zte/vmanager/driver/interfaces/views.py

   1 # Copyright 2016-2017 ZTE Corporation.
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #         http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 import inspect
  16 import json
  17 import logging
  18 import traceback
  19 import os
  20
  21 from drf_yasg.utils import swagger_auto_schema
  22 from rest_framework import status
  23 from rest_framework.decorators import api_view
  24 from rest_framework.response import Response
  25 from rest_framework.views import APIView
  26
  27 from driver.interfaces.serializers import HealReqSerializer, HealRespSerializer
  28 from driver.pub.utils import restcall
  29 from driver.pub.utils.restcall import req_by_msb
  30 from driver.pub.config.config import VNF_FTP
  31
  32 logger = logging.getLogger(__name__)
  33
  34
  35 def load_json_file(file_name):
  36     json_file = os.path.join(os.path.dirname(__file__), "data/" + file_name)
  37     f = open(json_file)
  38     json_data = json.JSONDecoder().decode(f.read())
  39     f.close()
  40     return json_data
  41
  42
  43 def fun_name():
  44     return "=================%s==================" % inspect.stack()[1][3]
  45
  46
  47 def ignorcase_get(args, key):
  48     if not key:
  49         return ""
  50     if not args:
  51         return ""
  52     if key in args:
  53         return args[key]
  54     for old_key in args:
  55         if old_key.upper() == key.upper():
  56             return args[old_key]
  57     return ""
  58
  59
  60 def mapping_conv(keyword_map, rest_return):
  61     resp_data = {}
  62     for param in keyword_map:
  63         if keyword_map[param]:
  64             resp_data[keyword_map[param]] = ignorcase_get(rest_return, param)
  65     return resp_data
  66
  67
  68 # Query vnfm_info from nslcm
  69 def get_vnfminfo_from_nslcm(vnfmid):
  70     ret = req_by_msb("api/nslcm/v1/vnfms/%s" % vnfmid, "GET")
  71     return ret
  72
  73
  74 # Query vnfd_info from nslcm
  75 def vnfd_get(vnfpackageid):
  76     ret = req_by_msb("api/nslcm/v1/vnfpackage/%s" % vnfpackageid, "GET")
  77     return ret
  78
  79
  80 # Query vnfpackage_info from nslcm
  81 def vnfpackage_get(csarid):
  82     ret = req_by_msb("api/nslcm/v1/vnfpackage/%s" % csarid, "GET")
  83     return ret
  84
  85
  86 @api_view(http_method_names=['POST'])
  87 def instantiate_vnf(request, *args, **kwargs):
  88     try:
  89         logger.debug("[%s] request.data=%s", fun_name(), request.data)
  90         vnfm_id = ignorcase_get(kwargs, "vnfmid")
  91         ret = get_vnfminfo_from_nslcm(vnfm_id)
  92         if ret[0] != 0:
  93             return Response(data={'error': ret[1]}, status=ret[2])
  94         vnfm_info = json.JSONDecoder().decode(ret[1])
  95         logger.debug("[%s] vnfm_info=%s", fun_name(), vnfm_info)
  96         vnf_package_id = ignorcase_get(request.data, "vnfPackageId")
  97         ret = vnfd_get(vnf_package_id)
  98         if ret[0] != 0:
  99             return Response(data={'error': ret[1]}, status=ret[2])
 100         vnfd_info = json.JSONDecoder().decode(ret[1])
 101         logger.debug("[%s] vnfd_info=%s", fun_name(), vnfd_info)
 102         csar_id = ignorcase_get(vnfd_info, "csarId")
 103         ret = vnfpackage_get(csar_id)
 104         if ret[0] != 0:
 105             return Response(data={'error': ret[1]}, status=ret[2])
 106         vnf_package_info = json.JSONDecoder().decode(ret[1])
 107         packageInfo = ignorcase_get(vnf_package_info, "packageInfo")
 108         logger.debug("[%s] packageInfo=%s", fun_name(), packageInfo)
 109         data = {}
 110         data["NFVOID"] = 1
