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 { // Address of the object address []byte // Shared attributes balance *big.Int codeHash []byte Nonce uint64 // Contract related attributes State *State 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) *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{address: address, balance: new(big.Int), gasPool: new(big.Int)} object.State = New(trie.New(ethutil.Config.Db, "")) object.storage = make(Storage) object.gasPool = new(big.Int) return object } func NewContract(address []byte, balance *big.Int, root []byte) *StateObject { contract := NewStateObject(address) contract.balance = balance contract.State = New(trie.New(ethutil.Config.Db, string(root))) return contract } func NewStateObjectFromBytes(address, data []byte) *StateObject { object := &StateObject{address: address} 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(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.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(string(key)) continue } self.SetAddr([]byte(key), value) } valid, t2 := trie.ParanoiaCheck(self.State.Trie) if !valid { statelogger.Infof("Warn: PARANOIA: Different state storage root during copy %x vs %x\n", self.State.Root(), t2.GetRoot()) 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.DebugDetailf("%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) 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()) 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 } // To satisfy ClosureRef func (self *StateObject) Object() *StateObject { return self } func (self *StateObject) Root() []byte { return self.State.Trie.GetRoot() } // // 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(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, _ = ethutil.Config.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 }