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diff --git a/controller/RethinkDB.hpp b/controller/RethinkDB.hpp
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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2018  ZeroTier, Inc.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef ZT_CONTROLLER_USE_RETHINKDB
+
+#ifndef ZT_CONTROLLER_RETHINKDB_HPP
+#define ZT_CONTROLLER_RETHINKDB_HPP
+
+#include "DB.hpp"
+
+#define ZT_CONTROLLER_RETHINKDB_COMMIT_THREADS 4
+
+namespace ZeroTier
+{
+
+/**
+ * A controller database driver that talks to RethinkDB
+ *
+ * This is for use with ZeroTier Central. Others are free to build and use it
+ * but be aware that we might change it at any time.
+ */
+class RethinkDB : public DB
+{
+public:
+	RethinkDB(EmbeddedNetworkController *const nc,const Identity &myId,const char *path);
+	virtual ~RethinkDB();
+
+	virtual bool waitForReady();
+	virtual void save(nlohmann::json *orig,nlohmann::json &record);
+	virtual void eraseNetwork(const uint64_t networkId);
+	virtual void eraseMember(const uint64_t networkId,const uint64_t memberId);
+	virtual void nodeIsOnline(const uint64_t networkId,const uint64_t memberId,const InetAddress &physicalAddress);
+
+protected:
+	struct _PairHasher
+	{
+		inline std::size_t operator()(const std::pair<uint64_t,uint64_t> &p) const { return (std::size_t)(p.first ^ p.second); }
+	};
+
+	std::string _host;
+	std::string _db;
+	std::string _auth;
+	int _port;
+
+	void *_networksDbWatcherConnection;
+	void *_membersDbWatcherConnection;
+	std::thread _networksDbWatcher;
+	std::thread _membersDbWatcher;
+
+	BlockingQueue< nlohmann::json * > _commitQueue;
+	std::thread _commitThread[ZT_CONTROLLER_RETHINKDB_COMMIT_THREADS];
+
+	std::unordered_map< std::pair<uint64_t,uint64_t>,std::pair<int64_t,InetAddress>,_PairHasher > _lastOnline;
+	mutable std::mutex _lastOnline_l;
+	std::thread _onlineNotificationThread;
+
+	std::thread _heartbeatThread;
+
+	mutable std::mutex _readyLock; // locked until ready
+	std::atomic<int> _ready;
+	std::atomic<int> _run;
+	mutable volatile bool _waitNoticePrinted;
+};
+
+} // namespace ZeroTier
+
+#endif
+
+#endif // ZT_CONTROLLER_USE_RETHINKDB