1 files changed, 81 insertions, 0 deletions
diff --git a/vm/environment.go b/vm/environment.go
new file mode 100644
index 000000000..969bc5e43
--- /dev/null
+++ b/vm/environment.go
@@ -0,0 +1,81 @@
+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
+	PrevHash() []byte
+	Coinbase() []byte
+	Time() int64
+	Difficulty() *big.Int
+	BlockHash() []byte
+	GasLimit() *big.Int
+	Transfer(from, to Account, amount *big.Int) error
+	AddLog(state.Log)
+
+	Depth() int
+	SetDepth(i int)
+
+	Call(me ClosureRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error)
+	CallCode(me ClosureRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error)
+	Create(me ClosureRef, addr, data []byte, gas, price, value *big.Int) ([]byte, error, ClosureRef)
+}
+
+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
+}
+
+type Log struct {
+	address []byte
+	topics  [][]byte
+	data    []byte
+}
+
+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) 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)
+}