# Copyright (c) 2016-2019 Intel Corporation
#
# 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.

import ipaddress
import logging
import six
import os
import time

from six import moves

from multiprocessing import Queue, Process, JoinableQueue

from yardstick.common import utils
from yardstick.common import exceptions
from yardstick.network_services.libs.ixia_libs.ixnet import ixnet_api
from yardstick.network_services.vnf_generic.vnf.sample_vnf import SampleVNFTrafficGen
from yardstick.network_services.vnf_generic.vnf.sample_vnf import ClientResourceHelper
from yardstick.network_services.vnf_generic.vnf.sample_vnf import Rfc2544ResourceHelper


LOG = logging.getLogger(__name__)

WAIT_AFTER_CFG_LOAD = 10
WAIT_FOR_TRAFFIC = 30
WAIT_PROTOCOLS_STARTED = 360


class IxiaBasicScenario(object):
    """Ixia Basic scenario for flow from port to port"""

    def __init__(self, client, context_cfg, ixia_cfg):

        self.client = client
        self.context_cfg = context_cfg
        self.ixia_cfg = ixia_cfg

        self._uplink_vports = None
        self._downlink_vports = None

    def apply_config(self):
        pass

    def run_protocols(self):
        pass

    def stop_protocols(self):
        pass

    def create_traffic_model(self, traffic_profile=None):
        # pylint: disable=unused-argument
        vports = self.client.get_vports()
        self._uplink_vports = vports[::2]
        self._downlink_vports = vports[1::2]
        self.client.create_traffic_model(self._uplink_vports,
                                         self._downlink_vports)


class IxiaL3Scenario(IxiaBasicScenario):
    """Ixia scenario for L3 flow between static ip's"""

    def _add_static_ips(self):
        vports = self.client.get_vports()
        uplink_intf_vport = [(self.client.get_static_interface(vport), vport)
                             for vport in vports[::2]]
        downlink_intf_vport = [(self.client.get_static_interface(vport), vport)
                               for vport in vports[1::2]]

        for index in range(len(uplink_intf_vport)):
            intf, vport = uplink_intf_vport[index]
            try:
                iprange = self.ixia_cfg['flow'].get('src_ip')[index]
                start_ip = utils.get_ip_range_start(iprange)
                count = utils.get_ip_range_count(iprange)
                self.client.add_static_ipv4(intf, vport, start_ip, count, '32')
            except IndexError:
                raise exceptions.IncorrectFlowOption(
                    option="src_ip", link="uplink_{}".format(index))

            intf, vport = downlink_intf_vport[index]
            try:
                iprange = self.ixia_cfg['flow'].get('dst_ip')[index]
                start_ip = utils.get_ip_range_start(iprange)
                count = utils.get_ip_range_count(iprange)
                self.client.add_static_ipv4(intf, vport, start_ip, count, '32')
            except IndexError:
                raise exceptions.IncorrectFlowOption(
                    option="dst_ip", link="downlink_{}".format(index))

    def _add_interfaces(self):
        vports = self.client.get_vports()
        uplink_vports = (vport for vport in vports[::2])
        downlink_vports = (vport for vport in vports[1::2])

        ix_node = next(node for _, node in self.context_cfg['nodes'].items()
                       if node['role'] == 'IxNet')

        for intf in ix_node['interfaces'].values():
            ip = intf.get('local_ip')
            mac = intf.get('local_mac')
            gateway = None
            try:
                gateway = next(route.get('gateway')
                               for route in ix_node.get('routing_table')
                               if route.get('if') == intf.get('ifname'))
            except StopIteration:
                LOG.debug("Gateway not provided")

            if 'uplink' in intf.get('vld_id'):
                self.client.add_interface(next(uplink_vports),
                                          ip, mac, gateway)
            else:
                self.client.add_interface(next(downlink_vports),
                                          ip, mac, gateway)

    def apply_config(self):
        self._add_interfaces()
        self._add_static_ips()

    def create_traffic_model(self, traffic_profile=None):
        # pylint: disable=unused-argument
        vports = self.client.get_vports()
        self._uplink_vports = vports[::2]
        self._downlink_vports = vports[1::2]

        uplink_endpoints = [port + '/protocols/static'
                            for port in self._uplink_vports]
        downlink_endpoints = [port + '/protocols/static'
                              for port in self._downlink_vports]

        self.client.create_ipv4_traffic_model(uplink_endpoints,
                                              downlink_endpoints)


