Locust is not starting with pyzmq 23.0.0

[marcinh]

Describe the bug

With latest ZMQ release (23.0.0) Locust stopped working - following error appears on Master:

locust-master: File "/root/.local/share/virtualenvs/locust-1T7N9san/bin/locust", line 8, in <module>
locust-master: sys.exit(main())
locust-master: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/main.py", line 230, in main
locust-master: runner = environment.create_master_runner(
locust-master: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/env.py", line 138, in create_master_runner
locust-master: return self._create_runner(
locust-master: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/env.py", line 116, in _create_runner
locust-master: self.runner = runner_class(self, *args, **kwargs)
locust-master: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/runners.py", line 619, in __init__
locust-master: self.server = rpc.Server(master_bind_host, master_bind_port)
locust-master: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/rpc/zmqrpc.py", line 58, in __init__
locust-master: BaseSocket.__init__(self, zmq.ROUTER)
locust-master: AttributeError: module 'zmq.green' has no attribute 'ROUTER'

and similar on worker:

locust-worker_four: Traceback (most recent call last):
locust-worker_four: File "/root/.local/share/virtualenvs/locust-1T7N9san/bin/locust", line 8, in <module>
locust-worker_four: sys.exit(main())
locust-worker_four: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/main.py", line 236, in main
locust-worker_four: runner = environment.create_worker_runner(options.master_host, options.master_port)
locust-worker_four: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/env.py", line 154, in create_worker_runner
locust-worker_four: return self._create_runner(
locust-worker_four: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/env.py", line 116, in _create_runner
locust-worker_four: self.runner = runner_class(self, *args, **kwargs)
locust-worker_four: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/runners.py", line 1051, in __init__
locust-worker_four: self.client = rpc.Client(master_host, master_port, self.client_id)
locust-worker_four: File "/root/.local/share/virtualenvs/locust-1T7N9san/lib/python3.9/site-packages/locust/rpc/zmqrpc.py", line 71, in __init__
locust-worker_four: BaseSocket.__init__(self, zmq.DEALER)
locust-worker_four: AttributeError: module 'zmq.green' has no attribute 'DEALER'

Expected behavior

Actual behavior

Steps to reproduce

Install Locust with inclusion of latest ZMQ release - start master o start worker

Environment

• OS: CentOS
• Python version: 3.9
• Locust version: 2.8.4
• Locust command line that you ran:
• Locust file contents (anonymized if necessary):

[shyim]

Lock the version and release a new version? 🤔
https://github.com/locustio/locust/blob/master/setup.cfg#L43

[shyim]

added to my requirements.txt

pyzmq==22.3.0

and its working now 😅

[xorphitus]

PyZMQ 23.0.0 was released about 3 hours before this issue report. It moved the constants to enums and I think it's the cause.
https://github.com/zeromq/pyzmq/blob/main/docs/source/changelog.md#2300

Maybe this commit affected.

[walsm232]

This is also causing issues with my application when run in a Master / Worker mode. Needed to pin 22.3.0 to resolve it. The issue seems to be with pyzmq v.23.0.0

[FelipeMiranda]

Quick and Dirt fix for version 2.4.3 marcosborges/terraform-aws-loadtest-distribuited if don't wish to update to Locust 2.9.0

file: locust.entrypoint.leader.full.sh.tpl

...
# LOCUST
export LOCUST_VERSION="2.4.3"
sudo pip3 install locust==$LOCUST_VERSION
sudo pip3 uninstall pyzmq
sudo pip3 install pyzmq=="22.3.0"
...

file: locust.entrypoint.node.full.sh.tpl

...
# LOCUST
export LOCUST_VERSION="2.4.3"
sudo pip3 install locust==$LOCUST_VERSION
sudo pip3 uninstall pyzmq
sudo pip3 install pyzmq=="22.3.0"
...