Improve gRPC interop test failure logging (#22856)

src/Grpc/test/InteropTests/Helpers/ClientProcess.cs

@@ -44,6 +44,7 @@ namespace InteropTests.Helpers
         public Task WaitForReadyAsync() => _startTcs.Task;
         public Task WaitForExitAsync() => _processEx.Exited;
         public int ExitCode => _process.ExitCode;
+        public bool IsReady => _startTcs.Task.IsCompletedSuccessfully;
 
         public string GetOutput()
         {
@@ -77,7 +78,7 @@ namespace InteropTests.Helpers
             {
                 lock (_outputLock)
                 {
-                    _output.AppendLine(data);
+                    _output.AppendLine("ERROR: " + data);
                 }
             }
         }

src/Grpc/test/InteropTests/Helpers/WebsiteProcess.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Diagnostics;
+using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
@@ -17,11 +18,16 @@ namespace InteropTests.Helpers
         private readonly ProcessEx _processEx;
         private readonly TaskCompletionSource<object> _startTcs;
         private static readonly Regex NowListeningRegex = new Regex(@"^\s*Now listening on: .*:(?<port>\d*)$");
+        private readonly StringBuilder _output;
+        private readonly object _outputLock = new object();
 
         public string ServerPort { get; private set; }
+        public bool IsReady => _startTcs.Task.IsCompletedSuccessfully;
 
         public WebsiteProcess(string path, ITestOutputHelper output)
         {
+            _output = new StringBuilder();
+
             _process = new Process();
             _process.StartInfo = new ProcessStartInfo
             {
@@ -32,6 +38,7 @@ namespace InteropTests.Helpers
             };
             _process.EnableRaisingEvents = true;
             _process.OutputDataReceived += Process_OutputDataReceived;
+            _process.ErrorDataReceived += Process_ErrorDataReceived;
             _process.Start();
 
             _processEx = new ProcessEx(output, _process, Timeout.InfiniteTimeSpan);
@@ -39,6 +46,14 @@ namespace InteropTests.Helpers
             _startTcs = new TaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
         }
 
+        public string GetOutput()
+        {
+            lock (_outputLock)
+            {
+                return _output.ToString();
+            }
+        }
+
         public Task WaitForReady()
         {
             if (_processEx.HasExited)
@@ -64,6 +79,23 @@ namespace InteropTests.Helpers
                 {
                     _startTcs.TrySetResult(null);
                 }
+
+                lock (_outputLock)
+                {
+                    _output.AppendLine(data);
+                }
+            }
+        }
+
+        private void Process_ErrorDataReceived(object sender, DataReceivedEventArgs e)
+        {
+            var data = e.Data;
+            if (data != null)
+            {
+                lock (_outputLock)
+                {
+                    _output.AppendLine("ERROR: " + data);
+                }
             }
         }
 

src/Grpc/test/InteropTests/InteropTests.cs

@@ -103,10 +103,20 @@ namespace InteropTests
                     }
                     catch (Exception ex)
                     {
-                        var clientOutput = clientProcess.GetOutput();
-                        var errorMessage = $@"Error while running client process. Process output:
+                        var errorMessage = $@"Error while running client process.
+
+Server ready: {serverProcess.IsReady}
+Client ready: {clientProcess.IsReady}
+
+Server process output:
 ======================================
-{clientOutput}";
+{serverProcess.GetOutput()}
+======================================
+
+Client process output:
+======================================
+{clientProcess.GetOutput()}
+======================================";
                         throw new InvalidOperationException(errorMessage, ex);
                     }
                 }

src/Grpc/test/testassets/InteropWebsite/Program.cs

@@ -22,6 +22,7 @@ using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
 
 namespace InteropTestsWebsite
 {
@@ -34,6 +35,11 @@ namespace InteropTestsWebsite
 
         public static IHostBuilder CreateHostBuilder(string[] args) =>
             Host.CreateDefaultBuilder(args)
+                .ConfigureLogging(builder =>
+                {
+                    builder.AddConsole();
+                    builder.SetMinimumLevel(LogLevel.Trace);
+                })
                 .ConfigureWebHostDefaults(webBuilder =>
                 {
                     webBuilder.ConfigureKestrel((context, options) =>