1 files changed, 359 insertions, 0 deletions
diff --git a/state/state_object.go b/state/state_object.go
new file mode 100644
index 000000000..cdb9abf79
--- /dev/null
+++ b/state/state_object.go
@@ -0,0 +1,359 @@
+package state
+
+import (
+	"bytes"
+	"fmt"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/rlp"
+	"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]*common.Value
+
+func (self Storage) String() (str string) {
+	for key, value := range self {
+		str += fmt.Sprintf("%X : %X\n", key, value.Bytes())
+	}
+
+	return
+}
+
+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 {
+	// State database for storing state changes
+	db common.Database
+	// The state object
+	State *StateDB
+
+	// Address belonging to this account
+	address []byte
+	// The balance of the account
+	balance *big.Int
+	// The nonce of the account
+	nonce uint64
+	// The code hash if code is present (i.e. a contract)
+	codeHash []byte
+	// The code for this account
+	code Code
+	// Temporarily initialisation code
+	initCode Code
+	// Cached storage (flushed when updated)
+	storage Storage
+	// Temporary prepaid gas, reward after transition
+	prepaid *big.Int
+
+	// 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
+	dirty  bool
+}
+
+func (self *StateObject) Reset() {
+	self.storage = make(Storage)
+	self.State.Reset()
+}
+
+func NewStateObject(addr []byte, db common.Database) *StateObject {
+	// This to ensure that it has 20 bytes (and not 0 bytes), thus left or right pad doesn't matter.
+	address := common.Address(addr)
+
+	object := &StateObject{db: db, address: address, balance: new(big.Int), gasPool: new(big.Int), dirty: true}
+	object.State = New(nil, db) //New(trie.New(common.Config.Db, ""))
+	object.storage = make(Storage)
+	object.gasPool = new(big.Int)
+	object.prepaid = new(big.Int)
+
+	return object
+}
+
+func NewStateObjectFromBytes(address, data []byte, db common.Database) *StateObject {
+	// TODO clean me up
+	var extobject struct {
+		Nonce    uint64
+		Balance  *big.Int
+		Root     []byte
+		CodeHash []byte
+	}
+	err := rlp.Decode(bytes.NewReader(data), &extobject)
+	if err != nil {
+		fmt.Println(err)
+		return nil
+	}
+
+	object := &StateObject{address: address, db: db}
+	//object.RlpDecode(data)
+	object.nonce = extobject.Nonce
+	object.balance = extobject.Balance
+	object.codeHash = extobject.CodeHash
+	object.State = New(extobject.Root, db)
+	object.storage = make(map[string]*common.Value)
+	object.gasPool = new(big.Int)
+	object.prepaid = new(big.Int)
+	object.code, _ = db.Get(extobject.CodeHash)
+
+	return object
+}
+
+func (self *StateObject) MarkForDeletion() {
+	self.remove = true
+	self.dirty = true
+	statelogger.Debugf("%x: #%d %v X\n", self.Address(), self.nonce, self.balance)
+}
+
+func (c *StateObject) getAddr(addr []byte) *common.Value {
+	return common.NewValueFromBytes([]byte(c.State.trie.Get(addr)))
+}
+
+func (c *StateObject) setAddr(addr []byte, value interface{}) {
+	c.State.trie.Update(addr, common.Encode(value))
+}
+
+func (self *StateObject) GetStorage(key *big.Int) *common.Value {
+	return self.GetState(key.Bytes())
+}
+func (self *StateObject) SetStorage(key *big.Int, value *common.Value) {
+	self.SetState(key.Bytes(), value)
+}
+
+func (self *StateObject) Storage() Storage {
+	return self.storage
+}
+
+func (self *StateObject) GetState(k []byte) *common.Value {
+	key := common.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 *common.Value) {
+	key := common.LeftPadBytes(k, 32)
+	self.storage[string(key)] = value.Copy()
+	self.dirty = true
+}
+
+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)
+	}
+	self.storage = make(Storage)
+}
+
+func (c *StateObject) GetInstr(pc *big.Int) *common.Value {
+	if int64(len(c.code)-1) < pc.Int64() {
+		return common.NewValue(0)
+	}
+
+	return common.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) 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) SetBalance(amount *big.Int) {
+	c.balance = amount
+	c.dirty = true
+}
+
+func (c *StateObject) St() Storage {
+	return c.storage
+}
+
+//
+// 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.SubBalance(total)
+
+	c.dirty = true
+
+	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)
+	}
+
+	self.gasPool.Sub(self.gasPool, gas)
+
+	rGas := new(big.Int).Set(gas)
+	rGas.Mul(rGas, price)
+
+	self.dirty = true
+
+	return nil
+}
+
+func (self *StateObject) RefundGas(gas, price *big.Int) {
+	self.gasPool.Add(self.gasPool, gas)
+}
+
+func (self *StateObject) Copy() *StateObject {
+	stateObject := NewStateObject(self.Address(), self.db)
+	stateObject.balance.Set(self.balance)
+	stateObject.codeHash = common.CopyBytes(self.codeHash)
+	stateObject.nonce = self.nonce
+	if self.State != nil {
+		stateObject.State = self.State.Copy()
+	}
+	stateObject.code = common.CopyBytes(self.code)
+	stateObject.initCode = common.CopyBytes(self.initCode)
+	stateObject.storage = self.storage.Copy()
+	stateObject.gasPool.Set(self.gasPool)
+	stateObject.remove = self.remove
+	stateObject.dirty = self.dirty
+
+	return stateObject
+}
+
+func (self *StateObject) Set(stateObject *StateObject) {
+	*self = *stateObject
+}
+
+//
+// Attribute accessors
+//
+
+func (self *StateObject) Balance() *big.Int {
+	return self.balance
+}
+
+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.SecureTrie {
+	return self.State.trie
+}
+
+func (self *StateObject) Root() []byte {
+	return self.Trie().Root()
+}
+
+func (self *StateObject) Code() []byte {
+	return self.code
+}
+
+func (self *StateObject) SetCode(code []byte) {
+	self.code = code
+	self.dirty = true
+}
+
+func (self *StateObject) SetInitCode(code []byte) {
+	self.initCode = code
+	self.dirty = true
+}
+
+func (self *StateObject) SetNonce(nonce uint64) {
+	self.nonce = nonce
+	self.dirty = true
+}
+
+func (self *StateObject) Nonce() uint64 {
+	return self.nonce
+}
+
+//
+// Encoding
+//
+
+// State object encoding methods
+func (c *StateObject) RlpEncode() []byte {
+	return common.Encode([]interface{}{c.nonce, c.balance, c.Root(), c.CodeHash()})
+}
+
+func (c *StateObject) CodeHash() common.Bytes {
+	return crypto.Sha3(c.code)
+}
+
+func (c *StateObject) RlpDecode(data []byte) {
+	decoder := common.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(common.Config.Db, decoder.Get(2).Interface()))
+	c.storage = make(map[string]*common.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
+}