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# Copyright (C) 2013-2014 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Blake Rouse <blake.rouse@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

import abc
import io
from typing import Optional

from cloudinit.net.network_state import NetworkState
from cloudinit.net.udev import generate_udev_rule


def filter_by_type(match_type):
    return lambda iface: match_type == iface["type"]


def filter_by_attr(match_name):
    return lambda iface: (match_name in iface and iface[match_name])


filter_by_physical = filter_by_type("physical")


class Renderer(abc.ABC):
    def __init__(self, config=None):
        pass

    @staticmethod
    def _render_persistent_net(network_state: NetworkState):
        """Given state, emit udev rules to map mac to ifname."""
        # TODO(harlowja): this seems shared between eni renderer and
        # this, so move it to a shared location.
        content = io.StringIO()
        for iface in network_state.iter_interfaces(filter_by_physical):
            # for physical interfaces write out a persist net udev rule
            if "name" in iface and iface.get("mac_address"):
                driver = iface.get("driver", None)
                content.write(
                    generate_udev_rule(
                        ifa