 111         data["VNFMID"] = vnfm_id
 112         vnfdModel = json.loads(ignorcase_get(packageInfo, "vnfdModel"))
 113         metadata = ignorcase_get(vnfdModel, "metadata")
 114         vnfd_name = ignorcase_get(metadata, "name")
 115         # TODO  convert sdc vnf package to vnf vender package
 116         inputs = []
 117         if "SPGW" in vnfd_name.upper():
 118             data["VNFD"] = VNF_FTP + "SPGW"
 119             inputs = load_json_file("SPGW" + "_inputs.json")
 120         elif "MME" in vnfd_name.upper():
 121             data["VNFD"] = VNF_FTP + "MME"
 122             inputs = load_json_file("MME" + "_inputs.json")
 123         else:
 124             data["VNFD"] = ignorcase_get(packageInfo, "downloadUri")
 125
 126         data["VNFURL"] = data["VNFD"]
 127
 128         data["extension"] = {}
 129         for name, value in ignorcase_get(ignorcase_get(request.data, "additionalParam"), "inputs").items():
 130             inputs.append({"name": name, "value": value})
 131
 132         data["extension"]["inputs"] = json.dumps(inputs)
 133         additionalParam = ignorcase_get(request.data, "additionalParam")
 134         data["extension"]["extVirtualLinks"] = ignorcase_get(additionalParam, "extVirtualLinks")
 135         data["extension"]["vnfinstancename"] = ignorcase_get(request.data, "vnfInstanceName")
 136         data["extension"]["vnfid"] = data["VNFD"]
 137         data["extension"]["multivim"] = 0
 138         logger.debug("[%s] call_req data=%s", fun_name(), data)
 139
 140         ret = restcall.call_req(
 141             base_url=ignorcase_get(vnfm_info, "url"),
 142             user=ignorcase_get(vnfm_info, "userName"),
 143             passwd=ignorcase_get(vnfm_info, "password"),
 144             auth_type=restcall.rest_no_auth,
 145             resource="v1/vnfs",
 146             method='post',
 147             content=json.JSONEncoder().encode(data))
 148
 149         logger.debug("[%s] call_req ret=%s", fun_name(), ret)
 150         if ret[0] != 0:
 151             return Response(data={'error': ret[1]}, status=ret[2])
 152         resp = json.JSONDecoder().decode(ret[1])
 153         resp_data = {
 154             "vnfInstanceId": ignorcase_get(resp, "VNFInstanceID"),
 155             "jobId": ignorcase_get(resp, "JobId")
 156         }
 157         logger.info("[%s]resp_data=%s", fun_name(), resp_data)
 158     except Exception as e:
 159         logger.error("Error occurred when instantiating VNF")
 160         raise e
 161     return Response(data=resp_data, status=ret[2])
 162
 163
 164 @api_view(http_method_names=['POST'])
 165 def terminate_vnf(request, *args, **kwargs):
 166     try:
 167         logger.debug("[%s] request.data=%s", fun_name(), request.data)
 168         vnfm_id = ignorcase_get(kwargs, "vnfmid")
 169         ret = get_vnfminfo_from_nslcm(vnfm_id)
 170         if ret[0] != 0:
 171             return Response(data={'error': ret[1]}, status=ret[2])
 172         vnfm_info = json.JSONDecoder().decode(ret[1])
 173         logger.debug("[%s] vnfm_info=%s", fun_name(), vnfm_info)
 174         ret = restcall.call_req(
 175             base_url=ignorcase_get(vnfm_info, "url"),
 176             user=ignorcase_get(vnfm_info, "userName"),
 177             passwd=ignorcase_get(vnfm_info, "password"),
 178             auth_type=restcall.rest_no_auth,
 179             resource="v1/vnfs/%s" % (ignorcase_get(kwargs, "vnfInstanceID")),
 180             method='delete',
 181             content=json.JSONEncoder().encode(request.data))
 182         if ret[0] != 0:
 183             return Response(data={'error': ret[1]}, status=ret[2])
