[Python] Does anyone have a full working example of completion action in Python

[fwclements1]

I'm beating my head against a wall here trying to pivot from either erlang or java examples to python.

What I'm in despirate need of is a _working_ example of something akin to the tailf:cli-completion-actionpoint if-complete but in Python.  The goal being tab completion of interface names from within services for a given device. 

Can anyone provide anything?  The only hit I'm finding is from @mohamkh7 located here.  However, it doesn't load for me.

[fwclements1 · Accepted solution]

I got it working and not as difficult as i originally thought!

Yang model:

module network-link {
  namespace "http://example.com/network-link";
  prefix network-link;

  import tailf-common { prefix tailf; }
  import tailf-ncs { prefix ncs; }

  description
    "Bla bla...";

  revision 2016-01-01 {
    description
      "Initial revision.";
  }

  augment /ncs:services {
    container network-link {
      list connectivity {
        // This represents a physical link between two ports
        key cid;
        leaf cid {
          tailf:info "A unique circuit identifier for a link";
          type string;
        }

        uses ncs:service-data;

        list endpoint {
          key "device interface";

          leaf device {
            type leafref {
              path "/ncs:devices/ncs:device/ncs:name";
            }
          }

          leaf interface {
            type string;
            tailf:cli-completion-actionpoint if-action;
          }
        }
      }
    }
  } // augment /ncs:services {
}

Python file with simple logging:

import _ncs
import ncs
from ncs.dp import Action

class ActionCallbacks(Action):

    @Action.action
    def cb_action(self, uinfo, name, kp, input, output, trans):
        self.log.info("ActionCallback: ", "cb_action")

    def cb_completion(self, uinfo, cli_style, token, completion_char,
                      kp, cmdpath, cmdparam_id, simpleType, extra):
        self.log.info("ActionCallback: ", "cb_completion({},{},{},{},{},{},{},{},{})".format(
            uinfo, cli_style, token, completion_char, kp, cmdpath, cmdparam_id, simpleType, extra))

        if_list = [(0, 'ge-0/1', None), (0, 'fe-0/0', None), (0, 'ge-0/2', None)]
        _ncs.dp.action_reply_completion(uinfo, if_list)


class IfComplete(ncs.application.Application):
    def setup(self):
        self.log.info('--- if_complete.IFComplete setup')
        self.register_action('if-action', ActionCallbacks)

    def teardown(self):
        self.log.info("-- if_complete.IfComplete teardown")

Output:

admin@ncs(config)# services network-link connectivity 1 endpoint reflector-0 ?
Possible completions:
  fe-0/0  ge-0/1  ge-0/2