Azure Function：如何更好地实现重试队列消息的延迟

Question

我的 Azure 函数应该监听队列中的消息，然后获取消息，尝试调用外部服务并在消息中调用值，如果外部服务 returns "OK" 那么我们必须写入消息到另一个队列（对于下一个 Azure 函数），如果 returns "Fail" 我们必须 return 到我们当前的队列并在 5 分钟后再次通过我们的 Azure 函数重试。如何实施？我用 Timer 做到了，但解决方案不喜欢我：

    [FunctionName("FunctionOffice365VerificateDomain_and_AddService_and_GexMxRecord")]
    public async static Task Run([TimerTrigger("0 */5 * * * *")]TimerInfo myTimer,
        [Queue("domain-verificate-Office365-add-services-get-mx-record", Connection = "StorageConnectionString")]CloudQueue listenQueue,
        [Queue("domain-add-mx-record-to-registrator", Connection = "StorageConnectionString")]CloudQueue outputQueue,
        ILogger log)
    {
        while (true)
        {
            // do "invisible" message for next 30 sec
            var message = await listenQueue.GetMessageAsync();
            if (message != null)
            {
                DomainForRegistration domainForRegistration = JsonConvert.DeserializeObject<DomainForRegistration>(message.AsString);
                try
                {
                    await _office365DomainService.VerifyDomainAsync(domainForRegistration.DomainName);
                    // remove message
                    await listenQueue.DeleteMessageAsync(message);

                    await _office365DomainService.UpdateIndicateSupportedServicesDomainAsync(domainForRegistration.DomainName);

                    var mxRecord = await _office365DomainService.GetMxRecordForDomainAsync(domainForRegistration.DomainName);
                }
                catch (DomainVerificationRecordNotFoundException)
                {
                     // thrown when VerifyDomainAsync failed
                }
            }
            else
                break;
        }
    }

如果没有这些while(true)，但在验证失败后超时，如何更仔细地做？

Answer 1

同意@DavidG，尝试使用队列触发器来实现你的目标。 W可以依赖Queue的host setting。

visibilityTimeout is The time interval between retries when processing of a message fails maxDequeueCount is The number of times to try processing a message before moving it to the poison queue.

{
    "version": "2.0",
    "extensions": {
        "queues": {
            "visibilityTimeout" : "00:05:00",
            "maxDequeueCount": 2,
        }
    }
}

这样，函数应该是这样的

public static async Task Run(
    [QueueTrigger("domain-verificate-Office365-add-services-get-mx-record")]string myQueueItem, ILogger log,
    [Queue("domain-add-mx-record-to-registrator", Connection = "StorageConnectionString")]IAsyncCollector<string> outputQueue
)
{
    // do stuff then output message
    await outputQueue.AddAsync(myQueueItem);
}

如果不想抛异常给宿主机，可以转向initialVisibilityDelayCloudQueue方法

specifying the interval of time from now during which the message will be invisible

    public static async Task Run(
        [QueueTrigger("domain-verificate-Office365-add-services-get-mx-record")]string myQueueItem, ILogger log,
        [Queue("domain-add-mx-record-to-registrator", Connection = "StorageConnectionString")]IAsyncCollector<string> outputQueue,
        [Queue("domain-verificate-Office365-add-services-get-mx-record", Connection = "StorageConnectionString")]CloudQueue listenQueue
    )
    {

        try 
        {
            // do stuff then output message
            await outputQueue.AddAsync(myQueueItem);
        }
        catch(DomainVerificationRecordNotFoundException)
        {
            // add the message in current queue and can only be visible after 5 minutes
            await listenQueue.AddMessageAsync(new CloudQueueMessage(myQueueItem), null, TimeSpan.FromMinutes(5), null, null);
        }
    }

Azure Function：如何更好地实现重试队列消息的延迟

Azure Function : how to implement delay of retrying queue message better

c#

azure

azure-queues

azure-functions