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test/PowerShellEditorServices.Test.E2E/Hosts/DebugOutputStream.cs

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+#nullable enable
+
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using Nerdbank.Streams;
+
+namespace PowerShellEditorServices.Test.E2E;
+
+/// <summary>
+/// A stream that logs all data read and written to the debug stream which is visible in the debug console when a
+/// debugger is attached.
+/// </summary>
+internal class DebugOutputStream : MonitoringStream
+{
+    public DebugOutputStream(Stream? underlyingStream)
+    : base(underlyingStream ?? new MemoryStream())
+    {
+        DidRead += (_, segment) =>
+        {
+            if (segment.Array is null) { return; }
+            LogData("⬅️", segment.Array, segment.Offset, segment.Count);
+        };
+
+        DidWrite += (_, segment) =>
+        {
+            if (segment.Array is null) { return; }
+            LogData("➡️", segment.Array, segment.Offset, segment.Count);
+        };
+    }
+
+    private static void LogData(string header, byte[] buffer, int offset, int count)
+    {
+        // If debugging, the raw traffic will be visible in the debug console
+        if (Debugger.IsAttached)
+        {
+            string data = Encoding.UTF8.GetString(buffer, offset, count);
+            Debug.WriteLine($"{header} {data}");
+        }
+    }
+}