Add support for .NET 8 (App-vNext#1144)

- Add `net8.0` targets.
- Use .NET `TimeProvider` implementation.
- Use `FakeTimeProvider` for tests.
- Use new .NET 8 APIs where relevant.

Co-Authored-By: martintmk <103487740+martintmk@users.noreply.github.com>

Author: martincostello

Directory.Packages.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <MicrosoftExtensionsVersion>7.0.0</MicrosoftExtensionsVersion>
+    <MicrosoftExtensionsVersion>8.0.0</MicrosoftExtensionsVersion>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <PollyVersion>8.1.0</PollyVersion>
   </PropertyGroup>
@@ -10,6 +10,7 @@
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
     <PackageVersion Include="GitHubActionsTestLogger" Version="2.3.3" />
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="6.0.0" />
+    <PackageVersion Include="Microsoft.Bcl.TimeProvider" Version="$(MicrosoftExtensionsVersion)" />
     <PackageVersion Include="Microsoft.CodeAnalysis.BannedApiAnalyzers" Version="3.3.4" />
     <PackageVersion Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="3.3.4" />
     <PackageVersion Include="Microsoft.Extensions.Caching.Memory" Version="$(MicrosoftExtensionsVersion)" />
@@ -20,6 +21,7 @@
     <PackageVersion Include="Microsoft.Extensions.Logging.Console" Version="$(MicrosoftExtensionsVersion)" />
     <PackageVersion Include="Microsoft.Extensions.Options" Version="$(MicrosoftExtensionsVersion)" />
     <PackageVersion Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="$(MicrosoftExtensionsVersion)" />
+    <PackageVersion Include="Microsoft.Extensions.TimeProvider.Testing" Version="8.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
     <PackageVersion Include="MinVer" Version="4.3.0" />
@@ -41,12 +43,4 @@
     <PackageVersion Include="xunit" Version="2.6.1" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.3" />
   </ItemGroup>
-  <ItemGroup Condition="$(TargetFramework) == 'net6.0'">
-    <PackageVersion Update="Microsoft.Extensions.Options" Version="6.0.0" />
-    <PackageVersion Update="Microsoft.Extensions.Logging.Abstractions" Version="6.0.0" />
-  </ItemGroup>
-  <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible($(TargetFramework), 'netcoreapp3.1'))">
-    <PackageVersion Update="Microsoft.Extensions.Options" Version="2.2.0" />
-    <PackageVersion Update="Microsoft.Extensions.Logging.Abstractions" Version="6.0.0" />
-  </ItemGroup>
 </Project>

bench/Polly.Benchmarks/Polly.Benchmarks.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <IsPackable>false</IsPackable>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
     <Nullable>enable</Nullable>
     <ProjectType>Benchmark</ProjectType>
     <NoWarn>$(NoWarn);CA1822;SA1414;IDE0060</NoWarn>

bench/Polly.Core.Benchmarks/Polly.Core.Benchmarks.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net7.0</TargetFrameworks>
+    <TargetFrameworks>net8.0;net7.0</TargetFrameworks>
     <RootNamespace>Polly</RootNamespace>
     <ImplicitUsings>true</ImplicitUsings>
     <ProjectType>Benchmark</ProjectType>

eng/Library.targets

@@ -14,6 +14,7 @@
 
   <PropertyGroup Label="NuGet package validation">
     <EnablePackageValidation Condition="'$(EnablePackageValidation)' == ''">true</EnablePackageValidation>
+    <!-- TODO Bump to 8.2.0 once published to NuGet.org -->
     <PackageValidationBaselineVersion Condition="'$(PackageValidationBaselineVersion)' == ''">8.1.0</PackageValidationBaselineVersion>
   </PropertyGroup>
 

src/Polly.Core/CircuitBreaker/Controller/CircuitStateController.cs

@@ -254,10 +254,14 @@ private static bool IsDateTimeOverflow(DateTimeOffset utcNow, TimeSpan breakDura
 
     private void EnsureNotDisposed()
     {
+#if NET8_0_OR_GREATER
+        ObjectDisposedException.ThrowIf(_disposed, this);
+#else
         if (_disposed)
         {
             throw new ObjectDisposedException(nameof(CircuitStateController<T>));
         }
+#endif
     }
 
     private void CloseCircuit_NeedsLock(Outcome<T> outcome, bool manual, ResilienceContext context, out Task? scheduledTask)

