在Azure服务总线上接收有关主题订阅的信息

Question

我用来接收消息的代码如下：

while True:
    msg = bus_service.receive_subscription_message(topic_name, subscription_name, peek_lock=True)
    print('Mensaje Recibido-->',msg.body)
    data = msg.body
    send_MyApp(data.decode("utf-8"))
    msg.delete()

当我运行它时得到的是下一个信息：

Message --> None
Exception in thread Thread-1:
Traceback (most recent call last):
File "..\AppData\Local\Programs\Python\Python36-32\lib\threading.py", line 916, in _bootstrap_inner
self.run()
File "..\AppData\Local\Programs\Python\Python36-32\lib\threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "../Python/ServiceBusSuscription/receive_subscription.py", line 19, in receive_subscription
send_MyApp(data.decode("utf-8"))
AttributeError: 'NoneType' object has no attribute 'decode'

如果我从线程中运行接收器，它会显示这条错误消息（当跳过该超时时，我应该删除该超时，因为在等待的守护进程中它不能跳过）。基本上都是同样的错误：

Traceback (most recent call last):
  File "../Python/ServiceBusSuscription/receive_subscription.py", line 76, in <module>
    main()
  File "../Python/ServiceBusSuscription/receive_subscription.py", line 72, in main
    demo(bus_service)
  File "../Python/ServiceBusSuscription//receive_subscription.py", line 25, in demo
    print(msg.body.decode("utf-8"))
AttributeError: 'NoneType' object has no attribute 'decode'

更新

我认为问题出在Azure服务总线和订阅和过滤器上。实际上，我有23个过滤器，我认为Azure服务总线只工作于1个订阅：（但我不确定这一点。

Answer 1

我试图成功地复制你的问题，然后我发现如果你的主题中没有信息，它就会发生。

因此，在解码msg.body的字节之前，需要检查msg.body的值或类型是None还是type(None)，如下所示。

data = msg.body
if data != None: 
# Or if type(data) == type(b''):
    send_MyApp(data.decode("utf-8"))
    msg.delete()
else:
    ...

希望有帮助。