tests/transportpce_tests/common/test_utils_rfc8040.py

   1 #!/usr/bin/env python
   2
   3 ##############################################################################
   4 # Copyright (c) 2021 Orange, Inc. and others.  All rights reserved.
   5 #
   6 # All rights reserved. This program and the accompanying materials
   7 # are made available under the terms of the Apache License, Version 2.0
   8 # which accompanies this distribution, and is available at
   9 # http://www.apache.org/licenses/LICENSE-2.0
  10 ##############################################################################
  11
  12 # pylint: disable=no-member
  13
  14 import json
  15 import os
  16 # pylint: disable=wrong-import-order
  17 import sys
  18 import re
  19 import signal
  20 import subprocess
  21 import time
  22
  23 import psutil
  24 import requests
  25
  26 # pylint: disable=import-error
  27 import simulators
  28
  29 SIMS = simulators.SIMS
  30
  31 HONEYNODE_OK_START_MSG = 'Netconf SSH endpoint started successfully at 0.0.0.0'
  32 KARAF_OK_START_MSG = re.escape(
  33     "Blueprint container for bundle org.opendaylight.netconf.restconf")+".* was successfully created"
  34 LIGHTY_OK_START_MSG = re.escape("lighty.io and RESTCONF-NETCONF started")
  35
  36 ODL_LOGIN = 'admin'
  37 ODL_PWD = 'admin'
  38 NODES_LOGIN = 'admin'
  39 NODES_PWD = 'admin'
  40
  41 TYPE_APPLICATION_JSON = {'Content-Type': 'application/json', 'Accept': 'application/json'}
  42 TYPE_APPLICATION_XML = {'Content-Type': 'application/xml', 'Accept': 'application/xml'}
  43
  44 CODE_SHOULD_BE_200 = 'Http status code should be 200'
  45 CODE_SHOULD_BE_201 = 'Http status code should be 201'
  46
  47 SIM_LOG_DIRECTORY = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'log')
  48
  49 process_list = []
  50
  51 if 'USE_ODL_ALT_RESTCONF_PORT' in os.environ:
  52     RESTCONF_PORT = os.environ['USE_ODL_ALT_RESTCONF_PORT']
  53 else:
  54     RESTCONF_PORT = 8181
  55
  56 RESTCONF_PATH_PREFIX = {'rfc8040': '/rests',
  57                         'draft-bierman02': '/restconf'}
  58 if 'USE_ODL_RESTCONF_VERSION' in os.environ:
  59     RESTCONF_VERSION = os.environ['USE_ODL_RESTCONF_VERSION']
  60     if RESTCONF_VERSION not in RESTCONF_PATH_PREFIX:
  61         print('unsupported RESTCONF version ' + RESTCONF_VERSION)
  62         sys.exit(3)
  63 else:
  64     RESTCONF_VERSION = 'rfc8040'
  65
  66 RESTCONF_BASE_URL = 'http://localhost:' + str(RESTCONF_PORT) + RESTCONF_PATH_PREFIX[RESTCONF_VERSION]
  67
  68 if 'USE_ODL_ALT_KARAF_INSTALL_DIR' in os.environ:
  69     KARAF_INSTALLDIR = os.environ['USE_ODL_ALT_KARAF_INSTALL_DIR']
  70 else:
  71     KARAF_INSTALLDIR = 'karaf'
  72
  73 KARAF_LOG = os.path.join(
  74     os.path.dirname(os.path.realpath(__file__)),
  75     '..', '..', '..', KARAF_INSTALLDIR, 'target', 'assembly', 'data', 'log', 'karaf.log')
  76
  77 if 'USE_LIGHTY' in os.environ and os.environ['USE_LIGHTY'] == 'True':
  78     TPCE_LOG = 'odl-' + str(os.getpid()) + '.log'
  79 else:
  80     TPCE_LOG = KARAF_LOG
  81
  82 #
  83 # Basic HTTP operations
  84 #
  85
  86
  87 def get_request(url):
  88     return requests.request(
  89         'GET', url.format(RESTCONF_BASE_URL),
  90         headers=TYPE_APPLICATION_JSON,
  91         auth=(ODL_LOGIN, ODL_PWD))
  92
  93
  94 def put_request(url, data):
  95     return requests.request(
  96         'PUT', url.format(RESTCONF_BASE_URL),
  97         data=json.dumps(data),
  98         headers=TYPE_APPLICATION_JSON,
  99         auth=(ODL_LOGIN, ODL_PWD))
 100
 101
 102 def delete_request(url):
 103     return requests.request(
 104         'DELETE', url.format(RESTCONF_BASE_URL),
 105         headers=TYPE_APPLICATION_JSON,
 106         auth=(ODL_LOGIN, ODL_PWD))
 107
 108
 109 def post_request(url, data):
 110     if data:
 111         print(json.dumps(data))
 112         return requests.request(
 113             "POST", url.format(RESTCONF_BASE_URL),
 114             data=json.dumps(data),
 115             headers=TYPE_APPLICATION_JSON,
 116             auth=(ODL_LOGIN, ODL_PWD))
 117     return requests.request(
 118         "POST", url.format(RESTCONF_BASE_URL),
 119         headers=TYPE_APPLICATION_JSON,
 120         auth=(ODL_LOGIN, ODL_PWD))
 121
 122 #
 123 # Process management
 124 #
 125
 126
 127 def start_sims(sims_list):
 128     for sim in sims_list:
 129         print('starting simulator ' + sim[0] + ' in OpenROADM device version ' + sim[1] + '...')
