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using System;
using System.Linq;
using System.Threading;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using VNLib.Utils.Logging;
using VNLib.Utils.Extensions;
using VNLib.Plugins.Essentials.Users;
namespace VNLib.Plugins.Extensions.Loading.Users
{
/// <summary>
/// Contains extension methods for plugins to load the "users" system
/// </summary>
public static class UserLoading
{
public const string USER_CUSTOM_ASSEMBLY = "user_custom_asm";
public const string DEFAULT_USER_ASM = "VNLib.Plugins.Essentials.Users.dll";
public const string ONLOAD_METHOD_NAME = "OnPluginLoading";
private static readonly ConditionalWeakTable<PluginBase, Lazy<IUserManager>> UsersTable = new();
/// <summary>
/// Gets or loads the plugin's ambient <see cref="IUserManager"/>, with the specified user-table name,
/// or the default table name
/// </summary>
/// <param name="plugin"></param>
/// <returns>The ambient <see cref="IUserManager"/> for the current plugin</returns>
/// <exception cref="KeyNotFoundException"></exception>
/// <exception cref="ObjectDisposedException"></exception>
public static IUserManager GetUserManager(this PluginBase plugin)
{
plugin.ThrowIfUnloaded();
//Get stored or load
return UsersTable.GetValue(plugin, LoadUsers).Value;
}
private static Lazy<IUserManager> LoadUsers(PluginBase pbase)
{
//lazy callack
IUserManager LoadManager()
{
//Try to load a custom user assembly for exporting IUserManager
string? customAsm = pbase.PluginConfig.GetPropString(USER_CUSTOM_ASSEMBLY);
//See if host config defined the path
customAsm ??= pbase.HostConfig.GetPropString(USER_CUSTOM_ASSEMBLY);
//Finally default
customAsm ??= DEFAULT_USER_ASM;
//Try to load a custom assembly
AssemblyLoader<IUserManager> loader = pbase.LoadAssembly<IUserManager>(customAsm);
try
{
//Get the runtime type
Type runtimeType = loader.Resource.GetType();
//Get the onplugin load method
Action<object>? onLoadMethod = runtimeType.GetMethods()
.Where(static p => p.IsPublic && !p.IsAbstract && ONLOAD_METHOD_NAME.Equals(p.Name))
.Select(p => p.CreateDelegate<Action<object>>(loader.Resource))
.FirstOrDefault();
//Call the onplugin load method
onLoadMethod?.Invoke(pbase);
if (pbase.IsDebug())
{
pbase.Log.Verbose("Loading user manager from assembly {name}", runtimeType.AssemblyQualifiedName);
}
//Return the loaded instance (may raise exception)
return loader.Resource;
}
catch
{
loader.Dispose();
throw;
}
}
return new Lazy<IUserManager>(LoadManager, LazyThreadSafetyMode.PublicationOnly);
}
}
}
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