ethstate => state

1 files changed, 321 insertions, 0 deletions

diff --git a/state/state.go b/state/state.go
new file mode 100644
index 000000000..298cf9680
--- /dev/null
+++ b/state/state.go
@@ -0,0 +1,321 @@
+package state
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/ethtrie"
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/logger"
+)
+
+var statelogger = logger.NewLogger("STATE")
+
+// States within the ethereum protocol are used to store anything
+// within the merkle trie. States take care of caching and storing
+// nested states. It's the general query interface to retrieve:
+// * Contracts
+// * Accounts
+type State struct {
+	// The trie for this structure
+	Trie *ethtrie.Trie
+
+	stateObjects map[string]*StateObject
+
+	manifest *Manifest
+
+	refund map[string]*big.Int
+
+	logs Logs
+}
+
+// Create a new state from a given trie
+func New(trie *ethtrie.Trie) *State {
+	return &State{Trie: trie, stateObjects: make(map[string]*StateObject), manifest: NewManifest(), refund: make(map[string]*big.Int)}
+}
+
+func (self *State) EmptyLogs() {
+	self.logs = nil
+}
+
+func (self *State) AddLog(log Log) {
+	self.logs = append(self.logs, log)
+}
+
+func (self *State) Logs() Logs {
+	return self.logs
+}
+
+// Retrieve the balance from the given address or 0 if object not found
+func (self *State) GetBalance(addr []byte) *big.Int {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		return stateObject.balance
+	}
+
+	return ethutil.Big0
+}
+
+func (self *State) Refund(addr []byte, gas, price *big.Int) {
+	amount := new(big.Int).Mul(gas, price)
+
+	if self.refund[string(addr)] == nil {
+		self.refund[string(addr)] = new(big.Int)
+	}
+
+	self.refund[string(addr)] = new(big.Int).Add(self.refund[string(addr)], amount)
+}
+
+func (self *State) AddBalance(addr []byte, amount *big.Int) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.AddBalance(amount)
+	}
+}
+
+func (self *State) GetNonce(addr []byte) uint64 {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		return stateObject.Nonce
+	}
+
+	return 0
+}
+
+func (self *State) SetNonce(addr []byte, nonce uint64) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.Nonce = nonce
+	}
+}
+
+func (self *State) GetCode(addr []byte) []byte {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		return stateObject.Code
+	}
+
+	return nil
+}
+
+func (self *State) GetState(a, b []byte) []byte {
+	stateObject := self.GetStateObject(a)
+	if stateObject != nil {
+		return stateObject.GetState(b).Bytes()
+	}
+
+	return nil
+}
+
+func (self *State) SetState(addr, key []byte, value interface{}) {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.SetState(key, ethutil.NewValue(value))
+	}
+}
+
+func (self *State) Delete(addr []byte) bool {
+	stateObject := self.GetStateObject(addr)
+	if stateObject != nil {
+		stateObject.MarkForDeletion()
+
+		return true
+	}
+
+	return false
+}
+
+//
+// Setting, updating & deleting state object methods
+//
+
+// Update the given state object and apply it to state trie
+func (self *State) UpdateStateObject(stateObject *StateObject) {
+	addr := stateObject.Address()
+
+	if len(stateObject.CodeHash()) > 0 {
+		ethutil.Config.Db.Put(stateObject.CodeHash(), stateObject.Code)
+	}
+
+	self.Trie.Update(string(addr), string(stateObject.RlpEncode()))
+}
+
+// Delete the given state object and delete it from the state trie
+func (self *State) DeleteStateObject(stateObject *StateObject) {
+	self.Trie.Delete(string(stateObject.Address()))
+
+	delete(self.stateObjects, string(stateObject.Address()))
