Split up db and trie and added interface

trie.go

@@ -0,0 +1,50 @@
+package main
+
+// Database interface
+type Database interface {
+  Put(key []byte, value []byte)
+  Get(key []byte) ([]byte, error)
+}
+
+type Trie struct {
+  root       string
+  db         Database
+}
+
+func NewTrie(db Database) *Trie {
+  return &Trie{db: db, root: ""}
+}
+
+func (t *Trie) Update(key string, value string) {
+  k := CompactHexDecode(key)
+
+  t.root = t.UpdateState(t.root, k, value)
+}
+
+func (t *Trie) Get(key []byte) ([]byte, error) {
+  return nil, nil
+}
+
+// Inserts a new sate or delete a state based on the value
+func (t *Trie) UpdateState(node string, key []int, value string) string {
+  if value != "" {
+    return t.InsertState(node, ""/*key*/, value)
+  } else {
+    // delete it
+  }
+
+  return ""
+}
+
+func (t *Trie) InsertState(node, key, value string) string {
+  return ""
+}
+
+func (t *Trie) Put(node []byte) []byte {
+  enc := Encode(node)
+  sha := Sha256Bin(enc)
+
+  t.db.Put([]byte(sha), enc)
+
+  return sha
+}