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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using MediaBrowser.Common.Kernel;
namespace MediaBrowser.Common.Plugins
{
/// <summary>
/// Manages Plugins within the PluginsPath directory
/// </summary>
public class PluginController
{
public string PluginsPath { get; set; }
/// <summary>
/// Gets the list of currently loaded plugins
/// </summary>
public IEnumerable<IPlugin> Plugins { get; private set; }
/// <summary>
/// Initializes the controller
/// </summary>
public void Init(KernelContext context)
{
AppDomain.CurrentDomain.AssemblyResolve -= new ResolveEventHandler(CurrentDomain_AssemblyResolve);
AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve);
Plugins = GetAllPlugins();
Parallel.For(0, Plugins.Count(), i =>
{
Plugins.ElementAt(i).Init();
});
}
/// <summary>
/// Gets all plugins within PluginsPath
/// </summary>
/// <returns></returns>
private IEnumerable<IPlugin> GetAllPlugins()
{
if (!Directory.Exists(PluginsPath))
{
Directory.CreateDirectory(PluginsPath);
}
List<IPlugin> plugins = new List<IPlugin>();
foreach (string folder in Directory.GetDirectories(PluginsPath, "*", SearchOption.TopDirectoryOnly))
{
IPlugin plugin = GetPluginFromDirectory(folder);
plugin.Path = folder;
if (plugin != null)
{
plugins.Add(plugin);
}
}
return plugins;
}
private IPlugin GetPluginFromDirectory(string path)
{
string dll = Directory.GetFiles(path, "*.dll", SearchOption.TopDirectoryOnly).FirstOrDefault();
if (!string.IsNullOrEmpty(dll))
{
return GetPluginFromDll(dll);
}
return null;
}
private IPlugin GetPluginFromDll(string path)
{
return GetPluginFromDll(Assembly.Load(File.ReadAllBytes(path)));
}
private IPlugin GetPluginFromDll(Assembly assembly)
{
var plugin = assembly.GetTypes().Where(type => typeof(IPlugin).IsAssignableFrom(type)).FirstOrDefault();
if (plugin != null)
{
return plugin.GetConstructor(Type.EmptyTypes).Invoke(null) as IPlugin;
}
return null;
}
Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
{
AssemblyName assemblyName = new AssemblyName(args.Name);
IEnumerable<string> dllPaths = Directory.GetFiles(PluginsPath, "*.dll", SearchOption.AllDirectories);
string dll = dllPaths.FirstOrDefault(f => Path.GetFileNameWithoutExtension(f) == assemblyName.Name);
if (!string.IsNullOrEmpty(dll))
{
return Assembly.Load(File.ReadAllBytes(dll));
}
return null;
}
}
}
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