path: root/resources/libraries/python/honeycomb/HcAPIKwInterfaces.py

# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Keywords to manipulate interface configuration using Honeycomb REST API.

The keywords make possible to put and get configuration data and to get
operational data.
"""
from robot.api import logger

from resources.libraries.python.topology import Topology
from resources.libraries.python.HTTPRequest import HTTPCodes
from resources.libraries.python.honeycomb.HoneycombSetup import HoneycombError
from resources.libraries.python.honeycomb.HoneycombUtil \
    import DataRepresentation
from resources.libraries.python.honeycomb.HoneycombUtil \
    import HoneycombUtil as HcUtil


class InterfaceKeywords(object):
    """Keywords for Interface manipulation.

    Implements keywords which get configuration and operational data about
    vpp interfaces and set the interface's parameters using Honeycomb REST API.
    """

    INTF_PARAMS = ("name", "description", "type", "enabled",
                   "link-up-down-trap-enable", "v3po:l2", "v3po:vxlan-gpe",
                   "vpp-vlan:sub-interfaces")
    IPV4_PARAMS = ("enabled", "forwarding", "mtu")
    IPV6_PARAMS = ("enabled", "forwarding", "mtu", "dup-addr-detect-transmits")
    IPV6_AUTOCONF_PARAMS = ("create-global-addresses",
                            "create-temporary-addresses",
                            "temporary-valid-lifetime",
                            "temporary-preferred-lifetime")
    ETH_PARAMS = ("mtu", )
    ROUTING_PARAMS = ("vrf-id", )
    VXLAN_PARAMS = ("src", "dst", "vni", "encap-vrf-id")
    L2_PARAMS = ("bridge-domain", "split-horizon-group",
                 "bridged-virtual-interface")
    TAP_PARAMS = ("tap-name", "mac", "device-instance")
    VHOST_USER_PARAMS = ("socket", "role")
    SUB_IF_PARAMS = ("identifier",
                     "vlan-type",
                     "enabled")
    SUB_IF_MATCH = ("default",
                    "untagged",
                    "vlan-tagged",
                    "vlan-tagged-exact-match")
    BD_PARAMS = ("bridge-domain",
                 "split-horizon-group",
                 "bridged-virtual-interface")
    VXLAN_GPE_PARAMS = ("local",
                        "remote",
                        "vni",
                        "next-protocol",
                        "encap-vrf-id",
                        "decap-vrf-id")

    def __init__(self):
        pass

    @staticmethod
    def _configure_interface(node, interface, data,
                             data_representation=DataRepresentation.JSON):
        """Send interface configuration data and check the response.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param data: Configuration data to be sent in PUT request.
        :param data_representation: How the data is represented.
        :type node: dict
        :type interface: str
        :type data: dict
        :type data_representation: DataRepresentation
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the status code in response on PUT is not
        200 = OK.
        """

        status_code, resp = HcUtil.\
            put_honeycomb_data(node, "config_vpp_interfaces", data,
                               data_representation=data_representation)
        if status_code not in (HTTPCodes.OK, HTTPCodes.ACCEPTED):
            raise HoneycombError(
                "The configuration of interface '{0}' was not successful. "
                "Status code: {1}.".format(interface, status_code))
        return resp

    @staticmethod
    def get_all_interfaces_cfg_data(node):
        """Get configuration data about all interfaces from Honeycomb.

        :param node: Honeycomb node.
        :type node: dict
        :returns: Configuration data about all interfaces from Honeycomb.
        :rtype: list
        :raises HoneycombError: If it is not possible to get configuration data.
        """

        status_code, resp = HcUtil.\
            get_honeycomb_data(node, "config_vpp_interfaces")
        if status_code != HTTPCodes.OK:
            raise HoneycombError(
                "Not possible to get configuration information about the "
                "interfaces. Status code: {0}.".format(status_code))
        try:
            return resp["interfaces"]["interface"]

        except (KeyError, TypeError):
            return []

    @staticmethod
    def get_interface_cfg_data(node, interface):
        """Get configuration data about the given interface from Honeycomb.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Configuration data about the given interface from Honeycomb.
        :rtype: dict
        """

        intfs = InterfaceKeywords.get_all_interfaces_cfg_data(node)
        for intf in intfs:
            if intf["name"] == interface:
                return intf
        return {}

    @staticmethod
    def get_all_interfaces_oper_data(node):
        """Get operational data about all interfaces from Honeycomb.

        :param node: Honeycomb node.
        :type node: dict
        :returns: Operational data about all interfaces from Honeycomb.
        :rtype: list
        :raises HoneycombError: If it is not possible to get operational data.
        """

        status_code, resp = HcUtil.\
            get_honeycomb_data(node, "oper_vpp_interfaces")
        if status_code != HTTPCodes.OK:
            raise HoneycombError(
                "Not possible to get operational information about the "
                "interfaces. Status code: {0}.".format(status_code))
        try:
            return resp["interfaces-state"]["interface"]

        except (KeyError, TypeError):
            return []

    @staticmethod
    def get_disabled_interfaces_oper_data(node):
        """Get operational data about all disabled interfaces from Honeycomb.

