Easily install missing IronPython extension package

src/DynamoCore/Graph/Workspaces/PackageDependencyInfo.cs

@@ -252,27 +252,6 @@ public void AddDependent(Guid guid)
             Nodes.Add(guid);
         }
 
-        /// <summary>
-        /// Add the Guids of a dependent nodes
-        /// </summary>
-        /// <param name="guids"></param>
-        internal void AddDependents(IEnumerable<Guid> guids)
-        {
-            foreach (var guid in guids)
-            {
-                Nodes.Add(guid);
-            }
-        }
-
-        /// <summary>
-        /// Remove a dependent node
-        /// </summary>
-        /// <param name="guid"></param>
-        internal void RemoveDependent(Guid guid)
-        {
-            Nodes.Remove(guid);
-        }
-
         /// <summary>
         /// Checks whether two PackageDependencyInfo instances are equal
         /// They are equal if their Name and Versions are equal

src/DynamoCore/Graph/Workspaces/WorkspaceModel.cs

@@ -541,6 +541,23 @@ public HashSet<Guid> Dependencies
             }
         }
 
+        /// <summary>
+        /// Event requesting subscribers to return additional package dependencies for
+        /// current workspace.
+        /// </summary>
+        internal event Func<IEnumerable<INodeLibraryDependencyInfo>> RequestPackageDependencies;
+
+        /// <summary>
+        /// Raised when the workspace needs to request for additional package dependencies
+        /// that can be returned from other subscribers such as view extensions.
+        /// E.g. The PythonMigrationViewExtension returns additional package dependencies required for Python engines.
+        /// </summary>
+        /// <returns></returns>
+        internal IEnumerable<INodeLibraryDependencyInfo> OnRequestPackageDependencies()
+        {
+            return RequestPackageDependencies?.Invoke();
+        }
+
         /// <summary>
         /// NodeLibraries that the nodes in this graph depend on
         /// </summary>

src/DynamoCore/Models/DynamoModel.cs

@@ -366,7 +366,7 @@ public WorkspaceModel CurrentWorkspace
                 var old = currentWorkspace;
                 currentWorkspace = value;
                 OnWorkspaceHidden(old);
-                OnPropertyChanged("CurrentWorkspace");
+                OnPropertyChanged(nameof(CurrentWorkspace));
             }
         }
 

src/PythonMigrationViewExtension/GraphPythonDependencies.cs

@@ -12,6 +12,9 @@ namespace Dynamo.PythonMigration
     public class GraphPythonDependencies
     {
         private ViewLoadedParams ViewLoaded { get; set; }
+        internal static readonly string PythonPackage = "DSIronPython_Test";
+        internal static readonly Version PythonPackageVersion = new Version(1, 0, 7);
+
 
         // A dictionary to mark Custom Nodes if they have a IronPython dependency or not. 
         internal static Dictionary<Guid, CNPythonDependencyType> CustomNodePythonDependencyMap = new Dictionary<Guid, CNPythonDependencyType>();
@@ -28,21 +31,39 @@ internal GraphPythonDependencies(ViewLoadedParams viewLoadedParams)
             this.ViewLoaded = viewLoadedParams;
         }
 
+        private static bool IsIronPythonPackageLoaded()
+        {
+            try
+            {
+                PythonEngineSelector.Instance.GetEvaluatorInfo(PythonEngineVersion.IronPython2,
+                    out string evaluatorClass, out string evaluationMethod);
+                if (evaluatorClass == PythonEngineSelector.Instance.IronPythonEvaluatorClass &&
+                    evaluationMethod == PythonEngineSelector.Instance.IronPythonEvaluationMethod)
+                {
+                    return true;
+                }
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+            return false;
+        }
+
         internal bool ContainsIronPythonDependencyInCurrentWS()
         {
             var containsIronPythonDependency = false;
-            var workspace = ViewLoaded.CurrentWorkspaceModel;
 
-            if (workspace == null)
-                throw new ArgumentNullException(nameof(workspace));
+            var workspace = ViewLoaded.CurrentWorkspaceModel as WorkspaceModel;
+
+            var customNodeManager = ViewLoaded.StartupParams.CustomNodeManager;
 
-            if (workspace.Nodes.Any(n => IsIronPythonNode(n)))
+            if (workspace.Nodes.Any(IsIronPythonNode))
             {
                 containsIronPythonDependency = true;
             }
 
             // Check if any of the custom nodes has IronPython dependencies in it. 
-            var customNodeManager = ViewLoaded.StartupParams.CustomNodeManager;
             var customNodes = workspace.Nodes.OfType<Function>();
 
             if (CustomNodesContainIronPythonDependency(customNodes, customNodeManager))
@@ -53,16 +74,32 @@ internal bool ContainsIronPythonDependencyInCurrentWS()
             return containsIronPythonDependency;
         }
 
