Added sample server, genesis block, and database interface

database.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+  "path"
+  "os/user"
+  "github.com/syndtr/goleveldb/leveldb"
+  "fmt"
+)
+
+type Database struct {
+  db        *leveldb.DB
+  trie      *Trie
+}
+
+func NewDatabase() (*Database, error) {
+  // This will eventually have to be something like a resource folder.
+  // it works on my system for now. Probably won't work on Windows
+  usr, _ := user.Current()
+  dbPath := path.Join(usr.HomeDir, ".ethereum", "database")
+
+  // Open the db
+  db, err := leveldb.OpenFile(dbPath, nil)
+  if err != nil {
+    return nil, err
+  }
+
+  database := &Database{db: db}
+
+  // Bootstrap database. Sets a few defaults; such as the last block
+  database.Bootstrap()
+
+  return database, nil
+}
+
+func (db *Database) Bootstrap() error {
+  db.trie = NewTrie(db)
+
+  return nil
+}
+
+func (db *Database) Put(key []byte, value []byte) {
+  err := db.db.Put(key, value, nil)
+  if err != nil {
+    fmt.Println("Error put", err)
+  }
+}
+
+func (db *Database) Close() {
+  // Close the leveldb database
+  db.db.Close()
+}
+
+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, key, 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
+}