Created an interface for the Db class

src/libs/database/impl/Db.hpp

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2019 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <mutex>
+#include <vector>
+
+#include <Wt/Dbo/SqlConnectionPool.h>
+
+#include "core/RecursiveSharedMutex.hpp"
+
+#include "database/IDb.hpp"
+
+namespace lms::db
+{
+    class Db : public IDb
+    {
+    public:
+        Db(const std::filesystem::path& dbPath, std::size_t connectionCount);
+
+        Session& getTLSSession() override;
+
+        void executeSql(const std::string& sql) override;
+
+    private:
+        Db(const Db&) = delete;
+        Db& operator=(const Db&) = delete;
+
+        friend class Session;
+
+        core::RecursiveSharedMutex& getMutex() { return _sharedMutex; }
+        Wt::Dbo::SqlConnectionPool& getConnectionPool() { return *_connectionPool; }
+
+        void performQuickCheck();
+        void performIntegrityCheck();
+        void performForeignKeyConstraintsCheck();
+
+        class ScopedConnection
+        {
+        public:
+            ScopedConnection(Wt::Dbo::SqlConnectionPool& pool);
+            ~ScopedConnection();
+
+            Wt::Dbo::SqlConnection* operator->() const;
+            Wt::Dbo::SqlConnection& operator*() const { return *_connection; }
+
+        private:
+            ScopedConnection(const ScopedConnection&) = delete;
+            ScopedConnection& operator=(const ScopedConnection&) = delete;
+
+            Wt::Dbo::SqlConnectionPool& _connectionPool;
+            std::unique_ptr<Wt::Dbo::SqlConnection> _connection;
+        };
+
+        core::RecursiveSharedMutex _sharedMutex;
+        std::unique_ptr<Wt::Dbo::SqlConnectionPool> _connectionPool;
+
+        std::mutex _tlsSessionsMutex;
+        std::vector<std::unique_ptr<Session>> _tlsSessions;
+    };
+
+} // namespace lms::db