text: #!/usr/bin/python
  # Copyright (c) 2009 Las Cumbres Observatory (www.lcogt.net)
  # Copyright (c) 2010 Jan Dittberner
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  
  import google.protobuf.service as service
  
  class SocketRpcController(service.RpcController):
      ''' RpcController implementation to be used by the SocketRpcChannel class.
      The RpcController is used to mediate a single method call.
      '''
  
      def __init__(self):
          '''Constructor which initializes the controller's state.'''
          self._fail = False
          self._error = None
          self.reason = None
  
      def handleError(self, error_code, message):
          '''Log and set the controller state.'''
          self._fail = True
          self.reason = error_code
          self._error = message
  
      def reset(self):
          '''Resets the controller i.e. clears the error state.'''
          self._fail = False
          self._error = None
          self.reason = None
  
      def failed(self):
          '''Returns True if the controller is in a failed state.'''
          return self._fail
  
      def error(self):
          return self._error
  