azure - 如何在 Azure Function 中写入 Azure 事件网格主题

Question

我注意到，主题突然不再作为服务总线的一部分提供。是否可以将消息写入 Azure 函数内的事件网格主题？

Answer 1

以下代码片段是使用 azure 函数将遥测流推送到事件模型的示例:

#r "Microsoft.ServiceBus"
#r "Newtonsoft.Json"


using System.Configuration;
using System.Text;
using System.Threading.Tasks;
using Microsoft.ServiceBus.Messaging;
using Newtonsoft.Json;

// reusable client proxy
static HttpClient client = HttpClientHelper.Client(ConfigurationManager.AppSettings["TopicEndpointEventGrid"], ConfigurationManager.AppSettings["aeg-sas-key"]);

// AF
public static async Task Run(EventData ed, TraceWriter log)
{
    log.Info($"C# Event Hub trigger function processed a message:{ed.SequenceNumber}"); 
    //foreach(var prop in ed.SystemProperties)
    //   log.Info($"{prop.Key} = {prop.Value}");

    // fire EventGrid Custom Topic
    var egevent = new 
    {
        Id = ed.SequenceNumber.ToString(),
        Subject = $"/iothub/events/{ed.SystemProperties["iothub-message-source"] ?? "?"}/{ed.SystemProperties["iothub-connection-device-id"] ?? "?"}",
        EventType = "telemetryDataInserted",
        EventTime = ed.EnqueuedTimeUtc,
        Data = new
        {
            sysproperties = ed.SystemProperties,
            properties = ed.Properties,
            body = JsonConvert.DeserializeObject(Encoding.UTF8.GetString(ed.GetBytes()))
        }
    };
    await client.PostAsJsonAsync("", new[] { egevent });  
}

// helper
class HttpClientHelper
{
    public static HttpClient Client(string address, string key)
    {      
        var client = new HttpClient() { BaseAddress = new Uri(address) };
        client.DefaultRequestHeaders.Add("aeg-sas-key", key);
        return client;      
    }
}

函数.json:

    {
      "bindings": [
       {
         "type": "eventHubTrigger",
         "name": "ed",
         "direction": "in",
         "path": "myIoTHubName",
         "connection": "connectionstringIOTHUB",
         "consumerGroup": "eventing",
         "cardinality": "many"
        }
      ],
      "disabled": false
    }

请注意，AEG 自定义主题的负载取决于其inputSchema 属性。基本上，当前的 AEG 版本(还包括预览版)允许从以下选择中声明输入模式:

• EventGridSchema(默认架构)
• CloudEventV01架构
• CustomEventSchema(仍在预览版中)

更多详情请参见:

• https://learn.microsoft.com/en-us/azure/event-grid/input-mappings
• https://learn.microsoft.com/en-us/azure/event-grid/cloudevents-schema