from random import randint
from time import time, sleep

from google.protobuf.json_format import MessageToDict, ParseDict
from unittest import main
from voltha.protos.device_pb2 import Device
from tests.itests.voltha.rest_base import RestBase
from common.utils.consulhelpers import get_endpoint_from_consul, \
    get_all_instances_of_service
from common.utils.consulhelpers import verify_all_services_healthy
from tests.itests.docutests.test_utils import \
    run_command_to_completion_with_raw_stdout, \
    run_command_to_completion_with_stdout_in_list
from voltha.protos.voltha_pb2 import AlarmFilter
from google.protobuf.empty_pb2 import Empty
import grpc
from voltha.protos import third_party
from voltha.protos import voltha_pb2
from voltha.core.flow_decomposer import *
from voltha.protos.openflow_13_pb2 import FlowTableUpdate
from voltha.protos import bbf_fiber_base_pb2 as fb

LOCAL_CONSUL = "localhost:8500"
DOCKER_COMPOSE_FILE = "compose/docker-compose-system-test.yml"

command_defs = dict(
    docker_ps="docker ps",
    docker_compose_start_all="docker-compose -f {} up -d "
        .format(DOCKER_COMPOSE_FILE),
    docker_stop_and_remove_all_containers="docker-compose -f {} down"
        .format(DOCKER_COMPOSE_FILE),
    docker_compose_start_voltha="docker-compose -f {} up -d voltha "
        .format(DOCKER_COMPOSE_FILE),
    docker_compose_stop_voltha="docker-compose -f {} stop voltha"
        .format(DOCKER_COMPOSE_FILE),
    docker_compose_remove_voltha="docker-compose -f {} rm -f voltha"
        .format(DOCKER_COMPOSE_FILE),
    docker_compose_scale_voltha="docker-compose -f {} scale "
                                "voltha=".format(DOCKER_COMPOSE_FILE),
    kafka_topics="kafkacat -b {} -L",
    kafka_alarms="kafkacat -o end -b {} -C -t voltha.alarms -c 2",
    kafka_kpis="kafkacat -o end -b {} -C -t voltha.kpis -c 5"
)

xpon_scenario = [
    {'cterm-add': {
        'pb2': fb.ChannelterminationConfig(),
        'rpc': {
                "interface": {
                    "enabled": True,
                    "name": "PON port",
                    "description": "Channel Termination for Freedom Tower"
                    },
                "data": {
                    "channelpair_ref": "",
                    "location": "AT&T WTC OLT"
                    },
                "name": "PON port"
                }
            }
        },
    {'cterm-del': {
        'pb2': fb.ChannelterminationConfig(),
        'rpc': {"name": "PON port"}}
    }
]


class DispatcherTest(RestBase):
    def setUp(self):
        self.grpc_channels = dict()

    t0 = [time()]

    def pt(self, msg=''):
        t1 = time()
        print '%20.8f ms - %s' % (1000 * (t1 - DispatcherTest.t0[0]),
                                  msg)
        DispatcherTest.t0[0] = t1

    def wait_till(self, msg, predicate, interval=0.1, timeout=5.0):
        deadline = time() + timeout
        while time() < deadline:
            if predicate():
                return
            sleep(interval)
        self.fail('Timed out while waiting for condition: {}'.format(msg))

    def get_channel(self, voltha_grpc):
        if voltha_grpc not in self.grpc_channels:
            self.grpc_channels[voltha_grpc] = grpc.insecure_channel(
                voltha_grpc)
        return self.grpc_channels[voltha_grpc]

    def test_01_global_rest_apis(self):
        # Start the voltha ensemble with a single voltha instance
        self._stop_and_remove_all_containers()
        sleep(5)  # A small wait for the system to settle down
        self.start_all_containers()
        self.set_rest_endpoint()
        self.set_kafka_endpoint()

        self._get_root_rest()
        self._get_schema_rest()
        self._get_health_rest()
        self._get_voltha_rest()
        self._list_voltha_instances_rest()
        self._get_voltha_instance_rest()
        olt_id = self._add_olt_device_rest()
        self._verify_device_preprovisioned_state_rest(olt_id)
        self._activate_device_rest(olt_id)
        ldev_id = self._wait_for_logical_device_rest(olt_id)
        ldevices = self._list_logical_devices_rest()
        logical_device_id = ldevices['items'][0]['id']
        self._get_logical_device_rest(logical_device_id)
        self._list_logical_device_ports_rest(logical_device_id)
        self._list_and_update_logical_device_flows_rest(logical_device_id)
        self._list_and_update_logical_device_flow_groups_rest(
            logical_device_id)
        devices = self._list_devices_rest()
        device_id = devices['items'][0]['id']
        self._get_device_rest(device_id)
        self._list_device_ports_rest(device_id)
        self._list_device_flows_rest(device_id)
        self._list_device_flow_groups_rest(device_id)
        self._get_images_rest(device_id)
        self._self_test_rest(device_id)
        dtypes = self._list_device_types_rest()
        self._get_device_type_rest(dtypes['items'][0]['id'])
        alarm_filter = self._create_device_filter_rest(olt_id)
        self._remove_device_filter_rest(alarm_filter['id'])
        channel_termination = self._create_channel_termination_rest(olt_id)
        self._delete_channel_termination_rest(olt_id)
        # TODO: PM APIs test

