private static LoadPluginResult LoadPluginFromFolder(string pluginFolderPath, ICollection<string> installedPluginSystemNames) { Guard.ArgumentNotEmpty(() => pluginFolderPath); var folder = new DirectoryInfo(pluginFolderPath); if (!folder.Exists) { return null; } var descriptionFile = new FileInfo(Path.Combine(pluginFolderPath, "Description.txt")); if (!descriptionFile.Exists) { return null; } // load descriptor file (Description.txt) var descriptor = PluginFileParser.ParsePluginDescriptionFile(descriptionFile.FullName); // some validation if (descriptor.SystemName.IsEmpty()) { throw new Exception("The plugin descriptor '{0}' does not define a plugin system name. Try assigning the plugin a unique name and recompile.".FormatInvariant(descriptionFile.FullName)); } if (descriptor.PluginFileName.IsEmpty()) { throw new Exception("The plugin descriptor '{0}' does not define a plugin assembly file name. Try assigning the plugin a file name and recompile.".FormatInvariant(descriptionFile.FullName)); } var result = new LoadPluginResult { DescriptionFile = descriptionFile, Descriptor = descriptor }; //ensure that version of plugin is valid if (!IsAssumedCompatible(descriptor)) { result.IsIncompatible = true; return result; } if (_referencedPlugins.ContainsKey(descriptor.SystemName)) { throw new Exception(string.Format("A plugin with system name '{0}' is already defined", descriptor.SystemName)); } if (installedPluginSystemNames == null) { installedPluginSystemNames = PluginFileParser.ParseInstalledPluginsFile(); } // set 'Installed' property descriptor.Installed = installedPluginSystemNames.Contains(descriptor.SystemName); try { // get list of all DLLs in plugin folders (not in 'bin' or '_Backup'!) var pluginBinaries = descriptionFile.Directory.GetFiles("*.dll", SearchOption.AllDirectories) // just make sure we're not registering shadow copied plugins .Where(x => IsPackagePluginFolder(x.Directory)) .ToList(); // other plugin description info var mainPluginFile = pluginBinaries.Where(x => x.Name.IsCaseInsensitiveEqual(descriptor.PluginFileName)).FirstOrDefault(); descriptor.OriginalAssemblyFile = mainPluginFile; // shadow copy main plugin file descriptor.ReferencedAssembly = Probe(mainPluginFile); if (!descriptor.Installed) { _inactiveAssemblies.Add(descriptor.ReferencedAssembly); } // load all other referenced assemblies now var otherAssemblies = from x in pluginBinaries where !x.Name.IsCaseInsensitiveEqual(mainPluginFile.Name) select x; foreach (var assemblyFile in otherAssemblies) { if (!IsAlreadyLoaded(assemblyFile)) { Probe(assemblyFile); } } // init plugin type (only one plugin per assembly is allowed) var exportedTypes = descriptor.ReferencedAssembly.ExportedTypes; bool pluginFound = false; bool preStarterFound = !descriptor.Installed; foreach (var t in exportedTypes) { if (typeof(IPlugin).IsAssignableFrom(t) && !t.IsInterface && t.IsClass && !t.IsAbstract) { descriptor.PluginType = t; descriptor.IsConfigurable = typeof(IConfigurable).IsAssignableFrom(t); pluginFound = true; } else if (descriptor.Installed && typeof(IPreApplicationStart).IsAssignableFrom(t) && !t.IsInterface && t.IsClass && !t.IsAbstract && t.HasDefaultConstructor()) { try { var preStarter = Activator.CreateInstance(t) as IPreApplicationStart; preStarter.Start(); } catch { } preStarterFound = true; } if (pluginFound && preStarterFound) { break; } } result.Success = true; } catch (ReflectionTypeLoadException ex) { var msg = string.Empty; foreach (var e in ex.LoaderExceptions) { msg += e.Message + Environment.NewLine; } var fail = new Exception(msg, ex); Debug.WriteLine(fail.Message, fail); throw fail; } return result; }
