Address unit test timing and setting Console.Out

src/WebJobs.Script.WebHost/Diagnostics/BufferedConsoleWriter.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
 using System;
+using System.IO;
 using System.Text;
 using System.Threading;
 using System.Threading.Channels;
@@ -50,6 +51,21 @@ internal BufferedConsoleWriter(int bufferSize, Action<Exception> exceptionHandle
             _exceptionhandler = exceptionHandler;
         }
 
+        public TextWriter Writer { get; init; } = Console.Out;
+
+        /// <summary>
+        /// Primarily for testing. Do not call in production.
+        /// </summary>
+        /// <remarks>
+        /// Not called 'FlushAsync' because this does stop processing messages.
+        /// </remarks>
+        /// <returns>A task that completes when all buffered messages are drained.</returns>
+        public Task CompleteAsync()
+        {
+            _consoleBuffer.Writer.TryComplete();
+            return _consoleBufferReadLoop;
+        }
+
         public void WriteHandler(string evt)
         {
             _writeEvent(evt);
@@ -65,7 +81,7 @@ private void WriteToConsoleBuffer(string evt)
                 // If the wait failed, write to the console. Otherwise, try the writing again - if that fails, write to the console.
                 if (waitFailed || !_consoleBuffer.Writer.TryWrite(evt))
                 {
-                    Console.WriteLine(evt);
+                    Writer.WriteLine(evt);
                 }
             }
         }
@@ -108,12 +124,12 @@ private async Task ProcessConsoleBufferAsync()
                             }
 
                             _writeResetEvent.Set();
-                            Console.Write(builder.ToString());
+                            Writer.Write(builder.ToString());
                             builder.Clear();
                         }
                         else
                         {
-                            Console.WriteLine(line1);
+                            Writer.WriteLine(line1);
                         }
                     }
                 }
@@ -126,7 +142,7 @@ private async Task ProcessConsoleBufferAsync()
             finally
             {
                 // if this has failed for any reason, fall everything back to console
-                _writeEvent = Console.WriteLine;
+                _writeEvent = Writer.WriteLine;
                 _consoleBuffer.Writer.TryComplete();
             }
         }

src/WebJobs.Script.WebHost/Diagnostics/LinuxContainerEventGenerator.cs

@@ -2,13 +2,14 @@
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
 using System;
+using System.Threading.Tasks;
 using Microsoft.Azure.WebJobs.Script.Config;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 
 namespace Microsoft.Azure.WebJobs.Script.WebHost.Diagnostics
 {
-    internal class LinuxContainerEventGenerator : LinuxEventGenerator, IDisposable
+    internal sealed class LinuxContainerEventGenerator : LinuxEventGenerator, IDisposable
     {
         private const int MaxDetailsLength = 10000;
         private static readonly Lazy<LinuxContainerEventGenerator> _Lazy = new Lazy<LinuxContainerEventGenerator>(() => new LinuxContainerEventGenerator(SystemEnvironment.Instance, Console.WriteLine));
@@ -29,11 +30,15 @@ public LinuxContainerEventGenerator(IEnvironment environment, IOptions<ConsoleLo
             }
             else if (!consoleLoggingOptions.Value.BufferEnabled)
             {
-                _writeEvent = Console.WriteLine;
+                _writeEvent = consoleLoggingOptions.Value.Writer.WriteLine;
             }
             else
             {
-                _consoleWriter = new BufferedConsoleWriter(consoleLoggingOptions.Value.BufferSize, LogUnhandledException);
+                _consoleWriter = new BufferedConsoleWriter(consoleLoggingOptions.Value.BufferSize, LogUnhandledException)
+                {
+                    Writer = consoleLoggingOptions.Value.Writer
+                };
+
                 _writeEvent = _consoleWriter.WriteHandler;
             }
 
@@ -172,22 +177,21 @@ public static void LogEvent(string message, Exception e = null, LogLevel logLeve
                 eventTimestamp: DateTime.UtcNow);
         }
 
-        protected virtual void Dispose(bool disposing)
+        /// <summary>
+        /// Primarily for testing. Do not call in production.
+        /// </summary>
+        /// <remarks>
+        /// Not called 'FlushAsync' because this does stop processing messages.
+        /// </remarks>
+        /// <returns>A task that completes when all buffered messages are drained.</returns>
+        public Task CompleteAsync()
         {
-            if (!_disposed)
-            {
-                if (disposing)
-                {
-                    _consoleWriter?.Dispose();
-                }
-                _disposed = true;
-            }
+            return _consoleWriter is { } writer ? writer.CompleteAsync() : Task.CompletedTask;
         }
 
         public void Dispose()
         {
-            Dispose(disposing: true);
-            GC.SuppressFinalize(this);
+            _consoleWriter?.Dispose();
         }
     }
 }

src/WebJobs.Script/Config/ConsoleLoggingOptions.cs

@@ -1,6 +1,9 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
+using System;
+using System.IO;
+
 namespace Microsoft.Azure.WebJobs.Script.Config
 {
     public class ConsoleLoggingOptions
@@ -10,18 +13,17 @@ public class ConsoleLoggingOptions
         // So in the extreme case, this is about 1 second of buffer and should be less than 3MB
         public const int DefaultBufferSize = 8000;
 
-        public ConsoleLoggingOptions()
-        {
-            LoggingDisabled = false;
-            BufferEnabled = true;
-            BufferSize = DefaultBufferSize;
-        }
-
         public bool LoggingDisabled { get; set; }
 
         // Use BufferSize = 0 to disable the buffer
-        public bool BufferEnabled { get; internal set; }
+        public bool BufferEnabled { get; set; } = true;
+
+        public int BufferSize { get; set; } = DefaultBufferSize;
 
-        public int BufferSize { get; set; }
+        /// <summary>
+        /// Gets or sets the <see cref="TextWriter"/> to write logs to.
+        /// IMPORTANT: this is primarily for unit tests to redirect logs to a different writer.
+        /// </summary>
+        internal TextWriter Writer { get; set; } = Console.Out;
     }
 }