package ethchain import ( "fmt" "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 // 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() contract := state.NewStateObject(addr) contract.initScript = tx.Data contract.state = NewState(ethutil.NewTrie(ethutil.Config.Db, "")) 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.LogLevelInfo, "%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.LogLevelInfo, "%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) 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) } 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() Code { return c.script } // Returns the initialization script func (c *StateObject) Init() Code { 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 }