Index error returned when converting an empty string from JSON to XML

[ldacol]

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Expected Behavior

Conversion from JSON to XML finalizes successfully

Current Behavior

An IndexError: basic_string::at is returned when attempting a conversion from JSON to XML with payload choice-value:""
The payload is correctly converted from XML to JSON to fail when converted back to XML.

Steps to Reproduce

Issue is shown when attempting to convert the following JSON payload

{
  "junos-conf-root:configuration": {
    "junos-conf-policy-options:policy-options": {
      "policy-statement": [
        {
          "name": "IPV4",
          "term": [
            {
              "name": "OSPF-ACCEPT",
              "from": {
                "protocol": [
                  "ospf"
                ],
                "route-filter": [
                  {
                    "address": "1.1.1.0/24",
                    "choice-ident": "orlonger",
                    "choice-value": ""
                  }
                ]
              },
              "then": {
                "accept": [null]
              }
            }
          ]
        }
      ]
    }
  }
}

Your Script

def yang_yaml_to_xml(json_file):
    config_json_yang = json.dumps(json.load(open(json_file)))
    print (config_json_yang)
    decoded_json_yang = CODEC.decode(JSON_PROVIDER, config_json_yang)
    yang_xml = CODEC.encode(XML_PROVIDER, decoded_json_yang)
    return yang_xml

Logs

Enable logging and post the logs below

Traceback (most recent call last):
  File "convert1.py", line 249, in <module>
    print(yang_yaml_to_xml(ARGS['yaml_file']))
  File "convert1.py", line 218, in yang_yaml_to_xml
    decoded_json_yang = CODEC.decode(JSON_PROVIDER, config_json_yang)
  File "/opt/neteng/lib/python3.6/site-packages/ydk/errors/error_handler.py", line 112, in helper
    return func(self, provider, entity, *args, **kwargs)
  File "/opt/neteng/lib/python3.6/site-packages/ydk/services/codec_service.py", line 140, in decode
    return self._decode(provider, payload_holder, subtree)
  File "/opt/neteng/lib/python3.6/site-packages/ydk/services/codec_service.py", line 174, in _decode
    root_data_node = codec_service.decode(root_schema, payload, provider.encoding)
IndexError: basic_string::at

System Information

Red Hat Enterprise Linux Server release 7.9 (Maipo)
Python 3.6.9

[ygorelik]

Resolved in YDK-0.8.6.3; see this commit for details.

Test script:

import unittest
import logging

from test_utils import enable_logging

from ydk.providers import CodecServiceProvider
from ydk.services import CodecService

from ydk.models.ydktest import ydktest_sanity as ysanity


class SanityTest(unittest.TestCase):

    def setUp(self):
        self.codec_service = CodecService()
        self.json_provider = CodecServiceProvider(type='json')
        enable_logging(logging.DEBUG)

    def test_json_empty_string(self):
        r = ysanity.Runner()
        r.ytypes.built_in_t.name = ""

        payload = self.codec_service.encode(self.json_provider, r)
        expected = '''{
  "ydktest-sanity:runner": {
    "ytypes": {
      "built-in-t": {
        "name": ""
      }
    }
  }
}
'''
        self.assertEqual(expected, payload)
        entity = self.codec_service.decode(self.json_provider, payload)
        self.assertEqual(r, entity)

if __name__ == '__main__':
    suite = unittest.TestSuite()
    testloader = unittest.TestLoader()
    testnames = testloader.getTestCaseNames(SanityTest)
    for name in testnames:
        suite.addTest(SanityTest(name))
    ret = not unittest.TextTestRunner(verbosity=2).run(suite).wasSuccessful()