package state
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/trie"
)
type Code []byte
func (self Code) String() string {
return string(self) //strings.Join(Disassemble(self), " ")
}
type Storage map[string]*ethutil.Value
func (self Storage) Copy() Storage {
cpy := make(Storage)
for key, value := range self {
// XXX Do we need a 'value' copy or is this sufficient?
cpy[key] = value
}
return cpy
}
type StateObject struct {
db ethutil.Database
// Address of the object
address []byte
// Shared attributes
balance *big.Int
codeHash []byte
Nonce uint64
// Contract related attributes
State *StateDB
Code Code
InitCode Code
storage Storage
// 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
// 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(Storage)
self.State.Reset()
}
func NewStateObject(addr []byte, db ethutil.Database) *StateObject {
// This to ensure that it has 20 bytes (and not 0 bytes), thus left or right pad doesn't matter.
address := ethutil.Address(addr)
object := &StateObject{db: db, address: address, balance: new(big.Int), gasPool: new(big.Int)}
object.State = New(nil, db) //New(trie.New(ethutil.Config.Db, ""))
object.storage = make(Storage)
object.gasPool = new(big.Int)
return object
}
func NewStateObjectFromBytes(address, data []byte, db ethutil.Database) *StateObject {
object := &StateObject{address: address, db: db}
object.RlpDecode(data)
return object
}
func (self *StateObject) MarkForDeletion() {
self.remove = true
statelogger.DebugDetailf("%x: #%d %v (deletion)\n", self.Address(), self.Nonce, self.balance)
}
func (c *StateObject) getAddr(addr []byte) *ethutil.Value {
return ethutil.NewValueFromBytes([]byte(c.State.trie.Get(addr)))
}
func (c *StateObject) setAddr(addr []byte, value interface{}) {
c.State.trie.Update(addr, ethutil.Encode(value))
}
func (self *StateObject) GetStorage(key *big.Int) *ethutil.Value {
return self.GetState(key.Bytes())
}
func (self *StateObject) SetStorage(key *big.Int, value *ethutil.Value) {
self.SetState(key.Bytes(), value)
}
func (self *StateObject) Storage() map[string]*ethutil.Value {
return self.storage
}
func (self *StateObject) GetState(k []byte) *ethutil.Value {
key := ethutil.LeftPadBytes(k, 32)
value := self.storage[string(key)]
if value == nil {
value = self.getAddr(key)
if !value.IsNil() {
self.storage[string(key)] = value
}
}
return value
}
func (self *StateObject) SetState(k []byte, value *ethutil.Value) {
key := ethutil.LeftPadBytes(k, 32)
self.storage[string(key)] = value.Copy()
}
/*
// Iterate over each storage address and yield callback
func (self *StateObject) EachStorage(cb trie.EachCallback) {
// First loop over the uncommit/cached values in storage
for key, value := range self.storage {
// XXX Most iterators Fns as it stands require encoded values
encoded := ethutil.NewValue(value.Encode())
cb(key, encoded)
}
it := self.State.Trie.NewIterator()
it.Each(func(key string, value *ethutil.Value) {
// If it's cached don't call the callback.
