Updates for Serilog 4

Build.ps1

@@ -1,46 +1,42 @@
-echo "build: Build started"
+Write-Output "build: Build started"
 
 Push-Location $PSScriptRoot
 
 if(Test-Path .\artifacts) {
-	echo "build: Cleaning .\artifacts"
-	Remove-Item .\artifacts -Force -Recurse
+	Write-Output "build: Cleaning ./artifacts"
+	Remove-Item ./artifacts -Force -Recurse
 }
 
 & dotnet restore --no-cache
 
-$branch = @{ $true = $env:APPVEYOR_REPO_BRANCH; $false = $(git symbolic-ref --short -q HEAD) }[$env:APPVEYOR_REPO_BRANCH -ne $NULL];
-$revision = @{ $true = "{0:00000}" -f [convert]::ToInt32("0" + $env:APPVEYOR_BUILD_NUMBER, 10); $false = "local" }[$env:APPVEYOR_BUILD_NUMBER -ne $NULL];
+$branch = @{ $true = $env:APPVEYOR_REPO_BRANCH; $false = $(git symbolic-ref --short -q HEAD) }[$NULL -ne $env:APPVEYOR_REPO_BRANCH];
+$revision = @{ $true = "{0:00000}" -f [convert]::ToInt32("0" + $env:APPVEYOR_BUILD_NUMBER, 10); $false = "local" }[$NULL -ne $env:APPVEYOR_BUILD_NUMBER];
 $suffix = @{ $true = ""; $false = "$($branch.Substring(0, [math]::Min(10,$branch.Length)))-$revision"}[$branch -eq "main" -and $revision -ne "local"]
-$commitHash = $(git rev-parse --short HEAD)
-$buildSuffix = @{ $true = "$($suffix)-$($commitHash)"; $false = "$($branch)-$($commitHash)" }[$suffix -ne ""]
 
-echo "build: Package version suffix is $suffix"
-echo "build: Build version suffix is $buildSuffix"
+Write-Output "build: Package version suffix is $suffix"
 
-foreach ($src in ls src/*) {
+foreach ($src in Get-ChildItem src/*) {
     Push-Location $src
 
-	echo "build: Packaging project in $src"
+	Write-Output "build: Packaging project in $src"
 
-    & dotnet build -c Release --version-suffix=$buildSuffix -p:EnableSourceLink=true
     if ($suffix) {
-        & dotnet pack -c Release -o ..\..\artifacts --version-suffix=$suffix --no-build
+        & dotnet pack -c Release --include-source -o ../../artifacts --version-suffix=$suffix
     } else {
-        & dotnet pack -c Release -o ..\..\artifacts --no-build
+        & dotnet pack -c Release --include-source -o ../../artifacts
     }
-    if($LASTEXITCODE -ne 0) { exit 1 }
+    if($LASTEXITCODE -ne 0) { throw "Packaging failed" }
 
     Pop-Location
 }
 
-foreach ($test in ls test/*.Tests) {
+foreach ($test in Get-ChildItem test/*.Tests) {
     Push-Location $test
 
-	echo "build: Testing project in $test"
+	Write-Output "build: Testing project in $test"
 
     & dotnet test -c Release
-    if($LASTEXITCODE -ne 0) { exit 3 }
+    if($LASTEXITCODE -ne 0) { throw "Testing failed" }
 
     Pop-Location
 }

Directory.Build.props

@@ -7,6 +7,7 @@
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)assets/Serilog.snk</AssemblyOriginatorKeyFile>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
+    <LangVersion>latest</LangVersion>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
     <Reference Include="System" />

README.md

@@ -7,7 +7,7 @@ Writes [Serilog](https://serilog.net) events to one or more text files.
 Install the [Serilog.Sinks.File](https://www.nuget.org/packages/Serilog.Sinks.File/) package from NuGet:
 
 ```powershell
-Install-Package Serilog.Sinks.File
+dotnet add package Serilog.Sinks.File
 ```
 
