From 84cc69573bb522122606c3bc29c8ab188d4ccf70 Mon Sep 17 00:00:00 2001
From: Mike Mazur
Date: Fri, 25 Jul 2008 07:16:27 +0000
Subject: Thanks, lulurun, for a patch that adds an authenticated session cache
 to reduce "check_auth_session" requests from inventory server to user server.

---
 .../Communications/Cache/AuthedSessionCache.cs     | 107 +++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 OpenSim/Framework/Communications/Cache/AuthedSessionCache.cs

(limited to 'OpenSim/Framework/Communications')

diff --git a/OpenSim/Framework/Communications/Cache/AuthedSessionCache.cs b/OpenSim/Framework/Communications/Cache/AuthedSessionCache.cs
new file mode 100644
index 0000000..b989997
--- /dev/null
+++ b/OpenSim/Framework/Communications/Cache/AuthedSessionCache.cs
@@ -0,0 +1,107 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenSim.Framework.Communications.Cache
+{
+    public class AuthedSessionCache
+    {
+        public class CacheData
+        {
+            private static readonly DateTime UNIX_EPOCH = new DateTime(1970, 1, 1);
+            private string m_session_id;
+            private string m_agent_id;
+            private int m_expire;
+
+            private int get_current_unix_time()
+            {
+                return (int)(DateTime.UtcNow - UNIX_EPOCH).TotalSeconds;
+            }
+
+            public CacheData(string sid, string aid)
+            {
+                m_session_id = sid;
+                m_agent_id = aid;
+                m_expire = get_current_unix_time() + DEFAULT_LIFETIME;
+            }
+
+            public CacheData(string sid, string aid, int time_now)
+            {
+                m_session_id = sid;
+                m_agent_id = aid;
+                m_expire = time_now + DEFAULT_LIFETIME;
+            }
+
+            public string SessionID
+            {
+                get { return m_session_id; }
+                set { m_session_id = value; }
+            }
+
+            public string AgentID
+            {
+                get { return m_agent_id; }
+                set { m_agent_id = value; }
+            }
+
+            public bool isExpired
+            {
+                get { return m_expire < get_current_unix_time(); }
+            }
+
+            public void Renew()
+            {
+                m_expire = get_current_unix_time() + DEFAULT_LIFETIME;
+            }
+        }
+
+        private static readonly int DEFAULT_LIFETIME = 30;
+        private Dictionary<string, CacheData> m_authed_sessions = new Dictionary<string,CacheData>();
+        private int m_session_lifetime = DEFAULT_LIFETIME;
+
+        public AuthedSessionCache()
+        {
+            m_session_lifetime = DEFAULT_LIFETIME;
+        }
+
+        public AuthedSessionCache(int timeout)
+        {
+            m_session_lifetime = timeout;
+        }
+
+        public CacheData getCachedSession(string session_id, string agent_id)
+        {
+            CacheData ret = null;
+            lock (m_authed_sessions)
+            {
+                if (m_authed_sessions.ContainsKey(session_id))
+                {
+                    CacheData cached_session = m_authed_sessions[session_id];
+                    if (!cached_session.isExpired && cached_session.AgentID == agent_id)
+                    {
+                        ret = m_authed_sessions[session_id];
+                        // auto renew
+                        m_authed_sessions[session_id].Renew();
+                    }
+                }
+            }
+            return ret;
+        }
+
+        public void Add(string session_id, string agent_id)
+        {
+            CacheData data = new CacheData(session_id, agent_id);
+            lock (m_authed_sessions)
+            {
+                if (m_authed_sessions.ContainsKey(session_id))
+                {
+                    m_authed_sessions[session_id] = data;
+                }
+                else
+                {
+                    m_authed_sessions.Add(session_id, data);
+                }
+            }
+        }
+    }
+}
-- 
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