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Classes/LogBuffer.cs

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+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace Mocha2023.Classes;
+
+public static class LogBuffer
+{
+    private const int MaxLines = 5000;
+    private static readonly object Lock = new();
+    private static readonly LinkedList<string> Lines = new();
+
+    public static void Add(string line)
+    {
+        lock (Lock)
+        {
+            Lines.AddLast(line);
+            while (Lines.Count > MaxLines)
+                Lines.RemoveFirst();
+        }
+    }
+
+    public static List<string> Snapshot(int take = 500)
+    {
+        lock (Lock)
+            return Lines.Skip(Math.Max(0, Lines.Count - take)).ToList();
+    }
+}
+
+internal sealed class TeeTextWriter : TextWriter
+{
+    private readonly TextWriter inner;
+
+    public TeeTextWriter(TextWriter inner) => this.inner = inner;
+
+    public override Encoding Encoding => inner.Encoding;
+
+    public override void Write(char value) => inner.Write(value);
+
+    public override void Write(string? value) => inner.Write(value);
+
+    public override void WriteLine(string? value)
+    {
+        inner.WriteLine(value);
+        LogBuffer.Add($"[{DateTime.UtcNow:HH:mm:ss}] {value}");
+    }
+}
+
+internal static class LogBufferInitializer
+{
+    [ModuleInitializer]
+    public static void Init()
+    {
+        Console.SetOut(new TeeTextWriter(Console.Out));
+    }
+}