 130         log_file = os.path.join(SIM_LOG_DIRECTORY, SIMS[sim]['logfile'])
 131         process = start_honeynode(log_file, sim)
 132         if wait_until_log_contains(log_file, HONEYNODE_OK_START_MSG, 100):
 133             print('simulator for ' + sim[0] + ' started')
 134         else:
 135             print('simulator for ' + sim[0] + ' failed to start')
 136             shutdown_process(process)
 137             for pid in process_list:
 138                 shutdown_process(pid)
 139             sys.exit(3)
 140         process_list.append(process)
 141     return process_list
 142
 143
 144 def start_tpce():
 145     print('starting OpenDaylight...')
 146     if 'USE_LIGHTY' in os.environ and os.environ['USE_LIGHTY'] == 'True':
 147         process = start_lighty()
 148         start_msg = LIGHTY_OK_START_MSG
 149     else:
 150         process = start_karaf()
 151         start_msg = KARAF_OK_START_MSG
 152     if wait_until_log_contains(TPCE_LOG, start_msg, time_to_wait=300):
 153         print('OpenDaylight started !')
 154     else:
 155         print('OpenDaylight failed to start !')
 156         shutdown_process(process)
 157         for pid in process_list:
 158             shutdown_process(pid)
 159         sys.exit(1)
 160     process_list.append(process)
 161     return process_list
 162
 163
 164 def start_karaf():
 165     print('starting KARAF TransportPCE build...')
 166     executable = os.path.join(
 167         os.path.dirname(os.path.realpath(__file__)),
 168         '..', '..', '..', KARAF_INSTALLDIR, 'target', 'assembly', 'bin', 'karaf')
 169     with open('odl.log', 'w', encoding='utf-8') as outfile:
 170         return subprocess.Popen(
 171             ['sh', executable, 'server'], stdout=outfile, stderr=outfile, stdin=None)
 172
 173
 174 def start_lighty():
 175     print('starting LIGHTY.IO TransportPCE build...')
