1 files changed, 158 insertions, 0 deletions
diff --git a/plugins/SessionProvider/src/SessionClientEntryPoint.cs b/plugins/SessionProvider/src/SessionClientEntryPoint.cs
new file mode 100644
index 0000000..ae3d166
--- /dev/null
+++ b/plugins/SessionProvider/src/SessionClientEntryPoint.cs
@@ -0,0 +1,158 @@
+/*
+* Copyright (c) 2022 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: SessionProvider
+* File: SessionClientEntryPoint.cs 
+*
+* SessionClientEntryPoint.cs is part of SessionProvider which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* SessionProvider 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.
+*
+* SessionProvider 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.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+
+using VNLib.Utils.Logging;
+using VNLib.Utils.Extensions;
+using VNLib.Net.Http;
+using VNLib.Plugins.Extensions.Loading;
+
+namespace VNLib.Plugins.Essentials.Sessions
+{
+    /// <summary>
+    /// The implementation type for dynamic loading of unified session providers 
+    /// </summary>
+    public sealed class SessionClientEntryPoint : PluginBase, ISessionProvider
+    {       
+        ///<inheritdoc/>
+        public override string PluginName => "Essentials.Sessions";
+
+        private RuntimeSessionProvider[] ProviderArray = Array.Empty<RuntimeSessionProvider>();
+        
+
+        ValueTask<SessionHandle> ISessionProvider.GetSessionAsync(IHttpEvent entity, CancellationToken token)
+        {
+            //Loop through providers
+            for (int i = 0; i < ProviderArray.Length; i++)
+            {
+                //Check if provider can process the entity
+                if (ProviderArray[i].CanProcess(entity))
+                {
+                    //Get session
+                    return ProviderArray[i].GetSessionAsync(entity, token);
+                }
+            }
+
+            //Return empty session
+            return new ValueTask<SessionHandle>(SessionHandle.Empty);
+        }
+
+        protected override void OnLoad()
+        {
+            List<RuntimeSessionProvider> providers = new();
+
+            try
+            {
+                Log.Verbose("Loading all specified session providers");
+
+                //Get all provider names
+                IEnumerable<string> providerAssemblyNames = PluginConfig.GetProperty("provider_assemblies")
+                                                .EnumerateArray()
+                                                .Where(s => s.GetString() != null)
+                                                .Select(s => s.GetString()!);
+
+                
+               
+                foreach(string asm in providerAssemblyNames)
+                {
+                    Log.Verbose("Loading {dll} session provider", asm);
+    
+                    //Attempt to load provider
+                    AssemblyLoader<ISessionProvider> prov =  this.LoadAssembly<ISessionProvider>(asm);
+
+                    try
+                    {
+                        //Create localized log
+                        LocalizedLogProvider log = new(Log, $"{Path.GetFileName(asm)}");
+
+                        RuntimeSessionProvider p = new(prov);
+
+                        //Call load method
+                        p.Load(this, log);
+
+                        //Add to list
+                        providers.Add(p);
+                    }
+                    catch
+                    {
+                        prov.Dispose();
+                        throw;
+                    }
+                }
+
+                if(providers.Count > 0)
+                {
+                    //Create array for searching for providers
+                    ProviderArray = providers.ToArray();
+
+                    Log.Information("Loaded {count} session providers", ProviderArray.Length);
+                }
+                else
+                {
+                    Log.Information("No session providers loaded");
+                }
+
+                Log.Information("Plugin loaded");
+            }
+            catch (KeyNotFoundException knf)
+            {
+                //Dispose providers
+                providers.ForEach(static s => s.Dispose());
+
+                Log.Warn("Plugin configuration was missing required variables {var}", knf.Message);
+            }
+            catch
+            {
+                //Dispose providers
+                providers.ForEach(static s => s.Dispose());
+                throw;
+            }
+        }
+      
+        protected override void OnUnLoad()
+        {
+            //Cleanup assemblies
+            ProviderArray.TryForeach(static p => p.Dispose());
+
+            //Clear array
+            ProviderArray = Array.Empty<RuntimeSessionProvider>();
+
+            Log.Information("Plugin unloaded");
+        }
+
+        protected override void ProcessHostCommand(string cmd)
+        {
+            if (!this.IsDebug())
+            {
+                return;
+            }
+        }
+    }
+}