution) Call(codeAddr []byte, caller vm.ContextRef) ([]byte, error) {
// Retrieve the executing code
var code []byte
if self.env.State().GetStateObject(codeAddr) != nil {
code = self.env.State().GetCode(codeAddr)
}
return self.exec(code, codeAddr, caller)
}
func (self *Execution) exec(code, contextAddr []byte, caller vm.ContextRef) (ret []byte, err error) {
env := self.env
evm := vm.NewVm(env)
if env.Depth() == vm.MaxCallDepth {
caller.ReturnGas(self.Gas, self.price)
return nil, vm.DepthError{}
}
vsnapshot := env.State().Copy()
if len(self.address) == 0 {
// Generate a new address
nonce := env.State().GetNonce(caller.Address())
self.address = crypto.CreateAddress(caller.Address(), nonce)
env.State().SetNonce(caller.Address(), nonce+1)
}
from, to := env.State().GetStateObject(caller.Address()), env.State().GetOrNewStateObject(self.address)
err = env.Transfer(from, to, self.value)
if err != nil {
env.State().Set(vsnapshot)
caller.ReturnGas(self.Gas, self.price)
return nil, ValueTransferErr("insufficient funds to transfer value. Req %v, has %v", self.value, from.Balance())
}
snapshot := env.State().Copy()
start := time.Now()
ret, err = evm.Run(to, caller, code, self.value, self.Gas, self.price, self.input)
chainlogger.Debugf("vm took %v\n", time.Since(start))
if err != nil {
env.State().Set(snapshot)
}
return
}
func (self *Execution) Create(caller vm.ContextRef) (ret []byte, err error, account *state.StateObject) {
ret, err = self.exec(self.input, nil, caller)
account = self.env.State().GetStateObject(self.address)
return
}
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