initial commit

crypto/vm/db/DynamicBagOfCellsDb.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 "vm/cells.h"
+
+#include "td/utils/Slice.h"
+#include "td/utils/Status.h"
+
+namespace vm {
+class CellLoader;
+class CellStorer;
+}  // namespace vm
+
+namespace vm {
+class ExtCellCreator {
+ public:
+  virtual ~ExtCellCreator() = default;
+  virtual td::Result<Ref<Cell>> ext_cell(Cell::LevelMask level_mask, td::Slice hash, td::Slice depth) = 0;
+};
+
+class DynamicBagOfCellsDb {
+ public:
+  virtual ~DynamicBagOfCellsDb() = default;
+  virtual td::Result<Ref<DataCell>> load_cell(td::Slice hash) = 0;
+  struct Stats {
+    td::int64 cells_total_count{0};
+    td::int64 cells_total_size{0};
+    void apply_diff(Stats diff) {
+      cells_total_count += diff.cells_total_count;
+      cells_total_size += diff.cells_total_size;
+    }
+  };
+  virtual void inc(const Ref<Cell> &old_root) = 0;
+  virtual void dec(const Ref<Cell> &old_root) = 0;
+
+  virtual td::Status prepare_commit() = 0;
+  virtual Stats get_stats_diff() = 0;
+  virtual td::Status commit(CellStorer &) = 0;
+
+  // restart with new loader will also reset stats_diff
+  virtual td::Status set_loader(std::unique_ptr<CellLoader> loader) = 0;
+
+  static std::unique_ptr<DynamicBagOfCellsDb> create();
+};
+
+}  // namespace vm