Updated

EonaCat.Logger/EonaCat.Logger.csproj

@@ -3,7 +3,7 @@
     <TargetFrameworks>.netstandard2.1; net6.0; net7.0; net8.0; net4.8;</TargetFrameworks>
     <ApplicationIcon>icon.ico</ApplicationIcon>
 	<LangVersion>latest</LangVersion>
-    <FileVersion>1.3.4</FileVersion>
+    <FileVersion>1.3.5</FileVersion>
     <Authors>EonaCat (Jeroen Saey)</Authors>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <Company>EonaCat (Jeroen Saey)</Company>
@@ -24,7 +24,7 @@
   </PropertyGroup>
 
 	<PropertyGroup>
-		<EVRevisionFormat>1.3.4+{chash:10}.{c:ymd}</EVRevisionFormat>
+		<EVRevisionFormat>1.3.5+{chash:10}.{c:ymd}</EVRevisionFormat>
 		<EVDefault>true</EVDefault>
 		<EVInfo>true</EVInfo>
 		<EVTagMatch>v[0-9]*</EVTagMatch>

EonaCat.Logger/GrayLog/GrayLogServer.cs

@@ -77,6 +77,8 @@ public class GrayLogServer
     /// </summary>
     public string IpPort => _Hostname + ":" + _Port;
 
+    public bool SupportsTcp { get; set; }
+
     private void SetUdp()
     {
         Udp = null;

EonaCat.Logger/Managers/LogHelper.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Net.Sockets;
 using System.Text;
 using System.Threading.Tasks;
 using EonaCat.Json;
@@ -144,33 +145,36 @@ internal static class LogHelper
 
     public static async Task SendToSplunkServersAsync(LoggerSettings settings, SplunkPayload splunkPayload, bool sendToSplunkServer)
     {
-        if (settings == null || !sendToSplunkServer || splunkPayload == null) return;
+        if (settings == null || !sendToSplunkServer || splunkPayload == null)
-
-        foreach (var splunkServer in settings.SplunkServers ?? Enumerable.Empty<SplunkServer.SplunkServer>())
         {
-            if (!splunkServer.HasHecUrl || !splunkServer.HasHecToken)
+            return;
-            {
-                OnException?.Invoke(null, new ErrorMessage { Message = $"Invalid Splunk server configuration for '{splunkServer.SplunkHecUrl}'" });
-                continue;
         }
 
+        var tasks = settings.SplunkServers?
+            .Where(splunkServer => splunkServer.HasHecUrl && splunkServer.HasHecToken)
+            .Select(async splunkServer =>
+            {
                 try
                 {
                     var response = await splunkServer.SendAsync(splunkPayload);
                     if (!response.IsSuccessStatusCode)
                     {
-                    OnException?.Invoke(null, new ErrorMessage { Message = $"Failed to send log to Splunk '{splunkServer.SplunkHecUrl}'. Status code: {response.StatusCode}" });
+                        LogError($"Failed to send log to Splunk '{splunkServer.SplunkHecUrl}'. Status code: {response.StatusCode}");
                     }
                 }
                 catch (Exception ex)
                 {
-                OnException?.Invoke(null, new ErrorMessage { Exception = ex, Message = $"Error logging to Splunk '{splunkServer.SplunkHecUrl}': {ex.Message}" });
+                    LogError($"Error logging to Splunk '{splunkServer.SplunkHecUrl}': {ex.Message}", ex);
-            }
                 }
+            }) ?? new List<Task>();
+
+        await Task.WhenAll(tasks);
     }
 
-    public static async Task SendToSplunkServersAsync(LoggerSettings settings, string logType, string message,
+    /// <summary>
-        bool sendToSplunkServer)
+    /// Overload for sending a simple log message to Splunk.
+    /// </summary>
+    public static async Task SendToSplunkServersAsync(LoggerSettings settings, string logType, string message, bool sendToSplunkServer)
     {
         if (settings == null || !sendToSplunkServer || string.IsNullOrWhiteSpace(message))
         {
@@ -187,6 +191,15 @@ internal static class LogHelper
         await SendToSplunkServersAsync(settings, splunkPayload, sendToSplunkServer);
     }
 
+    /// <summary>
+    /// Logs an error using the OnException event.
+    /// </summary>
+    private static void LogError(string message, Exception ex = null)
+    {
+        OnException?.Invoke(null, new ErrorMessage { Message = message, Exception = ex });
+    }
+
+
     internal static async Task SendToGrayLogServersAsync(LoggerSettings settings, string message, ELogType logLevel,
     string facility, string source, bool sendToGrayLogServer, string version = "1.1")
     {
@@ -195,10 +208,8 @@ internal static class LogHelper
             return;
         }
 
-        foreach (var grayLogServer in settings.GrayLogServers ?? new List<GrayLogServer> { new("127.0.0.1") })
+        const int MaxUdpPacketSize = 4096;
-        {
+
-            try
-            {
         var gelfMessage = new
         {
             version,
@@ -211,62 +222,138 @@ internal static class LogHelper
         };
 
