new_contents: #!/usr/bin/env python
  
  # Copyright (C) 2014-2016 Nippon Telegraph and Telephone Corporation.
  #
  # 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 time
  import json
  from lagosh import ds_client
  from datetime import datetime
  
  sec = 60
  exit_loop = False
  subcmd = 'flow'
  
  while exit_loop != True:
  
    log = {}
    log['@timestamp'] = datetime.now().isoformat()
    log['flows'] = ds_client().call(subcmd + '\n')
  
    print json.dumps(log)
    time.sleep(sec)
  
subject: add flowstats_logger.py