        :param node: Honeycomb node.
        :type node: dict
        :returns: Operational data about disabled interfaces.
        :rtype: list
        :raises HoneycombError: If it is not possible to get operational data.
        """

        status_code, resp = HcUtil. \
            get_honeycomb_data(node, "oper_disabled_interfaces")
        if status_code == HTTPCodes.NOT_FOUND:
            raise HoneycombError(
                "No disabled interfaces present on node."
            )
        if status_code != HTTPCodes.OK:
            raise HoneycombError(
                "Not possible to get operational information about the "
                "interfaces. Status code: {0}.".format(status_code))
        try:
            return resp["disabled-interfaces"]["disabled-interface-index"]

        except (KeyError, TypeError):
            return []

    @staticmethod
    def get_interface_oper_data(node, interface):
        """Get operational data about the given interface from Honeycomb.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Operational data about the given interface from Honeycomb.
        :rtype: dict
        """

        intfs = InterfaceKeywords.get_all_interfaces_oper_data(node)
        for intf in intfs:
            if intf["name"] == interface:
                return intf
        return {}

    @staticmethod
    def _set_interface_properties(node, interface, path, new_value=None):
        """Set interface properties.

        This method reads interface configuration data, creates, changes or
        removes the requested data and puts it back to Honeycomb.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param path:  Path to data we want to change / create / remove.
        :param new_value: The new value to be set. If None, the item will be
        removed.
        :type node: dict
        :type interface: str
        :type path: tuple
        :type new_value: str, dict or list
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If it is not possible to get or set the data.
        """

        status_code, resp = HcUtil.\
            get_honeycomb_data(node, "config_vpp_interfaces")
        if status_code != HTTPCodes.OK:
            raise HoneycombError(
                "Not possible to get configuration information about the "
                "interfaces. Status code: {0}.".format(status_code))

        if new_value:
            new_data = HcUtil.set_item_value(resp, path, new_value)
        else:
            new_data = HcUtil.remove_item(resp, path)
        return InterfaceKeywords._configure_interface(node, interface, new_data)

    @staticmethod
    def set_interface_state(node, interface, state="up"):
        """Set VPP interface state.

        The keyword changes the administration state of interface to up or down
        depending on the parameter "state".

        :param node: Honeycomb node.
        :param interface: Interface name, key, link name or sw_if_index.
        :param state: The requested state, only "up" and "down" are valid
        values.
        :type node: dict
        :type interface: str
        :type state: str
        :returns: Content of response.
        :rtype: bytearray
        :raises KeyError: If the argument "state" is nor "up" or "down".
        :raises HoneycombError: If the interface is not present on the node.
        """

        intf_state = {"up": "true",
                      "down": "false"}

        interface = Topology.convert_interface_reference(
            node, interface, "name")

        intf = interface.replace("/", "%2F")
        path = "/interface/{0}".format(intf)

        status_code, resp = HcUtil.\
            get_honeycomb_data(node, "config_vpp_interfaces", path)
        if status_code != HTTPCodes.OK:
            raise HoneycombError(
                "Not possible to get configuration information about the "
                "interfaces. Status code: {0}.".format(status_code))

        resp["interface"][0]["enabled"] = intf_state[state.lower()]

        status_code, resp = HcUtil. \
            put_honeycomb_data(node, "config_vpp_interfaces", resp, path,
                               data_representation=DataRepresentation.JSON)
        if status_code not in (HTTPCodes.OK, HTTPCodes.ACCEPTED):
            raise HoneycombError(
                "The configuration of interface '{0}' was not successful. "
                "Status code: {1}.".format(interface, status_code))
        return resp

    @staticmethod
    def set_interface_up(node, interface):
        """Set the administration state of VPP interface to up.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Content of response
        :rtype: bytearray
        """

        return InterfaceKeywords.set_interface_state(node, interface, "up")

    @staticmethod
    def set_interface_down(node, interface):
        """Set the administration state of VPP interface to down.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Content of response.
        :rtype: bytearray
        """

        return InterfaceKeywords.set_interface_state(node, interface, "down")

    @staticmethod
    def add_bridge_domain_to_interface(node, interface, bd_name,
                                       split_horizon_group=None, bvi=None):
        """Add a new bridge domain to an interface and set its parameters.

        :param node: Honeycomb node.
        :param interface: Interface name, key, link name or sw_if_index.
        :param bd_name: Bridge domain name.
        :param split_horizon_group: Split-horizon group name.
        :param bvi: The bridged virtual interface.
        :type node: dict
        :type interface: str
        :type bd_name: str
        :type split_horizon_group: str
        :type bvi: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the interface is not present on the node.
        """

        interface = Topology.convert_interface_reference(
            node, interface, "name")

        v3po_l2 = {"bridge-domain": str(bd_name)}
        if split_horizon_group:
            v3po_l2["split-horizon-group"] = str(split_horizon_group)
        if bvi:
            v3po_l2["bridged-virtual-interface"] = str(bvi)

        path = ("interfaces", ("interface", "name", str(interface)), "v3po:l2")

        return InterfaceKeywords._set_interface_properties(
            node, interface, path, v3po_l2)

    @staticmethod
    def remove_bridge_domain_from_interface(node, interface):
        """Remove bridge domain assignment from interface.