 184         resp = json.JSONDecoder().decode(ret[1])
 185         resp_data = {
 186             "vnfInstanceId": ignorcase_get(resp, "VNFInstanceID"),
 187             "jobId": ignorcase_get(resp, "JobId")
 188         }
 189         logger.debug("[%s]resp_data=%s", fun_name(), resp_data)
 190     except Exception as e:
 191         logger.error("Error occurred when terminating VNF")
 192         raise e
 193     return Response(data=resp_data, status=ret[2])
 194
 195
 196 @api_view(http_method_names=['GET'])
 197 def query_vnf(request, *args, **kwargs):
 198     try:
 199         logger.debug("[%s] request.data=%s", fun_name(), request.data)
 200         vnfm_id = ignorcase_get(kwargs, "vnfmid")
 201         ret = get_vnfminfo_from_nslcm(vnfm_id)
 202         if ret[0] != 0:
 203             return Response(data={'error': ret[1]}, status=ret[2])
 204         vnfm_info = json.JSONDecoder().decode(ret[1])
 205         logger.debug("[%s] vnfm_info=%s", fun_name(), vnfm_info)
 206         ret = restcall.call_req(
 207             base_url=ignorcase_get(vnfm_info, "url"),
 208             user=ignorcase_get(vnfm_info, "userName"),
 209             passwd=ignorcase_get(vnfm_info, "password"),
 210             auth_type=restcall.rest_no_auth,
 211             resource="v1/vnfs/%s" % (ignorcase_get(kwargs, "vnfInstanceID")),
 212             method='get',
 213             content=json.JSONEncoder().encode({}))
 214         if ret[0] != 0:
 215             return Response(data={'error': ret[1]}, status=ret[2])
 216         resp = json.JSONDecoder().decode(ret[1])
 217         vnf_status = ignorcase_get(resp, "vnfinstancestatus")
 218         resp_data = {"vnfInfo": {"vnfStatus": vnf_status}}
 219         logger.debug("[%s]resp_data=%s", fun_name(), resp_data)
 220     except Exception as e:
 221         logger.error("Error occurred when querying VNF information.")
 222         raise e
 223     return Response(data=resp_data, status=ret[2])
 224
 225
 226 @api_view(http_method_names=['GET'])
 227 def operation_status(request, *args, **kwargs):
 228     data = {}
 229     try:
 230         logger.debug("[%s] request.data=%s", fun_name(), request.data)
 231         vnfm_id = ignorcase_get(kwargs, "vnfmid")
 232         ret = get_vnfminfo_from_nslcm(vnfm_id)
 233         if ret[0] != 0:
 234             return Response(data={'error': ret[1]}, status=ret[2])
 235         vnfm_info = json.JSONDecoder().decode(ret[1])
 236         logger.debug("[%s] vnfm_info=%s", fun_name(), vnfm_info)
 237         operation_status_url = '/v1/jobs/{jobId}?NFVOID={nfvoId}&VNFMID={vnfmId}&ResponseID={responseId}'
 238         ret = restcall.call_req(
 239             base_url=ignorcase_get(vnfm_info, 'url'),
 240             user=ignorcase_get(vnfm_info, 'userName'),
 241             passwd=ignorcase_get(vnfm_info, 'password'),
 242             auth_type=restcall.rest_no_auth,
 243             resource=operation_status_url.format(jobId=ignorcase_get(kwargs, 'jobid'), nfvoId=1,
 244                                                  vnfmId=ignorcase_get(kwargs, 'vnfmid'),
 245                                                  responseId=ignorcase_get(request.GET, 'responseId')),
 246             method='get',
 247             content=json.JSONEncoder().encode(data))
 248
 249         if ret[0] != 0:
 250             return Response(data={'error': ret[1]}, status=ret[2])
 251         resp_data = json.JSONDecoder().decode(ret[1])
 252         logger.info("[%s]resp_data=%s", fun_name(), resp_data)
 253     except Exception as e:
 254         logger.error("Error occurred when getting operation status information.")
