package core import ( "fmt" "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 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.New(env, vm.DebugVmTy) 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, fmt.Errorf("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) if err != nil { env.State().Set(snapshot) } chainlogger.Debugf("vm took %v\n", time.Since(start)) 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 }