input/tidal: new input plugin to receive Tidal streams

src/input/plugins/TidalSessionManager.hxx

@@ -0,0 +1,144 @@
+/*
+ * Copyright 2003-2018 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef TIDAL_SESSION_MANAGER_HXX
+#define TIDAL_SESSION_MANAGER_HXX
+
+#include "check.h"
+#include "TidalLoginRequest.hxx"
+#include "lib/curl/Init.hxx"
+#include "thread/Mutex.hxx"
+#include "event/DeferEvent.hxx"
+
+#include <boost/intrusive/list.hpp>
+
+#include <memory>
+#include <string>
+
+class CurlRequest;
+class TidalLoginRequest;
+
+class TidalSessionHandler
+	: public boost::intrusive::list_base_hook<boost::intrusive::link_mode<boost::intrusive::safe_link>>
+{
+public:
+	virtual void OnTidalSession() noexcept = 0;
+};
+
+class TidalSessionManager final : TidalLoginHandler {
+	/**
+	 * The Tidal API base URL.
+	 */
+	const char *const base_url;
+
+	/**
+	 * The configured Tidal application token.
+	 */
+	const char *const token;
+
+	/**
+	 * The configured Tidal user name.
+	 */
+	const char *const username;
+
+	/**
+	 * The configured Tidal password.
+	 */
+	const char *const password;
+
+	CurlInit curl;
+
+	DeferEvent defer_invoke_handlers;
+
+	/**
+	 * Protects #session, #error and #handlers.
+	 */
+	mutable Mutex mutex;
+
+	std::exception_ptr error;
+
+	/**
+	 * The current Tidal session id, empty if none.
+	 */
+	std::string session;
+
+	typedef boost::intrusive::list<TidalSessionHandler,
+				       boost::intrusive::constant_time_size<false>> LoginHandlerList;
+
+	LoginHandlerList handlers;
+
+	std::unique_ptr<TidalLoginRequest> login_request;
+
+public:
+	TidalSessionManager(EventLoop &event_loop,
+			    const char *_base_url, const char *_token,
+			    const char *_username,
+			    const char *_password) noexcept;
+
+	~TidalSessionManager() noexcept;
+
+	EventLoop &GetEventLoop() noexcept {
+		return defer_invoke_handlers.GetEventLoop();
+	}
+
+	CurlGlobal &GetCurl() noexcept {
+		return *curl;
+	}
+
+	const char *GetBaseUrl() const noexcept {
+		return base_url;
+	}
+
+	void AddLoginHandler(TidalSessionHandler &h) noexcept;
+
+	void RemoveLoginHandler(TidalSessionHandler &h) noexcept {
+		const std::lock_guard<Mutex> protect(mutex);
+		if (h.is_linked())
+			handlers.erase(handlers.iterator_to(h));
+	}
+
+	const char *GetToken() const noexcept {
+		return token;
+	}
+
+	std::string GetSession() const {
+		const std::lock_guard<Mutex> protect(mutex);
+
+		if (error)
+			std::rethrow_exception(error);
+
+		if (session.empty())
+			throw std::runtime_error("No session");
+
+		return session;
+	}
+
+private:
+	void InvokeHandlers() noexcept;
+
+	void ScheduleInvokeHandlers() noexcept {
+		defer_invoke_handlers.Schedule();
+	}
+
+	/* virtual methods from TidalLoginHandler */
+	void OnTidalLoginSuccess(std::string &&session) noexcept override;
+	void OnTidalLoginError(std::exception_ptr error) noexcept override;
+};
+
+#endif