+        internal IEnumerable<INodeLibraryDependencyInfo> AddPythonPackageDependency()
+        {
+            if (!ContainsIronPythonDependencyInCurrentWS())
+                return null;
+
+            var packageInfo = new PackageInfo(PythonPackage, PythonPackageVersion);
+            var packageDependencyInfo = new PackageDependencyInfo(packageInfo);
+            packageDependencyInfo.State = IsIronPythonPackageLoaded()
+                ? PackageDependencyState.Loaded
+                : PackageDependencyState.Missing;
+
+            return new[] {packageDependencyInfo};
+        }
+
         // This function returns true, if any of the custom nodes in the input list has an IronPython dependency. 
         // It traverses all CN's in the given list of customNodes and marks them as true in CustomNodePythonDependency, 
         // if the prarent custom node or any of its child custom nodes contain an IronPython dependency.
-        internal static bool CustomNodesContainIronPythonDependency(IEnumerable<Function> customNodes, ICustomNodeManager customNodeManager)
+        private static bool CustomNodesContainIronPythonDependency(IEnumerable<Function> customNodes, ICustomNodeManager customNodeManager)
         {
             var containIronPythonDependency = false;
 
             foreach (var customNode in customNodes)
             {
-                customNodeManager.TryGetFunctionWorkspace(customNode.FunctionSignature, false, out ICustomNodeWorkspaceModel customNodeWS);
+                if (!customNodeManager.TryGetFunctionWorkspace(customNode.FunctionSignature, false,
+                    out ICustomNodeWorkspaceModel customNodeWS))
+                    continue;
 
                 // If a custom node workspace is already checked for IronPython dependencies, 
                 // check the CustomNodePythonDependency dictionary instead of processing it again. 

src/PythonMigrationViewExtension/PythonMigrationViewExtension.cs

@@ -63,6 +63,7 @@ public void Loaded(ViewLoadedParams p)
             DynamoViewModel = LoadedParams.DynamoWindow.DataContext as DynamoViewModel;
             CurrentWorkspace = LoadedParams.CurrentWorkspaceModel as WorkspaceModel;
             CustomNodeManager = (CustomNodeManager) LoadedParams.StartupParams.CustomNodeManager;
+            CurrentWorkspace.RequestPackageDependencies += PythonDependencies.AddPythonPackageDependency;
             Dispatcher = Dispatcher.CurrentDispatcher;
             DynamoView = LoadedParams.DynamoWindow as DynamoView;
 
@@ -119,6 +120,7 @@ private void UnsubscribeFromDynamoEvents()
             LoadedParams.CurrentWorkspaceChanged -= OnCurrentWorkspaceChanged;
             DynamoViewModel.CurrentSpaceViewModel.Model.NodeAdded -= OnNodeAdded;
             DynamoViewModel.Model.Logger.NotificationLogged -= OnNotificationLogged;
+            CurrentWorkspace.RequestPackageDependencies -= PythonDependencies.AddPythonPackageDependency;
         }
 
         private void OnNotificationLogged(NotificationMessage obj)
@@ -160,8 +162,13 @@ private void OnCurrentWorkspaceChanged(IWorkspaceModel workspace)
             {
                 NotificationTracker.Remove(CurrentWorkspace.Guid);
                 GraphPythonDependencies.CustomNodePythonDependencyMap.Clear();
+
+                CurrentWorkspace.RequestPackageDependencies -= PythonDependencies.AddPythonPackageDependency;
+
                 CurrentWorkspace = workspace as WorkspaceModel;
 
+                CurrentWorkspace.RequestPackageDependencies += PythonDependencies.AddPythonPackageDependency;
+
                 if (Configuration.DebugModes.IsEnabled("Python2ObsoleteMode")
                     && !Models.DynamoModel.IsTestMode
                     && PythonDependencies.ContainsIronPythonDependencyInCurrentWS())

src/WorkspaceDependencyViewExtension/WorkspaceDependencyView.xaml.cs

@@ -123,8 +123,12 @@ private void OnWorkspacePropertyChanged(object sender, PropertyChangedEventArgs
         /// <param name="ws">workspace model</param>
         internal void DependencyRegen(WorkspaceModel ws)
         {
-            this.RestartBanner.Visibility = Visibility.Hidden;
-            var packageDependencies = ws.NodeLibraryDependencies.Where(d => d is PackageDependencyInfo);
+            RestartBanner.Visibility = Visibility.Hidden;
+            var packageDependencies = ws.NodeLibraryDependencies.Where(d => d is PackageDependencyInfo).ToList();
+
+            var pythonPackageDependencies = ws.OnRequestPackageDependencies();
+            if (pythonPackageDependencies != null)
+                packageDependencies.AddRange(pythonPackageDependencies);
 
