old_contents: #
  
new_contents: """retools
  
  This module holds a default Redis instance, which can be
  configured process-wide::
      
      from retools import Connection
      
      Connection.set_default(host='127.0.0.1', db=0, **kwargs)
  
  """
  from redis import Redis
  
  from retools.redconn import Connection
  
  __all__ = ['Connection']
  
  
  class Connection(object):
      redis = None
      
      @classmethod
      def set_default(cls, host='localhost', port=6379, db=0, password=None):
          Connection.redis = Redis(host=host, port=port, db=db,
                                   password=password)
  
      @classmethod
      def get_default(cls):
          return Connection.redis
  
subject: Update global lock, default connection