new_contents: #!/usr/bin/env python3
  
  # Copyright 2020 The gRPC Authors
  #
  # 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.
  
  # Helper script to extract JSON scenario definitions from scenario_config.py
  
  import json
  import re
  import scenario_config
  import sys
  
  
  def get_json_scenarios(language_name, scenario_name_regex='.*', category='all'):
      """Returns list of scenarios that match given constraints."""
      result = []
      scenarios = scenario_config.LANGUAGES[language_name].scenarios()
      for scenario_json in scenarios:
          if re.search(scenario_name_regex, scenario_json['name']):
              # if the 'CATEGORIES' key is missing, treat scenario as part of 'scalable' and 'smoketest'
              # this matches the behavior of run_performance_tests.py
              scenario_categories = scenario_json.get('CATEGORIES',
                                                      ['scalable', 'smoketest'])
              # TODO(jtattermusch): consider adding filtering for 'CLIENT_LANGUAGE' and 'SERVER_LANGUAGE'
              # fields, before the get stripped away.
              if category in scenario_categories or category == 'all':
                  scenario_json_stripped = scenario_config.remove_nonproto_fields(
                      scenario_json)
                  result.append(scenario_json_stripped)
      return result
  
  
  def dump_to_json_files(json_scenarios, filename_prefix='scenario_dump_'):
      """Dump a list of json scenarios to json files"""
      for scenario in json_scenarios:
          filename = "%s%s.json" % (filename_prefix, scenario['name'])
          print('Writing file %s' % filename, file=sys.stderr)
          with open(filename, 'w') as outfile:
              json.dump(scenario, outfile, indent=2)
  
  
  if __name__ == "__main__":
      # example usage: extract C# scenarios and dump them as .json files
      scenarios = get_json_scenarios('csharp',
                                     scenario_name_regex='.*',
                                     category='scalable')
      dump_to_json_files(scenarios, 'scenario_dump_')
  
subject: add a simple export tool for JSON performance scenarios