1 files changed, 318 insertions, 0 deletions
diff --git a/state/statedb.go b/state/statedb.go
new file mode 100644
index 000000000..a0dc7732f
--- /dev/null
+++ b/state/statedb.go
@@ -0,0 +1,318 @@
+package state
+
+import (
+	"bytes"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/trie"
+)
+
+var statelogger = logger.NewLogger("STATE")
+
+// StateDBs within the ethereum protocol are used to store anything
+// within the merkle trie. StateDBs take care of caching and storing
+// nested states. It's the general query interface to retrieve:
+// * Contracts
+// * Accounts
+type StateDB struct {
+	db   ethutil.Database
+	trie *trie.SecureTrie
+
+	stateObjects map[string]*StateObject
+
+	refund map[string]*big.Int
+
+	logs Logs
+}
+
+// Create a new state from a given trie
+func New(root []byte, db ethutil.Database) *StateDB {
+	trie := trie.NewSecure(ethutil.CopyBytes(root), db)
+	return &StateDB{db: db, trie: trie, stateObjects: make(map[string]*StateObject), refund: make(map[string]*big.Int)}
+}
+
+func (self *StateDB) EmptyLogs() {
+	self.logs = nil
+}
+
+func (self *StateDB) AddLog(log Log) {
+	self.logs = append(self.logs, log)
+}
+
+func (self *StateDB) Logs() Logs {
+	return self.logs
+}
+
+func (self *StateDB) Refund(addr []byte, gas *big.Int) {
+	if self.refund[string(addr)] == nil {
+		self.refund[string(addr)] = new(big.Int)
+	}
+	self.refund[string(addr)].Add(self.refund[string(addr)], gas)
+}
+
+// Retrieve the balance from the given address or 0 if object not found
+func (self *StateDB) GetBalance(addr []byte) *big.Int {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		return stateObject.balance
+	}
+
+	return ethutil.Big0
+}
+
+func (self *StateDB) AddBalance(addr []byte, amount *big.Int) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.AddBalance(amount)
+	}
+}
+
+func (self *StateDB) GetNonce(addr []byte) uint64 {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		return stateObject.nonce
+	}
+
+	return 0
+}
+
+func (self *StateDB) GetCode(addr []byte) []byte {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		return stateObject.code
+	}
+
+	return nil
+}
+
+func (self *StateDB) GetState(a, b []byte) []byte {
+	stateObject := self.GetStateObject(a)
+	if stateObject != nil {
+		return stateObject.GetState(b).Bytes()
+	}
+
+	return nil
+}
+
+func (self *StateDB) SetNonce(addr []byte, nonce uint64) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.SetNonce(nonce)
+	}
+}
+
+func (self *StateDB) SetCode(addr, code []byte) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.SetCode(code)
+	}
+}
+
+func (self *StateDB) SetState(addr, key []byte, value interface{}) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.SetState(key, ethutil.NewValue(value))
+	}
+}
+
+func (self *StateDB) Delete(addr []byte) bool {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.MarkForDeletion()
+		stateObject.balance = new(big.Int)
+
+		return true
+	}
+
+	return false
+}
+
+func (self *StateDB) IsDeleted(addr []byte) bool {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		return stateObject.remove
+	}
+	return false
+}
+
+//
+// Setting, updating & deleting state object methods
+//
+
+// Update the given state object and apply it to state trie
+func (self *StateDB) UpdateStateObject(stateObject *StateObject) {
+	addr := stateObject.Address()
+
+	if len(stateObject.CodeHash()) > 0 {
+		self.db.Put(stateObject.CodeHash(), stateObject.code)
+	}
+
+	self.trie.Update(addr, stateObject.RlpEncode())
+}
+
+// Delete the given state object and delete it from the state trie
