import_multipath.py

#!/usr/bin/python3

import threading
import os
import random
import time
import heapq

from collections import defaultdict
from operator import itemgetter
from dataclasses import dataclass

from ryu.base import app_manager
from ryu.controller import mac_to_port
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.lib.mac import haddr_to_bin
from ryu.lib.packet import packet
from ryu.lib.packet import arp
from ryu.lib.packet import ethernet
from ryu.lib.packet import ipv4
from ryu.lib.packet import ipv6
from ryu.lib.packet import ether_types
from ryu.lib.packet import udp
from ryu.lib.packet import tcp
from ryu.lib import mac, ip
from ryu.lib import hub
from ryu.ofproto import inet
from ryu.topology.api import get_switch, get_link, get_host
from ryu.app.wsgi import ControllerBase
from ryu.topology import event, switches