 To configure the sink in C# code, call `WriteTo.File()` during logger configuration:
@@ -36,7 +36,7 @@ The limit can be changed or removed using the `fileSizeLimitBytes` parameter.
 
 ```csharp
     .WriteTo.File("log.txt", fileSizeLimitBytes: null)
-``` 
+```
 
 For the same reason, only **the most recent 31 files** are retained by default (i.e. one long month). To change or remove this limit, pass the `retainedFileCountLimit` parameter.
 

appveyor.yml

@@ -2,9 +2,9 @@ version: '{build}'
 skip_tags: true
 image:
   - Visual Studio 2022
-  - Ubuntu
+  - Ubuntu2204
 build_script:
-- ps: ./Build.ps1
+- pwsh: ./Build.ps1
 for:
 -
   matrix:
@@ -19,7 +19,7 @@ artifacts:
 deploy:
 - provider: NuGet
   api_key:
-    secure: LE+O+3Zs0nz2F/+M4eDvKBhEBUpUV0t864vN/2dxwa7aIVqeU3pKSMjWRX+JWJ49
+    secure: sDnchSg4TZIOK7oIUI6BJwFPNENTOZrGNsroGO1hehLJSvlHpFmpTwiX8+bgPD+Q
   on:
     branch: /^(main|dev)$/
 - provider: GitHub

example/Sample/Program.cs

@@ -1,35 +1,27 @@
 using Serilog;
 using Serilog.Debugging;
 
-namespace Sample;
+SelfLog.Enable(Console.Out);
 
-public class Program
-{
-    public static void Main(string[] args)
-    {
-        SelfLog.Enable(Console.Out);
-
-        var sw = System.Diagnostics.Stopwatch.StartNew();
+var sw = System.Diagnostics.Stopwatch.StartNew();
 
-        Log.Logger = new LoggerConfiguration()
-            .WriteTo.File("log.txt")
-            .CreateLogger();
+Log.Logger = new LoggerConfiguration()
+    .WriteTo.File("log.txt")
+    .CreateLogger();
 
-        for (var i = 0; i < 1000000; ++i)
-        {
-            Log.Information("Hello, file logger!");
-        }
+for (var i = 0; i < 1000000; ++i)
+{
+    Log.Information("Hello, file logger!");
+}
 
-        Log.CloseAndFlush();
+Log.CloseAndFlush();
 
-        sw.Stop();
+sw.Stop();
 
-        Console.WriteLine($"Elapsed: {sw.ElapsedMilliseconds} ms");
-        Console.WriteLine($"Size: {new FileInfo("log.txt").Length}");
+Console.WriteLine($"Elapsed: {sw.ElapsedMilliseconds} ms");
+Console.WriteLine($"Size: {new FileInfo("log.txt").Length}");
 
-        Console.WriteLine("Press any key to delete the temporary log file...");
-        Console.ReadKey(true);
+Console.WriteLine("Press any key to delete the temporary log file...");
+Console.ReadKey(true);
 
-        File.Delete("log.txt");
-    }
-}
+File.Delete("log.txt");

example/Sample/Sample.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net48;net6.0</TargetFrameworks>
+    <TargetFrameworks>net48;net8.0</TargetFrameworks>
     <OutputType>Exe</OutputType>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>

src/Serilog.Sinks.File/FileLoggerConfigurationExtensions.cs

@@ -518,8 +518,8 @@ 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 < 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 (fileSizeLimitBytes is < 1) throw new ArgumentException("Invalid value provided; file size limit must be at least 1 byte, or null.", nameof(fileSizeLimitBytes));
+        if (retainedFileCountLimit is < 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));
         if (shared && hooks != null) throw new ArgumentException("File lifecycle hooks are not currently supported for shared log files.", nameof(hooks));

src/Serilog.Sinks.File/Serilog.Sinks.File.csproj

@@ -2,42 +2,53 @@
 
   <PropertyGroup>
     <Description>Write Serilog events to text files in plain or JSON format.</Description>
-    <VersionPrefix>5.0.1</VersionPrefix>
+    <VersionPrefix>6.0.0</VersionPrefix>
     <Authors>Serilog Contributors</Authors>
-    <TargetFrameworks>net45;netstandard1.3;netstandard2.0;netstandard2.1;net5.0;net6.0</TargetFrameworks>
