用于写入队列的 Azure 函数 - 我可以设置元数据吗? [英] Azure Function used to write to queue - can I set metadata?

问题描述

我可以从 这个页面看到 当它们用作触发器时，您可以简单地访问队列消息元数据属性，但我想做相反的事情.我有一个将消息写入队列的 Azure 函数，但它当前具有默认的过期时间，我想设置一个更短的过期时间，以便它们只在队列中存活很短的时间.

I can see from this page that you can access a queue message metadata properties simply enough when they are used as a trigger, but I want to do the opposite. I have an Azure function which writes messages to a queue, but it current has the default Expiration Time and I want to set a much shorter expiration time so they only live on the queue for a very short period.

有没有办法在将消息从 Azure Function 写入队列时设置过期时间?

Is there a way when writing the message to the queue from the Azure Function to set the Expiration time?

谢谢

编辑 1:一个警告是我不提前知道队列的名称.那是传入消息的一部分，因此将 queuename 设置为输出绑定的参数我按照@Mikhail 的建议进行了更改.这是它的功能:

EDIT 1: One caveat is that I dont know the name of the queue ahead of time. That is part of the incoming message, so the queuename is set as a parameter of the output binding I made the change as recommended by @Mikhail. Here is the function as it stands:

#r "Microsoft.WindowsAzure.Storage"
#r "Newtonsoft.Json"

using System;
using Microsoft.WindowsAzure.Storage.Queue;
using Newtonsoft.Json;

public static void Run(MyType myEventHubMessage, CloudQueue outputQueue, TraceWriter log)
{
    var deviceId = myEventHubMessage.DeviceId;
    var data = JsonConvert.SerializeObject(myEventHubMessage);
    var msg = new CloudQueueMessage(data);
    log.Info($"C# Event Hub trigger function processed a message: {deviceId}");
    outputQueue.AddMessage(msg, TimeSpan.FromMinutes(3), null, null, null);

}

public class MyType
{
  public string DeviceId { get; set; }
  public double Field1{ get; set; }
  public double Field2 { get; set; }
  public double Field3 { get; set; }
}

以及我的function.json中的输出绑定:

And the output binding in my function.json:

{
"type": "CloudQueue",
"name": "$return",
"queueName": "{DeviceId}",
"connection": "myConn",
"direction": "out"
}

推荐答案

将参数类型改为CloudQueue，然后手动添加消息并设置过期时间属性(或者更确切地说是生存时间).

Change the type of your parameter to CloudQueue, then add a message manually and set the expiration time property (or rather Time To Live).

public static void Run(string input, CloudQueue outputQueue)
{
    outputQueue.AddMessage(
        new CloudQueueMessage("Hello " + input),
        TimeSpan.FromMinutes(5));
}

如果您的输出队列名称取决于请求，您可以使用命令式绑定:

if your output queue name depends on request, you can use imperative binding:

public static void Run(string input, IBinder binder)
{
    string outputQueueName = "outputqueue " + input;
    QueueAttribute queueAttribute = new QueueAttribute(outputQueueName);
    CloudQueue outputQueue = binder.Bind<CloudQueue>(queueAttribute);
    outputQueue.AddMessage(
        new CloudQueueMessage("Hello " + input),
        TimeSpan.FromMinutes(5));
}

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