        :param node: Honeycomb node.
        :param interface: Interface name, key, link name or sw_if_index.
        :type node: dict
        :type interface: str or int

        :raises HoneycombError: If the operation fails.
        """

        interface = Topology.convert_interface_reference(
            node, interface, "name")

        intf = interface.replace("/", "%2F")

        path = "/interface/{0}/v3po:l2".format(intf)

        status_code, response = HcUtil.delete_honeycomb_data(
            node, "config_vpp_interfaces", path)

        if status_code != HTTPCodes.OK:
            if '"error-tag":"data-missing"' in response:
                logger.debug("Data does not exist in path.")
            else:
                raise HoneycombError(
                    "Could not remove bridge domain assignment from interface "
                    "'{0}'. Status code: {1}.".format(interface, status_code))

    @staticmethod
    def get_bd_oper_data_from_interface(node, interface):
        """Returns operational data about bridge domain settings in the
        interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Operational data about bridge domain settings in the
        interface.
        :rtype: dict
        """

        if_data = InterfaceKeywords.get_interface_oper_data(node, interface)

        if if_data:
            try:
                return if_data["v3po:l2"]
            except KeyError:
                return {}
        return {}

    @staticmethod
    def configure_interface_base(node, interface, param, value):
        """Configure the base parameters of interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param param: Parameter to configure (set, change, remove)
        :param value: The value of parameter. If None, the parameter will be
        removed.
        :type node: dict
        :type interface: str
        :type param: str
        :type value: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        if param not in InterfaceKeywords.INTF_PARAMS:
            raise HoneycombError("The parameter {0} is invalid.".format(param))

        path = ("interfaces", ("interface", "name", interface), param)
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, value)

    @staticmethod
    def configure_interface_ipv4(node, interface, param, value):
        """Configure IPv4 parameters of interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param param: Parameter to configure (set, change, remove)
        :param value: The value of parameter. If None, the parameter will be
        removed.
        :type node: dict
        :type interface: str
        :type param: str
        :type value: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        interface = Topology.convert_interface_reference(
            node, interface, "name")

        if param not in InterfaceKeywords.IPV4_PARAMS:
            raise HoneycombError("The parameter {0} is invalid.".format(param))

        path = ("interfaces", ("interface", "name", interface),
                "ietf-ip:ipv4", param)
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, value)

    @staticmethod
    def add_first_ipv4_address(node, interface, ip_addr, network):
        """Add the first IPv4 address.

        If there are any other addresses configured, they will be removed.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param ip_addr: IPv4 address to be set.
        :param network: Netmask or length of network prefix.
        :type node: dict
        :type interface: str
        :type ip_addr: str
        :type network: str or int
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the provided netmask or prefix is not valid.
        """

        interface = Topology.convert_interface_reference(
            node, interface, "name")

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv4")
        if isinstance(network, basestring):
            address = {"address": [{"ip": ip_addr, "netmask": network}, ]}
        elif isinstance(network, int) and (0 < network < 33):
            address = {"address": [{"ip": ip_addr, "prefix-length": network}, ]}
        else:
            raise HoneycombError("Value {0} is not a valid netmask or network "
                                 "prefix length.".format(network))
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, address)

    @staticmethod
    def add_ipv4_address(node, interface, ip_addr, network):
        """Add IPv4 address.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param ip_addr: IPv4 address to be set.
        :param network: Netmask or length of network prefix.
        :type node: dict
        :type interface: str
        :type ip_addr: str
        :type network: str or int
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the provided netmask or prefix is not valid.
        """

        interface = Topology.convert_interface_reference(
            node, interface, "name")

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv4",
                "address")
        if isinstance(network, basestring):
            address = {"address": [{"ip": ip_addr, "netmask": network}, ]}
        elif isinstance(network, int) and (0 < network < 33):
            address = {"address": [{"ip": ip_addr, "prefix-length": network}, ]}
        else:
            raise HoneycombError("Value {0} is not a valid netmask or network "
                                 "prefix length.".format(network))
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, address)

    @staticmethod
    def remove_all_ipv4_addresses(node, interface):
        """Remove all IPv4 addresses from interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv4",
                "address")
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, None)

    @staticmethod
    def add_ipv4_neighbor(node, interface, ip_addr, link_layer_address):
        """Add the IPv4 neighbour.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param ip_addr: IPv4 address of neighbour to be set.
        :param link_layer_address: Link layer address.
        :type node: dict
        :type interface: str
        :type ip_addr: str
        :type link_layer_address: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv4",
                "neighbor")
        neighbor = [{"ip": ip_addr, "link-layer-address": link_layer_address}, ]
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, neighbor)

    @staticmethod
    def remove_all_ipv4_neighbors(node, interface):
        """Remove all IPv4 neighbours.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv4",
                "neighbor")
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, None)

    @staticmethod
    def configure_interface_ipv6(node, interface, param, value):
        """Configure IPv6 parameters of interface

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param param: Parameter to configure (set, change, remove)
        :param value: The value of parameter. If None, the parameter will be
        removed.
        :type node: dict
        :type interface: str
        :type param: str
        :type value: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        if param in InterfaceKeywords.IPV6_PARAMS:
            path = ("interfaces", ("interface", "name", interface),
                    "ietf-ip:ipv6", param)
        elif param in InterfaceKeywords.IPV6_AUTOCONF_PARAMS:
            path = ("interfaces", ("interface", "name", interface),
                    "ietf-ip:ipv6", "autoconf", param)
        else:
            raise HoneycombError("The parameter {0} is invalid.".format(param))

        return InterfaceKeywords._set_interface_properties(
            node, interface, path, value)

    @staticmethod
    def add_first_ipv6_address(node, interface, ip_addr, prefix_len):
        """Add the first IPv6 address.