    def test_02_cross_instances_dispatch(self):

        def prompt(input_func, text):
            val = input_func(text)
            return val

        def prompt_for_return(text):
            return raw_input(text)

        # Start the voltha ensemble with a single voltha instance
        self._stop_and_remove_all_containers()
        sleep(5)  # A small wait for the system to settle down
        self.start_all_containers()
        self.set_rest_endpoint()
        self.set_kafka_endpoint()

        # Scale voltha to 3 instances and setup the voltha grpc assigments
        self._scale_voltha(3)
        sleep(10)  # A small wait for the system to settle down
        voltha_instances = get_all_instances_of_service(LOCAL_CONSUL,
                                                        'voltha-grpc')
        self.assertEqual(len(voltha_instances), 3)
        self.ponsim_voltha_stub_local = voltha_pb2.VolthaLocalServiceStub(
            self.get_channel(self._get_grpc_address(voltha_instances[2])))
        self.ponsim_voltha_stub_global = voltha_pb2.VolthaGlobalServiceStub(
            self.get_channel(self._get_grpc_address(voltha_instances[2])))

        self.simulated_voltha_stub_local = voltha_pb2.VolthaLocalServiceStub(
            self.get_channel(self._get_grpc_address(voltha_instances[1])))
        self.simulated_voltha_stub_global = voltha_pb2.VolthaGlobalServiceStub(
            self.get_channel(self._get_grpc_address(voltha_instances[1])))

        self.empty_voltha_stub_local = voltha_pb2.VolthaLocalServiceStub(
            self.get_channel(self._get_grpc_address(voltha_instances[0])))
        self.empty_voltha_stub_global = voltha_pb2.VolthaGlobalServiceStub(
            self.get_channel(self._get_grpc_address(voltha_instances[0])))

        # Prompt the user to start ponsim
        # Get the user to start PONSIM as root
        prompt(prompt_for_return,
               '\nStart PONSIM as root in another window ...')

        prompt(prompt_for_return,
               '\nEnsure port forwarding is set on ponmgnt ...')

        # Test 1:
        # A. Get the list of adapters using a global stub
        # B. Get the list of adapters using a local stub
        # C. Verify that the two lists are the same
        adapters_g = self._get_adapters_grpc(self.ponsim_voltha_stub_global)
        adapters_l =  self._get_adapters_grpc(self.empty_voltha_stub_local)
        assert adapters_g == adapters_l

        # Test 2:
        # A. Provision a pomsim olt using the ponsim_voltha_stub
        # B. Enable the posim olt using the simulated_voltha_stub
        # C. Wait for onu discovery using the empty_voltha_stub
        ponsim_olt = self._provision_ponsim_olt_grpc(
            self.ponsim_voltha_stub_local)
        ponsim_logical_device_id = self._enable_device_grpc(
            self.simulated_voltha_stub_global,
            ponsim_olt.id)
        self._wait_for_onu_discovery_grpc(self.empty_voltha_stub_global,
                                          ponsim_olt.id,
                                          count=4)
        # Test 3:
        # A. Provision a simulated olt using the simulated_voltha_stub
        # B. Enable the simulated olt using the ponsim_voltha_stub
        # C. Wait for onu discovery using the empty_voltha_stub
        simulated_olt = self._provision_simulated_olt_grpc(
            self.simulated_voltha_stub_local)
        simulated_logical_device_id = self._enable_device_grpc(
            self.ponsim_voltha_stub_global, simulated_olt.id)
        self._wait_for_onu_discovery_grpc(self.empty_voltha_stub_global,
                                          simulated_olt.id, count=4)

        # Test 4:
        # Verify that we have at least 8 devices created using the global
        # REST and also via direct grpc in the empty stub
        devices_via_rest = self._list_devices_rest(8)['items']
        devices_via_global_grpc = self._get_devices_grpc(
            self.empty_voltha_stub_global)
        assert len(devices_via_rest) == len(devices_via_global_grpc)

