added missing data

bsmd.util/LokiAppender.cs

@@ -1,59 +1,155 @@
-namespace bsmd.util
+// Copyright (c) 2025 schick Informatik
+// Description: Appender for Loki/Grafana remote logging
+// 
+
+namespace bsmd.util
 {
 
     using log4net.Appender;
     using log4net.Core;
     using Newtonsoft.Json;
     using System;
+    using System.Collections.Concurrent;
+    using System.Collections.Generic;
     using System.Net.Http;
     using System.Text;
+    using System.Threading;
     using System.Threading.Tasks;
 
     public class LokiAppender : AppenderSkeleton
     {
 
+        #region Fields
+
+        private static readonly HttpClient _httpClient = new HttpClient();
+
+        private readonly ConcurrentQueue<Tuple<string, string>> _logQueue = new ConcurrentQueue<Tuple<string, string>>();
+
+        private readonly CancellationTokenSource _cts = new CancellationTokenSource();
+
+        private bool _batchingStarted = false;
+
+        private readonly object _batchLock = new object();
+
+        #endregion
+
+        #region Properties
+
         public string LokiUrl { get; set; }
         public string ApplicationName { get; set; } = "log4net-app";
 
-        private static readonly HttpClient httpClient = new HttpClient();
+        public int BatchSize { get; set; } = 10;
+
+        public int BatchIntervalMs { get; set; } = 2000;
+
+        public int MaxRetries { get; set; } = 5;
+
+        #endregion
+
+        #region overrides
 
         protected override void Append(LoggingEvent loggingEvent)
         {
-            try
-            {
-                var timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds().ToString() + "000000"; // nanoseconds
-                var message = RenderLoggingEvent(loggingEvent);
+            string timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() + "000000";
+            string message = RenderLoggingEvent(loggingEvent);
 
-                var payload = new
+            _logQueue.Enqueue(new Tuple<string, string>(timestamp, message));
+
+            // Start background batch loop once
+            if (!_batchingStarted)
+            {
+                lock (_batchLock)
                 {
-                    streams = new[]
+                    if (!_batchingStarted)
                     {
+                        _ = Task.Run(() => BatchLoop(_cts.Token));
+                        _batchingStarted = true;
+                    }
+                }
+            }
+        }        
+
+        private async Task BatchLoop(CancellationToken ct)
+        {
+            while (!ct.IsCancellationRequested)
+            {
+                try
+                {
+                    await Task.Delay(BatchIntervalMs, ct);
+
+                    var batch = new List<Tuple<string, string>>();
+                    while (batch.Count < BatchSize && _logQueue.TryDequeue(out var entry))
+                        batch.Add(entry);
+
+                    if (batch.Count == 0) continue;
+
+                    var payload = new
+                    {
+                        streams = new[]
+                        {
                         new
                         {
                             stream = new
                             {
                                 app = ApplicationName,
-                                level = loggingEvent.Level.Name.ToLower()
+                                level = "info" // Optional: capture log level from batch
                             },
-                            values = new[]
-                            {
-                                new[] { timestamp, message }
-                            }
+                            values = batch.ConvertAll(e => new[] { e.Item1, e.Item2 })
                         }
                     }
-                };
+                    };
 
-                var json = JsonConvert.SerializeObject(payload);
+                    string json = JsonConvert.SerializeObject(payload);
+                    var content = new StringContent(json, Encoding.UTF8, "application/json");
 
-                var content = new StringContent(json, Encoding.UTF8, "application/json");
-
-                // Fire and forget
-                Task.Run(() => httpClient.PostAsync(LokiUrl, content));
-            }
-            catch (Exception ex)
-            {
-                ErrorHandler.Error("Error sending log to Loki", ex);
+                    await SendWithRetry(content, MaxRetries, ct);
+                }
+                catch (OperationCanceledException)
+                {
+                    // Graceful shutdown
+                }
+                catch (Exception ex)
+                {
+                    ErrorHandler.Error("Error in Loki batch loop", ex);
+                }
             }
         }
+
+        private async Task SendWithRetry(HttpContent content, int maxRetries, CancellationToken ct)
+        {
+            int attempt = 0;
+            TimeSpan delay = TimeSpan.FromSeconds(1);
+
+            while (attempt <= maxRetries && !ct.IsCancellationRequested)
+            {
+                try
+                {
+                    var response = await _httpClient.PostAsync(LokiUrl, content, ct);
+                    if (response.IsSuccessStatusCode)
+                        return;
+
+                    attempt++;
+                    await Task.Delay(delay, ct);
+                    delay = TimeSpan.FromSeconds(delay.TotalSeconds * 2); // exponential backoff
+                }
+                catch
+                {
+                    attempt++;
+                    await Task.Delay(delay, ct);
+                    delay = TimeSpan.FromSeconds(delay.TotalSeconds * 2);
+                }
+            }
+
+            ErrorHandler.Error($"Failed to send logs to Loki after {attempt} retries.");
+        }
+
+        protected override void OnClose()
+        {
+            _cts.Cancel();
+            base.OnClose();
+        }
+
+        #endregion
+
     }
 }

bsmd.util/bsmd.util.csproj

@@ -53,6 +53,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="bsmd.util.licenseheader" />
     <None Include="packages.config" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

bsmd.util/bsmd.util.licenseheader

@@ -0,0 +1,5 @@
+extensions: designer.cs generated.cs
+extensions: .cs .cpp .h
+// Copyright (c) 2025 schick Informatik
+// Description:
+//