src/Polly.Core/CircuitBreaker/Controller/ScheduledTaskExecutor.cs

@@ -17,10 +17,14 @@ internal sealed class ScheduledTaskExecutor : IDisposable
 
     public void ScheduleTask(Func<Task> taskFactory, ResilienceContext context, out Task task)
     {
+#if NET8_0_OR_GREATER
+        ObjectDisposedException.ThrowIf(_disposed, this);
+#else
         if (_disposed)
         {
             throw new ObjectDisposedException(nameof(ScheduledTaskExecutor));
         }
+#endif
 
         var source = new TaskCompletionSource<object>();
         task = source.Task;

src/Polly.Core/Hedging/Controller/HedgingExecutionContext.cs

@@ -122,7 +122,11 @@ public async ValueTask DisposeAsync()
 
         using var delayTaskCancellation = CancellationTokenSource.CreateLinkedTokenSource(PrimaryContext!.CancellationToken);
 
+#if NET8_0_OR_GREATER
+        var delayTask = Task.Delay(hedgingDelay, _timeProvider, delayTaskCancellation.Token);
+#else
         var delayTask = _timeProvider.Delay(hedgingDelay, delayTaskCancellation.Token);
+#endif
         Task<Task> whenAnyHedgedTask = WaitForTaskCompetitionAsync();
         var completedTask = await Task.WhenAny(whenAnyHedgedTask, delayTask).ConfigureAwait(ContinueOnCapturedContext);
 
@@ -133,7 +137,11 @@ public async ValueTask DisposeAsync()
 
         // cancel the ongoing delay task
         // Stryker disable once boolean : no means to test this
+#if NET8_0_OR_GREATER
+        await delayTaskCancellation.CancelAsync().ConfigureAwait(ContinueOnCapturedContext);
+#else
         delayTaskCancellation.Cancel(throwOnFirstException: false);
+#endif
 
         await whenAnyHedgedTask.ConfigureAwait(ContinueOnCapturedContext);
 

src/Polly.Core/Polly.Core.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;netstandard2.0;net472;net462</TargetFrameworks>
+    <TargetFrameworks>net8.0;net6.0;netstandard2.0;net472;net462</TargetFrameworks>
     <AssemblyTitle>Polly.Core</AssemblyTitle>
     <RootNamespace>Polly</RootNamespace>
     <Nullable>enable</Nullable>
@@ -29,6 +29,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Condition="!$([MSBuild]::IsTargetFrameworkCompatible($(TargetFramework), 'netcoreapp3.1'))" />
+    <PackageReference Include="Microsoft.Bcl.TimeProvider" Condition="!$([MSBuild]::IsTargetFrameworkCompatible($(TargetFramework), 'net8.0'))" />
     <PackageReference Include="System.Threading.Tasks.Extensions" Condition="!$([MSBuild]::IsTargetFrameworkCompatible($(TargetFramework), 'netcoreapp3.1'))" />
     <PackageReference Include="System.ValueTuple" Condition="$([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) == '.NETFramework'" />
     <PackageReference Include="System.ComponentModel.Annotations" Condition="!$([MSBuild]::IsTargetFrameworkCompatible($(TargetFramework), 'netcoreapp3.1'))" />

src/Polly.Core/PublicAPI.Unshipped.txt

@@ -7,3 +7,6 @@ Polly.CircuitBreaker.BreakDurationGeneratorArguments.FailureCount.get -> int
 Polly.CircuitBreaker.BreakDurationGeneratorArguments.FailureRate.get -> double
 Polly.CircuitBreaker.CircuitBreakerStrategyOptions<TResult>.BreakDurationGenerator.get -> System.Func<Polly.CircuitBreaker.BreakDurationGeneratorArguments, System.Threading.Tasks.ValueTask<System.TimeSpan>>?
 Polly.CircuitBreaker.CircuitBreakerStrategyOptions<TResult>.BreakDurationGenerator.set -> void
+Polly.ResiliencePipelineBuilderBase.TimeProvider.get -> System.TimeProvider?
+Polly.ResiliencePipelineBuilderBase.TimeProvider.set -> void
+Polly.StrategyBuilderContext.TimeProvider.get -> System.TimeProvider!

src/Polly.Core/Registry/RegistryPipelineComponentBuilder.cs

@@ -59,7 +59,7 @@ private Builder CreateBuilder()
         builder.InstanceName = _instanceName;
         _configure(builder, context);
 
-        var timeProvider = builder.TimeProvider;
+        var timeProvider = builder.TimeProviderInternal;
         var telemetry = new ResilienceStrategyTelemetry(
             new ResilienceTelemetrySource(builder.Name, builder.InstanceName, null),
             builder.TelemetryListener);