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branblac@cisco.com
Enthusiast

Python Data Provider Example

Does anyone have example of a working data provider package leveraging python for an example? The Docs directory has a Java exmaple, but curious if anyone has a walk through or package example in python they could share.

Interested in this capability for external services like ServiceNow, or an IPAM system.

Thanks,

Brandon

3 REPLIES 3
frjansso
Cisco Employee

Really a toy example, but might send you off in the right direction. Please change confd for ncs in the imports.

YANG:

  container interface {

    list GigabitEthernet {

      key "name";

      leaf name {

        type string;

      }

      leaf shutdown {

        type empty;

      }

      container stats {

        config false;

        tailf:callpoint "stats";

        leaf sent {

          type uint32;

        }

        leaf received {

          type uint32;

        }

      }

    import logging

    import random

    from confd.experimental import DataCallbacks

    from _confd.dp import register_data_cb

  class Handler(object):

    def __init__(self, log):

        self.log = log

    def get_object(self, tctx, kp, args):

        recv = random.randint(0, 10000)

        sent = random.randint(0, 10000)

        return {

            'stats': {

                'received': recv,

                'sent': sent

            }

        }

    def get_next(self, tctx, kp, args, next):

        self.log.info('get_next: ' + str(kp))

        return None

    def count(self):

        self.log.info('count: ')

        print('count')

        return 0

  def start(daemon):

    log = logging.getLogger(__name__)

    dp = DataCallbacks(log)

    dp.register('/config:interface/config:GigabitEthernet', Handler(log))

    register_data_cb(daemon.ctx(), 'stats', dp)

Thanks Fredrik!

Apologies for my ignorance, how would I structure this as a package inside NSO?

For example to beign would I leverage:

ncs-make-package --service-skeleton python test_dp  --component-class NAME (default main.Main)


then remove the service references in YANG?


I'll experiment and try! But wanted to double check.


Thanks again,

Brandon

Yes, that's the way I'd do it!