private void Activate(PluginInstance instance)
{
Log.Debug(Tag, $"Attempting to load {instance.Name}");
if (IsAlreadyLoaded(instance.Assembly.GetName()))
{
return;
}
var types = instance.Assembly.GetExportedTypes();
// Only filter for types which can be instantiated and implement IPlugin somehow.
var implementingType = types.FirstOrDefault(
type =>
!type.IsInterface &&
!type.IsAbstract &&
type.GetInterface(nameof(IPlugin)) != null);
if (implementingType == null)
{
throw new PluginLoadException("No exported types found implementing IPlugin.",
instance.AssemblyDirectory);
}
// Activate base plugin
var plugin = (IPlugin)Activator.CreateInstance(implementingType);
if (plugin.ApiVersion != ApiVersion)
{
throw new PluginLoadException($"Plugin declares incompatible API version: expected {ApiVersion}, found {plugin.ApiVersion}.",
instance.AssemblyDirectory);
}
instance.Info = plugin.Info;
instance.Plugin = plugin;
var servicePlugin = plugin as MusicService;
var context = new PluginContext
{
PluginDirectory = instance.AssemblyDirectory
};
instance.Context = context;
if (servicePlugin != null)
{
var settingsPath = Program.DefaultApp.UserDataPathOf(Path.Combine(SettingsDir, String.Format(SettingsFileFormat, plugin.Info.Name)));
var settingsFile = new SettingsFile(settingsPath, servicePlugin.Settings.GetType(),
servicePlugin.Settings);
instance.SettingsFile = settingsFile;
}
else
{
throw new PluginLoadException("IPlugin type does not implement MusicService.", instance.AssemblyDirectory);
}
}
public void LoadAll()
{
BeforeLoad();
// Plugins are stored in format {PluginDir}/{PluginName}/AthamePlugin.*.dll
var subDirs = Directory.GetDirectories(PluginDirectory);
isLoading = true;
foreach (var dir in subDirs)
{
var name = Path.GetFileName(dir);
try
{
// Attempt to load a .pdb if one exists
var basePath = Path.Combine(dir, PluginDllPrefix + name);
var dllFilename = basePath + ".dll";
var pdbFilename = basePath + ".pdb";
var theAssembly = File.Exists(pdbFilename)
? Assembly.Load(File.ReadAllBytes(dllFilename), File.ReadAllBytes(pdbFilename))
: Assembly.Load(File.ReadAllBytes(dllFilename));
// Set basic information about the assembly
var plugin = new PluginInstance
{
Assembly = theAssembly,
AssemblyDirectory = dir,
Name = name
};
Plugins.Add(plugin);
Activate(plugin);
AreAnyLoaded = true;
}
catch (Exception ex)
{
Log.WriteException(Level.Error, Tag, ex, $"While loading plugin {name}");
var eventArgs = new PluginLoadExceptionEventArgs {
PluginName = name, Exception = ex, Continue = true
};
LoadException?.Invoke(this, eventArgs);
if (!eventArgs.Continue)
{
return;
}
}
}
isLoading = false;
}