vm/environment.go


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package vm

import (
    "errors"
    "math/big"

    "github.com/ethereum/go-ethereum/ethutil"
)

type Environment interface {
    //State() *state.State

    Origin() []byte
    BlockNumber() *big.Int
    PrevHash() []byte
    Coinbase() []byte
    Time() int64
    Difficulty() *big.Int
    BlockHash() []byte
    GasLimit() *big.Int

    Transfer(from, to Account, amount *big.Int) error
    AddLog(addr []byte, topics [][]byte, data []byte)
    DeleteAccount(addr []byte)
    SetState(addr, key, value []byte)
    GetState(addr, key []byte) []byte
    Balance(addr []byte) *big.Int
    AddBalance(addr []byte, balance *big.Int)
    GetCode(addr []byte) []byte
    Refund(addr []byte, gas, price *big.Int)
}

type Object interface {
    GetStorage(key *big.Int) *ethutil.Value
    SetStorage(key *big.Int, value *ethutil.Value)
}

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
}