        # Test 5:
        # A. Create 2 Alarms filters using REST
        # B. Ensure it is present across all instances
        # C. Ensure when requesting the alarm filters we do not get
        # duplicate results
        alarm_filter1 = self._create_device_filter_rest(ponsim_olt.id)
        alarm_filter2 = self._create_device_filter_rest(simulated_olt.id)
        global_filters = self._get_alarm_filters_rest()
        filter = self._get_alarm_filters_grpc(self.simulated_voltha_stub_local)
        assert global_filters == MessageToDict(filter)
        filter = self._get_alarm_filters_grpc(self.ponsim_voltha_stub_local)
        assert global_filters == MessageToDict(filter)
        filter = self._get_alarm_filters_grpc(self.empty_voltha_stub_local)
        assert global_filters == MessageToDict(filter)
        filter = self._get_alarm_filters_grpc(self.empty_voltha_stub_global)
        assert global_filters == MessageToDict(filter)

        # Test 6:
        # A. Delete an alarm filter
        # B. Ensure that filter is deleted from all instances
        self._remove_device_filter_rest(alarm_filter1['id'])
        previous_filters = global_filters
        global_filters = self._get_alarm_filters_rest()
        assert global_filters != previous_filters
        filter = self._get_alarm_filters_grpc(self.simulated_voltha_stub_local)
        assert global_filters == MessageToDict(filter)
        filter = self._get_alarm_filters_grpc(self.ponsim_voltha_stub_local)
        assert global_filters == MessageToDict(filter)
        filter = self._get_alarm_filters_grpc(self.empty_voltha_stub_local)
        assert global_filters == MessageToDict(filter)
        filter = self._get_alarm_filters_grpc(self.empty_voltha_stub_global)
        assert global_filters == MessageToDict(filter)

        # Test 7:
        # A. Simulate EAPOL install on ponsim instance using grpc
        # B. Validate the flows using global REST
        # C. Retrieve the flows from global grpc using empty voltha instance
        self._install_eapol_flow_grpc(self.ponsim_voltha_stub_local,
                                      ponsim_logical_device_id)
        self._verify_olt_eapol_flow_rest(ponsim_olt.id)
        res = self._get_olt_flows_grpc(self.empty_voltha_stub_global,
                                       ponsim_logical_device_id)

        # Test 8:
        # A. Create Channel Termination on particular device instance using REST
        # B. Ensuring that it is present on that specific instance
        # C. Retrieve Channel Termination from global grpc using empty
        #    voltha instance
        channel_termination = self._create_channel_termination_rest(
            ponsim_olt.id)
        global_cterm = self._get_channel_terminations_rest(ponsim_olt.id)
        cterm = self._get_channel_terminations_grpc(
            self.ponsim_voltha_stub_global, ponsim_olt.id)
        assert global_cterm == MessageToDict(cterm,
            including_default_value_fields = True,
            preserving_proto_field_name = True)
        cterm = self._get_channel_terminations_grpc(
            self.ponsim_voltha_stub_local, ponsim_olt.id)
        assert global_cterm == MessageToDict(cterm,
            including_default_value_fields = True,
            preserving_proto_field_name = True)
        #Checking with empty instance
        cterm = self._get_channel_terminations_grpc(
            self.empty_voltha_stub_global, ponsim_olt.id)
        assert global_cterm == MessageToDict(cterm,
            including_default_value_fields = True,
            preserving_proto_field_name = True)
        #Simulated OLT
        channel_termination = self._create_channel_termination_rest(
            simulated_olt.id)
        global_cterm = self._get_channel_terminations_rest(simulated_olt.id)
        cterm = self._get_channel_terminations_grpc(
            self.simulated_voltha_stub_global, simulated_olt.id)
        assert global_cterm == MessageToDict(cterm,
            including_default_value_fields = True,
            preserving_proto_field_name = True)
        cterm = self._get_channel_terminations_grpc(
            self.simulated_voltha_stub_local, simulated_olt.id)
        assert global_cterm == MessageToDict(cterm,
            including_default_value_fields = True,
            preserving_proto_field_name = True)
        #Deleting Channel Termination
        self._delete_channel_termination_rest(ponsim_olt.id)
        self._delete_channel_termination_rest(simulated_olt.id)

        # TODO:  More tests to be added as new features are added


    def _get_grpc_address(self, voltha_instance):
        address = '{}:{}'.format(voltha_instance['ServiceAddress'],
                                 voltha_instance['ServicePort'])
        return address

    def _stop_and_remove_all_containers(self):
        # check if there are any running containers first
        cmd = command_defs['docker_ps']
        out, err, rc = run_command_to_completion_with_stdout_in_list(cmd)
        self.assertEqual(rc, 0)
        if len(out) > 1:  # not counting docker ps header
            cmd = command_defs['docker_stop_and_remove_all_containers']
            out, err, rc = run_command_to_completion_with_raw_stdout(cmd)
            self.assertEqual(rc, 0)

    def start_all_containers(self):
        t0 = time()

