具有 Singleton 属性的 Azure 函数中的 TaskCanceledException

Question

我在使用 Singleton 属性的 Azure 函数中遇到 TaskCanceledException。该异常似乎与单例功能有关。这是我的功能的相关部分：

[FunctionName("SampleSingletonFunction")]
        [Singleton]
        public async Task GenerateData([QueueTrigger("GenerateDataQueue")] string data,
            ILogger logger)
{
    try 
    {
       logger.LogTrace("Generate Data started.");
       
       var client = _httpClientFactory.CreateClient();
       var response = await client.GetAsync($"https://<url comes here>");
       if (response.IsSuccessStatusCode) 
       {
           logger.LogInformation("Success");
       }
       else 
       {
           logger.LogError("Failed");
       }
       logger.LogTrace("Generate Data completed.");
    }
    catch(Exception ex) 
    {
       logger.LogError(ex);
    }
}

创业班：

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        // Register the BlobServiceClient with dependency injection
        builder.Services.AddAzureClients(clientBuilder =>
        {
        clientBuilder.AddBlobServiceClient(Settings.StorageConnection);
        });
     }
}

主机.json

{
    "version": "2.0",
    "functionTimeout": "02:00:00",
    "durableTask": {
        "maxConcurrentActivityFunctions": 10,
        "maxConcurrentOrchestratorFunctions": 10
    },
    "logging": {
        "applicationInsights": {
            "samplingExcludedTypes": "Request",
            "samplingSettings": {
                "isEnabled": false
            }
        },
        "logLevel": {
            "Host.Triggers.DurableTask": "Information"
        }
    }
}

堆栈跟踪表明异常是从 Azure.Core.CancellationHelper.ThrowOperationCanceledException 引发的。该函数应该处理来自 Azure 队列的消息并更新一些静态数据表。

System.Threading.Tasks.TaskCanceledException:
   at Azure.Core.CancellationHelper.ThrowOperationCanceledException (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at Azure.Core.CancellationHelper.ThrowIfCancellationRequested (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at Azure.Core.Pipeline.ResponseBodyPolicy.ThrowIfCancellationRequestedOrTimeout (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at Azure.Core.Pipeline.ResponseBodyPolicy+<ProcessAsync>d__5.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.LoggingPolicy+<ProcessAsync>d__9.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.HttpPipelineSynchronousPolicy+<InnerProcessAsync>d__5.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.RedirectPolicy+<ProcessAsync>d__7.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.RetryPolicy+<ProcessAsync>d__5.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.Pipeline.RetryPolicy+<ProcessAsync>d__5.MoveNext (Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Core.HttpPipelineExtensions+<ProcessMessageAsync>d__0.MoveNext (Azure.Storage.Blobs, Version=12.19.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Threading.Tasks.ValueTask`1.get_Result (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Storage.Blobs.BlobRestClient+<GetPropertiesAsync>d__14.MoveNext (Azure.Storage.Blobs, Version=12.19.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Storage.Blobs.Specialized.BlobBaseClient+<GetPropertiesInternal>d__124.MoveNext (Azure.Storage.Blobs, Version=12.19.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Storage.Blobs.Specialized.BlobBaseClient+<GetPropertiesAsync>d__123.MoveNext (Azure.Storage.Blobs, Version=12.19.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.BlobLeaseDistributedLockManager+<ReadLeaseBlobMetadata>d__19.MoveNext (Microsoft.Azure.WebJobs.Host.Storage, Version=5.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host.Storage\Singleton\BlobLeaseDistributedLockManager.cs:337)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.BlobLeaseDistributedLockManager+<TryAcquireLeaseAsync>d__15.MoveNext (Microsoft.Azure.WebJobs.Host.Storage, Version=5.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host.Storage\Singleton\BlobLeaseDistributedLockManager.cs:175)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.BlobLeaseDistributedLockManager+<TryLockAsync>d__9.MoveNext (Microsoft.Azure.WebJobs.Host.Storage, Version=5.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host.Storage\Singleton\BlobLeaseDistributedLockManager.cs:83)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.SingletonManager+<TryLockAsync>d__19.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Singleton\SingletonManager.cs:125)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.SingletonManager+<LockAsync>d__18.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Singleton\SingletonManager.cs:99)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.SingletonLock+<AcquireAsync>d__26.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Singleton\SingletonLock.cs:82)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<ExecuteWithWatchersAsync>d__32.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:499)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<ExecuteWithLoggingAsync>d__26.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:306)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<ExecuteWithLoggingAsync>d__26.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:352)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+<TryExecuteAsync>d__18.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.41.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs:108)

