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Fix warning CA1062#AsyncFallbackPolicy #2233

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merged 1 commit into from
Jul 23, 2024
Merged

Fix warning CA1062#AsyncFallbackPolicy #2233

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17 changes: 13 additions & 4 deletions src/Polly/Fallback/AsyncFallbackPolicy.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,6 @@ namespace Polly.Fallback;
/// <summary>
/// A fallback policy that can be applied to asynchronous delegates.
/// </summary>
#pragma warning disable CA1062 // Validate arguments of public methods
public class AsyncFallbackPolicy : AsyncPolicy, IFallbackPolicy
{
private readonly Func<Exception, Context, Task> _onFallbackAsync;
Expand Down Expand Up @@ -72,9 +71,18 @@ internal AsyncFallbackPolicy(

/// <inheritdoc/>
[DebuggerStepThrough]
protected override Task<TResult> ImplementationAsync(Func<Context, CancellationToken, Task<TResult>> action, Context context, CancellationToken cancellationToken,
bool continueOnCapturedContext) =>
AsyncFallbackEngine.ImplementationAsync(
protected override Task<TResult> ImplementationAsync(
Func<Context, CancellationToken, Task<TResult>> action,
Context context,
CancellationToken cancellationToken,
bool continueOnCapturedContext)
{
if (action is null)
{
throw new ArgumentNullException(nameof(action));
}

return AsyncFallbackEngine.ImplementationAsync(
action,
context,
ExceptionPredicates,
Expand All @@ -83,4 +91,5 @@ protected override Task<TResult> ImplementationAsync(Func<Context, CancellationT
_fallbackAction,
continueOnCapturedContext,
cancellationToken);
}
}
27 changes: 27 additions & 0 deletions test/Polly.Specs/Fallback/FallbackTResultAsyncSpecs.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,33 @@ public class FallbackTResultAsyncSpecs
{
#region Configuration guard condition tests

[Fact]
public void Should_throw_when_action_is_null()
{
var flags = BindingFlags.NonPublic | BindingFlags.Instance;
Func<Context, CancellationToken, Task<EmptyStruct>> action = null!;
PolicyBuilder<EmptyStruct> policyBuilder = new PolicyBuilder<EmptyStruct>(exception => exception);
Func<DelegateResult<EmptyStruct>, Context, Task> onFallbackAsync = (_, _) => Task.CompletedTask;
Func<DelegateResult<EmptyStruct>, Context, CancellationToken, Task<EmptyStruct>> fallbackAction = (_, _, _) => Task.FromResult(EmptyStruct.Instance);

var instance = Activator.CreateInstance(
typeof(AsyncFallbackPolicy<EmptyStruct>),
flags,
null,
[policyBuilder, onFallbackAsync, fallbackAction],
null)!;
var instanceType = instance.GetType();
var methods = instanceType.GetMethods(flags);
var methodInfo = methods.First(method => method is { Name: "ImplementationAsync", ReturnType.Name: "Task`1" });

var func = () => methodInfo.Invoke(instance, [action, new Context(), CancellationToken.None, false]);

var exceptionAssertions = func.Should().Throw<TargetInvocationException>();
exceptionAssertions.And.Message.Should().Be("Exception has been thrown by the target of an invocation.");
exceptionAssertions.And.InnerException.Should().BeOfType<ArgumentNullException>()
.Which.ParamName.Should().Be("action");
}

[Fact]
public void Should_throw_when_fallback_action_is_null()
{
Expand Down