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package ethchain
import (
"fmt"
"github.com/ethereum/eth-go/ethutil"
"math/big"
)
type StateObject struct {
// Address of the object
address []byte
// Shared attributes
Amount *big.Int
ScriptHash []byte
Nonce uint64
// Contract related attributes
state *State
script []byte
initScript []byte
// Total gas pool is the total amount of gas currently
// left if this object is the coinbase. Gas is directly
// purchased of the coinbase.
gasPool *big.Int
}
// Converts an transaction in to a state object
func MakeContract(tx *Transaction, state *State) *StateObject {
// Create contract if there's no recipient
if tx.IsContract() {
addr := tx.CreationAddress()
value := tx.Value
contract := NewContract(addr, value, ZeroHash256)
contract.initScript = tx.Data
state.UpdateStateObject(contract)
return contract
}
return nil
}
func NewStateObject(addr []byte) *StateObject {
return &StateObject{address: addr, Amount: new(big.Int)}
}
func NewContract(address []byte, Amount *big.Int, root []byte) *StateObject {
contract := &StateObject{address: address, Amount: Amount, Nonce: 0}
contract.state = NewState(ethutil.NewTrie(ethutil.Config.Db, string(root)))
return contract
}
// Returns a newly created account
func NewAccount(address []byte, amount *big.Int) *StateObject {
account := &StateObject{address: address, Amount: amount, Nonce: 0}
return account
}
func NewStateObjectFromBytes(address, data []byte) *StateObject {
object := &StateObject{address: address}
object.RlpDecode(data)
return object
}
func (c *StateObject) State() *State {
return c.state
}
func (c *StateObject) N() *big.Int {
return big.NewInt(int64(c.Nonce))
}
func (c *StateObject) Addr(addr []byte) *ethutil.Value {
return ethutil.NewValueFromBytes([]byte(c.state.trie.Get(string(addr))))
}
func (c *StateObject) SetAddr(addr []byte, value interface{}) {
c.state.trie.Update(string(addr), string(ethutil.NewValue(value).Encode()))
}
func (c *StateObject) SetStorage(num *big.Int, val *ethutil.Value) {
addr := ethutil.BigToBytes(num, 256)
//fmt.Printf("sstore %x => %v\n", addr, val)
c.SetAddr(addr, val)
}
func (c *StateObject) GetStorage(num *big.Int) *ethutil.Value {
nb := ethutil.BigToBytes(num, 256)
return c.Addr(nb)
}
/* DEPRECATED */
func (c *StateObject) GetMem(num *big.Int) *ethutil.Value {
return c.GetStorage(num)
}
func (c *StateObject) GetInstr(pc *big.Int) *ethutil.Value {
if int64(len(c.script)-1) < pc.Int64() {
return ethutil.NewValue(0)
}
return ethutil.NewValueFromBytes([]byte{c.script[pc.Int64()]})
}
// Return the gas back to the origin. Used by the Virtual machine or Closures
func (c *StateObject) ReturnGas(gas, price *big.Int, state *State) {
/*
remainder := new(big.Int).Mul(gas, price)
c.AddAmount(remainder)
*/
}
func (c *StateObject) AddAmount(amount *big.Int) {
c.SetAmount(new(big.Int).Add(c.Amount, amount))
ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "%x: #%d %v (+ %v)\n", c.Address(), c.Nonce, c.Amount, amount)
}
func (c *StateObject) SubAmount(amount *big.Int) {
c.SetAmount(new(big.Int).Sub(c.Amount, amount))
ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "%x: #%d %v (- %v)\n", c.Address(), c.Nonce, c.Amount, amount)
}
func (c *StateObject) SetAmount(amount *big.Int) {
c.Amount = amount
}
func (c *StateObject) ConvertGas(gas, price *big.Int) error {
total := new(big.Int).Mul(gas, price)
if total.Cmp(c.Amount) > 0 {
return fmt.Errorf("insufficient amount: %v, %v", c.Amount, total)
}
c.SubAmount(total)
return nil
}
func (self *StateObject) SetGasPool(gasLimit *big.Int) {
self.gasPool = new(big.Int).Set(gasLimit)
ethutil.Config.Log.Printf(ethutil.LogLevelSystem, "%x fuel (+ %v)", self.Address(), self.gasPool)
}
func (self *StateObject) BuyGas(gas, price *big.Int) error {
if self.gasPool.Cmp(gas) < 0 {
return GasLimitError(self.gasPool, gas)
}
rGas := new(big.Int).Set(gas)
rGas.Mul(rGas, price)
self.AddAmount(rGas)
return nil
}
func (self *StateObject) Copy() *StateObject {
stCopy := &StateObject{}
stCopy.address = make([]byte, len(self.address))
copy(stCopy.address, self.address)
stCopy.Amount = new(big.Int).Set(self.Amount)
stCopy.ScriptHash = make([]byte, len(self.ScriptHash))
copy(stCopy.ScriptHash, self.ScriptHash)
stCopy.Nonce = self.Nonce
if self.state != nil {
stCopy.state = self.state.Copy()
}
stCopy.script = make([]byte, len(self.script))
copy(stCopy.script, self.script)
stCopy.initScript = make([]byte, len(self.initScript))
copy(stCopy.initScript, self.initScript)
return stCopy
}
// Returns the address of the contract/account
func (c *StateObject) Address() []byte {
return c.address
}
// Returns the main script body
func (c *StateObject) Script() []byte {
return c.script
}
// Returns the initialization script
func (c *StateObject) Init() []byte {
return c.initScript
}
// State object encoding methods
func (c *StateObject) RlpEncode() []byte {
var root interface{}
if c.state != nil {
root = c.state.trie.Root
} else {
root = ""
}
return ethutil.Encode([]interface{}{c.Nonce, c.Amount, root, ethutil.Sha3Bin(c.script)})
}
func (c *StateObject) RlpDecode(data []byte) {
decoder := ethutil.NewValueFromBytes(data)
c.Nonce = decoder.Get(0).Uint()
c.Amount = decoder.Get(1).BigInt()
c.state = NewState(ethutil.NewTrie(ethutil.Config.Db, decoder.Get(2).Interface()))
c.ScriptHash = decoder.Get(3).Bytes()
c.script, _ = ethutil.Config.Db.Get(c.ScriptHash)
}
// Storage change object. Used by the manifest for notifying changes to
// the sub channels.
type StorageState struct {
StateAddress []byte
Address []byte
Value *big.Int
}
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