class IxiaPppoeClientScenario(object):
    def __init__(self, client, context_cfg, ixia_cfg):

        self.client = client

        self._uplink_vports = None
        self._downlink_vports = None

        self._access_topologies = []
        self._core_topologies = []

        self._context_cfg = context_cfg
        self._ixia_cfg = ixia_cfg
        self.protocols = []
        self.device_groups = []

    def apply_config(self):
        vports = self.client.get_vports()
        self._uplink_vports = vports[::2]
        self._downlink_vports = vports[1::2]
        self._fill_ixia_config()
        self._apply_access_network_config()
        self._apply_core_network_config()

    def create_traffic_model(self, traffic_profile):
        endpoints_id_pairs = self._get_endpoints_src_dst_id_pairs(
            traffic_profile.full_profile)
        endpoints_obj_pairs = \
            self._get_endpoints_src_dst_obj_pairs(endpoints_id_pairs)
        uplink_endpoints = endpoints_obj_pairs[::2]
        downlink_endpoints = endpoints_obj_pairs[1::2]
        self.client.create_ipv4_traffic_model(uplink_endpoints,
                                              downlink_endpoints)

    def run_protocols(self):
        LOG.info('PPPoE Scenario - Start Protocols')
        self.client.start_protocols()
        utils.wait_until_true(
            lambda: self.client.is_protocols_running(self.protocols),
            timeout=WAIT_PROTOCOLS_STARTED, sleep=2)

    def stop_protocols(self):
        LOG.info('PPPoE Scenario - Stop Protocols')
        self.client.stop_protocols()

    def _get_intf_addr(self, intf):
        """Retrieve interface IP address and mask

        :param intf: could be the string which represents IP address
        with mask (e.g 192.168.10.2/24) or a dictionary with the host
        name and the port (e.g. {'tg__0': 'xe1'})
        :return: (tuple) pair of ip address and mask
        """
        if isinstance(intf, six.string_types):
            ip, mask = tuple(intf.split('/'))
            return ip, int(mask)

        node_name, intf_name = next(iter(intf.items()))
        node = self._context_cfg["nodes"].get(node_name, {})
        interface = node.get("interfaces", {})[intf_name]
        ip = interface["local_ip"]
        mask = interface["netmask"]
        ipaddr = ipaddress.ip_network(six.text_type('{}/{}'.format(ip, mask)),
                                      strict=False)
        return ip, ipaddr.prefixlen

    @staticmethod
    def _get_endpoints_src_dst_id_pairs(flows_params):
        """Get list of flows src/dst port pairs

        Create list of flows src/dst port pairs based on traffic profile
        flows data. Each uplink/downlink pair in traffic profile represents
        specific flows between the pair of ports.

        Example ('port' key represents port on which flow will be created):

        Input flows data:
        uplink_0:
          ipv4:
            id: 1
            port: xe0
        downlink_0:
          ipv4:
            id: 2
            port: xe1
        uplink_1:
          ipv4:
            id: 3
            port: xe2
        downlink_1:
          ipv4:
            id: 4
            port: xe3

        Result list: ['xe0', 'xe1', 'xe2', 'xe3']

        Result list means that the following flows pairs will be created:
        - uplink 0: port xe0 <-> port xe1
        - downlink 0: port xe1 <-> port xe0
        - uplink 1: port xe2 <-> port xe3
        - downlink 1: port xe3 <-> port xe2

        :param flows_params: ordered dict of traffic profile flows params
        :return: (list) list of flows src/dst ports
        """
        if len(flows_params) % 2:
            raise RuntimeError('Number of uplink/downlink pairs'
                               ' in traffic profile is not equal')
        endpoint_pairs = []
        for flow in flows_params:
            port = flows_params[flow]['ipv4'].get('port')
            if port is None:
                continue
            endpoint_pairs.append(port)
        return endpoint_pairs

    def _get_endpoints_src_dst_obj_pairs(self, endpoints_id_pairs):
        """Create list of uplink/downlink device groups pairs

        Based on traffic profile options, create list of uplink/downlink
        device groups pairs between which flow groups will be created:

        1. In case uplink/downlink flows in traffic profile doesn't have
           specified 'port' key, flows will be created between each device
           group on access port and device group on corresponding core port.
           E.g.:
           Device groups created on access port xe0: dg1, dg2, dg3
           Device groups created on core port xe1: dg4
           Flows will be created between:
           dg1 -> dg4
           dg4 -> dg1
           dg2 -> dg4
           dg4 -> dg2
           dg3 -> dg4
           dg4 -> dg3

