def __init__(self):
        self._started = False
        self.server_thread = None
        self.download_threads = {}
        self.uuid_state_dict = None
        self.uuid_map_dict = None
        self.guide_addr = None
        self.server_addr = None
        self.host = None
        self.ctx = None
        self.random_inst = None
        self.master_broadcast_blocks = {}