plugeth/core/vm/environment.go

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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
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//
// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
import (
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"errors"
"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
)
// Environment is is required by the virtual machine to get information from
// it's own isolated environment. For an example see `core.VMEnv`
type Environment interface {
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State() *state.StateDB
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Origin() common.Address
BlockNumber() *big.Int
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GetHash(n uint64) common.Hash
Coinbase() common.Address
Time() *big.Int
Difficulty() *big.Int
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GasLimit() *big.Int
CanTransfer(from Account, balance *big.Int) bool
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Transfer(from, to Account, amount *big.Int) error
AddLog(*state.Log)
AddStructLog(StructLog)
StructLogs() []StructLog
VmType() Type
Depth() int
SetDepth(i int)
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Call(me ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)
CallCode(me ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)
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Create(me ContextRef, data []byte, gas, price, value *big.Int) ([]byte, error, ContextRef)
}
// StructLog is emited to the Environment each cycle and lists information about the curent internal state
// prior to the execution of the statement.
type StructLog struct {
Pc uint64
Op OpCode
Gas *big.Int
GasCost *big.Int
Memory []byte
Stack []*big.Int
Storage map[common.Hash][]byte
Err error
}
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type Account interface {
SubBalance(amount *big.Int)
AddBalance(amount *big.Int)
Balance() *big.Int
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Address() common.Address
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}
// 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
}