trie: dirty tracking

trie/shortnode.go

@@ -6,20 +6,22 @@ type ShortNode struct {
 	trie  *Trie
 	key   []byte
 	value Node
+	dirty bool
 }
 
 func NewShortNode(t *Trie, key []byte, value Node) *ShortNode {
-	return &ShortNode{t, []byte(CompactEncode(key)), value}
+	return &ShortNode{t, []byte(CompactEncode(key)), value, false}
 }
 func (self *ShortNode) Value() Node {
 	self.value = self.trie.trans(self.value)
 
 	return self.value
 }
-func (self *ShortNode) Dirty() bool { return true }
+func (self *ShortNode) Dirty() bool { return self.dirty }
 func (self *ShortNode) Copy(t *Trie) Node {
-	node := &ShortNode{t, nil, self.value.Copy(t)}
+	node := &ShortNode{t, nil, self.value.Copy(t), self.dirty}
 	node.key = common.CopyBytes(self.key)
+	node.dirty = true
 	return node
 }
 
@@ -33,3 +35,7 @@ func (self *ShortNode) Hash() interface{} {
 func (self *ShortNode) Key() []byte {
 	return CompactDecode(string(self.key))
 }
+
+func (self *ShortNode) setDirty(dirty bool) {
+	self.dirty = dirty
+}