         var messageBytes = Encoding.UTF8.GetBytes(JsonHelper.ToJson(gelfMessage));
+
+        var tasks = settings.GrayLogServers?
+            .Where(server => !string.IsNullOrWhiteSpace(server.Hostname) && server.Port >= 0)
+            .Select(async grayLogServer =>
+            {
+                try
+                {
+                    if (messageBytes.Length <= MaxUdpPacketSize)
+                    {
+                        // Send via UDP (single packet)
                         await grayLogServer.Udp.SendAsync(messageBytes, messageBytes.Length);
                     }
-            catch (Exception exception)
+                    else if (grayLogServer.SupportsTcp)
                     {
-                OnException?.Invoke(null,
+                        // Send via TCP if supported
-                    new ErrorMessage
+                        await SendViaTcpAsync(grayLogServer, messageBytes);
+                    }
+                    else
                     {
-                        Exception = exception,
+                        // Chunk large messages for UDP
-                        Message =
+                        await SendUdpInChunksAsync(grayLogServer, messageBytes, MaxUdpPacketSize);
-                            $"Error while logging to GrayLog Server '{grayLogServer.Hostname}': {exception.Message}"
+                    }
+                }
+                catch (Exception ex)
+                {
+                    OnException?.Invoke(null, new ErrorMessage
+                    {
+                        Exception = ex,
+                        Message = $"Error logging to GrayLog Server '{grayLogServer.Hostname}': {ex.Message}"
                     });
                 }
+            }) ?? new List<Task>();
+
+        await Task.WhenAll(tasks);
+    }
+
+
+    /// <summary>
+    /// Sends a message via TCP to a GrayLog server.
+    /// </summary>
+    private static async Task SendViaTcpAsync(GrayLogServer server, byte[] data)
+    {
+        using var tcpClient = new TcpClient();
+        await tcpClient.ConnectAsync(server.Hostname, server.Port);
+        using var stream = tcpClient.GetStream();
+        await stream.WriteAsync(data, 0, data.Length);
+        await stream.FlushAsync();
+    }
+
+    /// <summary>
+    /// Sends large messages in chunks over UDP.
+    /// </summary>
+    private static async Task SendUdpInChunksAsync(GrayLogServer server, byte[] data, int chunkSize)
+    {
+        for (int i = 0; i < data.Length; i += chunkSize)
+        {
+            var chunk = data.Skip(i).Take(chunkSize).ToArray();
+            await server.Udp.SendAsync(chunk, chunk.Length);
         }
     }
 
-    internal static async Task SendToSysLogServersAsync(LoggerSettings settings, string message,
+    internal static async Task SendToSysLogServersAsync(LoggerSettings settings, string message, bool sendToSyslogServers)
-        bool sendToSyslogServers)
     {
         if (settings == null || !sendToSyslogServers || string.IsNullOrWhiteSpace(message))
         {
             return;
         }
 
-        foreach (var server in settings.SysLogServers ?? new List<SyslogServer> { new("127.0.0.1") })
+        const int MaxUdpPacketSize = 4096;
+
+        var tasks = settings.SysLogServers?
+            .Where(server => !string.IsNullOrWhiteSpace(server.Hostname) && server.Port >= 0)
+            .Select(async server =>
             {
                 try
                 {
-                if (string.IsNullOrWhiteSpace(server.Hostname))
-                {
-                    OnException?.Invoke(null,
-                        new ErrorMessage { Message = "Server hostname not specified, skipping SysLog Server" });
-                    continue;
-                }
-
-                if (server.Port < 0)
-                {
-                    OnException?.Invoke(null,
-                        new ErrorMessage { Message = "Server port must be zero or greater, skipping SysLog Server" });
-                    continue;
-                }
-
                     var data = Encoding.UTF8.GetBytes(message);
+
+                    if (data.Length <= MaxUdpPacketSize)
+                    {
+                        // Send via UDP (single packet)
                         await server.Udp.SendAsync(data, data.Length);
                     }
-            catch (Exception exception)
+                    else if (server.SupportsTcp)
                     {
-                OnException?.Invoke(null,
+                        // Send via TCP if supported
-                    new ErrorMessage
+                        await SendViaTcpAsync(server, data);
+                    }
+                    else
                     {
-                        Exception = exception,
+                        // Chunk large messages for UDP
-                        Message = $"Error while logging to SysLog Server '{server.Hostname}': {exception.Message}"
+                        await SendUdpInChunksAsync(server, data, MaxUdpPacketSize);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    OnException?.Invoke(null, new ErrorMessage
+                    {
+                        Exception = ex,
+                        Message = $"Error logging to SysLog Server '{server.Hostname}': {ex.Message}"
                     });
                 }
+            }) ?? new List<Task>();
+
+        await Task.WhenAll(tasks);
+    }
+
+    /// <summary>
+    /// Sends a message via TCP to a syslog server.
+    /// </summary>
+    private static async Task SendViaTcpAsync(SyslogServer server, byte[] data)
+    {
+        using var tcpClient = new TcpClient();
+        await tcpClient.ConnectAsync(server.Hostname, server.Port);
+        using var stream = tcpClient.GetStream();
+        await stream.WriteAsync(data, 0, data.Length);
+        await stream.FlushAsync();
+    }
+
+    /// <summary>
+    /// Sends large messages in chunks over UDP.
+    /// </summary>
+    private static async Task SendUdpInChunksAsync(SyslogServer server, byte[] data, int chunkSize)
+    {
+        for (int i = 0; i < data.Length; i += chunkSize)
+        {
+            var chunk = data.Skip(i).Take(chunkSize).ToArray();
+            await server.Udp.SendAsync(chunk, chunk.Length);
         }
     }
 
+
     internal static string GetStartupMessage()
     {
         return $"{DllInfo.ApplicationName} started.";

EonaCat.Logger/Syslog/SyslogServer.cs

@@ -77,6 +77,8 @@ public class SyslogServer
     /// </summary>
     public string IpPort => _Hostname + ":" + _Port;
 
+    public bool SupportsTcp { get; set; }
+
     private void SetUdp()
     {
         Udp = null;