[DB] Reworked feature extraction

src/feature/FeatureStore.cpp

@@ -0,0 +1,145 @@
+/*
+ * Copyright (C) 2016 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/>.
+ */
+
+#include <boost/property_tree/json_parser.hpp>
+
+#include "logger/Logger.hpp"
+#include "config/Config.hpp"
+
+#include "FeatureStore.hpp"
+
+namespace Feature {
+
+Store::Store()
+{
+}
+
+Store&
+Store::instance(void)
+{
+	static Store instance;
+	return instance;
+}
+
+void
+Store::reload(void)
+{
+	_storePath = Config::instance().getString("features-dir-path", "");
+
+	if (!boost::filesystem::is_directory(_storePath))
+	{
+		LMS_LOG(DBUPDATER, ERROR) << "Feature directory '" << _storePath << "' not valid!";
+		throw std::runtime_error("Invalid feature directory '" + _storePath.string());
+	}
+}
+
+boost::filesystem::path getPath(boost::filesystem::path root, std::string mbid, std::string type)
+{
+	return root / (mbid + "_" + type);
+}
+
+bool
+Store::exists(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type)
+{
+	if (_storePath.empty())
+		reload();
+
+	Wt::Dbo::Transaction transaction(session);
+
+	auto track = Database::Track::getById(session, trackId);
+	std::string mbid = track->getMBID();
+
+	transaction.commit();
+
+	if (mbid.empty())
+		return false;
+
+	boost::filesystem::path path = getPath(_storePath, mbid, type);
+	return boost::filesystem::exists(path);
+}
+
+bool
+Store::get(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type, Type& feature)
+{
+	if (_storePath.empty())
+		reload();
+
+	Wt::Dbo::Transaction transaction(session);
+
+	auto track = Database::Track::getById(session, trackId);
+	std::string mbid = track->getMBID();
+
+	transaction.commit();
+
+	if (mbid.empty())
+		return false;
+
+	boost::filesystem::path path = getPath(_storePath, mbid, type);
+	if (!boost::filesystem::exists(path))
+		return false;
+
+	try
+	{
+		std::ifstream iss(path.string().c_str(), std::ios::in);
+		boost::property_tree::json_parser::read_json(iss, feature);
+	}
+	catch (boost::property_tree::ptree_error& e)
+	{
+		LMS_LOG(FEATURE, ERROR) << "JSON parsing failed: " << e.what();
+		return false;
+	}
+
+	return true;
+}
+
+
+bool
+Store::set(Wt::Dbo::Session& session, Database::Track::id_type trackId, std::string type, const Type& feature)
+{
+	if (_storePath.empty())
+		reload();
+
+	Wt::Dbo::Transaction transaction(session);
+
+	auto track = Database::Track::getById(session, trackId);
+	std::string mbid = track->getMBID();
+
+	transaction.commit();
+
+	if (mbid.empty())
+		return false;
+
+	boost::filesystem::path path = getPath(_storePath, mbid, type);
+
+	try
+	{
+		std::ofstream oss(path.string().c_str(), std::ios::out);
+		boost::property_tree::json_parser::write_json(oss, feature);
+	}
+	catch (boost::property_tree::ptree_error& e)
+	{
+		LMS_LOG(FEATURE, ERROR) << "JSON writing failed: " << e.what();
+		return false;
+	}
+
+	return true;
+}
+
+} // namespace CoverArt
+