        2. In case uplink/downlink flows in traffic profile have specified
           'port' key, flows will be created between device groups on this
           port.
           E.g., for the following traffic profile
           uplink_0:
             port: xe0
           downlink_0:
             port: xe1
           uplink_1:
             port: xe0
           downlink_0:
             port: xe3
           Flows will be created between:
           Port xe0 (dg1) -> Port xe1 (dg1)
           Port xe1 (dg1) -> Port xe0 (dg1)
           Port xe0 (dg2) -> Port xe3 (dg1)
           Port xe3 (dg3) -> Port xe0 (dg1)

        :param endpoints_id_pairs: (list) List of uplink/downlink flows ports
         pairs
        :return: (list) list of uplink/downlink device groups descriptors pairs
        """
        pppoe = self._ixia_cfg['pppoe_client']
        sessions_per_port = pppoe['sessions_per_port']
        sessions_per_svlan = pppoe['sessions_per_svlan']
        svlan_count = int(sessions_per_port / sessions_per_svlan)

        uplink_ports = [p['tg__0'] for p in self._ixia_cfg['flow']['src_ip']]
        downlink_ports = [p['tg__0'] for p in self._ixia_cfg['flow']['dst_ip']]
        uplink_port_topology_map = zip(uplink_ports, self._access_topologies)
        downlink_port_topology_map = zip(downlink_ports, self._core_topologies)

        port_to_dev_group_mapping = {}
        for port, topology in uplink_port_topology_map:
            topology_dgs = self.client.get_topology_device_groups(topology)
            port_to_dev_group_mapping[port] = topology_dgs
        for port, topology in downlink_port_topology_map:
            topology_dgs = self.client.get_topology_device_groups(topology)
            port_to_dev_group_mapping[port] = topology_dgs

        uplink_endpoints = endpoints_id_pairs[::2]
        downlink_endpoints = endpoints_id_pairs[1::2]

        uplink_dev_groups = []
        group_up = [uplink_endpoints[i:i + svlan_count]
                    for i in range(0, len(uplink_endpoints), svlan_count)]

        for group in group_up:
            for i, port in enumerate(group):
                uplink_dev_groups.append(port_to_dev_group_mapping[port][i])

        downlink_dev_groups = []
        for port in downlink_endpoints:
            downlink_dev_groups.append(port_to_dev_group_mapping[port][0])

        endpoint_obj_pairs = []
        [endpoint_obj_pairs.extend([up, down])
         for up, down in zip(uplink_dev_groups, downlink_dev_groups)]

        if not endpoint_obj_pairs:
            for up, down in zip(uplink_ports, downlink_ports):
                uplink_dev_groups = port_to_dev_group_mapping[up]
                downlink_dev_groups = \
                    port_to_dev_group_mapping[down] * len(uplink_dev_groups)
                [endpoint_obj_pairs.extend(list(i))
                 for i in zip(uplink_dev_groups, downlink_dev_groups)]
        return endpoint_obj_pairs

    def _fill_ixia_config(self):
        pppoe = self._ixia_cfg["pppoe_client"]
        ipv4 = self._ixia_cfg["ipv4_client"]

        _ip = [self._get_intf_addr(intf)[0] for intf in pppoe["ip"]]
        self._ixia_cfg["pppoe_client"]["ip"] = _ip

        _ip = [self._get_intf_addr(intf)[0] for intf in ipv4["gateway_ip"]]
        self._ixia_cfg["ipv4_client"]["gateway_ip"] = _ip

        addrs = [self._get_intf_addr(intf) for intf in ipv4["ip"]]
        _ip = [addr[0] for addr in addrs]
        _prefix = [addr[1] for addr in addrs]

        self._ixia_cfg["ipv4_client"]["ip"] = _ip
        self._ixia_cfg["ipv4_client"]["prefix"] = _prefix

    def _apply_access_network_config(self):
        pppoe = self._ixia_cfg["pppoe_client"]
        sessions_per_port = pppoe['sessions_per_port']
        sessions_per_svlan = pppoe['sessions_per_svlan']
        svlan_count = int(sessions_per_port / sessions_per_svlan)

