code: def broadcast_channel(message, channel):
      
      try:
          socket = CLIENTS[CHANNELS.get(channel, [])[0]][1]
      except (IndexError, KeyError):
          raise NoSocket("There are no clients on the channel: " + channel)
      socket.send_and_broadcast_channel(message, channel)
docs: Find the first socket for the given channel, and use it to
      broadcast to the channel, including the socket itself.