mirror of
https://github.com/jellyfin/jellyfin.git
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289 lines
9.6 KiB
C#
289 lines
9.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.ComponentModel.Composition.Hosting;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Threading.Tasks;
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using MediaBrowser.Common.Logging;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Common.Plugins;
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using MediaBrowser.Common.Serialization;
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using MediaBrowser.Model.Configuration;
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using MediaBrowser.Model.Progress;
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namespace MediaBrowser.Common.Kernel
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{
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/// <summary>
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/// Represents a shared base kernel for both the UI and server apps
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/// </summary>
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public abstract class BaseKernel<TConfigurationType, TApplicationPathsType> : IDisposable, IKernel
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where TConfigurationType : BaseApplicationConfiguration, new()
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where TApplicationPathsType : BaseApplicationPaths, new()
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{
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/// <summary>
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/// Gets the current configuration
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/// </summary>
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public TConfigurationType Configuration { get; private set; }
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public TApplicationPathsType ApplicationPaths { get; private set; }
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/// <summary>
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/// Gets the list of currently loaded plugins
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/// </summary>
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[ImportMany(typeof(BasePlugin))]
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public IEnumerable<BasePlugin> Plugins { get; private set; }
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/// <summary>
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/// Both the UI and server will have a built-in HttpServer.
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/// People will inevitably want remote control apps so it's needed in the UI too.
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/// </summary>
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public HttpServer HttpServer { get; private set; }
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protected virtual string HttpServerUrlPrefix
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{
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get
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{
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return "http://+:" + Configuration.HttpServerPortNumber + "/mediabrowser/";
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}
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}
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/// <summary>
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/// Gets the kernel context. Subclasses will have to override.
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/// </summary>
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public abstract KernelContext KernelContext { get; }
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public BaseKernel()
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{
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ApplicationPaths = new TApplicationPathsType();
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}
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public virtual async Task Init(IProgress<TaskProgress> progress)
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{
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ReloadLogger();
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progress.Report(new TaskProgress() { Description = "Loading configuration", PercentComplete = 0 });
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ReloadConfiguration();
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progress.Report(new TaskProgress() { Description = "Starting Http server", PercentComplete = 5 });
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ReloadHttpServer();
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progress.Report(new TaskProgress() { Description = "Loading Plugins", PercentComplete = 10 });
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await ReloadComposableParts().ConfigureAwait(false);
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}
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/// <summary>
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/// Gets or sets the path to the current log file
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/// </summary>
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public static string LogFilePath { get; set; }
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private void ReloadLogger()
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{
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DisposeLogger();
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DateTime now = DateTime.Now;
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LogFilePath = Path.Combine(ApplicationPaths.LogDirectoryPath, "log-" + now.ToString("dMyyyy") + "-" + now.Ticks + ".log");
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FileStream fs = new FileStream(LogFilePath, FileMode.Append, FileAccess.Write, FileShare.Read);
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Logger.LoggerInstance = new StreamLogger(fs);
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}
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/// <summary>
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/// Uses MEF to locate plugins
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/// Subclasses can use this to locate types within plugins
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/// </summary>
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protected virtual Task ReloadComposableParts()
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{
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return Task.Run(() =>
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{
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DisposeComposableParts();
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var container = GetCompositionContainer(includeCurrentAssembly: true);
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container.ComposeParts(this);
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OnComposablePartsLoaded();
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container.Catalog.Dispose();
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container.Dispose();
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});
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}
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public CompositionContainer GetCompositionContainer(bool includeCurrentAssembly = false)
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{
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// Gets all plugin assemblies by first reading all bytes of the .dll and calling Assembly.Load against that
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// This will prevent the .dll file from getting locked, and allow us to replace it when needed
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IEnumerable<Assembly> pluginAssemblies = Directory.GetFiles(ApplicationPaths.PluginsPath, "*.dll", SearchOption.TopDirectoryOnly).Select(f => Assembly.Load(File.ReadAllBytes((f))));
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var catalog = new AggregateCatalog(pluginAssemblies.Select(a => new AssemblyCatalog(a)));
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// Include composable parts in the Common assembly
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// Uncomment this if it's ever needed
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//catalog.Catalogs.Add(new AssemblyCatalog(Assembly.GetExecutingAssembly()));
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if (includeCurrentAssembly)
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{
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// Include composable parts in the subclass assembly
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catalog.Catalogs.Add(new AssemblyCatalog(GetType().Assembly));
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}
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return new CompositionContainer(catalog);
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}
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/// <summary>
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/// Fires after MEF finishes finding composable parts within plugin assemblies
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/// </summary>
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protected virtual void OnComposablePartsLoaded()
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{
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// This event handler will allow any plugin to reference another