        # add topology per uplink port (access network)
        for access_tp_id, vport in enumerate(self._uplink_vports):
            name = 'Topology access {}'.format(access_tp_id)
            tp = self.client.add_topology(name, vport)
            self._access_topologies.append(tp)
            # add device group per svlan
            for dg_id in range(svlan_count):
                s_vlan_id = int(pppoe['s_vlan']) + dg_id + access_tp_id * svlan_count
                s_vlan = ixnet_api.Vlan(vlan_id=s_vlan_id)
                c_vlan = ixnet_api.Vlan(vlan_id=pppoe['c_vlan'], vlan_id_step=1)
                name = 'SVLAN {}'.format(s_vlan_id)
                dg = self.client.add_device_group(tp, name, sessions_per_svlan)
                self.device_groups.append(dg)
                # add ethernet layer to device group
                ethernet = self.client.add_ethernet(dg, 'Ethernet')
                self.protocols.append(ethernet)
                self.client.add_vlans(ethernet, [s_vlan, c_vlan])
                # add ppp over ethernet
                if 'pap_user' in pppoe:
                    ppp = self.client.add_pppox_client(ethernet, 'pap',
                                                       pppoe['pap_user'],
                                                       pppoe['pap_password'])
                else:
                    ppp = self.client.add_pppox_client(ethernet, 'chap',
                                                       pppoe['chap_user'],
                                                       pppoe['chap_password'])
                self.protocols.append(ppp)

    def _apply_core_network_config(self):
        ipv4 = self._ixia_cfg["ipv4_client"]
        sessions_per_port = ipv4['sessions_per_port']
        sessions_per_vlan = ipv4['sessions_per_vlan']
        vlan_count = int(sessions_per_port / sessions_per_vlan)

        # add topology per downlink port (core network)
        for core_tp_id, vport in enumerate(self._downlink_vports):
            name = 'Topology core {}'.format(core_tp_id)
            tp = self.client.add_topology(name, vport)
            self._core_topologies.append(tp)
            # add device group per vlan
            for dg_id in range(vlan_count):
                name = 'Core port {}'.format(core_tp_id)
                dg = self.client.add_device_group(tp, name, sessions_per_vlan)
                self.device_groups.append(dg)
                # add ethernet layer to device group
                ethernet = self.client.add_ethernet(dg, 'Ethernet')
                self.protocols.append(ethernet)
                if 'vlan' in ipv4:
                    vlan_id = int(ipv4['vlan']) + dg_id + core_tp_id * vlan_count
                    vlan = ixnet_api.Vlan(vlan_id=vlan_id)
                    self.client.add_vlans(ethernet, [vlan])
                # add ipv4 layer
                gw_ip = ipv4['gateway_ip'][core_tp_id]
                # use gw addr to generate ip addr from the same network
                ip_addr = ipaddress.IPv4Address(gw_ip) + 1
                ipv4_obj = self.client.add_ipv4(ethernet, name='ipv4',
                                                addr=ip_addr,
                                                addr_step='0.0.0.1',
                                                prefix=ipv4['prefix'][core_tp_id],
                                                gateway=gw_ip)
                self.protocols.append(ipv4_obj)
                if ipv4.get("bgp"):
                    bgp_peer_obj = self.client.add_bgp(ipv4_obj,
                                                       dut_ip=ipv4["bgp"]["dut_ip"],
                                                       local_as=ipv4["bgp"]["as_number"],
                                                       bgp_type=ipv4["bgp"].get("bgp_type"))
                    self.protocols.append(bgp_peer_obj)


class IxiaRfc2544Helper(Rfc2544ResourceHelper):

    def is_done(self):
        return self.latency and self.iteration.value > 10


class IxiaResourceHelper(ClientResourceHelper):

    LATENCY_TIME_SLEEP = 120

    def __init__(self, setup_helper, rfc_helper_type=None):
        super(IxiaResourceHelper, self).__init__(setup_helper)
        self.scenario_helper = setup_helper.scenario_helper

        self._ixia_scenarios = {
            "IxiaBasic": IxiaBasicScenario,
            "IxiaL3": IxiaL3Scenario,
            "IxiaPppoeClient": IxiaPppoeClientScenario,
        }

        self.client = ixnet_api.IxNextgen()

        if rfc_helper_type is None:
            rfc_helper_type = IxiaRfc2544Helper

        self.rfc_helper = rfc_helper_type(self.scenario_helper)
        self.uplink_ports = None
        self.downlink_ports = None
        self.context_cfg = None
        self._ix_scenario = None
        self._connect()

    def _connect(self, client=None):
        self.client.connect(self.vnfd_helper)

    def get_stats(self, *args, **kwargs):
        return self.client.get_statistics()

