package core import ( "fmt" "math/big" "github.com/ethereum/go-ethereum/state" "github.com/ethereum/go-ethereum/vm" ) type Execution struct { vm vm.VirtualMachine address, input []byte Gas, price, value *big.Int object *state.StateObject SkipTransfer bool } func NewExecution(env vm.Environment, address, input []byte, gas, gasPrice, value *big.Int) *Execution { evm := vm.New(env, vm.DebugVmTy) return &Execution{vm: evm, 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.ClosureRef) ([]byte, error) { // Retrieve the executing code code := self.vm.Env().State().GetCode(codeAddr) return self.exec(code, codeAddr, caller) } func (self *Execution) exec(code, contextAddr []byte, caller vm.ClosureRef) (ret []byte, err error) { env := self.vm.Env() chainlogger.Debugf("pre state %x\n", env.State().Root()) if self.vm.Env().Depth() == vm.MaxCallDepth { // Consume all gas (by not returning it) and return a depth error return nil, vm.DepthError{} } from, to := env.State().GetStateObject(caller.Address()), env.State().GetOrNewStateObject(self.address) // Skipping transfer is used on testing for the initial call if !self.SkipTransfer { err = env.Transfer(from, to, self.value) if err != nil { caller.ReturnGas(self.Gas, self.price) err = fmt.Errorf("Insufficient funds to transfer value. Req %v, has %v", self.value, from.Balance) return } } snapshot := env.State().Copy() defer func() { if /*vm.IsDepthErr(err) ||*/ vm.IsOOGErr(err) { env.State().Set(snapshot) } chainlogger.Debugf("post state %x\n", env.State().Root()) }() self.object = to ret, err = self.vm.Run(to, caller, code, self.value, self.Gas, self.price, self.input) return } func (self *Execution) Create(caller vm.ClosureRef) (ret []byte, err error, account *state.StateObject) { ret, err = self.exec(self.input, nil, caller) account = self.vm.Env().State().GetStateObject(self.address) return }