Add OriginsDB base class and a make() function

This fixes the build. The make function for the moment
just takes a string since that's all that's ever needed.
This is supposed to change since the postgresql database
will need a port, an url, password etc. Maybe
connection strings are still a thing, but if not then
I'll probably need to find a way to accept arbitrary
parameters in OriginsDB::make().

src/main.cpp

@@ -74,10 +74,11 @@ int main(int argc, char* argv[]) {
 
 		print_ping(oro_api);
 
-		oro::OriginsDB db(app_conf.db_path());
+		std::unique_ptr<oro::OriginsDB> db(oro::OriginsDB::make("sqlite", app_conf.db_path()));
+
 		duck::test(
 			&oro_api,
-			&db,
+			db.get(),
 			app_conf.fetch_extra_delay(),
 			app_conf.worker_threads()
 		);
@@ -87,6 +88,11 @@ int main(int argc, char* argv[]) {
 			"\" failed: " << err.what() << '\n';
 		return 1;
 	}
+	catch (const std::exception& err) {
+		std::cerr << "An error occurred during the program execution: " <<
+			err.what() << '\n';
+		return 1;
+	}
 
 /*
 	{

src/meson.build

@@ -89,6 +89,7 @@ executable(meson.project_name(),
   'eventia/signal.cpp',
   'eventia/event.cpp',
   'timer_oro_api.cpp',
+  'oro/originsdb.cpp',
   project_config_file,
   install: true,
   dependencies: lib_deps,

src/oro/originsdb.cpp

@@ -0,0 +1,42 @@
+/* Copyright 2020, Michele Santullo
+ * This file is part of orotool.
+ *
+ * Orotool 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.
+ *
+ * Orotool 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 Orotool.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "oro/originsdb.hpp"
+#include "orotool_config.hpp"
+#if defined(OROTOOL_WITH_SQLITE)
+#	include "oro/private/originsdb_sqlite.hpp"
+#endif
+#include <exception>
+#include <sstream>
+
+namespace oro {
+	std::unique_ptr<OriginsDB> OriginsDB::make (std::string_view name, std::string_view param) {
+		if (false) {
+			return {};
+		}
+#if defined(OROTOOL_WITH_SQLITE)
+		else if (name == "sqlite") {
+			return std::make_unique<OriginsDBSQLite>(param);
+		}
+#endif
+		else {
+			std::ostringstream oss;
+			oss << "Unable to create a databale backend of type \"" << name << '"';
+			throw std::invalid_argument(oss.str());
+		}
+	}
+} //namespace oro

src/oro/originsdb.hpp

@@ -0,0 +1,46 @@
+/* Copyright 2020, Michele Santullo
+ * This file is part of orotool.
+ *
+ * Orotool 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.
+ *
+ * Orotool 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 Orotool.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "datatypes.hpp"
+#include "oro/dboperation.hpp"
+#include <string_view>
+#include <memory>
+
+namespace oro {
+
+struct Items;
+struct Icons;
+struct Shops;
+struct Creators;
+
+class OriginsDB {
+public:
+	OriginsDB() = default;
+	virtual ~OriginsDB() noexcept = default;
+
+	virtual void update (const Items& items, const oro::Timestamp& next_update) = 0;
+	virtual void update (const Icons& icons, const oro::Timestamp& next_update) = 0;
+	virtual void update (const Shops& shops, const oro::Timestamp& next_update) = 0;
+	virtual void update (const Creators& creat, const oro::Timestamp& next_update) = 0;
+
+	virtual Timestamp next_access_time (DBOperation op) const = 0;
+
+	static std::unique_ptr<OriginsDB> make (std::string_view name, std::string_view param);
+};
+} //namespace oro

src/oro/private/originsdb_sqlite.cpp

@@ -18,7 +18,7 @@
 #include "orotool_config.hpp"
 #if defined(OROTOOL_WITH_SQLITE)
 
-#include "originsdb.hpp"
+#include "originsdb_sqlite.hpp"
 #include "SQLiteCpp/Database.h"
 #include "SQLiteCpp/Statement.h"
 #include "SQLiteCpp/Transaction.h"
@@ -324,7 +324,7 @@ namespace {
 	}
 } //unnamed namespace
 
