input/tidal: new input plugin to receive Tidal streams

src/input/plugins/TidalSessionManager.cxx

@@ -0,0 +1,106 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "TidalSessionManager.hxx"
+#include "lib/curl/Global.hxx"
+
+TidalSessionManager::TidalSessionManager(EventLoop &event_loop,
+					 const char *_base_url, const char *_token,
+					 const char *_username,
+					 const char *_password) noexcept
+	:base_url(_base_url), token(_token),
+	 username(_username), password(_password),
+	 curl(event_loop),
+	 defer_invoke_handlers(event_loop,
+			       BIND_THIS_METHOD(InvokeHandlers))
+{
+}
+
+TidalSessionManager::~TidalSessionManager() noexcept
+{
+	assert(handlers.empty());
+}
+
+void
+TidalSessionManager::AddLoginHandler(TidalSessionHandler &h) noexcept
+{
+	const std::lock_guard<Mutex> protect(mutex);
+	assert(!h.is_linked());
+
+	const bool was_empty = handlers.empty();
+	handlers.push_front(h);
+
+	if (was_empty && session.empty() && !login_request) {
+		// TODO: throttle login attempts?
+
+		std::string login_uri(base_url);
+		login_uri += "/login/username";
+
+		try {
+			TidalLoginHandler &handler = *this;
+			login_request =
+				std::make_unique<TidalLoginRequest>(*curl, base_url,
+								    token,
+								    username, password,
+								    handler);
+		} catch (...) {
+			error = std::current_exception();
+			ScheduleInvokeHandlers();
+			return;
+		}
+	}
+}
+
+void
+TidalSessionManager::OnTidalLoginSuccess(std::string &&_session) noexcept
+{
+	{
+		const std::lock_guard<Mutex> protect(mutex);
+		session = std::move(_session);
+	}
+
+	ScheduleInvokeHandlers();
+}
+
+void
+TidalSessionManager::OnTidalLoginError(std::exception_ptr e) noexcept
+{
+	{
+		const std::lock_guard<Mutex> protect(mutex);
+		error = e;
+	}
+
+	ScheduleInvokeHandlers();
+}
+
+void
+TidalSessionManager::InvokeHandlers() noexcept
+{
+	const std::lock_guard<Mutex> protect(mutex);
+	while (!handlers.empty()) {
+		auto &h = handlers.front();
+		handlers.pop_front();
+
+		const ScopeUnlock unlock(mutex);
+		h.OnTidalSession();
+	}
+
+	login_request.reset();
+}