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-rw-r--r--state/state_object.go339
1 files changed, 339 insertions, 0 deletions
diff --git a/state/state_object.go b/state/state_object.go
new file mode 100644
index 000000000..fb568e543
--- /dev/null
+++ b/state/state_object.go
@@ -0,0 +1,339 @@
+package state
+
+import (
+ "fmt"
+ "math/big"
+
+ "github.com/ethereum/go-ethereum/crypto"
+ "github.com/ethereum/go-ethereum/ethtrie"
+ "github.com/ethereum/go-ethereum/ethutil"
+)
+
+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(ethtrie.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(ethtrie.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 ethtrie.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 { // value.BigInt().Cmp(ethutil.Big0) == 0 {
+ //data := self.getStorage([]byte(key))
+ //fmt.Printf("deleting %x %x 0x%x\n", self.Address(), []byte(key), data)
+ self.State.Trie.Delete(string(key))
+ continue
+ }
+
+ self.SetAddr([]byte(key), value)
+ }
+
+ valid, t2 := ethtrie.ParanoiaCheck(self.State.Trie)
+ if !valid {
+ statelogger.Infof("Warn: PARANOIA: Different state storage root during copy %x vs %x\n", self.State.Trie.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.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
+}
+
+// Debug stuff
+func (self *StateObject) CreateOutputForDiff() {
+ fmt.Printf("%x %x %x %x\n", self.Address(), self.State.Root(), self.balance.Bytes(), self.Nonce)
+ self.EachStorage(func(addr string, value *ethutil.Value) {
+ fmt.Printf("%x %x\n", addr, value.Bytes())
+ })
+}
+
+//
+// Encoding
+//
+
+// 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.balance, root, c.CodeHash()})
+}
+
+func (c *StateObject) CodeHash() ethutil.Bytes {
+ var codeHash []byte
+ if len(c.Code) > 0 {
+ codeHash = crypto.Sha3(c.Code)
+ }
+
+ return codeHash
+}
+
+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(ethtrie.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
+}