+}
+
+// Retrieve a state object given my the address. Nil if not found
+func (self *State) GetStateObject(addr []byte) *StateObject {
+	addr = ethutil.Address(addr)
+
+	stateObject := self.stateObjects[string(addr)]
+	if stateObject != nil {
+		return stateObject
+	}
+
+	data := self.Trie.Get(string(addr))
+	if len(data) == 0 {
+		return nil
+	}
+
+	stateObject = NewStateObjectFromBytes(addr, []byte(data))
+	self.SetStateObject(stateObject)
+
+	return stateObject
+}
+
+func (self *State) SetStateObject(object *StateObject) {
+	self.stateObjects[string(object.address)] = object
+}
+
+// Retrieve a state object or create a new state object if nil
+func (self *State) 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 *State) NewStateObject(addr []byte) *StateObject {
+	addr = ethutil.Address(addr)
+
+	statelogger.Debugf("(+) %x\n", addr)
+
+	stateObject := NewStateObject(addr)
+	self.stateObjects[string(addr)] = stateObject
+
+	return stateObject
+}
+
+// Deprecated
+func (self *State) GetAccount(addr []byte) *StateObject {
+	return self.GetOrNewStateObject(addr)
+}
+
+//
+// Setting, copying of the state methods
+//
+
+func (s *State) Cmp(other *State) bool {
+	return s.Trie.Cmp(other.Trie)
+}
+
+func (self *State) Copy() *State {
+	if self.Trie != nil {
+		state := New(self.Trie.Copy())
+		for k, stateObject := range self.stateObjects {
+			state.stateObjects[k] = stateObject.Copy()
+		}
+
+		for addr, refund := range self.refund {
+			state.refund[addr] = refund
+		}
+
+		logs := make(Logs, len(self.logs))
+		copy(logs, self.logs)
+		state.logs = logs
+
+		return state
+	}
+
+	return nil
+}
+
+func (self *State) Set(state *State) {
+	if state == nil {
+		panic("Tried setting 'state' to nil through 'Set'")
+	}
+
+	self.Trie = state.Trie
+	self.stateObjects = state.stateObjects
+	self.refund = state.refund
+	self.logs = state.logs
+}
+
+func (s *State) Root() interface{} {
+	return s.Trie.Root
+}
+
+// Resets the trie and all siblings
+func (s *State) Reset() {
+	s.Trie.Undo()
+
+	// Reset all nested states
+	for _, stateObject := range s.stateObjects {
+		if stateObject.State == nil {
+			continue
+		}
+
+		//stateObject.state.Reset()
+		stateObject.Reset()
+	}
+
+	s.Empty()
+}
+
+// Syncs the trie and all siblings
+func (s *State) Sync() {
+	// Sync all nested states
+	for _, stateObject := range s.stateObjects {
+		if stateObject.State == nil {
+			continue
+		}
+
+		stateObject.State.Sync()
+	}
+
+	s.Trie.Sync()
+
+	s.Empty()
+}
+
+func (self *State) Empty() {
+	self.stateObjects = make(map[string]*StateObject)
+	self.refund = make(map[string]*big.Int)
+}
+
+func (self *State) Update() {
+	var deleted bool
+
+	// Refund any gas that's left
+	for addr, amount := range self.refund {
+		self.GetStateObject([]byte(addr)).AddBalance(amount)
+	}
+
+	for _, stateObject := range self.stateObjects {
+		if stateObject.remove {
+			self.DeleteStateObject(stateObject)
+			deleted = true
+		} else {
+			stateObject.Sync()
+
+			self.UpdateStateObject(stateObject)
+		}
+	}
+
+	// FIXME trie delete is broken
+	if deleted {
+		valid, t2 := ethtrie.ParanoiaCheck(self.Trie)
+		if !valid {
+			statelogger.Infof("Warn: PARANOIA: Different state root during copy %x vs %x\n", self.Trie.Root, t2.Root)
+
+			self.Trie = t2
+		}
+	}
+}
+
+func (self *State) Manifest() *Manifest {
+	return self.manifest
+}
+
+// Debug stuff
+func (self *State) CreateOutputForDiff() {
+	for _, stateObject := range self.stateObjects {
+		stateObject.CreateOutputForDiff()
+	}
+}