 176     executable = os.path.join(
 177         os.path.dirname(os.path.realpath(__file__)),
 178         '..', '..', '..', 'lighty', 'target', 'tpce',
 179         'clean-start-controller.sh')
 180     with open(TPCE_LOG, 'w', encoding='utf-8') as outfile:
 181         return subprocess.Popen(
 182             ['sh', executable], stdout=outfile, stderr=outfile, stdin=None)
 183
 184
 185 def install_karaf_feature(feature_name: str):
 186     print('installing feature ' + feature_name)
 187     executable = os.path.join(
 188         os.path.dirname(os.path.realpath(__file__)),
 189         '..', '..', '..', KARAF_INSTALLDIR, 'target', 'assembly', 'bin', 'client')
 190     return subprocess.run([executable],
 191                           input='feature:install ' + feature_name + '\n feature:list | grep '
 192                           + feature_name + ' \n logout \n',
 193                           universal_newlines=True, check=False)
 194
 195
 196 def shutdown_process(process):
 197     if process is not None:
 198         for child in psutil.Process(process.pid).children():
 199             child.send_signal(signal.SIGINT)
 200             child.wait()
 201         process.send_signal(signal.SIGINT)
 202
 203
 204 def start_honeynode(log_file: str, sim):
 205     executable = os.path.join(os.path.dirname(os.path.realpath(__file__)),
 206                               '..', '..', 'honeynode', sim[1], 'honeynode-simulator', 'honeycomb-tpce')
 207     sample_directory = os.path.join(os.path.dirname(os.path.realpath(__file__)),
 208                                     '..', '..', 'sample_configs', 'openroadm', sim[1])
 209     if os.path.isfile(executable):
 210         with open(log_file, 'w', encoding='utf-8') as outfile:
 211             return subprocess.Popen(
 212                 [executable, SIMS[sim]['port'], os.path.join(sample_directory, SIMS[sim]['configfile'])],
 213                 stdout=outfile, stderr=outfile)
 214     return None
 215
 216
 217 def wait_until_log_contains(log_file, regexp, time_to_wait=60):
 218     # pylint: disable=lost-exception
 219     # pylint: disable=consider-using-with
 220     stringfound = False
 221     filefound = False
 222     line = None
 223     try:
 224         with TimeOut(seconds=time_to_wait):
 225             while not os.path.exists(log_file):
 226                 time.sleep(0.2)
 227             filelogs = open(log_file, 'r', encoding='utf-8')
 228             filelogs.seek(0, 2)
 229             filefound = True
 230             print("Searching for pattern '" + regexp + "' in " + os.path.basename(log_file), end='... ', flush=True)
 231             compiled_regexp = re.compile(regexp)
 232             while True:
 233                 line = filelogs.readline()
 234                 if compiled_regexp.search(line):
 235                     print('Pattern found!', end=' ')
 236                     stringfound = True
 237                     break
 238                 if not line:
 239                     time.sleep(0.1)
 240     except TimeoutError:
 241         print('Pattern not found after ' + str(time_to_wait), end=' seconds! ', flush=True)
 242     except PermissionError:
 243         print('Permission Error when trying to access the log file', end=' ... ', flush=True)
 244     finally:
 245         if filefound:
 246             filelogs.close()
 247         else:
 248             print('log file does not exist or is not accessible... ', flush=True)
 249         return stringfound
 250
 251
 252 class TimeOut:
 253     def __init__(self, seconds=1, error_message='Timeout'):
 254         self.seconds = seconds
 255         self.error_message = error_message
 256
 257     def handle_timeout(self, signum, frame):
 258         raise TimeoutError(self.error_message)
 259
 260     def __enter__(self):
 261         signal.signal(signal.SIGALRM, self.handle_timeout)
 262         signal.alarm(self.seconds)
 263
 264     def __exit__(self, type, value, traceback):
 265         # pylint: disable=W0622
 266         signal.alarm(0)
 267
 268 #
 269 # Basic NetCONF device operations
 270 #
 271
 272
 273 def mount_device(node: str, sim: str):
 274     url = {'rfc8040': '{}/data/network-topology:network-topology/topology=topology-netconf/node={}',
 275            'draft-bierman02': '{}/config/network-topology:network-topology/topology/topology-netconf/node/{}'}
 276     body = {'node': [{
 277         'node-id': node,
 278         'netconf-node-topology:username': NODES_LOGIN,
 279         'netconf-node-topology:password': NODES_PWD,
 280         'netconf-node-topology:host': '127.0.0.1',