    def setup(self):
        super(IxiaResourceHelper, self).setup()
        self._init_ix_scenario()

    def stop_collect(self):
        self._ix_scenario.stop_protocols()
        self._terminated.value = 1

    def generate_samples(self, ports, duration):
        stats = self.get_stats()

        samples = {}
        # this is not DPDK port num, but this is whatever number we gave
        # when we selected ports and programmed the profile
        for port_num in ports:
            try:
                # reverse lookup port name from port_num so the stats dict is descriptive
                intf = self.vnfd_helper.find_interface_by_port(port_num)
                port_name = intf['name']
                avg_latency = stats['Store-Forward_Avg_latency_ns'][port_num]
                min_latency = stats['Store-Forward_Min_latency_ns'][port_num]
                max_latency = stats['Store-Forward_Max_latency_ns'][port_num]
                samples[port_name] = {
                    'rx_throughput_kps': float(stats['Rx_Rate_Kbps'][port_num]),
                    'tx_throughput_kps': float(stats['Tx_Rate_Kbps'][port_num]),
                    'rx_throughput_mbps': float(stats['Rx_Rate_Mbps'][port_num]),
                    'tx_throughput_mbps': float(stats['Tx_Rate_Mbps'][port_num]),
                    'in_packets': int(stats['Valid_Frames_Rx'][port_num]),
                    'out_packets': int(stats['Frames_Tx'][port_num]),
                    'RxThroughput': float(stats['Valid_Frames_Rx'][port_num]) / duration,
                    'TxThroughput': float(stats['Frames_Tx'][port_num]) / duration,
                    'Store-Forward_Avg_latency_ns': utils.safe_cast(avg_latency, int, 0),
                    'Store-Forward_Min_latency_ns': utils.safe_cast(min_latency, int, 0),
                    'Store-Forward_Max_latency_ns': utils.safe_cast(max_latency, int, 0)
                }
            except IndexError:
                pass

        return samples

    def _init_ix_scenario(self):
        ixia_config = self.scenario_helper.scenario_cfg.get('ixia_config', 'IxiaBasic')

        if ixia_config in self._ixia_scenarios:
            scenario_type = self._ixia_scenarios[ixia_config]

            self._ix_scenario = scenario_type(self.client, self.context_cfg,
                                              self.scenario_helper.scenario_cfg['options'])
        else:
            raise RuntimeError(
                "IXIA config type '{}' not supported".format(ixia_config))

    def _initialize_client(self, traffic_profile):
        """Initialize the IXIA IxNetwork client and configure the server"""
        self.client.clear_config()
        self.client.assign_ports()
        self._ix_scenario.apply_config()
        self._ix_scenario.create_traffic_model(traffic_profile)

    def run_traffic(self, traffic_profile):
        if self._terminated.value:
            return

        min_tol = self.rfc_helper.tolerance_low
        max_tol = self.rfc_helper.tolerance_high
        precision = self.rfc_helper.tolerance_precision
        default = "00:00:00:00:00:00"

        self._build_ports()
        traffic_profile.update_traffic_profile(self)
        self._initialize_client(traffic_profile)

        mac = {}
        for port_name in self.vnfd_helper.port_pairs.all_ports:
            intf = self.vnfd_helper.find_interface(name=port_name)
            virt_intf = intf["virtual-interface"]
            # we only know static traffic id by reading the json
            # this is used by _get_ixia_trafficrofile
            port_num = self.vnfd_helper.port_num(intf)
            mac["src_mac_{}".format(port_num)] = virt_intf.get("local_mac", default)
            mac["dst_mac_{}".format(port_num)] = virt_intf.get("dst_mac", default)

        self._ix_scenario.run_protocols()

        try:
            while not self._terminated.value:
                first_run = traffic_profile.execute_traffic(
                    self, self.client, mac)
                self.client_started.value = 1
                # pylint: disable=unnecessary-lambda
                utils.wait_until_true(lambda: self.client.is_traffic_stopped(),
                                      timeout=traffic_profile.config.duration * 2)
                samples = self.generate_samples(traffic_profile.ports,
                                                traffic_profile.config.duration)

                completed, samples = traffic_profile.get_drop_percentage(
                    samples, min_tol, max_tol, precision, first_run=first_run)
                self._queue.put(samples)

                if completed:
                    self._terminated.value = 1

        except Exception:  # pylint: disable=broad-except
            LOG.exception('Run Traffic terminated')

