如何解决EventHub Azure 函数正确触发,但 EventData.Body 为 0 字节
我正在编写一个 EventHub 发布者(控制台应用程序)和一个 C# Azure 函数,它将作为消费者工作。当我运行客户端时,我可以看到函数被触发,但它在 eventData.Body
中收到了 0 个字节。有人能帮我一下吗?我在 Az Function 中看到了一些关于空事件的其他类似问题。这是不同的,因为每次我发送一批 10 时都会触发触发器,但不知何故数据被吃掉了
[FunctionName("EventHubTrigger1")]
public static async Task Run([EventHubTrigger("confighub",Connection = "EventHubName")] EventData[] events,ILogger log)
{
var exceptions = new List<Exception>();
foreach (EventData eventData in events)
{
try
{
//eventData.Body is System.ReadOnlyMemory<Byte>[0] instead of what the sender is sending
string messageBody = Encoding.UTF8.GetString(eventData.Body.ToArray());
log.Loginformation($"C# Event Hub trigger function processed a message: {messageBody}");
await Task.Yield();
}
catch (Exception e)
{
exceptions.Add(e);
}
}
if (exceptions.Count > 1)
throw new AggregateException(exceptions);
if (exceptions.Count == 1)
throw exceptions.Single();
}
发布者也很简单,在调试过程中我可以看到 EventData.Body
是 System.ReadOnlyMemory<Byte>[456]
private async Task SendToHub(IEnumerable<IDomain> users)
{
await using (var producerClient = new EventHubProducerClient(_eventHubConnectionString,_eventHubName))
{
try
{
CreateBatchOptions options = new CreateBatchOptions();
options.PartitionKey = "user";
using EventDataBatch eventBatch = await producerClient.CreateBatchAsync(options);
foreach (var user in users)
{
var json = JsonSerializer.Serialize(user);
eventBatch.TryAdd(new Azure.Messaging.EventHubs.EventData(Encoding.UTF8.GetBytes(json)));
}
//During Debugging I can see that the Body is 456 bytes
await producerClient.SendAsync(eventBatch);
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
解决方法
我怀疑使用两个不同版本的 EventHub 库的原因 - 发送方使用版本 5,您的 Az 函数接收方使用版本 4。
只需考虑当接收方收到 Microsoft.Azure.EventHubs.EventData 时,发送方发送 Azure.Messaging.EventHubs.EventData。
查看详情Guide for migrating to Azure.Messaging.EventHubs from Microsoft.Azure.EventHubs。
尝试在发送方切换到版本 4,或将 Function 降级以使用 Microsoft.Azure.EventHubs (code ref):
File "packet_sniffer.py",line 32,in <module>
sniff("wlan0")
File "packet_sniffer.py",line 7,in sniff
scapy.sniff(iface=interface,store=False,prn=process_sniffed_packets)
File "/usr/local/lib/python3.8/dist-packages/scapy-2.4.4.dev204-py3.8.egg/scapy/sendrecv.py",line 1058,in sniff
sniffer._run(*args,**kwargs)
File "/usr/local/lib/python3.8/dist-packages/scapy-2.4.4.dev204-py3.8.egg/scapy/sendrecv.py",line 1011,in _run
session.on_packet_received(p)
File "/usr/local/lib/python3.8/dist-packages/scapy-2.4.4.dev204-py3.8.egg/scapy/sessions.py",line 108,in on_packet_received
result = self.prn(pkt)
File "packet_sniffer.py",line 24,in process_sniffed_packets
print("[+] HTTP Request >>" + url)
TypeError: can only concatenate str (not "bytes") to str
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