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NitroxModel/Logger/ConditionalValveSink.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using Serilog.Core;
+using Serilog.Events;
+using Serilog.Formatting;
+
+namespace NitroxModel.Logger;
+
+public class ConditionalValveSink : ILogEventSink
+{
+    private readonly Func<LogEvent, bool> thresholdPredicate;
+    private readonly ILogEventSink wrappedSink;
+    private readonly Queue<LogEvent> queue = new();
+
+    public ConditionalValveSink(Func<LogEvent, bool> thresholdPredicate, ILogEventSink wrappedSink)
+    {
+        this.thresholdPredicate = thresholdPredicate;
+        this.wrappedSink = wrappedSink;
+    }
+
+    public void Emit(LogEvent logEvent)
+    {
+        if (thresholdPredicate?.Invoke(logEvent) == true)
+        {
+            while (queue.Count > 0 && queue.Dequeue() is { } dequeuedEvent)
+            {
+                foreach (KeyValuePair<string,LogEventPropertyValue> pair in logEvent.Properties)
+                {
+                    dequeuedEvent.AddOrUpdateProperty(new LogEventProperty(pair.Key, pair.Value));
+                }
+                wrappedSink.Emit(dequeuedEvent);
+            }
+
+            wrappedSink.Emit(logEvent);
+        }
+        else
+        {
+            queue.Enqueue(logEvent);
+        }
+    }
+}