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# Copyright 2016, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from typing import NamedTuple, Optional
from ..policyrep import Context, Netifcon
from .context import ContextWrapper
from .descriptors import DiffResultDescriptor
from .difference import Difference, Wrapper
class ModifiedNetifcon(NamedTuple):
"""Difference details for a modified netifcon."""
rule: Netifcon
added_context: Optional[Context]
removed_context: Optional[Context]
added_packet: Optional[Context]
removed_packet: Optional[Context]
class NetifconsDifference(Difference):
"""Determine the difference in netifcons between two policies."""
added_netifcons = DiffResultDescriptor("diff_netifcons")
removed_netifcons = DiffResultDescriptor("diff_netifcons")
modified_netifcons = DiffResultDescriptor("diff_netifcons")
def diff_netifcons(self) -> None:
"""Generate the difference in netifcons between the policies."""
self.log.info("Generating netifcon differences from {0.left_policy} to {0.right_policy}".
format(self))
self.added_netifcons, self.removed_netifcons, matched_netifcons = self._set_diff(
(NetifconWrapper(n) for n in self.left_policy.netifcons()),
(NetifconWrapper(n) for n in self.right_policy.netifcons()))
self.modified_netifcons = []
for left_netifcon, right_netifcon in matched_netifcons:
# Criteria for modified netifcons
# 1. change to context
# 2. change to packet context
if ContextWrapper(left_netifcon.context) != ContextWrapper(right_netifcon.context):
removed_context = left_netifcon.context
added_context = right_netifcon.context
else:
removed_context = None
added_context = None
if ContextWrapper(left_netifcon.packet) != ContextWrapper(right_netifcon.packet):
removed_packet = left_netifcon.packet
added_packet = right_netifcon.packet
else:
removed_packet = None
added_packet = None
if removed_context or removed_packet:
self.modified_netifcons.append(ModifiedNetifcon(
left_netifcon, added_context, removed_context, added_packet, removed_packet))
#
# Internal functions
#
def _reset_diff(self) -> None:
"""Reset diff results on policy changes."""
self.log.debug("Resetting netifcon differences")
self.added_netifcons = None
self.removed_netifcons = None
self.modified_netifcons = None
class NetifconWrapper(Wrapper[Netifcon]):
"""Wrap netifcon statements for diff purposes."""
__slots__ = ("netif")
def __init__(self, ocon: Netifcon) -> None:
self.origin = ocon
self.netif = ocon.netif
self.key = hash(ocon)
def __hash__(self):
return self.key
def __lt__(self, other):
return self.netif < other.netif
def __eq__(self, other):
return self.netif == other.netif