YDK return value of YANG action missing some attributes

[ghost]

Currently, the result of a running a YANG action is returned as a datanode here. However, when the return value of this function is encoded using YDK path Codec, it seems to be missing some parts of the data.

[nitishv]

Please find attached a test script and log used to re-produce this issue.

nso_action_rpc_test_code.txt

ydk.log

Thanks
Nitish (nvashish@cisco.com)
Crosswork, Cisco

[ygorelik]

The tailf Yang models use extensions defined in tailf-commmon.yang, including definition of sync-from node. This feature is not supported by YDK, which causes the described symptoms. All the Yang model extensions are simply dropped in YDK.

In order to provide some ways to analyze RPC data received from device, it was developed new API function, which returns data as a string (str):

    str NetconfSession.execute_netconf_operation( Rpc )

Here is the script with this new feature:

from ydk.providers import NetconfServiceProvider
from ydk.path import Repository
from ydk.services import Datastore
from ydk.path import Codec
from ydk.types import EncodingFormat
import logging
logger = logging.getLogger('ydk')

router_ip = '192.168.123.12'

provider = NetconfServiceProvider(repo=Repository('/opt/robot/data/cache'), address='192.168.123.111', username='nso', password='cisco123', port=2022)

data = '''<devices xmlns="http://tail-f.com/ns/ncs"><device><name>%s</name><sync-from/></device></devices>'''%router_ip

rpc = provider.get_session().get_root_schema().create_rpc("tailf-actions:action")
rpc.get_input_node().create_datanode("data", data)

result = provider.get_session().execute_netconf_operation(rpc)
print(result)

The script produces this result:

2019-03-29 00:28:55,593 - ydk - INFO - Connected to 192.168.123.111 on port 2022 using ssh with timeout of -1
2019-03-29 00:28:55,593 - ydk - INFO - ============= Sending RPC to device =============
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"><action xmlns="http://tail-f.com/ns/netconf/actions/1.0">
  <data><devices xmlns="http://tail-f.com/ns/ncs"><device><name>192.168.123.12</name><sync-from/></device></devices></data>
</action>
</rpc>
2019-03-29 00:29:02,392 - ydk - INFO - ============= Received RPC from device =============
<?xml version="1.0" encoding="UTF-8"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="2">
  <data>
    <devices xmlns="http://tail-f.com/ns/ncs">
      <device>
        <name>192.168.123.12</name>
        <sync-from>
          <result>true</result>
        </sync-from>
      </device>
    </devices>
  </data>
</rpc-reply>

<data>
    <devices xmlns="http://tail-f.com/ns/ncs">
      <device>
        <name>192.168.123.12</name>
        <sync-from>
          <result>true</result>
        </sync-from>
      </device>
    </devices>
  </data>
2019-03-29 00:29:02,392 - ydk - INFO - Disconnected from device
root@robot-nca-66dfd4ff7f-88dm7:/var/log/robot#