 281         'netconf-node-topology:port': SIMS[sim]['port'],
 282         'netconf-node-topology:tcp-only': 'false',
 283         'netconf-node-topology:pass-through': {}}]}
 284     response = put_request(url[RESTCONF_VERSION].format('{}', node), body)
 285     if wait_until_log_contains(TPCE_LOG, re.escape('Triggering notification stream NETCONF for node ' + node), 180):
 286         print('Node ' + node + ' correctly added to tpce topology', end='... ', flush=True)
 287     else:
 288         print('Node ' + node + ' still not added to tpce topology', end='... ', flush=True)
 289         if response.status_code == requests.codes.ok:
 290             print('It was probably loaded at start-up', end='... ', flush=True)
 291         # TODO an else-clause to abort test would probably be nice here
 292     return response
 293
 294
 295 def unmount_device(node: str):
 296     url = {'rfc8040': '{}/data/network-topology:network-topology/topology=topology-netconf/node={}',
 297            'draft-bierman02': '{}/config/network-topology:network-topology/topology/topology-netconf/node/{}'}
 298     response = delete_request(url[RESTCONF_VERSION].format('{}', node))
 299     if wait_until_log_contains(TPCE_LOG, re.escape("onDeviceDisConnected: " + node), 180):
 300         print('Node ' + node + ' correctly deleted from tpce topology', end='... ', flush=True)
 301     else:
 302         print('Node ' + node + ' still not deleted from tpce topology', end='... ', flush=True)
 303     return response
 304
 305
 306 def check_device_connection(node: str):
 307     url = {'rfc8040': '{}/data/network-topology:network-topology/topology=topology-netconf/node={}?content=nonconfig',
 308            'draft-bierman02': '{}/operational/network-topology:network-topology/topology/topology-netconf/node/{}'}
 309     response = get_request(url[RESTCONF_VERSION].format('{}', node))
 310     res = response.json()
 311     return_key = {'rfc8040': 'network-topology:node',
 312                   'draft-bierman02': 'node'}
 313     if return_key[RESTCONF_VERSION] in res.keys():
 314         connection_status = res[return_key[RESTCONF_VERSION]][0]['netconf-node-topology:connection-status']
 315     else:
 316         connection_status = res['errors']['error'][0]
 317     return {'status_code': response.status_code,
 318             'connection-status': connection_status}
 319
 320
 321 def check_node_attribute_request(node: str, attribute: str, attribute_value: str):
 322     # pylint: disable=line-too-long
 323     url = {'rfc8040': '{}/data/network-topology:network-topology/topology=topology-netconf/node={}/yang-ext:mount/org-openroadm-device:org-openroadm-device/{}={}?content=nonconfig',  # nopep8
 324            'draft-bierman02': '{}/operational/network-topology:network-topology/topology/topology-netconf/node/{}/yang-ext:mount/org-openroadm-device:org-openroadm-device/{}/{}'}  # nopep8
 325     response = get_request(url[RESTCONF_VERSION].format('{}', node, attribute, attribute_value))
 326     res = response.json()
 327     return_key = {'rfc8040': 'org-openroadm-device:' + attribute,
 328                   'draft-bierman02': attribute}
 329     if return_key[RESTCONF_VERSION] in res.keys():
 330         response_attribute = res[return_key[RESTCONF_VERSION]]
 331     else:
 332         response_attribute = res['errors']['error'][0]
 333     return {'status_code': response.status_code,
 334             attribute: response_attribute}
 335
 336
 337 def del_node_attribute_request(node: str, attribute: str, attribute_value: str):
 338     # pylint: disable=line-too-long
 339     url = {'rfc8040': '{}/data/network-topology:network-topology/topology=topology-netconf/node={}/yang-ext:mount/org-openroadm-device:org-openroadm-device/{}={}',  # nopep8
 340            'draft-bierman02': '{}/config/network-topology:network-topology/topology/topology-netconf/node/{}/yang-ext:mount/org-openroadm-device:org-openroadm-device/{}/{}'}  # nopep8
 341     response = delete_request(url[RESTCONF_VERSION].format('{}', node, attribute, attribute_value))
 342     return response
 343
 344 #
 345 # Portmapping operations
 346 #
 347
 348
 349 def get_portmapping(node: str):
 350     url = {'rfc8040': '{}/data/transportpce-portmapping:network/nodes={}',
 351            'draft-bierman02': '{}/config/transportpce-portmapping:network/nodes/{}'}
 352     response = get_request(url[RESTCONF_VERSION].format('{}', node))
 353     res = response.json()
 354     return_key = {'rfc8040': 'transportpce-portmapping:nodes',
 355                   'draft-bierman02': 'nodes'}
 356     nodes = res[return_key[RESTCONF_VERSION]]
