1 files changed, 80 insertions, 0 deletions
diff --git a/dnsdist-session-cache.hh b/dnsdist-session-cache.hh
new file mode 100644
index 0000000..1881fb1
--- /dev/null
+++ b/dnsdist-session-cache.hh
@@ -0,0 +1,80 @@
+/*
+ * 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;