包含的跟踪日志：

执行失败示例：

成功执行示例： 我尝试过的：

1. 检查单例配置：验证单例属性配置正确。
2. 超时设置：检查并调整了 host.json 文件中的超时设置。功能超时设置为2小时。
3. Blob 存储访问：验证访问 Azure Blob 存储的权限和连接。 尽管做出了这些努力，问题仍然存在。

问题：

1. 在 Singleton 属性的上下文中可能导致 TaskCanceledException 的原因是什么？
2. 是否有我可能缺少的将 Singleton 属性与 Azure Functions 结合使用的任何特定配置或最佳实践？
3. 如何有效调试并解决这个问题？

任何见解或建议将不胜感激！

Answer 1

我使用下面的代码在队列触发器Azure功能中实现单例。

SampleSingletonFunction.cs：

public class SampleSingletonFunction
{
    private readonly IHttpClientFactory _httpClientFactory;

    public SampleSingletonFunction(IHttpClientFactory httpClientFactory)
    {
        _httpClientFactory = httpClientFactory;
    }

    [FunctionName("SampleSingletonFunction")]
    [Singleton(Mode = SingletonMode.Listener)]
    public async Task GenerateData(
        [QueueTrigger("myqueue-items")] string data,
        ILogger logger)
    {
        try
        {
            logger.LogTrace("Generate Data started.");

            var client = _httpClientFactory.CreateClient();
            var response = await client.GetAsync($"https://google.com");
            if (response.IsSuccessStatusCode)
            {
                logger.LogInformation("Success");
            }
            else
            {
                logger.LogError("Failed");
            }
            logger.LogTrace("Generate Data completed.");
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "An error occurred while generating data.");
        }
    }
}

Startup.cs：

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        builder.Services.AddHttpClient();
    }
}

主机.json：

{
  "version": "2.0",
  "logging": {
    "applicationInsights": {
      "samplingSettings": {
        "isEnabled": true,
        "excludedTypes": "Request"
      },
      "enableLiveMetricsFilters": true
    },
    "logLevel": {
      "default": "None",
      "Function": "Trace"
    }
  },
  "singleton": {
    "enabled": true
  }
}

local.settings.json：

{
    "IsEncrypted": false,
    "Values": {
        "AzureWebJobsStorage": "<Storage_Connection_String>",
        "FUNCTIONS_INPROC_NET8_ENABLED": "1",
        "FUNCTIONS_WORKER_RUNTIME": "dotnet"
    }
}

输出：

Functions:

        SampleSingletonFunction: queueTrigger

For detailed output, run func with --verbose flag.
[2025-01-09T13:19:43.689Z] Host lock lease acquired by instance ID '000000000000000000000000F72731CC'.
[2025-01-09T13:20:35.579Z] Executing 'SampleSingletonFunction' (Reason='New queue message detected on 'myqueue-items'.', Id=af2fdccb-80d3-4796-99c3-a9c63ac726c3)
[2025-01-09T13:20:35.590Z] Trigger Details: MessageId: 369295b9-bbe0-44b1-af74-c2f4bf248a6d, DequeueCount: 1, InsertedOn: 2025-01-09T13:20:33.000+00:00
[2025-01-09T13:20:35.615Z] Generate Data started.
[2025-01-09T13:20:38.768Z] Success
[2025-01-09T13:20:38.771Z] Generate Data completed.
[2025-01-09T13:20:38.787Z] Executed 'SampleSingletonFunction' (Succeeded, Id=af2fdccb-80d3-4796-99c3-a9c63ac726c3, Duration=3304ms)

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