update.{cc,h} -> update_checker.{cc,h}.

1 files changed, 104 insertions, 0 deletions

diff --git a/src/lib/update_checker.h b/src/lib/update_checker.h
new file mode 100644
index 000000000..b82be7808
--- /dev/null
+++ b/src/lib/update_checker.h
@@ -0,0 +1,104 @@
+/*
+    Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+/** @file  src/lib/update.h
+ *  @brief UpdateChecker class.
+ */
+
+#include "signaller.h"
+#include <curl/curl.h>
+#include <boost/signals2.hpp>
+#include <boost/thread/mutex.hpp>
+#include <boost/thread/condition.hpp>
+#include <boost/thread.hpp>
+
+struct update_checker_test;
+
+/** Class to check for the existance of an update for DCP-o-matic on a remote server */
+class UpdateChecker : public Signaller, public boost::noncopyable
+{
+public:
+	UpdateChecker ();
+	~UpdateChecker ();
+
+	void run ();
+
+	enum State {
+		YES,    ///< there is an update
+		FAILED, ///< the check failed, so we don't know
+		NO,     ///< there is no update
+		NOT_RUN ///< the check has not been run (yet)
+	};
+
+	/** @return state of the checker */
+	State state () {
+		boost::mutex::scoped_lock lm (_data_mutex);
+		return _state;
+	}
+
+	/** @return new stable version, if there is one */
+	boost::optional<std::string> stable () {
+		boost::mutex::scoped_lock lm (_data_mutex);
+		return _stable;
+	}
+
+	/** @return new test version, if there is one and Config is set to look for it */
+	boost::optional<std::string> test () {
+		boost::mutex::scoped_lock lm (_data_mutex);
+		return _test;
+	}
+
+	/** @return true if the last signal emission was the first */
+	bool last_emit_was_first () const {
+		boost::mutex::scoped_lock lm (_data_mutex);
+		return _emits == 1;
+	}
+
+	size_t write_callback (void *, size_t, size_t);
+
+	boost::signals2::signal<void (void)> StateChanged;
+
+	static UpdateChecker* instance ();
+
+private:
+	friend struct update_checker_test;
+
+	static UpdateChecker* _instance;
+
+	static bool version_less_than (std::string const & a, std::string const & b);
+
+	void set_state (State);
+	void thread ();
+
+	char* _buffer;
+	int _offset;
+	CURL* _curl;
+
+	/** mutex to protect _state, _stable, _test and _emits */
+	mutable boost::mutex _data_mutex;
+	State _state;
+	boost::optional<std::string> _stable;
+	boost::optional<std::string> _test;
+	int _emits;
+
+	boost::thread* _thread;
+	boost::mutex _process_mutex;
+	boost::condition _condition;
+	int _to_do;
+};