Updated

EonaCat.Logger/EonaCat.Logger.csproj

@@ -13,8 +13,8 @@
     <Copyright>EonaCat (Jeroen Saey)</Copyright>
     <PackageTags>EonaCat;Logger;EonaCatLogger;Log;Writer;Jeroen;Saey</PackageTags>
     <PackageIconUrl />
-    <Version>1.7.6</Version>
+    <Version>1.7.7</Version>
-    <FileVersion>1.7.6</FileVersion>
+    <FileVersion>1.7.7</FileVersion>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <GenerateDocumentationFile>True</GenerateDocumentationFile>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>

EonaCat.Logger/EonaCatCoreLogger/FileLoggerProvider.cs

@@ -6,6 +6,7 @@ using Microsoft.Extensions.Options;
 using System;
 using System.Buffers;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.IO.Compression;
 using System.Runtime.CompilerServices;
@@ -27,12 +28,16 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
     private readonly Channel<LogMessage> _channel;
     private readonly Thread _writerThread;
 
-    private readonly string _filePath;
+    private static readonly TimeSpan FlushInterval = TimeSpan.FromMilliseconds(500);
+    private long _lastFlushTicks = Stopwatch.GetTimestamp();
+
+    private string _filePath;
     private readonly int _maxFileSize;
     private readonly bool _encryptionEnabled;
 
     private readonly Aes _aes;
     private readonly ICryptoTransform _encryptor;
+    public event Action<Exception>? OnError;
 
     public bool IncludeCorrelationId { get; }
     public bool EnableCategoryRouting { get; }
@@ -45,6 +50,8 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
     [ThreadStatic]
     private static StringBuilder? _cachedStringBuilder;
 
+    public bool IsHealthy => _running && _stream != null;
+
     public string LogFile => _filePath;
     private volatile bool _running = true;
     private readonly int _maxRolloverFiles;
@@ -56,10 +63,23 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
     {
         var o = options.Value;
 
-        _filePath = Path.Combine(o.LogDirectory,
+        string primaryDirectory = o.LogDirectory;
-            $"{o.FileNamePrefix}_{Environment.MachineName}_{DateTime.UtcNow:yyyyMMdd}.log");
+        string fileName = $"{o.FileNamePrefix}_{Environment.MachineName}_{DateTime.UtcNow:yyyyMMdd}.log";
 
-        Directory.CreateDirectory(o.LogDirectory);
+        _filePath = Path.Combine(primaryDirectory, fileName);
+
+        if (!TryInitializePath(primaryDirectory, fileName))
+        {
+            // Fallback to temp path with required format: EonaCat_date.log
+            string tempDirectory = Path.GetTempPath();
+            string fallbackFileName = $"EonaCat_{DateTime.UtcNow:yyyyMMdd}.log";
+
+            if (!TryInitializePath(tempDirectory, fallbackFileName))
+            {
+                _running = false;
+                return;
+            }
+        }
 
         _maxFileSize = o.FileSizeLimit;
         _maxRolloverFiles = o.MaxRolloverFiles;
@@ -77,8 +97,18 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
         IncludeCorrelationId = o.IncludeCorrelationId;
         EnableCategoryRouting = o.EnableCategoryRouting;
 
+        try
+        {
             _stream = new FileStream(_filePath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite | FileShare.Delete, 1, FileOptions.WriteThrough | FileOptions.SequentialScan);
             _size = _stream.Length;
+        }
+        catch (Exception ex)
+        {
+            RaiseError(ex);
+            _running = false;
+            return;
+        }
+
         _buffer = ArrayPool<byte>.Shared.Rent(BufferSize);
 
         _channel = Channel.CreateBounded<LogMessage>(
@@ -98,6 +128,34 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
         _writerThread.Start();
     }
 
