plugeth/ethchain/state_object.go

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package ethchain
import (
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"fmt"
"github.com/ethereum/eth-go/ethcrypto"
"github.com/ethereum/eth-go/ethtrie"
"github.com/ethereum/eth-go/ethutil"
"math/big"
"strings"
)
type Code []byte
func (self Code) String() string {
return strings.Join(Disassemble(self), " ")
}
type StateObject struct {
// Address of the object
address []byte
// Shared attributes
Amount *big.Int
ScriptHash []byte
Nonce uint64
// Contract related attributes
state *State
script Code
initScript Code
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storage map[string]*ethutil.Value
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// 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
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// Mark for deletion
// When an object is marked for deletion it will be delete from the trie
// during the "update" phase of the state transition
remove bool
}
func (self *StateObject) Reset() {
self.storage = make(map[string]*ethutil.Value)
}
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// 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()
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contract := state.NewStateObject(addr)
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contract.initScript = tx.Data
contract.state = NewState(ethtrie.NewTrie(ethutil.Config.Db, ""))
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return contract
}
return nil
}
func NewStateObject(addr []byte) *StateObject {
// This to ensure that it has 20 bytes (and not 0 bytes), thus left or right pad doesn't matter.
address := ethutil.LeftPadBytes(addr, 20)
object := &StateObject{address: address, Amount: new(big.Int), gasPool: new(big.Int)}
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object.state = NewState(ethtrie.NewTrie(ethutil.Config.Db, ""))
object.storage = make(map[string]*ethutil.Value)
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return object
}
func NewContract(address []byte, Amount *big.Int, root []byte) *StateObject {
contract := NewStateObject(address)
contract.Amount = Amount
contract.state = NewState(ethtrie.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
}
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func (self *StateObject) MarkForDeletion() {
self.remove = true
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statelogger.Infof("%x: #%d %v (deletion)\n", self.Address(), self.Nonce, self.Amount)
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}
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func (c *StateObject) GetAddr(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 (self *StateObject) GetStorage(key *big.Int) *ethutil.Value {
return self.getStorage(key.Bytes())
}
func (self *StateObject) SetStorage(key *big.Int, value *ethutil.Value) {
self.setStorage(key.Bytes(), value)
}
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func (self *StateObject) getStorage(key []byte) *ethutil.Value {
k := ethutil.LeftPadBytes(key, 32)
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value := self.storage[string(k)]
if value == nil {
value = self.GetAddr(k)
self.storage[string(k)] = value
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}
return value
}
func (self *StateObject) setStorage(key []byte, value *ethutil.Value) {
k := ethutil.LeftPadBytes(key, 32)
self.storage[string(k)] = value
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}
func (self *StateObject) Sync() {
for key, value := range self.storage {
if value.BigInt().Cmp(ethutil.Big0) == 0 {
self.state.trie.Delete(string(key))
continue
}
self.SetAddr([]byte(key), value)
}
}
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()]})
}
func (c *StateObject) AddAmount(amount *big.Int) {
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c.SetAmount(new(big.Int).Add(c.Amount, amount))
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statelogger.Infof("%x: #%d %v (+ %v)\n", c.Address(), c.Nonce, c.Amount, amount)
}
func (c *StateObject) SubAmount(amount *big.Int) {
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c.SetAmount(new(big.Int).Sub(c.Amount, amount))
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statelogger.Infof("%x: #%d %v (- %v)\n", c.Address(), c.Nonce, c.Amount, amount)
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}
func (c *StateObject) SetAmount(amount *big.Int) {
c.Amount = amount
}
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//
// Gas setters and getters
//
// Return the gas back to the origin. Used by the Virtual machine or Closures
func (c *StateObject) ReturnGas(gas, price *big.Int, state *State) {}
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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
}
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func (self *StateObject) SetGasPool(gasLimit *big.Int) {
self.gasPool = new(big.Int).Set(gasLimit)
statelogger.DebugDetailf("%x: fuel (+ %v)", self.Address(), self.gasPool)
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}
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func (self *StateObject) BuyGas(gas, price *big.Int) error {
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if self.gasPool.Cmp(gas) < 0 {
return GasLimitError(self.gasPool, gas)
}
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rGas := new(big.Int).Set(gas)
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rGas.Mul(rGas, price)
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self.AddAmount(rGas)
return nil
}
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func (self *StateObject) RefundGas(gas, price *big.Int) {
self.gasPool.Add(self.gasPool, gas)
rGas := new(big.Int).Set(gas)
rGas.Mul(rGas, price)
self.Amount.Sub(self.Amount, rGas)
}
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func (self *StateObject) Copy() *StateObject {
stateObject := NewStateObject(self.Address())
stateObject.Amount.Set(self.Amount)
stateObject.ScriptHash = ethutil.CopyBytes(self.ScriptHash)
stateObject.Nonce = self.Nonce
if self.state != nil {
stateObject.state = self.state.Copy()
}
stateObject.script = ethutil.CopyBytes(self.script)
stateObject.initScript = ethutil.CopyBytes(self.initScript)
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return stateObject
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}
func (self *StateObject) Set(stateObject *StateObject) {
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*self = *stateObject
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}
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//
// Attribute accessors
//
func (c *StateObject) State() *State {
return c.state
}
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func (c *StateObject) N() *big.Int {
return big.NewInt(int64(c.Nonce))
}
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// Returns the address of the contract/account
func (c *StateObject) Address() []byte {
return c.address
}
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// Returns the main script body
func (c *StateObject) Script() Code {
return c.script
}
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// Returns the initialization script
func (c *StateObject) Init() Code {
return c.initScript
}
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//
// Encoding
//
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// 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, ethcrypto.Sha3Bin(c.script)})
}
func (c *StateObject) RlpDecode(data []byte) {
decoder := ethutil.NewValueFromBytes(data)
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c.Nonce = decoder.Get(0).Uint()
c.Amount = decoder.Get(1).BigInt()
c.state = NewState(ethtrie.NewTrie(ethutil.Config.Db, decoder.Get(2).Interface()))
c.storage = make(map[string]*ethutil.Value)
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
}