fix: #146, file size limit

src/Serilog.Sinks.File/FileLoggerConfigurationExtensions.cs

@@ -32,7 +32,7 @@ namespace Serilog
     public static class FileLoggerConfigurationExtensions
     {
         const int DefaultRetainedFileCountLimit = 31; // A long month of logs
-        const long DefaultFileSizeLimitBytes = 1L * 1024 * 1024 * 1024;
+        const long DefaultFileSizeLimitBytes = 1L * 1024 * 1024 * 1024; // 1GB
         const string DefaultOutputTemplate = "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] {Message:lj}{NewLine}{Exception}";
 
         /// <summary>
@@ -181,7 +181,7 @@ public static LoggerConfiguration File(
         /// <param name="shared">Allow the log file to be shared by multiple processes. The default is false.</param>
         /// <param name="flushToDiskInterval">If provided, a full disk flush will be performed periodically at the specified interval.</param>
         /// <param name="rollingInterval">The interval at which logging will roll over to a new file.</param>
-        /// <param name="rollOnFileSizeLimit">If <code>true</code>, a new file will be created when the file size limit is reached. Filenames 
+        /// <param name="rollOnFileSizeLimit">If <code>true</code>, a new file will be created when the file size limit is reached. Filenames
         /// will have a number appended in the format <code>_NNN</code>, with the first filename given no number.</param>
         /// <param name="retainedFileCountLimit">The maximum number of log files that will be retained,
         /// including the current log file. For unlimited retention, pass null. The default is 31.</param>
@@ -227,7 +227,7 @@ public static LoggerConfiguration File(
         /// <param name="shared">Allow the log file to be shared by multiple processes. The default is false.</param>
         /// <param name="flushToDiskInterval">If provided, a full disk flush will be performed periodically at the specified interval.</param>
         /// <param name="rollingInterval">The interval at which logging will roll over to a new file.</param>
-        /// <param name="rollOnFileSizeLimit">If <code>true</code>, a new file will be created when the file size limit is reached. Filenames 
+        /// <param name="rollOnFileSizeLimit">If <code>true</code>, a new file will be created when the file size limit is reached. Filenames
         /// will have a number appended in the format <code>_NNN</code>, with the first filename given no number.</param>
         /// <param name="retainedFileCountLimit">The maximum number of log files that will be retained,
         /// including the current log file. For unlimited retention, pass null. The default is 31.</param>
@@ -377,7 +377,7 @@ public static LoggerConfiguration File(
         {
             return File(sinkConfiguration, formatter, path, restrictedToMinimumLevel, levelSwitch, null, null);
         }
-        
+
         /// <summary>
         /// Write audit log events to the specified file.
         /// </summary>
@@ -466,7 +466,7 @@ static LoggerConfiguration ConfigureFile(
             if (addSink == null) throw new ArgumentNullException(nameof(addSink));
             if (formatter == null) throw new ArgumentNullException(nameof(formatter));
             if (path == null) throw new ArgumentNullException(nameof(path));
-            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 0) throw new ArgumentException("Negative value provided; file size limit must be non-negative.", nameof(fileSizeLimitBytes));
+            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 1) throw new ArgumentException("Invalid value provided; file size limit must be at least 1 byte, or null.", nameof(fileSizeLimitBytes));
             if (retainedFileCountLimit.HasValue && retainedFileCountLimit < 1) throw new ArgumentException("At least one file must be retained.", nameof(retainedFileCountLimit));
             if (retainedFileTimeLimit.HasValue && retainedFileTimeLimit < TimeSpan.Zero) throw new ArgumentException("Negative value provided; retained file time limit must be non-negative.", nameof(retainedFileTimeLimit));
             if (shared && buffered) throw new ArgumentException("Buffered writes are not available when file sharing is enabled.", nameof(buffered));

src/Serilog.Sinks.File/Sinks/File/FileSink.cs

@@ -61,7 +61,7 @@ internal FileSink(
             FileLifecycleHooks hooks)
         {
             if (path == null) throw new ArgumentNullException(nameof(path));
-            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 0) throw new ArgumentException("Negative value provided; file size limit must be non-negative.");
+            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 1) throw new ArgumentException("Invalid value provided; file size limit must be at least 1 byte, or null.");
             _textFormatter = textFormatter ?? throw new ArgumentNullException(nameof(textFormatter));
             _fileSizeLimitBytes = fileSizeLimitBytes;
             _buffered = buffered;

src/Serilog.Sinks.File/Sinks/File/RollingFileSink.cs

@@ -55,7 +55,7 @@ public RollingFileSink(string path,
                               TimeSpan? retainedFileTimeLimit)
         {
             if (path == null) throw new ArgumentNullException(nameof(path));
-            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 0) throw new ArgumentException("Negative value provided; file size limit must be non-negative");
+            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 1) throw new ArgumentException("Invalid value provided; file size limit must be at least 1 byte, or null.");
             if (retainedFileCountLimit.HasValue && retainedFileCountLimit < 1) throw new ArgumentException("Zero or negative value provided; retained file count limit must be at least 1");
             if (retainedFileTimeLimit.HasValue && retainedFileTimeLimit < TimeSpan.Zero) throw new ArgumentException("Negative value provided; retained file time limit must be non-negative.", nameof(retainedFileTimeLimit));
 
@@ -223,7 +223,7 @@ bool ShouldRetainFile(RollingLogFile file, int index, DateTime now)
             {
                 return false;
             }
-            
+
             return true;
         }
 

src/Serilog.Sinks.File/Sinks/File/SharedFileSink.AtomicAppend.cs

@@ -53,8 +53,8 @@ public sealed class SharedFileSink : IFileSink, IDisposable
         /// <exception cref="IOException"></exception>
         public SharedFileSink(string path, ITextFormatter textFormatter, long? fileSizeLimitBytes, Encoding encoding = null)
         {
-            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 0)
-                throw new ArgumentException("Negative value provided; file size limit must be non-negative");
+            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 1)
+                throw new ArgumentException("Invalid value provided; file size limit must be at least 1 byte, or null");
 
             _path = path ?? throw new ArgumentNullException(nameof(path));
             _textFormatter = textFormatter ?? throw new ArgumentNullException(nameof(textFormatter));

src/Serilog.Sinks.File/Sinks/File/SharedFileSink.OSMutex.cs

@@ -53,8 +53,8 @@ public sealed class SharedFileSink : IFileSink, IDisposable
         public SharedFileSink(string path, ITextFormatter textFormatter, long? fileSizeLimitBytes, Encoding encoding = null)
         {
             if (path == null) throw new ArgumentNullException(nameof(path));
-            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 0)
-                throw new ArgumentException("Negative value provided; file size limit must be non-negative");
+            if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 1)
+                throw new ArgumentException("Invalid value provided; file size limit must be at least 1 byte, or null.");
             _textFormatter = textFormatter ?? throw new ArgumentNullException(nameof(textFormatter));
             _fileSizeLimitBytes = fileSizeLimitBytes;