从 PowerShell cmdlet 创建 Azure Blob 容器失败

Question

我有一小段 C# 代码可以在通过控制台模式可执行文件运行时创建 Azure Blob 容器，但当相同的代码是 PowerShell cmdlet 的一部分（也在 C# 中）时会失败。失败模式真的很奇怪：它创建了容器，然后在出错之前不断重试几分钟。没看懂。

使用 .NET Framework 4.8 和 Azure.Storage.Blobs v12.4.1 在 Visual Studio 中构建的代码：

using System.Management.Automation;
using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;

namespace BlobTest.Commands
{
    [Cmdlet(VerbsData.Initialize, "AzContainer")]
    public class Initialize_AzContainer : Cmdlet
    {
        protected override void ProcessRecord()
        {
            base.ProcessRecord();

            const string AzStorageAccount = "stevestorageaccount";
            const string AzAccessKey = "*****==";

            string connectionString = $"DefaultEndpointsProtocol=http" // http intentional: for wireshark
                                      + $";AccountName={AzStorageAccount}"
                                      + $";AccountKey={AzAccessKey}"
                                      + ";EndpointSuffix=core.windows.net";

            const string containerName = "my-test-container-2";

            var bsclient = new BlobServiceClient(connectionString);

            WriteVerbose($"Creating container {containerName}");
            var rc = bsclient.CreateBlobContainer(containerName, PublicAccessType.None);

            WriteVerbose($"Result = {rc}");
        }
    }
}

这会在呕吐前挂起几分钟：

PS> Import-Module .\BlobTest.Commands.dll
PS> Initialize-AzContainer -Verbose
VERBOSE: Creating container my-test-container-2

[hung out for 7 minutes]

Initialize-AzContainer : Retry failed after 6 tries.
At line:1 char:1
+ Initialize-AzContainer -Verbose
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Initialize-AzContainer], AggregateException
    + FullyQualifiedErrorId : System.AggregateException,BlobTest.Commands.Initialize_AzContainer

我在进行故障排除时故意使用不安全的 http，以便我可以嗅探对话，而 Wireshark 表现出非常奇怪的行为。痕迹中的// 是我的笔记，不是痕迹的一部分：

// MY END SENDS: this looks normal
PUT /my-test-container-2?restype=container HTTP/1.1
x-ms-version: 2019-07-07
x-ms-client-request-id: acc4991b-33ab-4764-9f20-a33edb5cc4a3
x-ms-return-client-request-id: true
User-Agent: azsdk-net-Storage.Blobs/12.4.1 (.NET Framework 4.8.4150.0; Microsoft Windows 10.0.18363 )
x-ms-date: Wed, 29 Apr 2020 17:42:27 GMT
Authorization: SharedKey <secret key info>
Host: stevestorageaccount.blob.core.windows.net
Content-Length: 0

// AZURE REPLIES: all ok!
HTTP/1.1 201 Created
Content-Length: 0
Last-Modified: Wed, 29 Apr 2020 17:42:28 GMT
ETag: "0x8D7EC64AF7BD68A"
Server: Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0
x-ms-request-id: 5ebb740e-201e-001a-354d-1e15bd000000
x-ms-client-request-id: acc4991b-33ab-4764-9f20-a33edb5cc4a3
x-ms-version: 2019-07-07
Date: Wed, 29 Apr 2020 17:42:27 GMT

// MY END TRIES AGAIN - huh?
PUT /my-test-container-2?restype=container HTTP/1.1
x-ms-version: 2019-07-07
x-ms-client-request-id: acc4991b-33ab-4764-9f20-a33edb5cc4a3
x-ms-return-client-request-id: true
User-Agent: azsdk-net-Storage.Blobs/12.4.1 (.NET Framework 4.8.4150.0; Microsoft Windows 10.0.18363 )
x-ms-date: Wed, 29 Apr 2020 17:42:29 GMT
Authorization: SharedKey <secret key info>
Host: stevestorageaccount.blob.core.windows.net
Content-Length: 0

// AZURE REPLIES: sorry already exists
HTTP/1.1 409 The specified container already exists.
Content-Length: 230
Content-Type: application/xml
Server: Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0
x-ms-request-id: 5ebb7805-201e-001a-224d-1e15bd000000
x-ms-client-request-id: acc4991b-33ab-4764-9f20-a33edb5cc4a3
x-ms-version: 2019-07-07
x-ms-error-code: ContainerAlreadyExists
Date: Wed, 29 Apr 2020 17:42:29 GMT
...<?xml version="1.0" encoding="utf-8"?>
<Error>
<Code>ContainerAlreadyExists</Code>
<Message>The specified container already exists.
RequestId:5ebb7805-201e-001a-224d-1e15bd000000
Time:2020-04-29T17:42:29.6128339Z</Message></Error>

(repeats a few times)

相同的代码在控制台模式的可执行文件中运行良好，无论我使用async 还是如上所述的常规同步，它的行为方式都相同。我尝试了各种其他组合，添加取消令牌等，但没有任何影响。

注意：我知道如何使用本机 Azure cmdlet 创建容器，但以上是附加处理的一部分，所以我试图找出故障的根源，而不是找到其他方法来创建容器.

我在这方面花了好几个小时，不知道发生了什么。

编辑：我已经尝试重新启动我的系统，没有任何区别，这就是 Windows 10 上的 PowerShell 5.1.18362.752 以及所有最新更新。

Answer 1

这里似乎触发了retry policy。但奇怪的是，在控制台项目中，运行成功是不会重试的。

作为一种解决方法，您可以在您的代码中设置重试策略，示例代码如下：

[Cmdlet(VerbsData.Initialize, "AzContainer")]
public class Initialize_AzContainer : Cmdlet
{
    protected override void ProcessRecord()
    {
        base.ProcessRecord();

       //other code

       //set the retry policy here
        var options = new BlobClientOptions();
        options.Retry.MaxRetries = 0;

        var bsclient = new BlobServiceClient(connectionString, options);

        WriteVerbose($"Creating container {containerName}");

        var rc = bsclient.CreateBlobContainer(containerName, PublicAccessType.None);
        WriteVerbose($"Result = {rc}");


    }

}