if self.storage[key] == nil {
cb(key, value)
}
})
}
*/
func (self *StateObject) Sync() {
for key, value := range self.storage {
if value.Len() == 0 {
self.State.trie.Delete([]byte(key))
continue
}
self.setAddr([]byte(key), value)
}
/*
valid, t2 := trie.ParanoiaCheck(self.State.trie, ethutil.Config.Db)
if !valid {
statelogger.Infof("Warn: PARANOIA: Different state storage root during copy %x vs %x\n", self.State.Root(), t2.Root())
self.State.trie = t2
}
*/
}
func (c *StateObject) GetInstr(pc *big.Int) *ethutil.Value {
if int64(len(c.Code)-1) < pc.Int64() {
return ethutil.NewValue(0)
}
return ethutil.NewValueFromBytes([]byte{c.Code[pc.Int64()]})
}
func (c *StateObject) AddBalance(amount *big.Int) {
c.SetBalance(new(big.Int).Add(c.balance, amount))
statelogger.Debugf("%x: #%d %v (+ %v)\n", c.Address(), c.Nonce, c.balance, amount)
}
func (c *StateObject) AddAmount(amount *big.Int) { c.AddBalance(amount) }
func (c *StateObject) SubBalance(amount *big.Int) {
c.SetBalance(new(big.Int).Sub(c.balance, amount))
statelogger.Debugf("%x: #%d %v (- %v)\n", c.Address(), c.Nonce, c.balance, amount)
}
func (c *StateObject) SubAmount(amount *big.Int) { c.SubBalance(amount) }
func (c *StateObject) SetBalance(amount *big.Int) {
c.balance = amount
}
func (self *StateObject) Balance() *big.Int { return self.balance }
//
// 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) {}
func (c *StateObject) ConvertGas(gas, price *big.Int) error {
total := new(big.Int).Mul(gas, price)
if total.Cmp(c.balance) > 0 {
return fmt.Errorf("insufficient amount: %v, %v", c.balance, total)
}
c.SubAmount(total)
return nil
}
func (self *StateObject) SetGasPool(gasLimit *big.Int) {
self.gasPool = new(big.Int).Set(gasLimit)
statelogger.Debugf("%x: gas (+ %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) RefundGas(gas, price *big.Int) {
self.gasPool.Add(self.gasPool, gas)
rGas := new(big.Int).Set(gas)
rGas.Mul(rGas, price)
self.balance.Sub(self.balance, rGas)
}
func (self *StateObject) Copy() *StateObject {
stateObject := NewStateObject(self.Address(), self.db)
stateObject.balance.Set(self.balance)
stateObject.codeHash = ethutil.CopyBytes(self.codeHash)
stateObject.Nonce = self.Nonce
if self.State != nil {
stateObject.State = self.State.Copy()
}
stateObject.Code = ethutil.CopyBytes(self.Code)
stateObject.InitCode = ethutil.CopyBytes(self.InitCode)
stateObject.storage = self.storage.Copy()
stateObject.gasPool.Set(self.gasPool)
stateObject.remove = self.remove
return stateObject
}
func (self *StateObject) Set(stateObject *StateObject) {
*self = *stateObject
}
//
// Attribute accessors
//
func (c *StateObject) N() *big.Int {
return big.NewInt(int64(c.Nonce))
}
// Returns the address of the contract/account
func (c *StateObject) Address() []byte {
return c.address
}
// Returns the initialization Code
func (c *StateObject) Init() Code {
return c.InitCode
}
func (self *StateObject) Trie() *trie.Trie {
return self.State.trie
}
func (self *StateObject) Root() []byte {
return self.Trie().Root()
}
func (self *StateObject) SetCode(code []byte) {
self.Code = code
}
//
// Encoding
//
// State object encoding methods
func (c *StateObject) RlpEncode() []byte {
return ethutil.Encode([]interface{}{c.Nonce, c.balance, c.Root(), c.CodeHash()})
}
func (c *StateObject) CodeHash() ethutil.Bytes {
return crypto.Sha3(c.Code)
}
func (c *StateObject) RlpDecode(data []byte) {
decoder := ethutil.NewValueFromBytes(data)
c.Nonce = decoder.Get(0).Uint()
c.balance = decoder.Get(1).BigInt()
c.State = New(decoder.Get(2).Bytes(), c.db) //New(trie.New(ethutil.Config.Db, decoder.Get(2).Interface()))
c.storage = make(map[string]*ethutil.Value)
c.gasPool = new(big.Int)
c.codeHash = decoder.Get(3).Bytes()
c.Code, _ = c.db.Get(c.codeHash)
}
// Storage change object. Used by the manifest for notifying changes to
// the sub channels.
type StorageState struct {
StateAddress []byte
Address []byte
Value *big.Int
}
