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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;
using VNLib.Plugins.Essentials.Sessions.Runtime;
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;
}
}
}
}
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