send and receive service message using rosbridge

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Hello,

I'm using rosbridge 2.0 to connect to a remote computer and call a ROS service on the remote machine. I'm using the sample client below (from the the rosbride website) to make the connection and call the service:

  from json import dumps
  from ws4py.client.threadedclient import WebSocketClient

  class GetLoggersClient(WebSocketClient):

       def get_loggers(self):
           msg = {'op': 'call_service', 'service': '/rosout/get_loggers'}
           self.send(dumps(msg))

       def opened(self):
           print "Connection opened..."
           self.get_loggers()

       def closed(self, code, reason=None):
           print code, reason

       def received_message(self, m):
           print "Received:", m

  if __name__=="__main__":
       try:
           ws = GetLoggersClient('ws://127.0.0.1:9090/')
           ws.connect()
       except KeyboardInterrupt:
           ws.close()

My question is how I can receive the output message of the service call. The output message is printed in the console by received_message(self,m), but I intend to assign this output to a variable.

Thanks