             if (packageDependencies.Any(d => d.State != PackageDependencyState.Loaded))
             {
@@ -137,7 +141,8 @@ internal void DependencyRegen(WorkspaceModel ws)
                 // If package is set to uninstall state, update the package info
                 foreach (var package in dependencyViewExtension.pmExtension.PackageLoader.LocalPackages.Where(x => x.MarkedForUninstall))
                 {
-                    (packageDependencies.Where(x => x.Name == package.Name).FirstOrDefault() as PackageDependencyInfo).State = PackageDependencyState.RequiresRestart;
+                    (packageDependencies.FirstOrDefault(x => x.Name == package.Name) as PackageDependencyInfo).State = 
+                        PackageDependencyState.RequiresRestart;
                     hasPackageMarkedForUninstall = true;
                 }
                 this.RestartBanner.Visibility = hasPackageMarkedForUninstall ? Visibility.Visible: Visibility.Hidden;

test/DynamoCoreWpfTests/DynamoTestUIBase.cs

@@ -4,6 +4,7 @@
 using System.Linq;
 using System.Reflection;
 using System.Threading;
+using System.Windows;
 using Dynamo.Configuration;
 using Dynamo.Controls;
 using Dynamo.Graph.Nodes;
@@ -78,6 +79,16 @@ public virtual void Start()
             SynchronizationContext.SetSynchronizationContext(new SynchronizationContext());
         }
 
+        protected static void RaiseLoadedEvent(FrameworkElement element)
+        {
+            MethodInfo eventMethod = typeof(FrameworkElement).GetMethod("OnLoaded",
+                BindingFlags.Instance | BindingFlags.NonPublic);
+
+            RoutedEventArgs args = new RoutedEventArgs(FrameworkElement.LoadedEvent);
+
+            eventMethod.Invoke(element, new object[] { args });
+        }
+
         /// <summary>
         /// Derived test classes can override this method to provide different configurations.
         /// </summary>

test/DynamoCoreWpfTests/ViewExtensions/PythonMigrationViewExtensionTests.cs

@@ -7,22 +7,24 @@
 using Dynamo;
 using Dynamo.Configuration;
 using Dynamo.Graph.Nodes.CustomNodes;
+using Dynamo.Graph.Workspaces;
 using Dynamo.Models;
 using Dynamo.PythonMigration;
 using Dynamo.Utilities;
+using Dynamo.Wpf.Extensions;
 using DynamoCoreWpfTests.Utility;
+using GraphLayout;
 using NUnit.Framework;
 
 namespace DynamoCoreWpfTests
 {
     class PythonMigrationViewExtensionTests : DynamoTestUIBase
     {
         private PythonMigrationViewExtension viewExtension = new PythonMigrationViewExtension();
-
+        private string CoreTestDirectory { get { return Path.Combine(GetTestDirectory(ExecutingDirectory), "core"); } }
 
         private List<string> raisedEvents = new List<string>();
 
-
         /// <summary>
         /// This test is created to check if the extension displays a dialog to the user
         /// when opening a saved dyn file that contains python nodes with their engine set to `IronPython2`
@@ -231,7 +233,7 @@ public void CanDetectIronPythonNodesInGraph()
 
         /// <summary>
         /// Checks if pressing the `More Information` button on the IronPythonInfoDialog window
-        /// will open the DocumentaionBrowser ViewExtension.
+        /// will open the DocumentationBrowser ViewExtension.
         /// </summary>
         [Test]
         public void CanOpenDocumentationBrowserWhenMoreInformationIsClicked()
@@ -293,13 +295,36 @@ public void CustomNodeContainsIronPythonDependencyTest()
             var examplePath = Path.Combine(UnitTestBase.TestDirectory, @"core\python", "PythonCustomNodeHomeWorkspace.dyn");
             Open(examplePath);
 
-            var customNodes = ViewModel.Model.CurrentWorkspace.Nodes.OfType<Function>();
-            var customNodeManager = ViewModel.Model.CustomNodeManager;
+            var pythonMigration = View.viewExtensionManager.ViewExtensions
+                .Where(x => x.Name == viewExtension.Name)
+                .Select(x => x)
+                .First() as PythonMigrationViewExtension;
 
-            var result = GraphPythonDependencies.CustomNodesContainIronPythonDependency(customNodes, customNodeManager);
+            var result = pythonMigration.PythonDependencies.ContainsIronPythonDependencyInCurrentWS();
 
