text: # Copyright 2018 Google LLC
  #
  # 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 json
  import shlex
  import subprocess
  
  import six
  
  
  class CommandException(Exception):
  
    def __init__(self, exitcode, message):
      self._exitcode = exitcode
      super(Exception, self).__init__(message)
  
    @property
    def exitcode(self):
      return self._exitcode
  
  
  class Command:
    """Wrapper around subprocess for simpler syntax in python code for calling other programs"""
  
    def __init__(self, cmd, print_call=False, print_result=False):
      if print_call:
        print(cmd)
  
      parsedCmd = shlex.split(cmd)
      self._process = subprocess.Popen(
          parsedCmd, stdin=None, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
      self._exitcode = None
      self._output = None
      self._print_call = print_call
      self._print_result = print_result
      self._run()
  
    def _run(self):
      self._output, error_message = self._process.communicate()
      self._output = six.ensure_str(self._output, 'utf-8')
      error_message = six.ensure_str(error_message, 'utf-8')
      self._exitcode = self._process.returncode
      if self._print_result:
        print("result: " + str((self._exitcode, self._output, error_message)))
  
      if self._exitcode > 0:
        raise CommandException(self._exitcode, error_message)
  
    def json(self):
      return json.loads(self._output)
  
    @property
    def exitcode(self):
      return self._exitcode
  
    @property
    def output(self):
      return self._output
  