        If there are any other addresses configured, they will be removed.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param ip_addr: IPv6 address to be set.
        :param prefix_len: Prefix length.
        :type node: dict
        :type interface: str
        :type ip_addr: str
        :type prefix_len: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv6")
        address = {"address": [{"ip": ip_addr, "prefix-length": prefix_len}, ]}
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, address)

    @staticmethod
    def add_ipv6_address(node, interface, ip_addr, prefix_len):
        """Add IPv6 address.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param ip_addr: IPv6 address to be set.
        :param prefix_len: Prefix length.
        :type node: dict
        :type interface: str
        :type ip_addr: str
        :type prefix_len: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv6",
                "address")
        address = [{"ip": ip_addr, "prefix-length": prefix_len}, ]
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, address)

    @staticmethod
    def remove_all_ipv6_addresses(node, interface):
        """Remove all IPv6 addresses from interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv6",
                "address")
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, None)

    @staticmethod
    def add_ipv6_neighbor(node, interface, ip_addr, link_layer_address):
        """Add the IPv6 neighbour.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param ip_addr: IPv6 address of neighbour to be set.
        :param link_layer_address: Link layer address.
        :type node: dict
        :type interface: str
        :type ip_addr: str
        :type link_layer_address: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv6",
                "neighbor")
        neighbor = [{"ip": ip_addr, "link-layer-address": link_layer_address}, ]
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, neighbor)

    @staticmethod
    def remove_all_ipv6_neighbors(node, interface):
        """Remove all IPv6 neighbours.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces", ("interface", "name", interface), "ietf-ip:ipv6",
                "neighbor")
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, None)

    @staticmethod
    def configure_interface_ethernet(node, interface, param, value):
        """Configure the ethernet parameters of interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param param: Parameter to configure (set, change, remove)
        :param value: The value of parameter. If None, the parameter will be
        removed.
        :type node: dict
        :type interface: str
        :type param: str
        :type value: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        if param not in InterfaceKeywords.ETH_PARAMS:
            raise HoneycombError("The parameter {0} is invalid.".format(param))
        path = ("interfaces", ("interface", "name", interface), "v3po:ethernet",
                param)
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, value)

    @staticmethod
    def configure_interface_routing(node, interface, param, value):
        """Configure the routing parameters of interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param param: Parameter to configure (set, change, remove)
        :param value: The value of parameter. If None, the parameter will be
        removed.
        :type node: dict
        :type interface: str
        :type param: str
        :type value: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        if param not in InterfaceKeywords.ROUTING_PARAMS:
            raise HoneycombError("The parameter {0} is invalid.".format(param))

        path = ("interfaces", ("interface", "name", interface), "v3po:routing",
                param)
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, value)

    @staticmethod
    def create_vxlan_interface(node, interface, **kwargs):
        """Create a new VxLAN interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param kwargs: Parameters and their values. The accepted parameters are
        defined in InterfaceKeywords.VXLAN_PARAMS.
        :type node: dict
        :type interface: str
        :type kwargs: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        new_vx_lan = {
            "name": interface,
            "type": "v3po:vxlan-tunnel",
            "v3po:vxlan": {}
        }
        for param, value in kwargs.items():
            if param not in InterfaceKeywords.VXLAN_PARAMS:
                raise HoneycombError("The parameter {0} is invalid.".
                                     format(param))
            new_vx_lan["v3po:vxlan"][param] = value

        path = ("interfaces", "interface")
        vx_lan_structure = [new_vx_lan, ]
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, vx_lan_structure)

    @staticmethod
    def delete_interface(node, interface):
        """Delete an interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :type node: dict
        :type interface: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If it is not possible to get information about
        interfaces or it is not possible to delete the interface.
        """

        path = ("interfaces", ("interface", "name", interface))

        status_code, resp = HcUtil.\
            get_honeycomb_data(node, "config_vpp_interfaces")
        if status_code != HTTPCodes.OK:
            raise HoneycombError(
                "Not possible to get configuration information about the "
                "interfaces. Status code: {0}.".format(status_code))

        new_data = HcUtil.remove_item(resp, path)
        status_code, resp = HcUtil.\
            put_honeycomb_data(node, "config_vpp_interfaces", new_data)
        if status_code != HTTPCodes.OK:
            raise HoneycombError("Not possible to remove interface {0}. "
                                 "Status code: {1}.".
                                 format(interface, status_code))
        return resp

    @staticmethod
    def configure_interface_vxlan(node, interface, **kwargs):
        """Configure VxLAN on the interface.

        The keyword configures VxLAN parameters on the given interface. The type
        of interface must be set to "v3po:vxlan-tunnel".
        The new VxLAN parameters overwrite the current configuration. If a
        parameter in new configuration is missing, it is removed from VxLAN
        configuration.
        If the dictionary kwargs is empty, VxLAN configuration is removed.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param kwargs: Parameters and their values. The accepted parameters are
        defined in InterfaceKeywords.VXLAN_PARAMS.
        :type node: dict
        :type interface: str
        :type kwargs: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        vx_lan_structure = dict()
        for param, value in kwargs.items():
            if param not in InterfaceKeywords.VXLAN_PARAMS:
                raise HoneycombError("The parameter {0} is invalid.".
                                     format(param))
            vx_lan_structure[param] = value

        path = ("interfaces", ("interface", "name", interface), "v3po:vxlan")
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, vx_lan_structure)

    @staticmethod
    def configure_interface_l2(node, interface, param, value):
        """Configure the L2 parameters of interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param param: Parameter to configure (set, change, remove)
        :param value: The value of parameter. If None, the parameter will be
        removed.
        :type node: dict
        :type interface: str
        :type param: str
        :type value: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        if param not in InterfaceKeywords.L2_PARAMS:
            raise HoneycombError("The parameter {0} is invalid.".format(param))
        path = ("interfaces", ("interface", "name", interface), "v3po:l2",
                param)
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, value)

    @staticmethod
    def create_tap_interface(node, interface, **kwargs):
        """Create a new TAP interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param kwargs: Parameters and their values. The accepted parameters are
        defined in InterfaceKeywords.TAP_PARAMS.
        :type node: dict
        :type interface: str
        :type kwargs: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        new_tap = {
            "name": interface,
            "type": "v3po:tap",
            "v3po:tap": {}
        }
        for param, value in kwargs.items():
            if param not in InterfaceKeywords.TAP_PARAMS:
                raise HoneycombError("The parameter {0} is invalid.".
                                     format(param))
            new_tap["v3po:tap"][param] = value

        path = ("interfaces", "interface")
        new_tap_structure = [new_tap, ]
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, new_tap_structure)

    @staticmethod
    def configure_interface_tap(node, interface, **kwargs):
        """Configure TAP on the interface.