 255         raise e
 256     return Response(data=resp_data, status=ret[2])
 257
 258
 259 @api_view(http_method_names=['PUT'])
 260 def grantvnf(request, *args, **kwargs):
 261     logger.info("=====grantvnf=====")
 262     try:
 263         logger.info("req_data = %s", request.data)
 264         grant_vnf_param_map = {
 265             "VNFMID": "",
 266             "NFVOID": "",
 267             "VIMID": "",
 268             "ExVIMIDList": "",
 269             "ExVIMID": "",
 270             "Tenant": "",
 271             "VNFInstanceID": "vnfInstanceId",
 272             "OperationRight": "",
 273             "VMList": "",
 274             "VMFlavor": "",
 275             "VMNumber": ""
 276         }
 277         data = mapping_conv(grant_vnf_param_map, request.data)
 278         data["vnfDescriptorId"] = ""
 279         if ignorcase_get(request.data, "operationright") == 0:
 280             data["lifecycleOperation"] = "Instantiate"
 281             data["addresource"] = []
 282             for vm in ignorcase_get(request.data, "vmlist"):
 283                 for i in range(int(ignorcase_get(vm, "vmnumber"))):
 284                     data["addresource"].append(
 285                         {
 286                             "type": "vdu",
 287                             "resourceDefinitionId": i,
 288                             "vdu": ignorcase_get(vm, "vmflavor"),
 289                             "vimid": ignorcase_get(vm, "vimid"),
 290                             "tenant": ignorcase_get(vm, "tenant")})
 291
 292         data["additionalparam"] = {}
 293         data["additionalparam"]["vnfmid"] = ignorcase_get(request.data, "vnfmid")
 294         data["additionalparam"]["vimid"] = ignorcase_get(request.data, "vimid")
 295         data["additionalparam"]["tenant"] = ignorcase_get(request.data, "tenant")
 296
 297         ret = req_by_msb('api/nslcm/v1/ns/grantvnf', "POST", content=json.JSONEncoder().encode(data))
 298         logger.info("ret = %s", ret)
 299         if ret[0] != 0:
 300             return Response(data={'error': ret[1]}, status=ret[2])
 301         resp = json.JSONDecoder().decode(ret[1])
 302         resp_data = {
 303             'vimid': ignorcase_get(resp['vim'], 'vimid'),
 304             'tenant': ignorcase_get(ignorcase_get(resp['vim'], 'accessinfo'), 'tenant')
 305         }
 306         logger.info("[%s]resp_data=%s", fun_name(), resp_data)
 307     except Exception as e:
 308         logger.error("Error occurred in Grant VNF.")
 309         raise e
 310     return Response(data=resp_data, status=ret[2])
 311
 312
 313 @api_view(http_method_names=['POST'])
 314 def notify(request, *args, **kwargs):
 315     try:
 316         logger.info("[%s]req_data = %s", fun_name(), request.data)
 317         notify_param_map = {
 318             "NFVOID": "",
 319             "VNFMID": "VNFMID",
 320             "VIMID": "vimid",
 321             "VNFInstanceID": "vnfInstanceId",
 322             "TimeStamp": "",
 323             "EventType": "operation",
 324             "VMList": "",
 325             "VMFlavor": "",
 326             "VMNumber": "",
 327             "VMIDlist": "",
 328             "VMUUID": ""
 329         }
 330         data = mapping_conv(notify_param_map, request.data)
 331         logger.info("[%s]data = %s", fun_name(), data)
 332
 333         data["status"] = "result"
 334         data["jobId"] = "notMust"
 335         data["affectedVnfc"] = []
 336         data["affectedVl"] = []
 337         data["affectedVirtualStorage"] = []
 338         data["affectedCp"] = []
 339
 340         extension = ignorcase_get(request.data, "extension")
 341         openo_notification = ignorcase_get(extension, "openo_notification")
 342         if openo_notification:
 343             affectedvnfcs = ignorcase_get(openo_notification, "affectedVnfc")
 344             affectedvls = ignorcase_get(openo_notification, "affectedvirtuallink")
 345             affectedcps = ignorcase_get(openo_notification, "affectedCp")
 346             vnfdmodule = ignorcase_get(openo_notification, "vnfdmodule")
 347         else:
 348             affectedvnfcs = ignorcase_get(ignorcase_get(request.data, "extension"), "affectedvnfc")
 349             affectedvls = ignorcase_get(ignorcase_get(request.data, "extension"), "affectedvl")