+    private bool TryInitializePath(string directory, string fileName)
+    {
+        try
+        {
+            Directory.CreateDirectory(directory);
+
+            string fullPath = Path.Combine(directory, fileName);
+
+            if (!EnsureWritable(fullPath))
+            {
+                return false;
+            }
+
+            _filePath = fullPath;
+
+            _stream = new FileStream(_filePath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite | FileShare.Delete, 1, FileOptions.WriteThrough | FileOptions.SequentialScan);
+            _size = _stream.Length;
+
+            return true;
+        }
+        catch (Exception ex)
+        {
+            RaiseError(ex);
+            return false;
+        }
+    }
+
+
     internal override Task WriteMessagesAsync(IReadOnlyList<LogMessage> messages, CancellationToken token)
     {
         for (int i = 0; i < messages.Count; i++)
@@ -116,6 +174,11 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
 
     private void WriterLoop()
     {
+        if (_stream == null)
+        {
+            return;
+        }
+
         var reader = _channel.Reader;
         var spin = new SpinWait();
 
@@ -126,7 +189,7 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
                 WriteMessage(message);
             }
 
-            FlushIfNeeded();
+            FlushIfNeededTimed();
 
             spin.SpinOnce();
         }
@@ -134,6 +197,33 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
         FlushFinal();
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void FlushIfNeededTimed()
+    {
+        if (_position == 0)
+        {
+            return;
+        }
+
+        var nowTicks = DateTime.UtcNow.Ticks;
+
+        // Size-based flush (existing behavior)
+        if (_position >= FlushThreshold)
+        {
+            FlushInternal();
+            _lastFlushTicks = nowTicks;
+            return;
+        }
+
+        // Time-based flush (new behavior)
+        if (nowTicks - _lastFlushTicks >= FlushInterval.Ticks)
+        {
+            FlushInternal();
+            _lastFlushTicks = nowTicks;
+        }
+    }
+
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     private void WriteMessage(LogMessage msg)
     {
@@ -268,8 +358,18 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
     }
 
     private void WriteDirect(byte[] data, int length)
+    {
+        try
         {
             _stream.Write(data, 0, length);
+        }
+        catch (Exception ex)
+        {
+            RaiseError(ex);
+            _running = false;
+            return;
+        }
+
         _size += length;
 
         if (_maxFileSize > 0 && _size >= _maxFileSize)
@@ -294,7 +394,16 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
             return;
         }
 
+        try
+        {
             _stream.Write(_buffer, 0, _position);
+        }
+        catch (Exception ex)
+        {
+            RaiseError(ex);
+            _running = false;
+        }
+
         _position = 0;
     }
 
@@ -307,6 +416,8 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
     private readonly object _rollLock = new();
 
     private void RollFile()
+    {
+        try
         {
             lock (_rollLock)
             {
@@ -327,6 +438,12 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
                 _size = 0;
             }
         }
+        catch (Exception ex)
+        {
+            RaiseError(ex);
+            _running = false;
+        }
+    }
     private void RotateCompressedFiles()
     {
         int maxFiles = _maxRolloverFiles;
@@ -362,6 +479,37 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
         }
     }
 
+    private bool EnsureWritable(string path)
+    {
+        try
+        {
+            string? directory = Path.GetDirectoryName(path);
+            if (string.IsNullOrWhiteSpace(directory))
+            {
+                return false;
+            }
+
+            Directory.CreateDirectory(directory);
+
+            // Test write access
+            using (var fs = new FileStream(
+                path,
+                FileMode.Append,
+                FileAccess.Write,
+                FileShare.ReadWrite | FileShare.Delete))
+            {
+                // Just opening is enough to validate permission
+            }
+
+            return true;
+        }
+        catch (Exception ex)
+        {
+            RaiseError(ex);
+            return false;
+        }
+    }
+
 
     private void CompressToIndex(string sourceFile, int index)
     {
@@ -395,6 +543,18 @@ public sealed class FileLoggerProvider : BatchingLoggerProvider, IDisposable
         return Task.CompletedTask;
     }
 
+    private void RaiseError(Exception ex)
+    {
+        try
+        {
+            OnError?.Invoke(ex);
+        }
+        catch
+        {
+            // Never allow logging failure to crash app
+        }
+    }
+
     public new void Dispose()
     {
         OnShutdownFlushAsync().GetAwaiter().GetResult();