filer: add leveldb3

support dedicated leveldb instance for each bucket

weed/filer/leveldb3/leveldb3_store_kv.go

@@ -0,0 +1,46 @@
+package leveldb
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/syndtr/goleveldb/leveldb"
+)
+
+func (store *LevelDB3Store) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
+
+	err = store.dbs[DEFAULT].Put(key, value, nil)
+
+	if err != nil {
+		return fmt.Errorf("kv put: %v", err)
+	}
+
+	return nil
+}
+
+func (store *LevelDB3Store) KvGet(ctx context.Context, key []byte) (value []byte, err error) {
+
+	value, err = store.dbs[DEFAULT].Get(key, nil)
+
+	if err == leveldb.ErrNotFound {
+		return nil, filer.ErrKvNotFound
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("kv get: %v", err)
+	}
+
+	return
+}
+
+func (store *LevelDB3Store) KvDelete(ctx context.Context, key []byte) (err error) {
+
+	err = store.dbs[DEFAULT].Delete(key, nil)
+
+	if err != nil {
+		return fmt.Errorf("kv delete: %v", err)
+	}
+
+	return nil
+}