package vm import ( "errors" "fmt" "math/big" "github.com/ethereum/go-ethereum/ethutil" "github.com/ethereum/go-ethereum/state" ) type Environment interface { State() *state.StateDB Origin() []byte BlockNumber() *big.Int GetHash(n uint64) []byte Coinbase() []byte Time() int64 Difficulty() *big.Int GasLimit() *big.Int Transfer(from, to Account, amount *big.Int) error AddLog(state.Log) VmType() Type Depth() int SetDepth(i int) Call(me ContextRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error) CallCode(me ContextRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error) Create(me ContextRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error, ContextRef) } type Account interface { SubBalance(amount *big.Int) AddBalance(amount *big.Int) Balance() *big.Int } // generic transfer method func Transfer(from, to Account, amount *big.Int) error { if from.Balance().Cmp(amount) < 0 { return errors.New("Insufficient balance in account") } from.SubBalance(amount) to.AddBalance(amount) return nil } type Log struct { address []byte topics [][]byte data []byte log uint64 } func (self *Log) Address() []byte { return self.address } func (self *Log) Topics() [][]byte { return self.topics } func (self *Log) Data() []byte { return self.data } func (self *Log) Number() uint64 { return self.log } func (self *Log) RlpData() interface{} { return []interface{}{self.address, ethutil.ByteSliceToInterface(self.topics), self.data} } func (self *Log) String() string { return fmt.Sprintf("[A=%x T=%x D=%x]", self.address, self.topics, self.data) }