class MyMessage(object):
    """
        message type definition
    """
    # server to client
    MSG_TYPE_S2C_GRADS = 1

    # client to server
    MSG_TYPE_C2S_SEND_ACTS = 2
    MSG_TYPE_C2S_VALIDATION_MODE = 3
    MSG_TYPE_C2S_VALIDATION_OVER = 4
    MSG_TYPE_C2S_PROTOCOL_FINISHED = 5

    # client to client
    MSG_TYPE_C2C_SEMAPHORE = 6

    MSG_ARG_KEY_TYPE = "msg_type"
    MSG_ARG_KEY_SENDER = "sender"
    MSG_ARG_KEY_RECEIVER = "receiver"

    """
        message payload keywords definition
    """
    MSG_ARG_KEY_ACTS = "activations"
    MSG_ARG_KEY_GRADS = "activation_grads"