 357     return {'status_code': response.status_code,
 358             'nodes': nodes}
 359
 360
 361 def get_portmapping_node_info(node: str):
 362     url = {'rfc8040': '{}/data/transportpce-portmapping:network/nodes={}/node-info',
 363            'draft-bierman02': '{}/config/transportpce-portmapping:network/nodes/{}/node-info'}
 364     response = get_request(url[RESTCONF_VERSION].format('{}', node))
 365     res = response.json()
 366     return_key = {'rfc8040': 'transportpce-portmapping:node-info',
 367                   'draft-bierman02': 'node-info'}
 368     if return_key[RESTCONF_VERSION] in res.keys():
 369         node_info = res[return_key[RESTCONF_VERSION]]
 370     else:
 371         node_info = res['errors']['error'][0]
 372     return {'status_code': response.status_code,
 373             'node-info': node_info}
 374
 375
 376 def portmapping_request(node: str, mapping: str):
 377     url = {'rfc8040': '{}/data/transportpce-portmapping:network/nodes={}/mapping={}',
 378            'draft-bierman02': '{}/config/transportpce-portmapping:network/nodes/{}/mapping/{}'}
 379     response = get_request(url[RESTCONF_VERSION].format('{}', node, mapping))
 380     res = response.json()
 381     return_key = {'rfc8040': 'transportpce-portmapping:mapping',
 382                   'draft-bierman02': 'mapping'}
 383     mapping = res[return_key[RESTCONF_VERSION]]
 384     return {'status_code': response.status_code,
 385             'mapping': mapping}
 386
 387
 388 def portmapping_mc_capa_request(node: str, mc_capa: str):
 389     url = {'rfc8040': '{}/data/transportpce-portmapping:network/nodes={}/mc-capabilities={}',
 390            'draft-bierman02': '{}/config/transportpce-portmapping:network/nodes/{}/mc-capabilities/{}'}
 391     response = get_request(url[RESTCONF_VERSION].format('{}', node, mc_capa))
 392     res = response.json()
 393     return_key = {'rfc8040': 'transportpce-portmapping:mc-capabilities',
 394                   'draft-bierman02': 'mc-capabilities'}
 395     capabilities = res[return_key[RESTCONF_VERSION]]
 396     return {'status_code': response.status_code,
 397             'mc-capabilities': capabilities}
 398
 399 #
 400 # Topology operations
 401 #
 402
 403
 404 def get_ietf_network_request(network: str, content: str):
 405     url = {'rfc8040': '{}/data/ietf-network:networks/network={}?content={}',
 406            'draft-bierman02': '{}/{}/ietf-network:networks/network/{}'}
 407     if RESTCONF_VERSION == 'rfc8040':
 408         format_args = ('{}', network, content)
 409     elif content == 'config':
 410         format_args = ('{}', content, network)
 411     else:
 412         format_args = ('{}', 'operational', network)
 413     response = get_request(url[RESTCONF_VERSION].format(*format_args))
 414     res = response.json()
 415     return_key = {'rfc8040': 'ietf-network:network',
 416                   'draft-bierman02': 'network'}
 417     networks = res[return_key[RESTCONF_VERSION]]
 418     return {'status_code': response.status_code,
 419             'network': networks}
 420
 421
 422 def get_ietf_network_link_request(network: str, link: str, content: str):
 423     url = {'rfc8040': '{}/data/ietf-network:networks/network={}/ietf-network-topology:link={}?content={}',
 424            'draft-bierman02': '{}/{}/ietf-network:networks/network/{}/ietf-network-topology:link/{}'}
 425     if RESTCONF_VERSION == 'rfc8040':
 426         format_args = ('{}', network, link, content)
 427     elif content == 'config':
 428         format_args = ('{}', content, network, link)
 429     else:
 430         format_args = ('{}', 'operational', network, link)
 431     response = get_request(url[RESTCONF_VERSION].format(*format_args))
 432     res = response.json()
 433     return_key = {'rfc8040': 'ietf-network-topology:link',
 434                   'draft-bierman02': 'ietf-network-topology:link'}
 435     link = res[return_key[RESTCONF_VERSION]][0]
 436     return {'status_code': response.status_code,
 437             'link': link}
 438
 439
 440 def del_ietf_network_link_request(network: str, link: str, content: str):
 441     url = {'rfc8040': '{}/data/ietf-network:networks/network={}/ietf-network-topology:link={}?content={}',
 442            'draft-bierman02': '{}/{}/ietf-network:networks/network/{}/ietf-network-topology:link/{}'}
 443     if RESTCONF_VERSION == 'rfc8040':
 444         format_args = ('{}', network, link, content)
 445     elif content == 'config':
 446         format_args = ('{}', content, network, link)
 447     else:
 448         format_args = ('{}', 'operational', network, link)
