Unable to Pickle Array of Message Objects

[dgokeeffe]

• Package Name: azure-servicebus
• Package Version: 7.0.0.0b4
• Operating System: Red Hat 4.8.5-39
• Python Version: 3.6.8

Describe the bug
When attempting to pickle.dump() an array of Message objects a TypeError is raised.

To Reproduce
Steps to reproduce the behavior:

1. Attempt to pickle a Message object

Expected behavior
The object is pickled correctly

Screenshots

import pickle
from azure.servicebus import Message

msgs = [Message(body={"test"})]
pickle.dump(msgs, open("./dump", "wb"))

File "stringsource", line 2, in uamqp.c_uamqp.StringValue.__reduce_cython__
TypeError: no default __reduce__ due to non-trivial __cinit__

[KieranBrantnerMagee]

Hey @dgokeeffe

Thanks for bringing this up. From a brief read of the error I have an inkling what's causing this (the core of this library is a C-based AMQP library) and why it might not play well with Pickle. I've put this on our backlog as a feature req and we'll need to look into what would be required to address this.

I will say, without making too many promises, that there is a long-term plan to address the AMQP library situation, but we can see if there is any potential workaround in the interim.