Qpid Proton Messenger API错误处理

Question

I'm getting desperate trying to handle errors when sending messages using Qpid Proton AMQP Messenger API for Python.

This is an example message sending session from the interactive Python interpreter when sending to a nonexistent queue myqueue on a Qpid broker running on localhost :

>>> from proton import *
>>> mng = Messenger()
>>> mng.timeout = 2000L
>>> m = Message()
>>> m.address = 'amqp://localhost/myqueue'
>>> m.subject = 'Test message'
>>> tracker = mng.put(m)
>>> repr(mng.status(tracker)) # status before send
'None'
>>> ret = mng.send()          # send unconditionally returns None
LINK ERROR (amqp:not-found) Node not found: myqueue
>>> repr(mng.status(tracker)) # status after send
'None'
>>> mng.stop()

The LINK ERROR is printed directly to stdout (or stderr) and there is no indication of the message not being delivered in the API. The status() call returns None before the send when the message is sitting in the buffer and also after, when it was dropped.

Am I missing something?

Using Python 2.7, Qpid Proton 0.7.

Answer 1

Finally. I read about property outgoing_window of the messenger defaulting to 0. It's the number of tracked outgoing messages. Setting it to a higher number solves the problem:

>>> from proton import *
>>> mng = Messenger()
>>> mng.timeout = 2000L
>>> mng.outgoing_window = 1
>>> m = Message()
>>> m.address = 'amqp://localhost/myqueue'
>>> m.subject = 'Test message'
>>> tracker = mng.put(m)
>>> repr(mng.status(tracker))
'PENDING'
>>> ret = mng.send()
LINK ERROR (amqp:not-found) Node not found: myqueue
>>> repr(mng.status(tracker))
'ABORTED'
>>> mng.stop()

Now I can track status of the message and see that it was ABORTED .