feat: leveldb for keychain

keychain/leveldb_store.go

@@ -0,0 +1,53 @@
+package keychain
+
+import (
+	"encoding/json"
+	"github.com/DE-labtory/zulu/db/leveldb"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+func NewLevelDBStore(handle leveldb.DBHandle) *LevelDBStore {
+	return &LevelDBStore{handle: handle}
+}
+
+type LevelDBStore struct {
+	handle leveldb.DBHandle
+}
+
+func (l *LevelDBStore) Store(k Key) error {
+	rawData, err := json.Marshal(k)
+	if err != nil {
+		return err
+	}
+	err = l.handle.Put([]byte(k.ID), rawData, true)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (l *LevelDBStore) Get(id string) Key {
+	var k Key
+	rawData, err := l.handle.Get([]byte(id))
+
+	// check leveldb error
+	if err != nil {
+		log.Error("error while find key :" + id + ", in level db key store")
+		return k
+	}
+
+	// check empty data
+	if rawData == nil {
+		return k
+	}
+
+	// check unmarshal data
+	err = json.Unmarshal(rawData, &k)
+	if err != nil {
+		log.Error("error while unmarshal key :" + id + ", in level db key store")
+		return k
+	}
+
+	// with no err
+	return k
+}