        The keyword configures TAP parameters on the given interface. The type
        of interface must be set to "v3po:tap".
        The new TAP parameters overwrite the current configuration. If a
        parameter in new configuration is missing, it is removed from TAP
        configuration.
        If the dictionary kwargs is empty, TAP configuration is removed.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param kwargs: Parameters and their values. The accepted parameters are
        defined in InterfaceKeywords.TAP_PARAMS.
        :type node: dict
        :type interface: str
        :type kwargs: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        tap_structure = dict()
        for param, value in kwargs.items():
            if param not in InterfaceKeywords.TAP_PARAMS:
                raise HoneycombError("The parameter {0} is invalid.".
                                     format(param))
            tap_structure[param] = value

        path = ("interfaces", ("interface", "name", interface), "v3po:tap")
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, tap_structure)

    @staticmethod
    def configure_interface_vhost_user(node, interface, **kwargs):
        """Configure vhost-user on the interface.

        The keyword configures vhost-user parameters on the given interface.
        The type of interface must be set to "v3po:vhost-user".
        The new vhost-user parameters overwrite the current configuration. If a
        parameter in new configuration is missing, it is removed from vhost-user
        configuration.
        If the dictionary kwargs is empty, vhost-user configuration is removed.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param kwargs: Parameters and their values. The accepted parameters are
        defined in InterfaceKeywords.VHOST_USER_PARAMS.
        :type node: dict
        :type interface: str
        :type kwargs: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        vhost_structure = dict()
        for param, value in kwargs.items():
            if param not in InterfaceKeywords.VHOST_USER_PARAMS:
                raise HoneycombError("The parameter {0} is invalid.".
                                     format(param))
            vhost_structure[param] = value

        path = ("interfaces", ("interface", "name", interface),
                "v3po:vhost-user")
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, vhost_structure)

    @staticmethod
    def create_vhost_user_interface(node, interface, **kwargs):
        """Create a new vhost-user interface.

        :param node: Honeycomb node.
        :param interface: The name of interface.
        :param kwargs: Parameters and their values. The accepted parameters are
        defined in InterfaceKeywords.VHOST_USER_PARAMS.
        :type node: dict
        :type interface: str
        :type kwargs: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        """

        new_vhost = {
            "name": interface,
            "type": "v3po:vhost-user",
            "v3po:vhost-user": {}
        }
        for param, value in kwargs.items():
            if param not in InterfaceKeywords.VHOST_USER_PARAMS:
                raise HoneycombError("The parameter {0} is invalid.".
                                     format(param))
            new_vhost["v3po:vhost-user"][param] = value

        path = ("interfaces", "interface")
        new_vhost_structure = [new_vhost, ]
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, new_vhost_structure)

    @staticmethod
    def create_sub_interface(node, super_interface, match, tags=None, **kwargs):
        """Create a new sub-interface.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param match: Match type. The valid values are defined in
        InterfaceKeywords.SUB_IF_MATCH.
        :param tags: List of tags.
        :param kwargs: Parameters and their values. The accepted parameters are
        defined in InterfaceKeywords.SUB_IF_PARAMS.
        :type node: dict
        :type super_interface: str
        :type match: str
        :type tags: list
        :type kwargs: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the parameter is not valid.
        :raises KeyError: If the parameter 'match' is invalid.
        """

        match_type = {
            "default":
                {"default": {}},
            "untagged":
                {"untagged": {}},
            "vlan-tagged":
                {"vlan-tagged": {"match-exact-tags": "false"}},
            "vlan-tagged-exact-match":
                {"vlan-tagged": {"match-exact-tags": "true"}}
        }

        new_sub_interface = {
            "tags": {
                "tag": []
            },
        }

        for param, value in kwargs.items():
            if param in InterfaceKeywords.SUB_IF_PARAMS:
                new_sub_interface[param] = value
            else:
                raise HoneycombError("The parameter {0} is invalid.".
                                     format(param))
        try:
            new_sub_interface["match"] = match_type[match]
        except KeyError:
            raise HoneycombError("The value '{0}' of parameter 'match' is "
                                 "invalid.".format(match))

        if tags:
            new_sub_interface["tags"]["tag"].extend(tags)

        path = ("interfaces",
                ("interface", "name", super_interface),
                "vpp-vlan:sub-interfaces",
                "sub-interface")
        new_sub_interface_structure = [new_sub_interface, ]
        return InterfaceKeywords._set_interface_properties(
            node, super_interface, path, new_sub_interface_structure)