private static LoadPluginResult LoadPluginFromFolder(string pluginFolderPath, ICollection <string> installedPluginSystemNames) { Guard.ArgumentNotEmpty(() => pluginFolderPath); var folder = new DirectoryInfo(pluginFolderPath); if (!folder.Exists) { return(null); } var descriptionFile = new FileInfo(Path.Combine(pluginFolderPath, "Description.txt")); if (!descriptionFile.Exists) { return(null); } // load descriptor file (Description.txt) var descriptor = PluginFileParser.ParsePluginDescriptionFile(descriptionFile.FullName); // some validation if (descriptor.SystemName.IsEmpty()) { throw new Exception("The plugin descriptor '{0}' does not define a plugin system name. Try assigning the plugin a unique name and recompile.".FormatInvariant(descriptionFile.FullName)); } if (descriptor.PluginFileName.IsEmpty()) { throw new Exception("The plugin descriptor '{0}' does not define a plugin assembly file name. Try assigning the plugin a file name and recompile.".FormatInvariant(descriptionFile.FullName)); } var result = new LoadPluginResult { DescriptionFile = descriptionFile, Descriptor = descriptor }; //ensure that version of plugin is valid if (!IsAssumedCompatible(descriptor)) { result.IsIncompatible = true; return(result); } if (_referencedPlugins.ContainsKey(descriptor.SystemName)) { throw new Exception(string.Format("A plugin with system name '{0}' is already defined", descriptor.SystemName)); } if (installedPluginSystemNames == null) { installedPluginSystemNames = PluginFileParser.ParseInstalledPluginsFile(); } // set 'Installed' property descriptor.Installed = installedPluginSystemNames.Contains(descriptor.SystemName); try { // get list of all DLLs in plugin folders (not in 'bin' or '_Backup'!) var pluginBinaries = descriptionFile.Directory.GetFiles("*.dll", SearchOption.AllDirectories) // just make sure we're not registering shadow copied plugins .Where(x => IsPackagePluginFolder(x.Directory)) .ToList(); // other plugin description info var mainPluginFile = pluginBinaries.Where(x => x.Name.IsCaseInsensitiveEqual(descriptor.PluginFileName)).FirstOrDefault(); descriptor.OriginalAssemblyFile = mainPluginFile; // shadow copy main plugin file descriptor.ReferencedAssembly = Probe(mainPluginFile); if (!descriptor.Installed) { _inactiveAssemblies.Add(descriptor.ReferencedAssembly); } // load all other referenced assemblies now var otherAssemblies = from x in pluginBinaries where !x.Name.IsCaseInsensitiveEqual(mainPluginFile.Name) select x; foreach (var assemblyFile in otherAssemblies) { if (!IsAlreadyLoaded(assemblyFile)) { Probe(assemblyFile); } } // init plugin type (only one plugin per assembly is allowed) var exportedTypes = descriptor.ReferencedAssembly.ExportedTypes; bool pluginFound = false; bool preStarterFound = !descriptor.Installed; foreach (var t in exportedTypes) { if (typeof(IPlugin).IsAssignableFrom(t) && !t.IsInterface && t.IsClass && !t.IsAbstract) { descriptor.PluginType = t; descriptor.IsConfigurable = typeof(IConfigurable).IsAssignableFrom(t); pluginFound = true; } else if (descriptor.Installed && typeof(IPreApplicationStart).IsAssignableFrom(t) && !t.IsInterface && t.IsClass && !t.IsAbstract && t.HasDefaultConstructor()) { try { var preStarter = Activator.CreateInstance(t) as IPreApplicationStart; preStarter.Start(); } catch { } preStarterFound = true; } if (pluginFound && preStarterFound) { break; } } result.Success = true; } catch (ReflectionTypeLoadException ex) { var msg = string.Empty; foreach (var e in ex.LoaderExceptions) { msg += e.Message + Environment.NewLine; } var fail = new Exception(msg, ex); Debug.WriteLine(fail.Message, fail); throw fail; } return(result); }