[WIP-FEATURE] MSBuild server node

src/Build.UnitTests/BackEnd/RedirectConsoleWriter_Tests.cs

@@ -0,0 +1,29 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+//
+
+using System;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Build.Execution;
+using Xunit;
+
+namespace Microsoft.Build.Engine.UnitTests.BackEnd
+{
+    public class RedirectConsoleWriter_Tests
+    {
+        [Fact]
+        public async Task EmitConsoleMessages()
+        {
+            StringBuilder sb = new StringBuilder();
+            var writer = OutOfProcServerNode.RedirectConsoleWriter.Create(text => sb.Append(text));
+
+            writer.WriteLine("Line 1");
+            await Task.Delay(300);
+            writer.Write("Line 2");
+            writer.Dispose();
+
+            Assert.Equal($"Line 1{Environment.NewLine}Line 2", sb.ToString());
+        }
+    }
+}

src/Build/BackEnd/Components/Communications/NodeEndpointOutOfProc.cs

@@ -52,7 +52,7 @@ internal NodeEndpointOutOfProc(
         /// <summary>
         /// Returns the host handshake for this node endpoint
         /// </summary>
-        protected override Handshake GetHandshake()
+        protected override IHandshake GetHandshake()
         {
             return new Handshake(CommunicationsUtilities.GetHandshakeOptions(taskHost: false, is64Bit: EnvironmentUtilities.Is64BitProcess, nodeReuse: _enableReuse, lowPriority: _lowPriority));
         }

src/Build/BackEnd/Components/Communications/ServerNodeEndpointOutOfProc.cs

@@ -0,0 +1,38 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+//
+
+using Microsoft.Build.Internal;
+
+namespace Microsoft.Build.BackEnd
+{
+    /// <summary>
+    /// This is an implementation of INodeEndpoint for the out-of-proc nodes.  It acts only as a client.
+    /// </summary>
+    internal sealed class ServerNodeEndpointOutOfProc : NodeEndpointOutOfProcBase
+    {
+        private readonly IHandshake _handshake;
+
+        /// <summary>
+        /// Instantiates an endpoint to act as a client
+        /// </summary>
+        /// <param name="pipeName">The name of the pipe to which we should connect.</param>
+        /// <param name="handshake"></param>
+        internal ServerNodeEndpointOutOfProc(
+            string pipeName,
+            IHandshake handshake)
+        {
+            _handshake = handshake;
+
+            InternalConstruct(pipeName);
+        }
+
+        /// <summary>
+        /// Returns the host handshake for this node endpoint
+        /// </summary>
+        protected override IHandshake GetHandshake()
+        {
+            return _handshake;
+        }
+    }
+}

src/Build/BackEnd/Node/ConsoleOutput.cs

@@ -0,0 +1,12 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+//
+
+namespace Microsoft.Build.BackEnd
+{
+    internal enum ConsoleOutput
+    {
+        Standard = 1,
+        Error
+    }
+}