    @staticmethod
    def get_sub_interface_oper_data(node, super_interface, identifier):
        """Retrieves sub-interface operational data using Honeycomb API.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param identifier: The ID of sub-interface.
        :type node: dict
        :type super_interface: str
        :type identifier: int
        :returns: Sub-interface operational data.
        :rtype: dict
        :raises HoneycombError: If there is no sub-interface with the given ID.
        """

        if_data = InterfaceKeywords.get_interface_oper_data(node,
                                                            super_interface)
        for sub_if in if_data["vpp-vlan:sub-interfaces"]["sub-interface"]:
            if str(sub_if["identifier"]) == str(identifier):
                return sub_if

        raise HoneycombError("The interface {0} does not have sub-interface "
                             "with ID {1}".format(super_interface, identifier))

    @staticmethod
    def remove_all_sub_interfaces(node, super_interface):
        """Remove all sub-interfaces from the given interface.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :type node: dict
        :type super_interface: str
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces",
                ("interface", "name", super_interface),
                "vpp-vlan:sub-interfaces")

        return InterfaceKeywords._set_interface_properties(
            node, super_interface, path, {})

    @staticmethod
    def set_sub_interface_state(node, super_interface, identifier, state):
        """Set the administrative state of sub-interface.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param identifier: The ID of sub-interface.
        :param state: Required sub-interface state - up or down.
        :type node: dict
        :type super_interface: str
        :type identifier: int
        :type state: str
        :returns: Content of response.
        :rtype: bytearray
        """

        intf_state = {"up": "true",
                      "down": "false"}

        path = ("interfaces",
                ("interface", "name", super_interface),
                "vpp-vlan:sub-interfaces",
                ("sub-interface", "identifier", int(identifier)),
                "enabled")

        return InterfaceKeywords._set_interface_properties(
            node, super_interface, path, intf_state[state])

    @staticmethod
    def add_bridge_domain_to_sub_interface(node, super_interface, identifier,
                                           config):
        """Add a sub-interface to a bridge domain and set its parameters.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param identifier: The ID of sub-interface.
        :param config: Bridge domain configuration.
        :type node: dict
        :type super_interface: str
        :type identifier: int
        :type config: dict
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces",
                ("interface", "name", super_interface),
                "vpp-vlan:sub-interfaces",
                ("sub-interface", "identifier", int(identifier)),
                "l2")

        return InterfaceKeywords._set_interface_properties(
            node, super_interface, path, config)

    @staticmethod
    def get_bd_data_from_sub_interface(node, super_interface, identifier):
        """Get the operational data about the bridge domain from sub-interface.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param identifier: The ID of sub-interface.
        :type node: dict
        :type super_interface: str
        :type identifier: int
        :returns: Operational data about the bridge domain.
        :rtype: dict
        :raises HoneycombError: If there is no sub-interface with the given ID.
        """

        try:
            bd_data = InterfaceKeywords.get_sub_interface_oper_data(
                node, super_interface, identifier)["l2"]
            return bd_data
        except KeyError:
            raise HoneycombError("The operational data does not contain "
                                 "information about a bridge domain.")

    @staticmethod
    def configure_tag_rewrite(node, super_interface, identifier, config):
        """Add / change / disable vlan tag rewrite on a sub-interface.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param identifier: The ID of sub-interface.
        :param config: Rewrite tag configuration.
        :type node: dict
        :type super_interface: str
        :type identifier: int
        :type config: dict
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces",
                ("interface", "name", super_interface),
                "vpp-vlan:sub-interfaces",
                ("sub-interface", "identifier", int(identifier)),
                "l2",
                "rewrite")

        return InterfaceKeywords._set_interface_properties(
            node, super_interface, path, config)

    @staticmethod
    def get_tag_rewrite_oper_data(node, super_interface, identifier):
        """Get the operational data about tag rewrite.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param identifier: The ID of sub-interface.
        :type node: dict
        :type super_interface: str
        :type identifier: int
        :returns: Operational data about tag rewrite.
        :rtype: dict
        :raises HoneycombError: If there is no sub-interface with the given ID.
        """

        try:
            tag_rewrite = InterfaceKeywords.get_sub_interface_oper_data(
                node, super_interface, identifier)["l2"]["rewrite"]
            return tag_rewrite
        except KeyError:
            raise HoneycombError("The operational data does not contain "
                                 "information about the tag-rewrite.")

    @staticmethod
    def add_ipv4_address_to_sub_interface(node, super_interface, identifier,
                                          ip_addr, network):
        """Add an ipv4 address to the specified sub-interface, with the provided
        netmask or network prefix length. Any existing ipv4 addresses on the
        sub-interface will be replaced.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param identifier: The ID of sub-interface.
        :param ip_addr: IPv4 address to be set.
        :param network: Network mask or network prefix length.
        :type node: dict
        :type super_interface: str
        :type identifier: int
        :type ip_addr: str
        :type network: str or int
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the provided netmask or prefix is not valid.
        """

        path = ("interfaces",
                ("interface", "name", super_interface),
                "vpp-vlan:sub-interfaces",
                ("sub-interface", "identifier", int(identifier)),
                "ipv4")

        if isinstance(network, basestring):
            address = {"address": [{"ip": ip_addr, "netmask": network}, ]}

        elif isinstance(network, int) and 0 < network < 33:
            address = {"address": [{"ip": ip_addr, "prefix-length": network}, ]}

        else:
            raise HoneycombError("{0} is not a valid netmask or prefix length."
                                 .format(network))

        return InterfaceKeywords._set_interface_properties(
            node, super_interface, path, address)

    @staticmethod
    def remove_all_ipv4_addresses_from_sub_interface(node, super_interface,
                                                     identifier):
        """Remove all ipv4 addresses from the specified sub-interface.

