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Switched to MEF as a means to locate plugins and resolvers

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LukePulverenti Luke Pulverenti luke pulverenti
2012-07-25 22:33:11 -04:00
parent 84af205572
commit 97ee9fed14
32 changed files with 181 additions and 281 deletions
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37
MediaBrowser.Common/Configuration/ConfigurationController.cs
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@@ -1,37 +0,0 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using MediaBrowser.Common.Json;
namespace MediaBrowser.Common.Configuration
{
public class ConfigurationController<TConfigurationType>
where TConfigurationType : BaseConfiguration, new ()
{
/// <summary>
/// The path to the configuration file
/// </summary>
public string Path { get; set; }
public TConfigurationType Configuration { get; set; }
public void Reload()
{
if (!File.Exists(Path))
{
Configuration = new TConfigurationType();
}
else
{
Configuration = JsonSerializer.DeserializeFromFile<TConfigurationType>(Path);
}
}
public void Save()
{
}
}
}

109
MediaBrowser.Common/Kernel/BaseKernel.cs
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@@ -1,6 +1,11 @@
using System.Configuration;
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;
@@ -12,8 +17,7 @@ namespace MediaBrowser.Common.Kernel
/// <summary>
/// Represents a shared base kernel for both the UI and server apps
/// </summary>
public abstract class BaseKernel<TConfigurationContorllerType, TConfigurationType>
where TConfigurationContorllerType : ConfigurationController<TConfigurationType>, new()
public abstract class BaseKernel<TConfigurationType>
where TConfigurationType : BaseConfiguration, new()
{
/// <summary>
@@ -21,19 +25,39 @@ namespace MediaBrowser.Common.Kernel
/// </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 TConfigurationContorllerType ConfigurationController { get; private set; }
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; }
public PluginController PluginController { get; private set; }
/// <summary>
/// Gets the kernel context. The UI kernel will have to override this.
/// </summary>
@@ -43,9 +67,6 @@ namespace MediaBrowser.Common.Kernel
{
ProgramDataPath = GetProgramDataPath();
PluginController = new PluginController() { PluginsPath = Path.Combine(ProgramDataPath, "Plugins") };
ConfigurationController = new TConfigurationContorllerType() { Path = Path.Combine(ProgramDataPath, "config.js") };
Logger.LoggerInstance = new FileLogger(Path.Combine(ProgramDataPath, "Logs"));
}
@@ -55,7 +76,51 @@ namespace MediaBrowser.Common.Kernel
ReloadHttpServer();
ReloadPlugins();
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>
@@ -87,9 +152,21 @@ namespace MediaBrowser.Common.Kernel
private void ReloadConfiguration()
{
// Deserialize config
ConfigurationController.Reload();
if (!File.Exists(ConfigurationPath))
{
Configuration = new TConfigurationType();
}
else
{
Configuration = JsonSerializer.DeserializeFromFile<TConfigurationType>(ConfigurationPath);
}
Logger.LoggerInstance.LogSeverity = ConfigurationController.Configuration.LogSeverity;
Logger.LoggerInstance.LogSeverity = Configuration.LogSeverity;
}
public void SaveConfiguration()
{
JsonSerializer.SerializeToFile(Configuration, ConfigurationPath);
}
private void ReloadHttpServer()
@@ -99,13 +176,7 @@ namespace MediaBrowser.Common.Kernel
HttpServer.Dispose();
}
HttpServer = new HttpServer("http://+:" + ConfigurationController.Configuration.HttpServerPortNumber + "/mediabrowser/");
}
protected virtual void ReloadPlugins()
{
// Find plugins
PluginController.Init(KernelContext);
HttpServer = new HttpServer("http://+:" + Configuration.HttpServerPortNumber + "/mediabrowser/");
}
private static TConfigurationType GetConfiguration(string directory)

3
MediaBrowser.Common/MediaBrowser.Common.csproj
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@@ -34,6 +34,7 @@
<HintPath>..\packages\ServiceStack.Text.3.8.5\lib\net35\ServiceStack.Text.dll</HintPath>
</Reference>
<Reference Include="System" />
<Reference Include="System.ComponentModel.Composition" />
<Reference Include="System.Configuration" />
<Reference Include="System.Core" />
<Reference Include="System.Reactive, Version=1.0.10621.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
@@ -48,7 +49,6 @@
</ItemGroup>
<ItemGroup>
<Compile Include="Configuration\BaseConfiguration.cs" />
<Compile Include="Configuration\ConfigurationController.cs" />
<Compile Include="Events\GenericItemEventArgs.cs" />
<Compile Include="Json\JsonSerializer.cs" />
<Compile Include="Kernel\BaseKernel.cs" />
@@ -67,7 +67,6 @@
<Compile Include="Logging\Logger.cs" />
<Compile Include="Logging\LogRow.cs" />
<Compile Include="Plugins\BasePlugin.cs" />
<Compile Include="Plugins\PluginController.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>

18
MediaBrowser.Common/Plugins/BasePlugin.cs
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@@ -43,8 +43,22 @@ namespace MediaBrowser.Common.Plugins
public abstract class BasePlugin
{
public abstract string Name { get; }
public string Path { get; set; }
public Version Version { get; set; }
public string Path
{
get
{
return System.IO.Path.GetDirectoryName(GetType().Assembly.Location);
}
}
public Version Version
{
get
{
return GetType().Assembly.GetName().Version;
}
}
public BasePluginConfiguration Configuration { get; protected set; }

130
MediaBrowser.Common/Plugins/PluginController.cs
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@@ -1,130 +0,0 @@
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<BasePlugin> 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 =>
{
var plugin = Plugins.ElementAt(i);
plugin.ReloadConfiguration();
if (plugin.Enabled)
{
if (context == KernelContext.Server)
{
plugin.InitInServer();
}
else
{
plugin.InitInUI();
}
}
});
}
/// <summary>
/// Gets all plugins within PluginsPath
/// </summary>
/// <returns></returns>
private IEnumerable<BasePlugin> GetAllPlugins()
{
if (!Directory.Exists(PluginsPath))
{
Directory.CreateDirectory(PluginsPath);
}
List<BasePlugin> plugins = new List<BasePlugin>();
foreach (string folder in Directory.GetDirectories(PluginsPath, "*", SearchOption.TopDirectoryOnly))
{
BasePlugin plugin = GetPluginFromDirectory(folder);
plugin.Path = folder;
if (plugin != null)
{
plugins.Add(plugin);
}
}
return plugins;
}
private BasePlugin GetPluginFromDirectory(string path)
{
string dll = Directory.GetFiles(path, "*.dll", SearchOption.TopDirectoryOnly).FirstOrDefault();
if (!string.IsNullOrEmpty(dll))
{
return GetPluginFromDll(dll);
}
return null;
}
private BasePlugin GetPluginFromDll(string path)
{
return GetPluginFromDll(Assembly.Load(File.ReadAllBytes(path)));
}
private BasePlugin GetPluginFromDll(Assembly assembly)
{
var plugin = assembly.GetTypes().Where(type => typeof(BasePlugin).IsAssignableFrom(type)).FirstOrDefault();
if (plugin != null)
{
BasePlugin instance = plugin.GetConstructor(Type.EmptyTypes).Invoke(null) as BasePlugin;
instance.Version = assembly.GetName().Version;
return instance;
}
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;
}
}
}