        self._ix_scenario.stop_protocols()
        self.client_started.value = 0
        self._terminated.value = 1

    def run_test(self, traffic_profile, tasks_queue, results_queue, *args): # pragma: no cover
        LOG.info("Ixia resource_helper run_test")
        if self._terminated.value:
            return

        min_tol = self.rfc_helper.tolerance_low
        max_tol = self.rfc_helper.tolerance_high
        precision = self.rfc_helper.tolerance_precision
        default = "00:00:00:00:00:00"

        self._build_ports()
        traffic_profile.update_traffic_profile(self)
        self._initialize_client(traffic_profile)

        mac = {}
        for port_name in self.vnfd_helper.port_pairs.all_ports:
            intf = self.vnfd_helper.find_interface(name=port_name)
            virt_intf = intf["virtual-interface"]
            # we only know static traffic id by reading the json
            # this is used by _get_ixia_trafficrofile
            port_num = self.vnfd_helper.port_num(intf)
            mac["src_mac_{}".format(port_num)] = virt_intf.get("local_mac", default)
            mac["dst_mac_{}".format(port_num)] = virt_intf.get("dst_mac", default)

        self._ix_scenario.run_protocols()

        try:
            completed = False
            self.client_started.value = 1
            while completed is False and not self._terminated.value:
                LOG.info("Wait for task ...")

                try:
                    task = tasks_queue.get(True, 5)
                except moves.queue.Empty:
                    continue
                else:
                    if task != 'RUN_TRAFFIC':
                        continue

                LOG.info("Got %s task", task)
                first_run = traffic_profile.execute_traffic(
                    self, self.client, mac)
                # pylint: disable=unnecessary-lambda
                utils.wait_until_true(lambda: self.client.is_traffic_stopped(),
                                      timeout=traffic_profile.config.duration * 2)
                samples = self.generate_samples(traffic_profile.ports,
                                                traffic_profile.config.duration)

                completed, samples = traffic_profile.get_drop_percentage(
                    samples, min_tol, max_tol, precision, first_run=first_run)
                self._queue.put(samples)

                if completed:
                    LOG.debug("IxiaResourceHelper::run_test - test completed")
                    results_queue.put('COMPLETE')
                else:
                    results_queue.put('CONTINUE')
                tasks_queue.task_done()

        except Exception:  # pylint: disable=broad-except
            LOG.exception('Run Traffic terminated')

        self._ix_scenario.stop_protocols()
        self.client_started.value = 0
        LOG.debug("IxiaResourceHelper::run_test done")

    def collect_kpi(self):
        self.rfc_helper.iteration.value += 1
        return super(IxiaResourceHelper, self).collect_kpi()


class IxiaTrafficGen(SampleVNFTrafficGen):

    APP_NAME = 'Ixia'

    def __init__(self, name, vnfd, setup_env_helper_type=None, resource_helper_type=None):
        if resource_helper_type is None:
            resource_helper_type = IxiaResourceHelper

        super(IxiaTrafficGen, self).__init__(name, vnfd, setup_env_helper_type,
                                             resource_helper_type)
        self._ixia_traffic_gen = None
        self.ixia_file_name = ''
        self.vnf_port_pairs = []
        self._traffic_process = None
        self._tasks_queue = JoinableQueue()
        self._result_queue = Queue()

    def _check_status(self):
        pass

    def terminate(self):
        self.resource_helper.stop_collect()
        super(IxiaTrafficGen, self).terminate()

    def _test_runner(self, traffic_profile, tasks, results):
        self.resource_helper.run_test(traffic_profile, tasks, results)

    def _init_traffic_process(self, traffic_profile):
        name = '{}-{}-{}-{}'.format(self.name, self.APP_NAME,
                                    traffic_profile.__class__.__name__,
                                    os.getpid())
        self._traffic_process = Process(name=name, target=self._test_runner,
                                        args=(
                                        traffic_profile, self._tasks_queue,
                                        self._result_queue))

        self._traffic_process.start()
        while self.resource_helper.client_started.value == 0:
            time.sleep(1)
            if not self._traffic_process.is_alive():
                break

    def run_traffic_once(self, traffic_profile):
        if self.resource_helper.client_started.value == 0:
            self._init_traffic_process(traffic_profile)

        # continue test - run next iteration
        LOG.info("Run next iteration ...")
        self._tasks_queue.put('RUN_TRAFFIC')

    def wait_on_traffic(self):
        self._tasks_queue.join()
        result = self._result_queue.get()
        return result