[CP] change sync rpc to async for transfer and migration

src/storage/ob_storage_async_rpc.h

@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#ifndef OCEANBASE_STORAGE_STORAGE_ASYNC_RPC_H_
+#define OCEANBASE_STORAGE_STORAGE_ASYNC_RPC_H_
+
+#include "share/ob_rpc_struct.h"
+#include "share/ob_srv_rpc_proxy.h"
+#include "share/rpc/ob_async_rpc_proxy.h"
+#include "rpc/obrpc/ob_rpc_packet.h"
+#include "rpc/obrpc/ob_rpc_result_code.h"
+#include "rpc/obrpc/ob_rpc_proxy.h"
+
+namespace oceanbase
+{
+namespace storage
+{
+
+#define RPC_HA(code, arg, result, name) \
+  typedef obrpc::ObAsyncRpcProxy<code, arg, result, \
+    int (obrpc::ObStorageRpcProxy::*)(const arg &, obrpc::ObStorageRpcProxy::AsyncCB<code> *, const obrpc::ObRpcOpts &), obrpc::ObStorageRpcProxy> name
+
+RPC_HA(obrpc::OB_HA_CHECK_TRANSFER_TABLET_BACKFILL, obrpc::ObCheckTransferTabletBackfillArg, obrpc::ObCheckTransferTabletBackfillRes, ObCheckTransferTabletBackfillProxy);
+RPC_HA(obrpc::OB_HA_CHANGE_MEMBER_SERVICE, obrpc::ObStorageChangeMemberArg, obrpc::ObStorageChangeMemberRes, ObHAChangeMemberProxy);
+RPC_HA(obrpc::OB_CHECK_START_TRANSFER_TABLETS, obrpc::ObTransferTabletInfoArg, obrpc::Int64, ObCheckStartTransferTabletsProxy);
+
+}//end namespace storage
+}//end namespace oceanbase
+
+#endif //OCEANBASE_STORAGE_STORAGE_ASYNC_RPC_H_