在Azure函数中是否存在(或即将有)一个ResponseCache等效？

Question

在Azure函数中是否存在与ASP.NET核心ResponseCache属性等价的内容。我希望我的函数添加一个缓存控制头。

与ASP.NET核心类似：

https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.responsecacheattribute?view=aspnetcore-5.0

或者有一个与Azure函数V3兼容的解决方案？

谢谢。

Answer 1

如果您想在Azure函数中实现响应缓存，我们可以使用arrtibute FunctionInvocationFilterAttribute来实现它。

例如

实现ResponseCacheAttribute的

 class FunctionResponseCacheAttribute : FunctionInvocationFilterAttribute
    {
        private readonly int _duration;
        private readonly ResponseCacheLocation _cacheLocation;
        public FunctionResponseCacheAttribute(
            int duration,
            ResponseCacheLocation cacheLocation)
        {
            _duration = duration;
            _cacheLocation = cacheLocation;
        }
        public override async Task OnExecutedAsync(
            FunctionExecutedContext executedContext,
            CancellationToken cancellationToken)
        {
            if (!(executedContext.Arguments.First().Value is HttpRequest request))
                throw new ApplicationException(
                    "HttpRequest is null. ModelBinding is not supported, " +
                    "please use HttpRequest as input parameter and deserialize " +
                    "using helper functions.");
            var headers = request.HttpContext.Response.GetTypedHeaders();
            var cacheLocation = executedContext.FunctionResult?.Exception == null
                ? _cacheLocation
                : ResponseCacheLocation.None;
            switch (cacheLocation)
            {
                case ResponseCacheLocation.Any:
                    headers.CacheControl = new CacheControlHeaderValue()
                    {
                        MaxAge = TimeSpan.FromSeconds(_duration),
                        NoStore = false,
                        Public = true
                    };
                    break;
                case ResponseCacheLocation.Client:
                    headers.CacheControl = new CacheControlHeaderValue()
                    {
                        MaxAge = TimeSpan.FromSeconds(_duration),
                        NoStore = false,
                        Public = true
                    };
                    break;
                case ResponseCacheLocation.None:
                    headers.CacheControl = new CacheControlHeaderValue()
                    {
                        MaxAge = TimeSpan.Zero,
                        NoStore = true
                    };
                    break;
                default:
                    throw new ArgumentOutOfRangeException();
            }
            await base.OnExecutedAsync(executedContext, cancellationToken);
        }
    }

1. Usage

[FunctionName("Function1")]
        [FunctionResponseCache(60 * 60, ResponseCacheLocation.Any)]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
        }

​

​

根据情况更新，我认为您可以在函数中添加以下代码来实现它

 [FunctionName("Function1")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

...
            var resHeaders = req.HttpContext.Response.GetTypedHeaders();
            resHeaders.CacheControl = new CacheControlHeaderValue()
            {
                MaxAge = TimeSpan.FromSeconds(3600),
                NoStore = false,
                Public = true
            };
 ...
        }