 350             affectedcps = ignorcase_get(ignorcase_get(request.data, "extension"), "affectedcp")
 351             vnfdmodule = ignorcase_get(ignorcase_get(request.data, "extension"), "vnfdmodule")
 352
 353         data["vnfdmodule"] = vnfdmodule
 354
 355         for affectedvnfc in affectedvnfcs:
 356             data["affectedVnfc"].append({
 357                 "vnfcInstanceId": ignorcase_get(affectedvnfc, "vnfcInstanceId"),
 358                 "vduId": ignorcase_get(affectedvnfc, "vduId"),
 359                 "changeType": ignorcase_get(affectedvnfc, "changeType"),
 360                 "vimId": ignorcase_get(ignorcase_get(affectedvnfc, "computeResource"), "vimId"),
 361                 "vmId": ignorcase_get(ignorcase_get(affectedvnfc, "computeResource"), "resourceId"),
 362                 "vmName": ignorcase_get(ignorcase_get(affectedvnfc, "computeResource"), "resourceName")
 363             })
 364
 365         for affectedvl in affectedvls:
 366             data["affectedVl"].append({
 367                 "vlInstanceId": ignorcase_get(affectedvl, "virtualLinkInstanceId"),
 368                 "changeType": ignorcase_get(affectedvl, "changeType"),
 369                 "vimId": ignorcase_get(ignorcase_get(affectedvl, "networkResource"), "vimId"),
 370                 "vldId": ignorcase_get(affectedvl, "virtuallinkdescid"),
 371                 "networkResource": {
 372                     "resourceType": "network",
 373                     "resourceId": ignorcase_get(ignorcase_get(affectedvl, "networkresource"), "resourceid"),
 374                     "resourceName": ignorcase_get(ignorcase_get(affectedvl, "networkresource"), "resourcename")
 375                 }
 376             })
 377
 378         for affectedcp in affectedcps:
 379             data["affectedCp"].append(affectedcp)
 380
 381         notify_url = 'api/nslcm/v1/ns/{vnfmid}/vnfs/{vnfInstanceId}/Notify'
 382         ret = req_by_msb(notify_url.format(vnfmid=ignorcase_get(data, 'VNFMID'),
 383                                            vnfInstanceId=ignorcase_get(data, 'vnfinstanceid')),
 384                          "POST", content=json.JSONEncoder().encode(data))
 385
 386         logger.info("[%s]data = %s", fun_name(), ret)
 387         if ret[0] != 0:
 388             return Response(data={'error': ret[1]}, status=ret[2])
 389     except Exception as e:
 390         logger.error("Error occurred in LCM notification.")
 391         logger.error(traceback.format_exc())
 392         raise e
 393     return Response(data=None, status=ret[2])
 394
 395
 396 @api_view(http_method_names=['POST'])
 397 def scale(request, *args, **kwargs):
 398     logger.info("====scale_vnf===")
 399     try:
 400         logger.info("request.data = %s", request.data)
 401         logger.info("requested_url = %s", request.get_full_path())
 402         vnfm_id = ignorcase_get(kwargs, "vnfmid")
 403         nf_instance_id = ignorcase_get(kwargs, "vnfInstanceId")
 404         ret = get_vnfminfo_from_nslcm(vnfm_id)
 405         if ret[0] != 0:
 406             return Response(data={'error': ret[1]}, status=ret[2])
 407         vnfm_info = json.JSONDecoder().decode(ret[1])
 408         scale_type = ignorcase_get(request.data, "type")
 409         aspect_id = ignorcase_get(request.data, "aspectId")
 410         number_of_steps = ignorcase_get(request.data, "numberOfSteps")
 411         data = {
 412             'vnfmid': vnfm_id,
 413             'nfvoid': 1,
 414             'scaletype': '0' if scale_type == 'SCALE_OUT' else '1',
 415             'vmlist': [{'VMNumber': number_of_steps, 'VMFlavor': aspect_id}],
 416             'extension': ''
 417         }
 418
 419         logger.info("data = %s", data)
 420         ret = restcall.call_req(
 421             base_url=ignorcase_get(vnfm_info, "url"),
 422             user=ignorcase_get(vnfm_info, "userName"),
 423             passwd=ignorcase_get(vnfm_info, "password"),
 424             auth_type=restcall.rest_no_auth,
 425             resource='/v1/vnfs/{vnfInstanceID}/scale'.format(vnfInstanceID=nf_instance_id),
 426             method='put',  # POST
 427             content=json.JSONEncoder().encode(data))
 428         logger.info("ret=%s", ret)
 429         if ret[0] != 0:
 430             return Response(data={'error': 'scale error'}, status=ret[2])
 431         resp_data = json.JSONDecoder().decode(ret[1])
