为什么 RegisterMessageHandler 不适用于特定主题名称？

Question

我不明白为什么下面引用的以下处理程序（processMessageAsync）没有针对特定主题名称触发，但针对其他主题名称触发：

subscriptionClient.RegisterMessageHandler(processMessageAsync, msgOptions)

以下是我的订阅者类：

open System
open System.Linq
open System.Threading
open System.Text
open System.Threading.Tasks
open Microsoft.Azure.ServiceBus

type Subscriber(connectionString:string, topic:string, subscription:string) =

    let mutable subscriptionClient : SubscriptionClient = null

    let exceptionReceivedHandler (args:ExceptionReceivedEventArgs) =
        printfn "Got an exception: %A" args.Exception
        Task.CompletedTask

    let processMessageAsync (message:Message) (_:CancellationToken) = 

        try

            let _ = Encoding.UTF8.GetString(message.Body)
            subscriptionClient.CompleteAsync(message.SystemProperties.LockToken) |> Async.AwaitTask |> Async.RunSynchronously

            Task.CompletedTask

        with
            _ -> Task.CompletedTask

    member x.Listen() =

        async {

            subscriptionClient <- new SubscriptionClient(connectionString, topic, subscription)
            subscriptionClient.OperationTimeout <- TimeSpan.FromMinutes(3.0)

            let! rulesFound     = subscriptionClient.GetRulesAsync() |> Async.AwaitTask
            let  hasDefaultRule = rulesFound.Any(fun r -> r.Name = RuleDescription.DefaultRuleName)

            if hasDefaultRule then
                do! subscriptionClient.RemoveRuleAsync(RuleDescription.DefaultRuleName) |> Async.AwaitTask

            let msgOptions = MessageHandlerOptions(fun args -> exceptionReceivedHandler(args))
            msgOptions.AutoComplete         <- false
            msgOptions.MaxAutoRenewDuration <- TimeSpan.FromMinutes(1.0)
            msgOptions.MaxConcurrentCalls   <- 1

            subscriptionClient.RegisterMessageHandler(processMessageAsync, msgOptions)
        }

    member x.CloseAsync() =

        async {

            do! subscriptionClient.CloseAsync() |> Async.AwaitTask
        }

这是我尝试运行订阅者的方式：

open System
open Subscription.Console

let connectionString = <connection_string>

[<EntryPoint>]
let main argv =

    printfn "Welcome to Subscription.Console"

    let topic,subscription = "Topic.courier-accepted","Subscription.all-messages"
    let subscriber = Subscriber(connectionString, topic, subscription)

    async { do! subscriber.Listen()
          } |> Async.RunSynchronously

    Console.ReadKey() |> ignore

    async { do! subscriber.CloseAsync()
          } |> Async.RunSynchronously

    0 // return an integer exit code 

以下代码发布了我的订阅者应该收到（但没有）的消息：

[<Fact>]
let ``Publish courier-accepted to servicebus``() =

    async {

        // Setup
        let  client    = TopicClient(sbConnectionstring, "Topic.courier-accepted")
        let! requestId = requestId()

        let updated = requestId |> modifyRequestId someCourierResponse
        let json    = JsonConvert.SerializeObject(updated)
        let message = Message(Encoding.UTF8.GetBytes(json))

        message.Label <- sprintf "request-id(%s)" (requestId.ToString())

        // Test
        do! client.SendAsync(message) |> Async.AwaitTask

        // Teardown
        do! client.CloseAsync()       |> Async.AwaitTask
    }

笔记：

上面代码的有趣之处在于，当我有一个 Azure 函数在 ServiceBusTrigger 设置为相同的主题和订阅名称的情况下运行时，每次运行测试时都会触发该 Azure 函数。

• 我没有收到任何异常消息
• 我的 Subscriber 实例永远不会触发exceptionReceivedHandler函数
• 我在 Azure 仪表板上没有观察到 servicebus 资源的任何用户错误

使用不同的主题名称成功

如果我将主题名称更改为“courier-requested”，那么订阅者实例会收到消息：

[<Fact>]
let ``Publish courier-requested to servicebus topic``() =

    // Setup
    let client    = TopicClient(sbConnectionstring, "Topic.courier-requested")
    let message   = Message(Encoding.UTF8.GetBytes(JsonFor.courierRequest))
    message.Label <- sprintf "courier-id(%s)" "b965f552-31a4-4644-a9c6-d86dd45314c4"

    // Test
    async {

        do! client.SendAsync(message) |> Async.AwaitTask
        do! client.CloseAsync()       |> Async.AwaitTask
    }

这是主题名称调整的订阅：

[<EntryPoint>]
let main argv =

    printfn "Welcome to Subscription.Console"

    let topic,subscription = "Topic.courier-requested","Subscription.all-messages"
    let subscriber = Subscriber(connectionString, topic, subscription)

    async { do! subscriber.Listen()
          } |> Async.RunSynchronously

    Console.ReadKey() |> ignore

    async { do! subscriber.CloseAsync()
          } |> Async.RunSynchronously

    0 // return an integer exit code

以下是我的 Azure 门户中的两个主题：

在 Portal 中点击主题有不同的结果：

我注意到我必须点击“快递接受”两次才能查看它的订阅。但是，我可以单击“快递请求”一次并立即查看其订阅。

Answer 1

如果我正确理解您尝试删除有问题的主题并重新创建它，那么对我来说这听起来像是 Azure 中的一个小问题。您不应该出现上述需要单击两次的行为。有时，我在 Azure 中创建了一些东西，但其基础设施下游某个地方出现了问题，而支持请求是解决问题的唯一方法。