path: root/vm/environment.go

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)
}