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using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Json;
using MediaBrowser.Common.Logging;
using MediaBrowser.Common.Net;
using MediaBrowser.Common.Plugins;
namespace MediaBrowser.Common.Kernel
{
/// <summary>
/// Represents a shared base kernel for both the UI and server apps
/// </summary>
public abstract class BaseKernel<TConfigurationType>
where TConfigurationType : BaseConfiguration, new()
{
/// <summary>
/// Gets the path to the program data folder
/// </summary>
public string ProgramDataPath { get; private set; }
protected string PluginsPath
{
get
{
return Path.Combine(ProgramDataPath, "plugins");
}
}
protected string ConfigurationPath
{
get
{
return Path.Combine(ProgramDataPath, "config.js");
}
}
/// <summary>
/// Gets the current configuration
/// </summary>
public TConfigurationType Configuration { get; private set; }
/// <summary>
/// Gets the list of currently loaded plugins
/// </summary>
[ImportMany(typeof(BasePlugin))]
public IEnumerable<BasePlugin> Plugins { get; private set; }
/// <summary>
/// Both the UI and server will have a built-in HttpServer.
/// People will inevitably want remote control apps so it's needed in the UI too.
/// </summary>
public HttpServer HttpServer { get; private set; }
/// <summary>
/// Gets the kernel context. The UI kernel will have to override this.
/// </summary>
protected KernelContext KernelContext { get { return KernelContext.Server; } }
public BaseKernel()
{
ProgramDataPath = GetProgramDataPath();
Logger.LoggerInstance = new FileLogger(Path.Combine(ProgramDataPath, "Logs"));
}
public virtual void Init()
{
ReloadConfiguration();
ReloadHttpServer();
ReloadComposableParts();
}
protected void ReloadComposableParts()
{
if (!Directory.Exists(PluginsPath))
{
Directory.CreateDirectory(PluginsPath);
}
var catalog = new AggregateCatalog(Directory.GetDirectories(PluginsPath, "*", SearchOption.TopDirectoryOnly).Select(f => new DirectoryCatalog(f)));
//catalog.Catalogs.Add(new AssemblyCatalog(Assembly.GetExecutingAssembly()));
//catalog.Catalogs.Add(new AssemblyCatalog(GetType().Assembly));
new CompositionContainer(catalog).ComposeParts(this);
OnComposablePartsLoaded();
}
protected virtual void OnComposablePartsLoaded()
{
StartPlugins();
}
private void StartPlugins()
{
Parallel.For(0, Plugins.Count(), i =>
{
var plugin = Plugins.ElementAt(i);
plugin.ReloadConfiguration();
if (plugin.Enabled)
{
if (KernelContext == KernelContext.Server)
{
plugin.InitInServer();
}
else
{
plugin.InitInUI();
}
}
});
}
/// <summary>
/// Gets the path to the application's ProgramDataFolder
/// </summary>
private string GetProgramDataPath()
{
string programDataPath = ConfigurationManager.AppSettings["ProgramDataPath"];
// If it's a relative path, e.g. "..\"
if (!Path.IsPathRooted(programDataPath))
{
string path = Assembly.GetExecutingAssembly().Location;
path = Path.GetDirectoryName(path);
programDataPath = Path.Combine(path, programDataPath);
programDataPath = Path.GetFullPath(programDataPath);
}
if (!Directory.Exists(programDataPath))
{
Directory.CreateDirectory(programDataPath);
}
return programDataPath;
}
private void ReloadConfiguration()
{
// Deserialize config
if (!File.Exists(ConfigurationPath))
{
Configuration = new TConfigurationType();
}
else
{
Configuration = JsonSerializer.DeserializeFromFile<TConfigurationType>(ConfigurationPath);
}
Logger.LoggerInstance.LogSeverity = Configuration.LogSeverity;
}
public void SaveConfiguration()
{
JsonSerializer.SerializeToFile(Configuration, ConfigurationPath);
}
private void ReloadHttpServer()
{
if (HttpServer != null)
{
HttpServer.Dispose();
}
HttpServer = new HttpServer("http://+:" + Configuration.HttpServerPortNumber + "/mediabrowser/");
}
private static TConfigurationType GetConfiguration(string directory)
{
string file = Path.Combine(directory, "config.js");
if (!File.Exists(file))
{
return new TConfigurationType();
}
return JsonSerializer.DeserializeFromFile<TConfigurationType>(file);
}
}
}
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