text: #!/usr/bin/env python
  
  # Copyright (c) 2015 Rackspace, Inc.
  #
  # 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.
  
  """
  Barbican worker server, running a periodic retry/scheduler process.
  """
  
  import eventlet
  import os
  import sys
  
  # Oslo messaging RPC server uses eventlet.
  eventlet.monkey_patch()
  # Monkey patch the original current_thread to use the up-to-date _active
  # global variable. See https://bugs.launchpad.net/bugs/1863021 and
  # https://github.com/eventlet/eventlet/issues/592
  import __original_module_threading as orig_threading
  import threading  # noqa
  orig_threading.current_thread.__globals__['_active'] = threading._active
  
  # 'Borrowed' from the Glance project:
  # If ../barbican/__init__.py exists, add ../ to Python search path, so that
  # it will override what happens to be installed in /usr/(local/)lib/python...
  possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                     os.pardir,
                                     os.pardir))
  if os.path.exists(os.path.join(possible_topdir, 'barbican', '__init__.py')):
      sys.path.insert(0, possible_topdir)
  
  
  from barbican.common import config
  from barbican import queue
  from barbican.queue import retry_scheduler
  from barbican import version
  
  from oslo_log import log
  from oslo_service import service
  
  
  def fail(returncode, e):
      sys.stderr.write("ERROR: {0}\n".format(e))
      sys.exit(returncode)
  
  
  def main():
      try:
          CONF = config.CONF
          CONF(sys.argv[1:], project='barbican',
               version=version.version_info.version_string)
  
          # Import and configure logging.
          log.setup(CONF, 'barbican-retry-scheduler')
          LOG = log.getLogger(__name__)
          LOG.debug("Booting up Barbican worker retry/scheduler node...")
  
          # Queuing initialization (as a client only).
          queue.init(CONF, is_server_side=False)
  
          service.launch(
              CONF,
              retry_scheduler.PeriodicServer(),
              restart_method='mutate'
          ).wait()
      except RuntimeError as e:
          fail(1, e)
  
  
  if __name__ == '__main__':
      main()
  