如何在异步Azure函数HTTP触发的函数中捕获Azure表的异常引发 [英] How to catch an Exception throw by Azure Table in an async Azure Function HTTP Triggered function
问题描述
我有一个Azure函数HTTP触发的函数,该函数写入可能以重复条目结尾的Azure表.我注意到,即使我尝试/捕获了整个函数,仍然会向函数运行器泄漏"异常,从而返回HTTP500.是否有任何方法可以捕获这种异常?
I have an Azure Function HTTP triggered function which writes to Azure Table that may end in duplicated entries. I noticed that even if I try/catch'd the whole function, there will still be an Exception "leaked" to the function runner thus returning HTTP 500. Is there any way to catch this kind of exception?
下面是代码的缩小版本:
Here's a minified version of the code:
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.WindowsAzure.Storage;
namespace FunctionTest
{
public class Entry
{
public string PartitionKey { get; set; }
public string RowKey { get; set; }
}
public static class Debug
{
[FunctionName("Debug")]
public static async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]
HttpRequest req,
[Table("Debug")]
IAsyncCollector<Entry> tableBinding,
ILogger log)
{
try
{
await tableBinding.AddAsync(new Entry()
{
PartitionKey = "1111",
RowKey = "1111",
});
await tableBinding.FlushAsync();
}
catch (StorageException)
{
// we expect an Exception "The specified entity already exists"
return new OkObjectResult("This passes test");
}
return new OkObjectResult("This passes test too");
}
}
}
代码是在Azure Function运行时2.0(.NET Core之一)下编写的.
The code is written under Azure Function runtime 2.0 (the .NET Core one).
触发/api/debug
两次或更多次,您将看到:
Trigger /api/debug
twice or more and you will see:
- HTTP 500
- 输入了
catch {}
代码,但仍返回HTTP 500(!) - 在Application Insights中,每个请求有两个表依赖项调用(应该不会发生,文档说表没有自动重试)
- HTTP 500
- The
catch{}
code is entered, and still returns an HTTP 500(!) - In Application Insights, two table dependency call per request (shouldn't happen, the documentation says table do not have auto retry)
推荐答案
我猜想,使用 IAsyncCollector<>
会破坏这里的内容.如果要避免此类问题,请尝试交换以下绑定:
I guess, that using IAsyncCollector<>
breaks things here. If you want to avoid such problems, try to exchange the following binding:
[Table("Debug")] IAsyncCollector<Entry> tableBinding
收件人:
[Table("Debug")] CloudTable tableBinding
然后,使用以下代码段代替使用 tableBinding.AddAsync()
:
Then, instead of using tableBinding.AddAsync()
use the following snippet:
var op = TableOperation.Insert(new Entry());
await tableBinding.ExecuteAsync(op);
使用这种方法,您应该能够捕获异常,而不会将其泄漏到Function运行时.
With that approach, you should be able to catch the exception, without leaking it to the Functions runtime.
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