+func (self *StateDB) DeleteStateObject(stateObject *StateObject) {
+	self.trie.Delete(stateObject.Address())
+
+	delete(self.stateObjects, string(stateObject.Address()))
+}
+
+// Retrieve a state object given my the address. Nil if not found
+func (self *StateDB) GetStateObject(addr []byte) *StateObject {
+	addr = ethutil.Address(addr)
+
+	stateObject := self.stateObjects[string(addr)]
+	if stateObject != nil {
+		return stateObject
+	}
+
+	data := self.trie.Get(addr)
+	if len(data) == 0 {
+		return nil
+	}
+
+	stateObject = NewStateObjectFromBytes(addr, []byte(data), self.db)
+	self.SetStateObject(stateObject)
+
+	return stateObject
+}
+
+func (self *StateDB) SetStateObject(object *StateObject) {
+	self.stateObjects[string(object.address)] = object
+}
+
+// Retrieve a state object or create a new state object if nil
+func (self *StateDB) GetOrNewStateObject(addr []byte) *StateObject {
+	stateObject := self.GetStateObject(addr)
+	if stateObject == nil {
+		stateObject = self.NewStateObject(addr)
+	}
+
+	return stateObject
+}
+
+// Create a state object whether it exist in the trie or not
+func (self *StateDB) NewStateObject(addr []byte) *StateObject {
+	addr = ethutil.Address(addr)
+
+	statelogger.Debugf("(+) %x\n", addr)
+
+	stateObject := NewStateObject(addr, self.db)
+	self.stateObjects[string(addr)] = stateObject
+
+	return stateObject
+}
+
+// Deprecated
+func (self *StateDB) GetAccount(addr []byte) *StateObject {
+	return self.GetOrNewStateObject(addr)
+}
+
+//
+// Setting, copying of the state methods
+//
+
+func (s *StateDB) Cmp(other *StateDB) bool {
+	return bytes.Equal(s.trie.Root(), other.trie.Root())
+}
+
+func (self *StateDB) Copy() *StateDB {
+	state := New(nil, self.db)
+	state.trie = self.trie.Copy()
+	for k, stateObject := range self.stateObjects {
+		state.stateObjects[k] = stateObject.Copy()
+	}
+
+	for addr, refund := range self.refund {
+		state.refund[addr] = new(big.Int).Set(refund)
+	}
+
+	logs := make(Logs, len(self.logs))
+	copy(logs, self.logs)
+	state.logs = logs
+
+	return state
+}
+
+func (self *StateDB) Set(state *StateDB) {
+	self.trie = state.trie
+	self.stateObjects = state.stateObjects
+
+	self.refund = state.refund
+	self.logs = state.logs
+}
+
+func (s *StateDB) Root() []byte {
+	return s.trie.Root()
+}
+
+func (s *StateDB) Trie() *trie.SecureTrie {
+	return s.trie
+}
+
+// Resets the trie and all siblings
+func (s *StateDB) Reset() {
+	s.trie.Reset()
+
+	// Reset all nested states
+	for _, stateObject := range s.stateObjects {
+		if stateObject.State == nil {
+			continue
+		}
+
+		stateObject.Reset()
+	}
+
+	s.Empty()
+}
+
+// Syncs the trie and all siblings
+func (s *StateDB) Sync() {
+	// Sync all nested states
+	for _, stateObject := range s.stateObjects {
+		if stateObject.State == nil {
+			continue
+		}
+
+		stateObject.State.Sync()
+	}
+
+	s.trie.Commit()
+
+	s.Empty()
+}
+
+func (self *StateDB) Empty() {
+	self.stateObjects = make(map[string]*StateObject)
+	self.refund = make(map[string]*big.Int)
+}
+
+func (self *StateDB) Refunds() map[string]*big.Int {
+	return self.refund
+}
+
+func (self *StateDB) Update(gasUsed *big.Int) {
+	self.refund = make(map[string]*big.Int)
+
+	for _, stateObject := range self.stateObjects {
+		if stateObject.dirty {
+			if stateObject.remove {
+				self.DeleteStateObject(stateObject)
+			} else {
+				stateObject.Sync()
+
+				self.UpdateStateObject(stateObject)
+			}
+			stateObject.dirty = false
+		}
+	}
+}
+
+// Debug stuff
+func (self *StateDB) CreateOutputForDiff() {
+	for _, stateObject := range self.stateObjects {
+		stateObject.CreateOutputForDiff()
+	}
+}