             Assert.IsTrue(result);
             DispatcherUtil.DoEvents();
         }
+
+        [Test]
+        public void IronPythonPackageLoadedTest()
+        {
+            RaiseLoadedEvent(View);
+
+            Open(Path.Combine(CoreTestDirectory, @"python\python.dyn"));
+
+            var loadedParams = new ViewLoadedParams(View, ViewModel);
+            viewExtension.Loaded(loadedParams);
+
+            var currentWorkspace = ViewModel.Model.CurrentWorkspace;
+
+            var pkgDependencyInfo = currentWorkspace.OnRequestPackageDependencies().FirstOrDefault();
+
+            Assert.IsTrue(pkgDependencyInfo != null);
+            Assert.AreEqual(PackageDependencyState.Loaded, pkgDependencyInfo.State);
+            Assert.AreEqual(GraphPythonDependencies.PythonPackage, pkgDependencyInfo.Name);
+            Assert.AreEqual(GraphPythonDependencies.PythonPackageVersion, pkgDependencyInfo.Version);
+        }
+
     }
 }

test/DynamoCoreWpfTests/ViewExtensions/WorkspaceDependencyViewExtensionTests.cs

@@ -48,7 +48,8 @@ public void RestartBannerDefaultStateTest()
 
             var loadedParams = new ViewLoadedParams(View, ViewModel);
             viewExtension.pmExtension = this.Model.ExtensionManager.Extensions.OfType<PackageManagerExtension>().FirstOrDefault();
-            viewExtension.DependencyView = new WorkspaceDependencyView(viewExtension, loadedParams);
+            viewExtension.Loaded(loadedParams);
+
             var CurrentWorkspace = ViewModel.Model.CurrentWorkspace;
             viewExtension.DependencyView.DependencyRegen(CurrentWorkspace);
             // Restart banner should not display by default
@@ -67,10 +68,9 @@ public void DownloadSpecifiedVersionOfPackageTest()
 
             var loadedParams = new ViewLoadedParams(View, ViewModel);
             viewExtension.pmExtension = this.Model.ExtensionManager.Extensions.OfType<PackageManagerExtension>().FirstOrDefault();
-            viewExtension.DependencyView = new WorkspaceDependencyView(viewExtension, loadedParams);
+            viewExtension.Loaded(loadedParams);
 
             var CurrentWorkspace = ViewModel.Model.CurrentWorkspace;
-            var info = CurrentWorkspace.NodeLibraryDependencies.Find(x => x.Name == "Dynamo Samples");
 
             // This is equivalent to uninstall the package
             var package = viewExtension.pmExtension.PackageLoader.LocalPackages.Where(x => x.Name == "Dynamo Samples").FirstOrDefault();
@@ -160,7 +160,7 @@ public void DependencyRegenCrashingDynamoTest()
 
             var loadedParams = new ViewLoadedParams(View, ViewModel);
             viewExtension.pmExtension = this.Model.ExtensionManager.Extensions.OfType<PackageManagerExtension>().FirstOrDefault();
-            viewExtension.DependencyView = new WorkspaceDependencyView(viewExtension, loadedParams);
+            viewExtension.Loaded(loadedParams);
 
             var homeWorkspaceModel = ViewModel.Model.Workspaces.OfType<HomeWorkspaceModel>().FirstOrDefault();
 
@@ -185,7 +185,7 @@ public void KeepInstalledVersionOfPackageTest()
 
             var loadedParams = new ViewLoadedParams(View, ViewModel);
             viewExtension.pmExtension = this.Model.ExtensionManager.Extensions.OfType<PackageManagerExtension>().FirstOrDefault();
-            viewExtension.DependencyView = new WorkspaceDependencyView(viewExtension, loadedParams);
+            viewExtension.Loaded(loadedParams);
 
             var CurrentWorkspace = ViewModel.Model.CurrentWorkspace;
             var info = CurrentWorkspace.NodeLibraryDependencies.Find(x => x.Name == "Dynamo Samples");
@@ -239,14 +239,6 @@ public void TestPropertiesWithCodeInIt()
 
         }
 
-        public static void RaiseLoadedEvent(FrameworkElement element)
-        {
-            MethodInfo eventMethod = typeof(FrameworkElement).GetMethod("OnLoaded",
-                BindingFlags.Instance | BindingFlags.NonPublic);
-
-            RoutedEventArgs args = new RoutedEventArgs(FrameworkElement.LoadedEvent);
-
-            eventMethod.Invoke(element, new object[] { args });
-        }
+
     }
 }