text: # -------------------------------------------------------------------------
  #   Copyright (C) 2020 Wipro Limited.
  #
  #   Licensed under the Apache License, Version 2.0 (the "License");
  #   you may not use this file except in compliance with the License.
  #   You may obtain a copy of the License at
  #
  #       http://www.apache.org/licenses/LICENSE-2.0
  #
  #   Unless required by applicable law or agreed to in writing, software
  #   distributed under the License is distributed on an "AS IS" BASIS,
  #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #   See the License for the specific language governing permissions and
  #   limitations under the License.
  #
  # -------------------------------------------------------------------------
  #
  
  import requests
  
  from osdf.config.base import osdf_config
  from osdf.utils.interfaces import RestClient
  
  
  class DESException(Exception):
      pass
  
  
  def extract_data(service_id, request_data):
      """Extracts data from the data lake via DES.
  
      param: service_id: kpi data identifier
      param: request_data: data to send
      param: osdf_config: osdf config to retrieve api info
      """
  
      config = osdf_config.deployment
      user, password = config['desUsername'], config['desPassword']
      headers = config["desHeaders"]
      req_url = config["desUrl"] + config["desApiPath"] + service_id
      rc = RestClient(userid=user, passwd=password, url=req_url, headers=headers, method="POST")
  
      try:
          response_json = rc.request(data=request_data)
          return response_json.get("result")
      except requests.RequestException as e:
          raise DESException("Request exception was encountered {}".format(e))
  