 432         logger.info("resp_data=%s", resp_data)
 433     except Exception as e:
 434         logger.error("Error occurred when scaling VNF,error:%s", e.message)
 435         logger.error(traceback.format_exc())
 436         return Response(data={'error': 'scale expection'}, status='500')
 437     return Response(data=resp_data, status=ret[2])
 438
 439
 440 class Heal(APIView):
 441     @swagger_auto_schema(
 442         request_body=HealReqSerializer(),
 443         responses={
 444             status.HTTP_202_ACCEPTED: HealRespSerializer(),
 445             status.HTTP_500_INTERNAL_SERVER_ERROR: "Internal error"
 446         }
 447     )
 448     def post(self, request, vnfmid, vnfInstanceId):
 449         logger.info("====heal_vnf===")
 450         try:
 451             logger.info("request.data = %s", request.data)
 452             logger.info("requested_url = %s", request.get_full_path())
 453             healReqSerializer = HealReqSerializer(data=request.data)
 454             if not healReqSerializer.is_valid():
 455                 raise Exception(healReqSerializer.errors)
 456
 457             ret = get_vnfminfo_from_nslcm(vnfmid)
 458             if ret[0] != 0:
 459                 return Response(data={'error': ret[1]}, status=ret[2])
 460             vnfm_info = json.JSONDecoder().decode(ret[1])
 461             data = {}
 462             data['action'] = ignorcase_get(healReqSerializer.data, 'action')
 463             affectedvm = ignorcase_get(healReqSerializer.data, 'affectedvm')
 464             data['affectedvm'] = []
 465             if isinstance(affectedvm, list):
 466                 data['affectedvm'] = affectedvm
 467             else:
 468                 data['affectedvm'].append(affectedvm)
 469             data['lifecycleoperation'] = 'operate'
 470             data['isgrace'] = 'force'
 471
 472             logger.info("data = %s", data)
 473             ret = restcall.call_req(
 474                 base_url=ignorcase_get(vnfm_info, "url"),
 475                 user=ignorcase_get(vnfm_info, "userName"),
 476                 passwd=ignorcase_get(vnfm_info, "password"),
 477                 auth_type=restcall.rest_no_auth,
 478                 resource='/api/v1/nf_m_i/nfs/{vnfInstanceID}/vms/operation'.format(vnfInstanceID=vnfInstanceId),
 479                 method='post',
 480                 content=json.JSONEncoder().encode(data))
 481             logger.info("ret=%s", ret)
 482             if ret[0] != 0:
 483                 raise Exception('heal error')
 484             resp_data = json.JSONDecoder().decode(ret[1])
 485             logger.info("resp_data=%s", resp_data)
 486             healRespSerializer = HealRespSerializer(data=resp_data)
 487             if not healRespSerializer.is_valid():
 488                 raise Exception(healRespSerializer.errors)
 489
 490             return Response(data=healRespSerializer.data, status=status.HTTP_202_ACCEPTED)
 491         except Exception as e:
 492             logger.error("Error occurred when healing VNF,error:%s", e.message)
 493             logger.error(traceback.format_exc())
 494             return Response(data={'error': 'heal expection'}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
 495
 496
 497 def get_vdus(nf_model, aspect_id):
 498     associated_group = ''
 499     members = []
 500     vnf_flavours = nf_model['vnf_flavours']
 501     for vnf_flaour in vnf_flavours:
 502         scaling_aspects = vnf_flaour['scaling_aspects']
 503         for aspect in scaling_aspects:
 504             if aspect_id == aspect['id']:
 505                 associated_group = aspect['associated_group']
 506                 break
 507     if not associated_group:
 508         logger.error('Cannot find the corresponding element group')
 509         raise Exception('Cannot find the corresponding element group')
 510     for element_group in nf_model['element_groups']:
 511         if element_group['group_id'] == associated_group:
 512             members = element_group['members']
 513     if not members:
 514         logger.error('Cannot find the corresponding members')
 515         raise Exception('Cannot find the corresponding members')
 516     return members
 517
 518
 519 @api_view(http_method_names=['GET'])
 520 def samples(request, *args, **kwargs):
 521     return Response(data={"status": "ok"})