Add project files.

1 files changed, 123 insertions, 0 deletions

diff --git a/Plugins/SessionProvider/SessionClientEntryPoint.cs b/Plugins/SessionProvider/SessionClientEntryPoint.cs
new file mode 100644
index 0000000..07be1ef
--- /dev/null
+++ b/Plugins/SessionProvider/SessionClientEntryPoint.cs
@@ -0,0 +1,123 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+
+using VNLib.Net.Http;
+using VNLib.Utils.Logging;
+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
+    {        
+        public override string PluginName => "Essentials.Sessions";
+
+        
+        private readonly List<AssemblyLoader<IRuntimeSessionProvider>> ProviderLoaders = new();
+
+        private IRuntimeSessionProvider[] ProviderArray = Array.Empty<IRuntimeSessionProvider>();
+        
+
+        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()
+        {
+            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<IRuntimeSessionProvider> prov =  this.LoadAssembly<IRuntimeSessionProvider>(asm);
+
+                    //Create localized log
+                    LocalizedLogProvider log = new(Log, $"{Path.GetFileName(asm)}");
+
+                    //Try to load the websessions
+                    prov.Resource.Load(this, log);
+
+                    //Add provider to list
+                    ProviderLoaders.Add(prov);
+                }
+
+                if(ProviderLoaders.Count > 0)
+                {
+                    //Create array for searching for providers
+                    ProviderArray = ProviderLoaders.Select(s => s.Resource).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
+                ProviderLoaders.ForEach(s => s.Dispose());
+
+                Log.Warn("Plugin configuration was missing required variables {var}", knf.Message);
+            }
+            catch
+            {
+                //Dispose providers
+                ProviderLoaders.ForEach(s => s.Dispose());
+                throw;
+            }
+        }
+      
+        protected override void OnUnLoad()
+        {
+            //Clear array
+            ProviderArray = Array.Empty<IRuntimeSessionProvider>();
+
+            //Cleanup assemblies
+            ProviderLoaders.ForEach(p => p.Dispose());
+            ProviderLoaders.Clear();
+
+            Log.Information("Plugin unloaded");
+        }
+
+        protected override void ProcessHostCommand(string cmd)
+        {
+            if (!this.IsDebug())
+            {
+                return;
+            }
+        }
+    }
+}