        :param node: Honeycomb node.
        :param super_interface: Super interface.
        :param identifier: The ID of sub-interface.
        :type node: dict
        :type super_interface: str
        :type identifier: int
        :returns: Content of response.
        :rtype: bytearray
        """

        path = ("interfaces",
                ("interface", "name", super_interface),
                "vpp-vlan:sub-interfaces",
                ("sub-interface", "identifier", int(identifier)),
                "ipv4", "address")

        return InterfaceKeywords._set_interface_properties(
            node, super_interface, path, None)

    @staticmethod
    def compare_data_structures(data, ref, _path=''):
        """Checks if data obtained from UUT is as expected. If it is not,
        proceeds down the list/dictionary tree and finds the point of mismatch.

        :param data: Data to be checked.
        :param ref: Referential data used for comparison.
        :param _path: Used in recursive calls, stores the path taken down
        the JSON tree.
        :type data: dict
        :type ref: dict
        :type _path: str

        :raises HoneycombError: If the data structures do not match in some way,
        or if they are not in deserialized JSON format.
        """

        if data == ref:
            return True

        elif isinstance(data, dict) and isinstance(ref, dict):
            for key in ref:
                if key not in data:
                    raise HoneycombError(
                        "Key {key} is not present in path {path}. Keys in path:"
                        "{data_keys}".format(
                            key=key,
                            path=_path,
                            data_keys=data.keys()))

                if data[key] != ref[key]:
                    if isinstance(data[key], list) \
                            or isinstance(data[key], dict):
                        InterfaceKeywords.compare_data_structures(
                            data[key], ref[key],
                            _path + '[{0}]'.format(key))
                    else:
                        raise HoneycombError(
                            "Data mismatch, key {key} in path {path} has value"
                            " {data}, but should be {ref}".format(
                                key=key,
                                path=_path,
                                data=data[key],
                                ref=ref[key]))

        elif isinstance(data, list) and isinstance(ref, list):
            for item in ref:
                if item not in data:
                    if isinstance(item, dict):
                        InterfaceKeywords.compare_data_structures(
                            data[0], item,
                            _path + '[{0}]'.format(ref.index(item)))
                    else:
                        raise HoneycombError(
                            "Data mismatch, list item {index} in path {path}"
                            " has value {data}, but should be {ref}".format(
                                index=ref.index(item),
                                path=_path,
                                data=data[0],
                                ref=item))

        else:
            raise HoneycombError(
                "Unexpected data type {data_type} in path {path}, reference"
                " type is {ref_type}. Must be list or dictionary.".format(
                    data_type=type(data),
                    ref_type=type(ref),
                    path=_path))

    @staticmethod
    def compare_interface_lists(list1, list2):
        """Compare provided lists of interfaces by name.

        :param list1: List of interfaces.
        :param list2: List of interfaces.
        :type list1: list
        :type list2: list
        :raises HoneycombError: If an interface exists in only one of the lists.
        """

        ignore = ["vx_tunnel0", "vxlan_gpe_tunnel0"]
        # these have no equivalent in config data and no effect on VPP

        names1 = [x['name'] for x in list1]
        names2 = [x['name'] for x in list2]

        for name in names1:
            if name not in names2 and name not in ignore:
                raise HoneycombError("Interface {0} not present in list {1}"
                                     .format(name, list2))
        for name in names2:
            if name not in names1 and name not in ignore:
                raise HoneycombError("Interface {0} not present in list {1}"
                                     .format(name, list1))

    @staticmethod
    def create_vxlan_gpe_interface(node, interface, **kwargs):
        """Create a new VxLAN GPE interface.

        :param node: Honeycomb node.
        :param interface: The name of interface to be created.
        :param kwargs: Parameters and their values. The accepted parameters are
        defined in InterfaceKeywords.VXLAN_GPE_PARAMS.
        :type node: dict
        :type interface: str
        :type kwargs: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If a parameter in kwargs is not valid.
        """

        new_vxlan_gpe = {
            "name": interface,
            "type": "v3po:vxlan-gpe-tunnel",
            "v3po:vxlan-gpe": {}
        }
        for param, value in kwargs.items():
            if param in InterfaceKeywords.INTF_PARAMS:
                new_vxlan_gpe[param] = value
            elif param in InterfaceKeywords.VXLAN_GPE_PARAMS:
                new_vxlan_gpe["v3po:vxlan-gpe"][param] = value
            else:
                raise HoneycombError("The parameter {0} is invalid.".
                                     format(param))
        path = ("interfaces", "interface")
        vxlan_gpe_structure = [new_vxlan_gpe, ]
        return InterfaceKeywords._set_interface_properties(
            node, interface, path, vxlan_gpe_structure)

    @staticmethod
    def enable_acl_on_interface(node, interface, table_name):
        """Enable ACL on the given interface.

        :param node: Honeycomb node.
        :param interface: The interface where the ACL will be enabled.
        :param table_name: Name of the classify table.
        :type node: dict
        :type interface: str
        :type table_name: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the configuration of interface is not
        successful.
        """

        interface = interface.replace("/", "%2F")

        data = {
            "v3po:acl": {
                "ingress": {
                    "ip4-acl": {
                        "classify-table": table_name
                    },
                    "l2-acl": {
                        "classify-table": table_name
                    }
                }
            }
        }

        path = "/interface/" + interface + "/v3po:acl"
        status_code, resp = HcUtil.\
            put_honeycomb_data(node, "config_vpp_interfaces", data, path,
                               data_representation=DataRepresentation.JSON)
        if status_code not in (HTTPCodes.OK, HTTPCodes.ACCEPTED):
            raise HoneycombError(
                "The configuration of interface '{0}' was not successful. "
                "Status code: {1}.".format(interface, status_code))
        return resp

    @staticmethod
    def disable_acl_on_interface(node, interface):
        """Disable ACL on the given interface.