-OriginsDB::OriginsDB (std::string_view path) :
+OriginsDBSQLite::OriginsDBSQLite (std::string_view path) :
 	m_path(path.data(), path.size()),
 	m_db(std::make_unique<SQLite::Database>(m_path, SQLite::OPEN_READWRITE | SQLite::OPEN_CREATE))
 {
@@ -334,9 +334,9 @@ OriginsDB::OriginsDB (std::string_view path) :
 	}
 }
 
-OriginsDB::~OriginsDB() noexcept = default;
+OriginsDBSQLite::~OriginsDBSQLite() noexcept = default;
 
-void OriginsDB::update (const Items& items, const oro::Timestamp& next_update) {
+void OriginsDBSQLite::update (const Items& items, const oro::Timestamp& next_update) {
 	auto& db = *m_db;
 	std::unique_lock<std::mutex> lock(m_db_mutex);
 	update_last_access(db, DBOperation::Items, next_update);
@@ -396,7 +396,7 @@ void OriginsDB::update (const Items& items, const oro::Timestamp& next_update) {
 	transaction.commit();
 }
 
-void OriginsDB::update (const Icons& icons, const oro::Timestamp& next_update) {
+void OriginsDBSQLite::update (const Icons& icons, const oro::Timestamp& next_update) {
 	//example:
 	//{
 	//	"item_id":501,
@@ -437,7 +437,7 @@ void OriginsDB::update (const Icons& icons, const oro::Timestamp& next_update) {
 	transaction.commit();
 }
 
-void OriginsDB::update (const Shops& shops, const oro::Timestamp& next_update) {
+void OriginsDBSQLite::update (const Shops& shops, const oro::Timestamp& next_update) {
 	//example:
 	//{
 	//	"title":"• B\u003ePoison Bottle •",
@@ -520,7 +520,7 @@ void OriginsDB::update (const Shops& shops, const oro::Timestamp& next_update) {
 	transaction.commit();
 }
 
-void OriginsDB::update (const Creators& creat, const oro::Timestamp& next_update) {
+void OriginsDBSQLite::update (const Creators& creat, const oro::Timestamp& next_update) {
 	std::unique_lock<std::mutex> lock(m_db_mutex);
 	auto& db = *m_db;
 	update_last_access(db, DBOperation::Creators, next_update);
@@ -543,7 +543,7 @@ void OriginsDB::update (const Creators& creat, const oro::Timestamp& next_update
 	transaction.commit();
 }
 
-Timestamp OriginsDB::next_access_time (DBOperation op) const {
+Timestamp OriginsDBSQLite::next_access_time (DBOperation op) const {
 	constexpr auto select_last_acces_str = make_select_last_acces_str();
 	SQLite::Statement sel_last(
 		*m_db,

src/oro/private/originsdb_sqlite.hpp

@@ -17,8 +17,7 @@
 
 #pragma once
 
-#include "datatypes.hpp"
-#include "oro/dboperation.hpp"
+#include "oro/originsdb.hpp"
 #include <mutex>
 #include <string_view>
 #include <string>
@@ -30,22 +29,17 @@ class Database;
 
 namespace oro {
 
-struct Items;
-struct Icons;
-struct Shops;
-struct Creators;
-
-class OriginsDB {
+class OriginsDBSQLite : public OriginsDB {
 public:
-	explicit OriginsDB(std::string_view path);
-	~OriginsDB() noexcept;
+	explicit OriginsDBSQLite(std::string_view path);
+	virtual ~OriginsDBSQLite() noexcept;
 
-	void update (const Items& items, const oro::Timestamp& next_update);
-	void update (const Icons& icons, const oro::Timestamp& next_update);
-	void update (const Shops& shops, const oro::Timestamp& next_update);
-	void update (const Creators& creat, const oro::Timestamp& next_update);
+	void update (const Items& items, const oro::Timestamp& next_update) override;
+	void update (const Icons& icons, const oro::Timestamp& next_update) override;
+	void update (const Shops& shops, const oro::Timestamp& next_update) override;
+	void update (const Creators& creat, const oro::Timestamp& next_update) override;
 
-	Timestamp next_access_time (DBOperation op) const;
+	Timestamp next_access_time (DBOperation op) const override;
 
 private:
 	std::string m_path;