c# - 如何优雅地使服务总线触发 Azure Functions 失败

Question

我想使用 Azure Functions 根据队列消息调用 REST 终结点。 Documentation告诉我...

The Functions runtime receives a message in PeekLock mode and calls Complete on the message if the function finishes successfully, or calls Abandon if the function fails.

因此，当 REST 调用失败时，我尝试通过引发主机放弃消息的异常来使该函数失败。

using System;
using System.Text;
using System.Threading.Tasks;
using Microsoft.ServiceBus.Messaging;

public static void Run(BrokeredMessage message, TraceWriter log)
{
    string body = message.GetBody<string>();

    using (var client = new HttpClient())
    {
        var content = new StringContent(body, Encoding.UTF8, "application/json");
        var response = client.PutAsync("http://some-rest-endpoint.url/api", content).Result;
        if (!response.IsSuccessStatusCode)
        {
            throw new Exception("Message could not be sent");
        }
    }    
}

有人知道更好的方法来优雅地失败该函数吗？

Answer 1

记录失败并手动调用message.Abandon()

public static async Task RunAsync(BrokeredMessage message, TraceWriter log) {
    var body = message.GetBody<string>();

    using (var client = new HttpClient()) {
        var content = new StringContent(body, Encoding.UTF8, "application/json");
        var response = await client.PutAsync("http://some-rest-endpoint.url/api", content);
        if (!response.IsSuccessStatusCode) {
            log.Warning("Message could not be sent");
            await message.AbandonAsync();
        }
    }    
}