text: #   =======================================================================
  #
  # Copyright (C) 2018, Hisilicon Technologies Co., Ltd. All Rights Reserved.
  #
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  #
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  #     this list of conditions and the following disclaimer.
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  #   2 Redistributions in binary form must reproduce the above copyright notice,
  #     this list of conditions and the following disclaimer in the documentation
  #     and/or other materials provided with the distribution.
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  #   contributors may be used to endorse or promote products derived from this
  #   software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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  # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  #   =======================================================================
  #
  
  """Car RecognitionServer config parser module"""
  
  import os
  import configparser
  import common.parameter_validation as validate
  
  class ConfigParser():
      """ parse configuration from the config.conf"""
      __instance = None
  
      def __init__(self):
          """init"""
  
      def __new__(cls):
          """ensure class object is a single instance"""
          if cls.__instance is None:
              cls.__instance = object.__new__(cls)
              cls.config_parser()
          return cls.__instance
  
      def config_verify(self):
          '''Verify configuration Parameters '''
          if not validate.validate_ip(ConfigParser.web_server_ip) or \
             not validate.validate_ip(ConfigParser.presenter_server_ip) or \
             not validate.validate_port(ConfigParser.web_server_port) or \
             not validate.validate_port(ConfigParser.presenter_server_port):
              return False
          return True
  
      @classmethod
      def config_parser(cls):
          """parser config from config.conf"""
          config_parser = configparser.ConfigParser()
          cls.root_path = ConfigParser.get_rootpath()
          config_file = os.path.join(cls.root_path, "config/config.conf")
          config_parser.read(config_file)
          cls.web_server_ip = config_parser.get('baseconf', 'web_server_ip')
          cls.presenter_server_ip = \
              config_parser.get('baseconf', 'presenter_server_ip')
          cls.web_server_port = config_parser.get('baseconf', 'web_server_port')
          cls.presenter_server_port = \
              config_parser.get('baseconf', 'presenter_server_port')
  
  
      @staticmethod
      def get_rootpath():
          """get presenter server's root directory."""
          path = __file__
          idx = path.rfind("src")
  
          return path[0:idx]
  