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AsyncPredicateValidator.cs
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/
AsyncPredicateValidator.cs
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#region License
// Copyright (c) .NET Foundation and contributors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// The latest version of this file can be found at https://github.com/FluentValidation/FluentValidation
#endregion
namespace ServiceStack.FluentValidation.Validators {
using System;
using System.Threading;
using System.Threading.Tasks;
using FluentValidation.Internal;
using FluentValidation.Resources;
/// <summary>
/// Asynchronous custom validator
/// </summary>
public class AsyncPredicateValidator : PropertyValidator {
private readonly Func<object, object, PropertyValidatorContext, CancellationToken, Task<bool>> _predicate;
/// <summary>
/// Creates a new AsyncPredicateValidator
/// </summary>
/// <param name="predicate"></param>
public AsyncPredicateValidator(Func<object, object, PropertyValidatorContext, CancellationToken, Task<bool>> predicate) {
predicate.Guard("A predicate must be specified.", nameof(predicate));
this._predicate = predicate;
}
protected override Task<bool> IsValidAsync(PropertyValidatorContext context, CancellationToken cancellation) {
return _predicate(context.InstanceToValidate, context.PropertyValue, context, cancellation);
}
protected override bool IsValid(PropertyValidatorContext context) {
//TODO: For FV 9, throw an exception by default if async validator is being executed synchronously.
return Task.Run(() => IsValidAsync(context, new CancellationToken())).GetAwaiter().GetResult();
}
public override bool ShouldValidateAsynchronously(IValidationContext context) {
return context.IsAsync() || base.ShouldValidateAsynchronously(context);
}
protected override string GetDefaultMessageTemplate() {
return Localized(nameof(AsyncPredicateValidator));
}
}
}