        :param node: Honeycomb node.
        :param interface: The interface where the ACL will be disabled.
        :type node: dict
        :type interface: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the configuration of interface is not
        successful.
        """

        interface = interface.replace("/", "%2F")

        path = "/interface/" + interface + "/v3po:acl"

        status_code, resp = HcUtil.\
            delete_honeycomb_data(node, "config_vpp_interfaces", path)

        if status_code != HTTPCodes.OK:
            raise HoneycombError(
                "The configuration of interface '{0}' was not successful. "
                "Status code: {1}.".format(interface, status_code))
        return resp

    @staticmethod
    def create_pbb_sub_interface(node, intf, params):
        """Creates a PBB sub-interface on the given interface and sets its
        parameters.

        :param node: Honeycomb node.
        :param intf: The interface where PBB sub-interface will be configured.
        :param params: Configuration parameters of the sub-interface to be
        created.
        :type node: dict
        :type intf: str
        :type params: dict
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the configuration of sub-interface is not
        successful.
        """

        interface = intf.replace("/", "%2F")
        path = "/interface/{0}/pbb-rewrite/".format(interface)
        status_code, resp = HcUtil. \
            put_honeycomb_data(node, "config_vpp_interfaces", params, path,
                               data_representation=DataRepresentation.JSON)
        if status_code not in (HTTPCodes.OK, HTTPCodes.ACCEPTED):
            raise HoneycombError(
                "The configuration of PBB sub-interface '{0}' was not "
                "successful. Status code: {1}.".format(intf, status_code))
        return resp

    @staticmethod
    def delete_pbb_sub_interface(node, intf):
        """Deletes the given PBB sub-interface.

        :param node: Honeycomb node.
        :param intf: The interface where PBB sub-interface will be deleted.
        :type node: dict
        :type intf: str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If the removal of sub-interface is not
        successful.
        """

        interface = intf.replace("/", "%2F")
        path = "/interface/{0}/pbb-rewrite".format(interface)

        status_code, resp = HcUtil. \
            delete_honeycomb_data(node, "config_vpp_interfaces", path)
        if status_code != HTTPCodes.OK:
            raise HoneycombError(
                "The removal of pbb sub-interface '{0}' was not successful. "
                "Status code: {1}.".format(intf, status_code))
        return resp

    @staticmethod
    def get_pbb_sub_interface_oper_data(node, intf, sub_if_id):
        """Retrieves PBB sub-interface operational data from Honeycomb.

        :param node: Honeycomb node.
        :param intf: The interface where PBB sub-interface is located.
        :param sub_if_id: ID of the PBB sub-interface.
        :type node: dict
        :type intf: str
        :type sub_if_id: str or int
        :returns: PBB sub-interface operational data.
        :rtype: dict
        :raises HoneycombError: If the removal of sub-interface is not
        successful.
        """

        raise NotImplementedError

    @staticmethod
    def check_disabled_interface(node, interface):
        """Retrieves list of disabled interface indices from Honeycomb,
        and matches with the provided interface by index.

        :param node: Honeycomb node.
        :param interface: Index number of an interface on the node.
        :type node: dict
        :type interface: int
        :returns: True if the interface exists in disabled interfaces.
        :rtype: bool
        :raises HoneycombError: If the interface is not present
         in retrieved list of disabled interfaces.
         """
        data = InterfaceKeywords.get_disabled_interfaces_oper_data(node)
        # decrement by one = conversion from HC if-index to VPP sw_if_index
        interface -= 1

        for item in data:
            if item["index"] == interface:
                return True
        raise HoneycombError("Interface index {0} not present in list"
                             " of disabled interfaces.".format(interface))

    @staticmethod
    def configure_interface_span(node, dst_interface, *src_interfaces):
        """Configure SPAN port mirroring on the specified interfaces. If no
         source interface is provided, SPAN will be disabled.

        :param node: Honeycomb node.
        :param dst_interface: Interface to mirror packets to.
        :param src_interfaces: List of interfaces to mirror packets from.
        :type node: dict
        :type dst_interface: str
        :type src_interfaces: list of str
        :returns: Content of response.
        :rtype: bytearray
        :raises HoneycombError: If SPAN could not be configured.
        """

        interface = dst_interface.replace("/", "%2F")
        path = "/interface/" + interface + "/span"

        if not src_interfaces:
            status_code, _ = HcUtil.delete_honeycomb_data(
                node, "config_vpp_interfaces", path)

        data = {
            "span": {
                "mirrored-interfaces": {
                    "mirrored-interface": src_interfaces
                }
            }
        }

        status_code, _ = HcUtil.put_honeycomb_data(
            node, "config_vpp_interfaces", data, path)

        if status_code not in (HTTPCodes.OK, HTTPCodes.ACCEPTED):
            raise HoneycombError(
                "Configuring SPAN failed. Status code:{0}".format(status_code))

    @staticmethod
    def add_interface_local0_to_topology(node):
        """Use Topology methods to add interface "local0" to working topology,
        if not already present.

        :param node: DUT node.
        :type node: dict
        """

        if Topology.get_interface_by_sw_index(node, 0) is None:
            local0_key = Topology.add_new_port(node, "localzero")
            Topology.update_interface_sw_if_index(node, local0_key, 0)
            Topology.update_interface_name(node, local0_key, "local0")