+    <!-- .NET Framework version targeting is frozen at these two TFMs. -->
+    <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT'">net471;net462</TargetFrameworks>
+    <!-- Policy is to trim TFM-specific builds to `netstandard2.0`, `net6.0`,
+    all active LTS versions, and optionally the latest RTM version, when releasing new
+    major Serilog versions. -->
+    <TargetFrameworks>$(TargetFrameworks);net8.0;net6.0;netstandard2.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>serilog;file</PackageTags>
-    <PackageIcon>images\icon.png</PackageIcon>
+    <PackageIcon>serilog-sink-nuget.png</PackageIcon>
     <PackageIconUrl>https://serilog.net/images/serilog-sink-nuget.png</PackageIconUrl>
     <PackageProjectUrl>https://github.com/serilog/serilog-sinks-file</PackageProjectUrl>
     <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <RepositoryUrl>https://github.com/serilog/serilog-sinks-file</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <RootNamespace>Serilog</RootNamespace>
-    <DisableImplicitFrameworkReferences Condition=" '$(TargetFramework)' == 'netstandard1.3' ">true</DisableImplicitFrameworkReferences>
-    <EnableSourceLink Condition="'$(EnableSourceLink)' == ''">false</EnableSourceLink>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
-    <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
     <IncludeSymbols>True</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
-    <PackageReference Include="Serilog" Version="2.10.0" />
+    <PackageReference Include="Serilog" Version="4.0.0" />
     <PackageReference Include="Nullable" Version="1.3.1" PrivateAssets="All" />
   </ItemGroup>
 
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'net45' ">
+  <PropertyGroup Condition=" '$(TargetFrameworkIdentifier)' == '.NETFramework' ">
     <DefineConstants>$(DefineConstants);ATOMIC_APPEND;HRESULTS</DefineConstants>
   </PropertyGroup>
 
-  <PropertyGroup Condition=" '$(TargetFramework)' != 'net45'  ">
+  <PropertyGroup Condition=" '$(TargetFrameworkIdentifier)' != '.NETFramework' ">
     <DefineConstants>$(DefineConstants);OS_MUTEX</DefineConstants>
   </PropertyGroup>
 
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net6.0' ">
+    <DefineConstants>$(DefineConstants);ENUMERABLE_MAXBY</DefineConstants>
+  </PropertyGroup>
+
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net8.0' ">
+    <DefineConstants>$(DefineConstants);ENUMERABLE_MAXBY</DefineConstants>
+  </PropertyGroup>
+
   <ItemGroup>
-    <None Include="..\..\assets\serilog-sink-nuget.png" Pack="true" Visible="false" PackagePath="images\icon.png" />
+    <None Include="..\..\assets\serilog-sink-nuget.png" Pack="true" Visible="false" PackagePath="/" />
+    <None Include="..\..\README.md" Pack="true" Visible="false" PackagePath="/" />
   </ItemGroup>
 
 </Project>

src/Serilog.Sinks.File/Sinks/File/FileLifeCycleHookChain.cs

@@ -16,10 +16,10 @@
 
 namespace Serilog.Sinks.File;
 
-class FileLifeCycleHookChain : FileLifecycleHooks
+sealed class FileLifeCycleHookChain : FileLifecycleHooks
 {
-    private readonly FileLifecycleHooks _first;
-    private readonly FileLifecycleHooks _second;
+    readonly FileLifecycleHooks _first;
+    readonly FileLifecycleHooks _second;
 
     public FileLifeCycleHookChain(FileLifecycleHooks first, FileLifecycleHooks second)
     {

src/Serilog.Sinks.File/Sinks/File/FileLifecycleHooks.cs

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 using System.Text;
+// ReSharper disable UnusedMember.Global
 
 namespace Serilog.Sinks.File;
 

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

