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"""Module with identifier types for Links and Interfaces"""
import hashlib
from typing import Tuple
class InterfaceID(str):
"""Interface Identifier"""
__slots__ = ("switch", "port")
def __new__(cls, switch: str, port: int):
return super().__new__(cls, f"{switch}:{port}")
def __init__(self, switch: str, port: int):
# Used for sorting, but can be accessed
self.switch = switch
self.port = port
super().__init__()
def __lt__(self, other):
# Ensures that instances are sortable in a way that maintains backwards
# compatibility when creating instances of LinkID
dpid_a = self.switch
port_a = self.port
dpid_b = other.switch
port_b = other.port
if dpid_a < dpid_b:
return True
return dpid_a == dpid_b and port_a < port_b
class LinkID(str):
"""Link Identifier"""
def __new__(cls, interface_1: str, interface_2: str):
intf_1 = InterfaceID(*LinkID.intf_id_to_tuple(interface_1))
intf_2 = InterfaceID(*LinkID.intf_id_to_tuple(interface_2))
raw_str = ":".join(sorted((intf_1, intf_2)))
digest = hashlib.sha256(raw_str.encode('utf-8')).hexdigest()
return super().__new__(cls, digest)
@staticmethod
def intf_id_to_tuple(interface_id: str) -> Tuple[str, int]:
"""Map interface id as a switch, port tuple."""
values = interface_id.split(":")
switch_id = ":".join(values[:-1])
port = int(values[-1])
return switch_id, port
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