plugeth/vm/environment.go

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package vm
import (
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"errors"
"math/big"
"github.com/ethereum/eth-go/ethstate"
"github.com/ethereum/eth-go/ethutil"
)
type Environment interface {
State() *ethstate.State
Origin() []byte
BlockNumber() *big.Int
PrevHash() []byte
Coinbase() []byte
Time() int64
Difficulty() *big.Int
BlockHash() []byte
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GasLimit() *big.Int
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Transfer(from, to Account, amount *big.Int) error
}
type Object interface {
GetStorage(key *big.Int) *ethutil.Value
SetStorage(key *big.Int, value *ethutil.Value)
}
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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
}