1 files changed, 129 insertions, 0 deletions
diff --git a/libs/VNLib.Plugins.Sessions.Memory/src/MemorySession.cs b/libs/VNLib.Plugins.Sessions.Memory/src/MemorySession.cs
new file mode 100644
index 0000000..c26c281
--- /dev/null
+++ b/libs/VNLib.Plugins.Sessions.Memory/src/MemorySession.cs
@@ -0,0 +1,129 @@
+/*
+* Copyright (c) 2022 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Plugins.Essentials.Sessions.Memory
+* File: MemorySession.cs 
+*
+* MemorySession.cs is part of VNLib.Plugins.Essentials.Sessions.Memory which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Plugins.Essentials.Sessions.Memory is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU Affero General Public License as 
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* VNLib.Plugins.Essentials.Sessions.Memory 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 Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see https://www.gnu.org/licenses/.
+*/
+
+using System;
+using System.Net;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using VNLib.Plugins.Essentials.Extensions;
+
+using VNLib.Utils.Async;
+using VNLib.Net.Http;
+using VNLib.Utils.Memory.Caching;
+using VNLib.Plugins.Essentials.Sessions;
+using static VNLib.Plugins.Essentials.Sessions.ISessionExtensions;
+
+namespace VNLib.Plugins.Sessions.Memory
+{
+    internal class MemorySession : SessionBase, ICacheable
+    {
+        private readonly Dictionary<string, string> DataStorage;
+
+        private readonly Func<IHttpEvent, string, string> OnSessionUpdate;
+        private readonly AsyncQueue<MemorySession> ExpiredTable;
+
+        public MemorySession(string sessionId, IPAddress ipAddress, Func<IHttpEvent, string, string> onSessionUpdate, AsyncQueue<MemorySession> expired)
+        {
+            //Set the initial is-new flag
+            DataStorage = new Dictionary<string, string>(10);
+            ExpiredTable = expired;
+
+            OnSessionUpdate = onSessionUpdate;
+            //Get new session id
+            SessionID = sessionId;
+            UserIP = ipAddress;
+            SessionType = SessionType.Web;
+            Created = DateTimeOffset.UtcNow;
+            //Init 
+            IsNew = true;
+        }
+        //Store in memory directly
+        public override IPAddress UserIP { get; protected set; }
+
+        //Session type has no backing store, so safe to hard-code it's always web
+
+        public override SessionType SessionType => SessionType.Web;
+
+        protected override ValueTask<Task?> UpdateResource(bool isAsync, IHttpEvent state)
+        {
+            //if invalid is set, invalide the current session
+            if (Flags.IsSet(INVALID_MSK))
+            {
+                //Clear storage, and regenerate the sessionid
+                DataStorage.Clear();
+                //store new sessionid
+                SessionID = OnSessionUpdate(state, SessionID);
+                //Reset ip-address
+                UserIP = state.Server.GetTrustedIp();
+                //Update created-time
+                Created = DateTimeOffset.UtcNow;
+                //Re-initialize the session to the state of the current connection
+                this.InitNewSession(state.Server);
+                //Modified flag doesnt matter since there is no write-back
+
+            }
+            else if (Flags.IsSet(REGEN_ID_MSK))
+            {
+                //Regen id without modifying the data store
+                SessionID = OnSessionUpdate(state, SessionID);
+            }
+            //Clear flags
+            Flags.ClearAll();
+            //Memory session always completes 
+            return ValueTask.FromResult<Task?>(null);
+        }
+
+        protected override string IndexerGet(string key)
+        {
+            return DataStorage.GetValueOrDefault(key, string.Empty);
+        }
+
+        protected override void IndexerSet(string key, string value)
+        {
+            //Check for special keys
+            switch (key)
+            {
+                //For tokens/login hashes, we can set the upgrade flag
+                case TOKEN_ENTRY:
+                case LOGIN_TOKEN_ENTRY:
+                    Flags.Set(REGEN_ID_MSK);
+                    break;
+            }
+            DataStorage[key] = value;
+        }
+
+
+        DateTime ICacheable.Expires { get; set; }
+
+        void ICacheable.Evicted()
+        {
+            DataStorage.Clear();
+            //Enque cleanup
+            _ = ExpiredTable.TryEnque(this);
+        }
+
+        bool IEquatable<ICacheable>.Equals(ICacheable? other) => other is ISession ses && SessionID.Equals(ses.SessionID, StringComparison.Ordinal);
+
+    }
+}