UPnP database plugin

[mk: renamed source files, applied coding style, reduced bloat, using
MPD's threading library, using MPD's error reporting and logging
library and refactoring, fixed lots of bugs]

1 files changed, 90 insertions, 0 deletions

diff --git a/src/db/upnp/Discovery.hxx b/src/db/upnp/Discovery.hxx
new file mode 100644
index 000000000..899ac83ab
--- /dev/null
+++ b/src/db/upnp/Discovery.hxx
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2003-2014 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 _UPNPPDISC_H_X_INCLUDED_
+#define _UPNPPDISC_H_X_INCLUDED_
+
+#include "util/Error.hxx"
+
+#include <vector>
+
+#include <time.h>
+
+class ContentDirectoryService;
+
+/**
+ * Manage UPnP discovery and maintain a directory of active devices. Singleton.
+ *
+ * We are only interested in MediaServers with a ContentDirectory service
+ * for now, but this could be made more general, by removing the filtering.
+ */
+class UPnPDeviceDirectory {
+	Error error;
+
+	/**
+	 * The UPnP device search timeout, which should actually be
+	 * called delay because it's the base of a random delay that
+	 * the devices apply to avoid responding all at the same time.
+	 */
+	int m_searchTimeout;
+
+	time_t m_lastSearch;
+
+	UPnPDeviceDirectory();
+public:
+	UPnPDeviceDirectory(const UPnPDeviceDirectory &) = delete;
+	UPnPDeviceDirectory& operator=(const UPnPDeviceDirectory &) = delete;
+
+	/** This class is a singleton. Get the instance here */
+	static UPnPDeviceDirectory *getTheDir();
+
+	/** Retrieve the directory services currently seen on the network */
+	bool getDirServices(std::vector<ContentDirectoryService> &);
+
+	/**
+	 * Get server by friendly name. It's a bit wasteful to copy
+	 * all servers for this, we could directly walk the list. Otoh
+	 * there isn't going to be millions...
+	 */
+	bool getServer(const char *friendlyName,
+		       ContentDirectoryService &server);
+
+	/** My health */
+	bool ok() const {
+		return !error.IsDefined();
+	}
+
+	/** My diagnostic if health is bad */
+	const Error &GetError() const {
+		return error;
+	}
+
+private:
+	bool search();
+
+	/**
+	 * Look at the devices and get rid of those which have not
+	 * been seen for too long. We do this when listing the top
+	 * directory.
+	 */
+	void expireDevices();
+};
+
+
+#endif /* _UPNPPDISC_H_X_INCLUDED_ */