Python code demonstrating a validation callback.
# -*- mode: python; python-indent: 4 -*-
import ncs
from ncs.dp import Daemon
from ncs.maapi import Maapi
from _ncs.dp import register_valpoint_cb, register_trans_validate_cb, trans_set_fd
class Validation(object):
def __init__(self, log):
self.log = log
self.daemon = Daemon("foo-validation-daemon", log=log)
self.maapi = Maapi()
register_trans_validate_cb(self.daemon.ctx(), self)
register_valpoint_cb(self.daemon.ctx(),
'the-validation-callpoint-name',
self)
self.daemon.start()
def cb_validate(self, tctx, kp, newval):
self.log.info('validate called')
# return ncs.CONFD_ERR to fail the validation otherwise
# ncs.CONFD_OK
return ncs.CONFD_OK
def cb_init(self, tctx):
self.maapi.attach(tctx)
trans_set_fd(tctx, self.daemon._wsock)
def cb_stop(self, tctx):
self.maapi.detach(tctx)
# ---------------------------------------------
# COMPONENT THREAD THAT WILL BE STARTED BY NCS.
# ---------------------------------------------
class Main(ncs.application.Application):
def setup(self):
# The application class sets up logging for us. It is accessible
# through 'self.log' and is a ncs.log.Log instance.
self.log.info('Main RUNNING')
self.v = Validation(self.log)
# If we registered any callback(s) above, the Application class
# took care of creating a daemon (related to the service/action point).
# When this setup method is finished, all registrations are
# considered done and the application is 'started'.
def teardown(self):
# When the application is finished (which would happen if NCS went
# down, packages were reloaded or some error occurred) this teardown
# method will be called.
self.log.info('Main FINISHED')
