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crypto/vm/db/CellStorage.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+#include "td/db/KeyValue.h"
+#include "vm/db/DynamicBagOfCellsDb.h"
+#include "vm/cells.h"
+
+#include "td/utils/Slice.h"
+#include "td/utils/Status.h"
+
+namespace vm {
+using KeyValue = td::KeyValue;
+using KeyValueReader = td::KeyValueReader;
+
+class CellLoader {
+ public:
+  struct LoadResult {
+   public:
+    enum { Ok, NotFound } status{NotFound};
+
+    Ref<DataCell> &cell() {
+      DCHECK(status == Ok);
+      return cell_;
+    }
+
+    td::int32 refcnt() const {
+      return refcnt_;
+    }
+
+    Ref<DataCell> cell_;
+    td::int32 refcnt_{0};
+  };
+  CellLoader(std::shared_ptr<KeyValueReader> reader);
+  td::Result<LoadResult> load(td::Slice hash, bool need_data, ExtCellCreator &ext_cell_creator);
+
+ private:
+  std::shared_ptr<KeyValueReader> reader_;
+};
+
+class CellStorer {
+ public:
+  CellStorer(KeyValue &kv);
+  td::Status erase(td::Slice hash);
+  td::Status set(td::int32 refcnt, const DataCell &cell);
+
+ private:
+  KeyValue &kv_;
+};
+}  // namespace vm