@@ -67,7 +67,7 @@ internal FileSink(
         FileLifecycleHooks? hooks)
     {
         if (path == null) throw new ArgumentNullException(nameof(path));
-        if (fileSizeLimitBytes.HasValue && fileSizeLimitBytes < 1) throw new ArgumentException("Invalid value provided; file size limit must be at least 1 byte, or null.");
+        if (fileSizeLimitBytes is < 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/NullSink.cs

@@ -21,9 +21,9 @@ namespace Serilog.Sinks.File;
 /// An instance of this sink may be substituted when an instance of the
 /// <see cref="FileSink"/> is unable to be constructed.
 /// </summary>
-class NullSink : ILogEventSink
+sealed class NullSink : ILogEventSink
 {
     public void Emit(LogEvent logEvent)
     {
     }
-}
+}

src/Serilog.Sinks.File/Sinks/File/PathRoller.cs

@@ -17,7 +17,7 @@
 
 namespace Serilog.Sinks.File;
 
-class PathRoller
+sealed class PathRoller
 {
     const string PeriodMatchGroup = "period";
     const string SequenceNumberMatchGroup = "sequence";

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

@@ -52,8 +52,8 @@ public RollingFileSink(string path,
                           TimeSpan? retainedFileTimeLimit)
     {
         if (path == null) throw new ArgumentNullException(nameof(path));
-        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 (fileSizeLimitBytes is < 1) throw new ArgumentException("Invalid value provided; file size limit must be at least 1 byte, or null.");
+        if (retainedFileCountLimit is < 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));
 
         _roller = new PathRoller(path, rollingInterval);
@@ -121,17 +121,22 @@ void OpenFile(DateTime now, int? minSequence = null)
         {
             if (Directory.Exists(_roller.LogFileDirectory))
             {
+                // ReSharper disable once ConvertClosureToMethodGroup
                 existingFiles = Directory.GetFiles(_roller.LogFileDirectory, _roller.DirectorySearchPattern)
-                                    .Select(f => Path.GetFileName(f));
+                    .Select(f => Path.GetFileName(f));
             }
         }
         catch (DirectoryNotFoundException) { }
 
         var latestForThisCheckpoint = _roller
             .SelectMatches(existingFiles)
             .Where(m => m.DateTime == currentCheckpoint)
+#if ENUMERABLE_MAXBY
+            .MaxBy(m => m.SequenceNumber);
+#else
             .OrderByDescending(m => m.SequenceNumber)
             .FirstOrDefault();
+#endif
 
         var sequence = latestForThisCheckpoint?.SequenceNumber;
         if (minSequence != null)
@@ -149,7 +154,7 @@ void OpenFile(DateTime now, int? minSequence = null)
             {
                 _currentFile = _shared ?
 #pragma warning disable 618
-                    (IFileSink)new SharedFileSink(path, _textFormatter, _fileSizeLimitBytes, _encoding) :
+                    new SharedFileSink(path, _textFormatter, _fileSizeLimitBytes, _encoding) :
 #pragma warning restore 618
                     new FileSink(path, _textFormatter, _fileSizeLimitBytes, _encoding, _buffered, _hooks);
 
@@ -180,6 +185,7 @@ void ApplyRetentionPolicy(string currentFilePath, DateTime now)
 
         // We consider the current file to exist, even if nothing's been written yet,
         // because files are only opened on response to an event being processed.
+        // ReSharper disable once ConvertClosureToMethodGroup
         var potentialMatches = Directory.GetFiles(_roller.LogFileDirectory, _roller.DirectorySearchPattern)
             .Select(f => Path.GetFileName(f))
             .Union(new[] { currentFileName });