Public bug reported:
A script my team uses python3-amqplib for RabbitMQ connectivity
checking, but in the case of not being able to connect, the error we get
when running from Python 3 hides the real problem behind a Python 3
variable scoping issue.
This is reproducible via: python3 -c "from amqplib import client_0_8 as
amqp; amqp.Connection()"
The above will generate this output (assuming no RabbitMQ is running on
your system):
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3/dist-packages/amqplib/client_0_8/connection.py", line
129, in __init__
self.transport = create_transport(host, connect_timeout, ssl)
File "/usr/lib/python3/dist-packages/amqplib/client_0_8/transport.py", line
281, in create_transport
return TCPTransport(host, connect_timeout)
File "/usr/lib/python3/dist-packages/amqplib/client_0_8/transport.py", line
85, in __init__
raise socket.error(msg)
UnboundLocalError: local variable 'msg' referenced before assignment
I would instead expect the following, which I see on Bionic when running
the same command from above, but via Python 2 instead:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/connection.py",
line 129, in __init__
self.transport = create_transport(host, connect_timeout, ssl)
File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/transport.py", line
281, in create_transport
return TCPTransport(host, connect_timeout)
File "/usr/lib/python2.7/dist-packages/amqplib/client_0_8/transport.py", line
85, in __init__
raise socket.error, msg
socket.error: [Errno 111] Connection refused
In Python 2, we get "Connection refused" - in Python 3, we get a Python
error, which hides the "Connection refused" message.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: python3-amqplib (not installed)
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 16 14:08:00 2020
InstallationDate: Installed on 2019-01-04 (621 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
SourcePackage: python-amqplib
UpgradeStatus: Upgraded to focal on 2020-01-31 (229 days ago)
** Affects: python-amqplib (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1895893
Title:
Python 3 variable scoping issue is hiding error tracebacks
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