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+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * 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.
+ */
+#pragma once
+
+#include <deque>
+#include <map>
+
+#include "lock.hh"
+#include "tcpiohandler.hh"
+#include "uuid-utils.hh"
+
+class TLSSessionCache
+{
+public:
+ TLSSessionCache()
+ {
+ }
+
+ void putSessions(const boost::uuids::uuid& backendID, time_t now, std::vector<std::unique_ptr<TLSSession>>&& sessions);
+ std::unique_ptr<TLSSession> getSession(const boost::uuids::uuid& backendID, time_t now);
+
+ static void setCleanupDelay(time_t delay)
+ {
+ s_cleanupDelay = delay;
+ }
+
+ static void setSessionValidity(time_t validity)
+ {
+ s_sessionValidity = validity;
+ }
+
+ static void setMaxTicketsPerBackend(uint16_t max)
+ {
+ s_maxSessionsPerBackend = max;
+ }
+
+ size_t getSize();
+
+private:
+ static time_t s_cleanupDelay;
+ static time_t s_sessionValidity;
+ static uint16_t s_maxSessionsPerBackend;
+
+ struct BackendEntry
+ {
+ std::deque<std::unique_ptr<TLSSession>> d_sessions;
+ time_t d_lastUsed{0};
+ };
+
+ struct CacheData
+ {
+ // do we need to shard this?
+ std::map<boost::uuids::uuid, BackendEntry> d_sessions;
+ time_t d_nextCleanup{0};
+ };
+ LockGuarded<CacheData> d_data;
+
+ void cleanup(time_t now, LockGuardedHolder<CacheData>& data);
+};
+
+extern TLSSessionCache g_sessionCache;