 449     response = delete_request(url[RESTCONF_VERSION].format(*format_args))
 450     return response
 451
 452
 453 def add_oms_attr_request(link: str, oms_attr: str):
 454     url = {'rfc8040': '{}/data/ietf-network:networks/network={}/ietf-network-topology:link={}',
 455            'draft-bierman02': '{}/config/ietf-network:networks/network/{}/ietf-network-topology:link/{}'}
 456     url2 = url[RESTCONF_VERSION] + '/org-openroadm-network-topology:OMS-attributes/span'
 457     network = 'openroadm-topology'
 458     response = put_request(url2.format('{}', network, link), oms_attr)
 459     return response
 460
 461
 462 def del_oms_attr_request(link: str,):
 463     url = {'rfc8040': '{}/data/ietf-network:networks/network={}/ietf-network-topology:link={}',
 464            'draft-bierman02': '{}/config/ietf-network:networks/network/{}/ietf-network-topology:link/{}'}
 465     url2 = url[RESTCONF_VERSION] + '/org-openroadm-network-topology:OMS-attributes/span'
 466     network = 'openroadm-topology'
 467     response = delete_request(url2.format('{}', network, link))
 468     return response
 469
 470
 471 def del_ietf_network_node_request(network: str, node: str, content: str):
 472     url = {'rfc8040': '{}/data/ietf-network:networks/network={}/node={}?content={}',
 473            'draft-bierman02': '{}/{}/ietf-network:networks/network/{}/node/{}'}
 474     if RESTCONF_VERSION == 'rfc8040':
 475         format_args = ('{}', network, node, content)
 476     elif content == 'config':
 477         format_args = ('{}', content, network, node)
 478     else:
 479         format_args = ('{}', 'operational', network, node)
 480     response = delete_request(url[RESTCONF_VERSION].format(*format_args))
 481     return response
 482
 483 #
 484 # TransportPCE network-utils and service-path operations
 485 #
 486
 487
 488 def prepend_dict_keys(input_dict: dict, prefix: str):
 489     return_dict = {}
 490     for key, value in input_dict.items():
 491         newkey = prefix + key
 492         if isinstance(value, dict):
 493             return_dict[newkey] = prepend_dict_keys(value, prefix)
 494             # TODO: perhaps some recursion depth limit or another solution has to be considered here
 495             # even if recursion depth is given by the input_dict argument
 496             # direct (self-)recursive functions may carry unwanted side-effects such as ressource consumptions
 497         else:
 498             return_dict[newkey] = value
 499     return return_dict
 500
 501
 502 def connect_xpdr_to_rdm_request(payload: dict):
 503     url = "{}/operations/transportpce-networkutils:init-xpdr-rdm-links"
 504     if RESTCONF_VERSION == 'draft-bierman02':
 505         data = prepend_dict_keys({'input': {'links-input': payload}}, 'networkutils:')
 506     else:
 507         data = {'input': {'links-input': payload}}
 508     return post_request(url, data)
 509
 510
 511 def connect_rdm_to_xpdr_request(payload: dict):
 512     url = "{}/operations/transportpce-networkutils:init-rdm-xpdr-links"
 513     if RESTCONF_VERSION == 'draft-bierman02':
 514         data = prepend_dict_keys({'input': {'links-input': payload}}, 'networkutils:')
 515     else:
 516         data = {'input': {'links-input': payload}}
 517     return post_request(url, data)
 518
 519
 520 def device_renderer_service_path_request(payload: dict):
 521     url = "{}/operations/transportpce-device-renderer:service-path"
 522     if RESTCONF_VERSION == 'draft-bierman02':
 523         data = prepend_dict_keys(payload, 'transportpce-device-renderer:')
 524     else:
 525         data = payload
 526     response = post_request(url, data)
 527     res = response.json()
 528     return_key = {'rfc8040': 'transportpce-device-renderer:output',
 529                   'draft-bierman02': 'output'}
 530     return_output = res[return_key[RESTCONF_VERSION]]
 531     return {'status_code': response.status_code,
 532             'output': return_output}
 533
 534
 535 def device_renderer_otn_service_path_request(payload: dict):
 536     url = "{}/operations/transportpce-device-renderer:otn-service-path"
 537     if RESTCONF_VERSION == 'draft-bierman02':
 538         data = prepend_dict_keys(payload, 'transportpce-device-renderer:')
 539     else:
 540         data = payload
 541     response = post_request(url, data)
 542     res = response.json()
 543     return_key = {'rfc8040': 'transportpce-device-renderer:output',
 544                   'draft-bierman02': 'output'}
 545     return_output = res[return_key[RESTCONF_VERSION]]
 546     return {'status_code': response.status_code,
 547             'output': return_output}