Subscribe to NETCONF notifications using Ansible

Currently working on software update feature on embedded platform using NETCONF and I'd like to be able to use Ansible.

I was able to communicate with NETCONF server using Ansible to get configuration and to fire RPC but I didn't find anything about subscribing to notifications.

To better understand my issue here, each RPC (download, install and activate) works in two steps. First I call the RPC, starting the procedure which could take time and when it's over, I receive a notification telling me it's done and I can move on to the next step.

So, is it possible to subscribe to NETCONF notification and wait for it using Ansible ?

It appears there is no builtin Ansible module capable of subscribing to NETCONF notification but it can be done using a python script executed by the playbook.

Here is the python code subscribing to a NETCONF notification :

from ncclient import manager
from ncclient.xml_ import to_ele
import sys

def main():
    # Variables
    hostname = sys.argv[1]
    port =  sys.argv[2]
    username = sys.argv[3]
    password = sys.argv[4]
    
    # Connection to NETCONF
    with manager.connect(host=hostname, port=port, username=username, password=password, hostkey_verify=False, allow_agent=False, look_for_keys=False) as nchandle:
        # Subscribe to software-download notifications
        sub_rpc = """
        <create-subscription xmlns="urn:ietf:params:xml:ns:netconf:notification:1.0">
            <filter type="subtree">
                <download-event xmlns="urn:o-ran:software-management:1.0" />
            </filter>
        </create-subscription>
        """
        response = nchandle.dispatch(to_ele(sub_rpc))
        
        # Wait for notification
        while True:
            notif = nchandle.take_notification(timeout=30)
            if notif:
                print(notif)
                break
        
main()

Ansible task executing python script :

  - name: Wait for download notification
    ansible.builtin.script:
      cmd: ../python/software-download-notif.py {{ansible_host}} {{ansible_port}} {{ansible_user}} {{ansible_password}}
      executable: /usr/bin/python3
    delegate_to: 127.0.0.1