Rewrite direct SessionStateProxy calls

All interactions with the runspace must be done through
PowerShellContext now that nested PowerShell instances are
encountered frequently.

Also fix a bunch of race conditions that were made more obvious
with the changes.

Author: SeeminglyScience

PowerShellEditorServices.build.ps1

@@ -189,10 +189,18 @@ task LayoutModule -After Build {
     New-Item -Force $PSScriptRoot\module\PowerShellEditorServices\bin\Core -Type Directory | Out-Null
 
     Copy-Item -Force -Path $PSScriptRoot\src\PowerShellEditorServices.Host\bin\$Configuration\netstandard1.6\* -Filter Microsoft.PowerShell.EditorServices*.dll -Destination $PSScriptRoot\module\PowerShellEditorServices\bin\Core\
+    if ($Configuration -eq 'Debug') {
+        Copy-Item -Force -Path $PSScriptRoot\src\PowerShellEditorServices.Host\bin\$Configuration\netstandard1.6\* -Filter Microsoft.PowerShell.EditorServices*.pdb -Destination $PSScriptRoot\module\PowerShellEditorServices\bin\Core\
+    }
+
     Copy-Item -Force -Path $PSScriptRoot\src\PowerShellEditorServices.Host\bin\$Configuration\netstandard1.6\UnixConsoleEcho.dll -Destination $PSScriptRoot\module\PowerShellEditorServices\bin\Core\
     Copy-Item -Force -Path $PSScriptRoot\src\PowerShellEditorServices.Host\bin\$Configuration\netstandard1.6\libdisablekeyecho.* -Destination $PSScriptRoot\module\PowerShellEditorServices\bin\Core\
     if (!$script:IsUnix) {
         Copy-Item -Force -Path $PSScriptRoot\src\PowerShellEditorServices.Host\bin\$Configuration\net451\* -Filter Microsoft.PowerShell.EditorServices*.dll -Destination $PSScriptRoot\module\PowerShellEditorServices\bin\Desktop\
+        if ($Configuration -eq 'Debug') {
+            Copy-Item -Force -Path $PSScriptRoot\src\PowerShellEditorServices.Host\bin\$Configuration\net451\* -Filter Microsoft.PowerShell.EditorServices*.pdb -Destination $PSScriptRoot\module\PowerShellEditorServices\bin\Desktop\
+        }
+
         Copy-Item -Force -Path $PSScriptRoot\src\PowerShellEditorServices.Host\bin\$Configuration\net451\Newtonsoft.Json.dll -Destination $PSScriptRoot\module\PowerShellEditorServices\bin\Desktop\
         Copy-Item -Force -Path $PSScriptRoot\src\PowerShellEditorServices.Host\bin\$Configuration\net451\UnixConsoleEcho.dll -Destination $PSScriptRoot\module\PowerShellEditorServices\bin\Desktop\
     }

module/Start-EditorServices.ps1

@@ -47,6 +47,9 @@ param(
     [ValidateSet("Normal", "Verbose", "Error","Diagnostic")]
     $LogLevel,
 
+    [string[]]
+    $FeatureFlags = @(),
+
     [switch]
     $WaitForDebugger,
 
@@ -163,7 +166,8 @@ $editorServicesHost =
         -LanguageServicePort $languageServicePort `
         -DebugServicePort $debugServicePort `
         -BundledModulesPath $BundledModulesPath `
-        -WaitForDebugger:$WaitForDebugger.IsPresent
+        -WaitForDebugger:$WaitForDebugger.IsPresent `
+        -FeatureFlags $FeatureFlags
 
 # TODO: Verify that the service is started
 

src/PowerShellEditorServices.Protocol/Server/DebugAdapter.cs

@@ -55,7 +55,7 @@ public DebugAdapter(
         }
 
         /// <summary>
-        /// Gets a boolean that indicates whether the current debug adapter is 
+        /// Gets a boolean that indicates whether the current debug adapter is
         /// using a temporary integrated console.
         /// </summary>
         public bool IsUsingTempIntegratedConsole { get; private set; }
@@ -118,6 +118,17 @@ protected Task LaunchScript(RequestContext<object> requestContext)
 
         private async Task OnExecutionCompleted(Task executeTask)
         {
+            try
+            {
+                await executeTask;
+            }
+            catch (Exception e)
+            {
+                Logger.Write(
+                    LogLevel.Error,
+                    "Exception occurred while awaiting debug launch task.\n\n" + e.ToString());
+            }
+
             Logger.Write(LogLevel.Verbose, "Execution completed, terminating...");
 
             this.executionCompleted = true;
@@ -471,7 +482,7 @@ protected async Task HandleDisconnectRequest(
                 if (this.executionCompleted == false)
                 {
                     this.disconnectRequestContext = requestContext;
-                    this.editorSession.PowerShellContext.AbortExecution();
+                    this.editorSession.PowerShellContext.AbortExecution(shouldAbortDebugSession: true);
 
                     if (this.isInteractiveDebugSession)
                     {
@@ -506,7 +517,7 @@ protected async Task HandleSetBreakpointsRequest(
                 }
             }
             catch (Exception e) when (
-                e is FileNotFoundException || 
+                e is FileNotFoundException ||
                 e is DirectoryNotFoundException ||
                 e is IOException ||
                 e is NotSupportedException ||
@@ -653,7 +664,7 @@ protected async Task HandleSetExceptionBreakpointsRequest(
             RequestContext<object> requestContext)
         {
             // TODO: When support for exception breakpoints (unhandled and/or first chance)
-            //       are added to the PowerShell engine, wire up the VSCode exception 
+            //       are added to the PowerShell engine, wire up the VSCode exception
             //       breakpoints here using the pattern below to prevent bug regressions.
             //if (!this.noDebug)
             //{
@@ -756,6 +767,20 @@ protected async Task HandleStackTraceRequest(
             StackFrameDetails[] stackFrames =
                 editorSession.DebugService.GetStackFrames();
 
+            // Handle a rare race condition where the adapter requests stack frames before they've
+            // begun building.
+            if (stackFrames == null)
+            {
+                await requestContext.SendResult(
+                    new StackTraceResponseBody
+                    {
+                        StackFrames = new StackFrame[0],
+                        TotalFrames = 0
+                    });
+
+                return;
+            }
+
             List<StackFrame> newStackFrames = new List<StackFrame>();
 
             int startFrameIndex = stackTraceParams.StartFrame ?? 0;
@@ -779,8 +804,7 @@ protected async Task HandleStackTraceRequest(
                         i));
             }
 
-            await requestContext.SendResult(
-                new StackTraceResponseBody
+            await requestContext.SendResult( new StackTraceResponseBody
                 {
                     StackFrames = newStackFrames.ToArray(),
                     TotalFrames = newStackFrames.Count

src/PowerShellEditorServices.Protocol/Server/LanguageServer.cs

@@ -1463,6 +1463,15 @@ private static async Task DelayThenInvokeDiagnostics(
             catch (TaskCanceledException)
             {
                 // If the task is cancelled, exit directly
+                foreach (var script in filesToAnalyze)
+                {
+                    await PublishScriptDiagnostics(
+                        script,
+                        script.SyntaxMarkers,
+                        correctionIndex,
+                        eventSender);
+                }
+
                 return;
             }