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AppDomain.CurrentDomain.AssemblyResolve -= new ResolveEventHandler(CurrentDomain_AssemblyResolve);
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AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve);
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StartPlugins();
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}
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/// <summary>
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/// Initializes all plugins
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/// </summary>
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private void StartPlugins()
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{
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foreach (BasePlugin plugin in Plugins)
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{
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plugin.Initialize(this);
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}
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}
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/// <summary>
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/// Reloads application configuration from the config file
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/// </summary>
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protected virtual void ReloadConfiguration()
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{
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//Configuration information for anything other than server-specific configuration will have to come via the API... -ebr
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// Deserialize config
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if (!File.Exists(ApplicationPaths.SystemConfigurationFilePath))
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{
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Configuration = new TConfigurationType();
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}
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else
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{
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Configuration = XmlSerializer.DeserializeFromFile<TConfigurationType>(ApplicationPaths.SystemConfigurationFilePath);
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}
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Logger.LoggerInstance.LogSeverity = Configuration.EnableDebugLevelLogging ? LogSeverity.Debug : LogSeverity.Info;
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}
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/// <summary>
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/// Restarts the Http Server, or starts it if not currently running
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/// </summary>
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private void ReloadHttpServer()
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{
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DisposeHttpServer();
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HttpServer = new HttpServer(HttpServerUrlPrefix);
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}
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/// <summary>
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/// This snippet will allow any plugin to reference another
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/// </summary>
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Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
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{
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AssemblyName assemblyName = new AssemblyName(args.Name);
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// Look for the .dll recursively within the plugins directory
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string dll = Directory.GetFiles(ApplicationPaths.PluginsPath, "*.dll", SearchOption.AllDirectories)
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.FirstOrDefault(f => Path.GetFileNameWithoutExtension(f) == assemblyName.Name);
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// If we found a matching assembly, load it now
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if (!string.IsNullOrEmpty(dll))
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{
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return Assembly.Load(File.ReadAllBytes(dll));
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}
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return null;
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}
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/// <summary>
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/// Disposes all resources currently in use.
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/// </summary>
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public virtual void Dispose()
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{
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DisposeComposableParts();
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DisposeHttpServer();
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DisposeLogger();
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}
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/// <summary>
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/// Disposes all objects gathered through MEF composable parts
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/// </summary>
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protected virtual void DisposeComposableParts()
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{
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DisposePlugins();
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}
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/// <summary>
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/// Disposes all plugins
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/// </summary>
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private void DisposePlugins()
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{
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if (Plugins != null)
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{
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foreach (BasePlugin plugin in Plugins)
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{
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plugin.Dispose();
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}
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}
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}
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/// <summary>
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/// Disposes the current HttpServer
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/// </summary>
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private void DisposeHttpServer()
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{
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if (HttpServer != null)
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{
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HttpServer.Dispose();
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}
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}
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/// <summary>
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/// Disposes the current Logger instance
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/// </summary>
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private void DisposeLogger()
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{
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if (Logger.LoggerInstance != null)
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{
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Logger.LoggerInstance.Dispose();
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}
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}
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/// <summary>
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/// Gets the current application version
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/// </summary>
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public Version ApplicationVersion
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{
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get
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{
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return GetType().Assembly.GetName().Version;
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}
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}
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BaseApplicationPaths IKernel.ApplicationPaths
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{
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get { return ApplicationPaths; }
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}
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}
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public interface IKernel
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{
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BaseApplicationPaths ApplicationPaths { get; }
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KernelContext KernelContext { get; }
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Task Init(IProgress<TaskProgress> progress);
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void Dispose();
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}
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}
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