code: func (s *ChainService) OutboundGroupCount(key string) int {
  	replyChan := make(chan int)
  
  	select {
  	case s.query <- getOutboundGroup{key: key, reply: replyChan}:
  		return <-replyChan
  	case <-s.quit:
  		return 0
  	}
  }
docs: // OutboundGroupCount returns the number of peers connected to the given
  // outbound group key.