        # start all the containers
        self.pt("Starting all containers ...")
        cmd = command_defs['docker_compose_start_all']
        out, err, rc = run_command_to_completion_with_raw_stdout(cmd)
        self.assertEqual(rc, 0)

        self.pt("Waiting for voltha and chameleon containers to be ready ...")
        self.wait_till('voltha services HEALTHY',
                       lambda: verify_all_services_healthy(
                           LOCAL_CONSUL, service_name='voltha-grpc') == True,
                       timeout=10)
        self.wait_till('chameleon services HEALTHY',
                       lambda: verify_all_services_healthy(
                           LOCAL_CONSUL,
                           service_name='chameleon-rest') == True,
                       timeout=10)

        # Chameleon takes some time to compile the protos and make them
        # available.  So let's wait 10 seconds
        sleep(10)

    def set_rest_endpoint(self):
        self.rest_endpoint = get_endpoint_from_consul(LOCAL_CONSUL,
                                                      'chameleon-rest')
        self.base_url = 'https://' + self.rest_endpoint

    def set_kafka_endpoint(self):
        self.kafka_endpoint = get_endpoint_from_consul(LOCAL_CONSUL, 'kafka')

    def _scale_voltha(self, scale=2):
        self.pt("Scaling voltha ...")
        cmd = command_defs['docker_compose_scale_voltha'] + str(scale)
        out, err, rc = run_command_to_completion_with_raw_stdout(cmd)
        self.assertEqual(rc, 0)

    def _get_root_rest(self):
        res = self.get('/', expected_content_type='text/html')
        self.assertGreaterEqual(res.find('swagger'), 0)

    def _get_schema_rest(self):
        res = self.get('/schema')
        self.assertEqual(set(res.keys()),
                         {'protos', 'yang_from', 'swagger_from'})

    def _get_health_rest(self):
        res = self.get('/health')
        self.assertEqual(res['state'], 'HEALTHY')

    # ~~~~~~~~~~~~~~~~~~~~~ TOP LEVEL VOLTHA OPERATIONS ~~~~~~~~~~~~~~~~~~~~~~~

    def _get_voltha_rest(self):
        res = self.get('/api/v1')
        self.assertEqual(res['version'], '0.9.0')

    def _list_voltha_instances_rest(self):
        res = self.get('/api/v1/instances')
        self.assertEqual(len(res['items']), 1)

    def _get_voltha_instance_rest(self):
        res = self.get('/api/v1/instances')
        voltha_id = res['items'][0]
        res = self.get('/api/v1/instances/{}'.format(voltha_id))
        self.assertEqual(res['version'], '0.9.0')

    def _add_olt_device_rest(self, grpc=None):
        device = Device(
            type='simulated_olt',
            mac_address='00:00:00:00:00:01'
        )
        device = self.post('/api/v1/devices', MessageToDict(device),
                           expected_code=200)
        return device['id']

    def _provision_simulated_olt_grpc(self, stub):
        device = Device(
            type='simulated_olt',
            mac_address='00:00:00:00:00:01'
        )
        device = stub.CreateDevice(device)
        return device

    def _provision_ponsim_olt_grpc(self, stub):
        device = Device(
            type='ponsim_olt',
            host_and_port='172.17.0.1:50060'
        )
        device = stub.CreateDevice(device)
        return device

    def _enable_device_grpc(self, stub, device_id):
        logical_device_id = None
        try:
            stub.EnableDevice(voltha_pb2.ID(id=device_id))
            while True:
                device = stub.GetDevice(voltha_pb2.ID(id=device_id))
                # If this is an OLT then acquire logical device id
                if device.oper_status == voltha_pb2.OperStatus.ACTIVE:
                    if device.type.endswith('_olt'):
                        assert device.parent_id
                        logical_device_id = device.parent_id
                        self.pt('success (logical device id = {})'.format(
                            logical_device_id))
                    else:
                        self.pt('success (device id = {})'.format(device.id))
                    break
                self.pt('waiting for device to be enabled...')
                sleep(.5)
        except Exception, e:
            self.pt('Error enabling {}.  Error:{}'.format(device_id, e))
        return logical_device_id

    def _delete_device_grpc(self, stub, device_id):
        try:
            stub.DeleteDevice(voltha_pb2.ID(id=device_id))
            while True:
                device = stub.GetDevice(voltha_pb2.ID(id=device_id))
                assert not device
        except Exception, e:
            self.pt('deleting device {}.  Error:{}'.format(device_id, e))

    def _get_devices_grpc(self, stub):
        res = stub.ListDevices(Empty())
        return res.items

    def _get_adapters_grpc(self, stub):
        res = stub.ListAdapters(Empty())
        return res.items

    def _find_onus_grpc(self, stub, olt_id):
        devices = self._get_devices_grpc(stub)
        return [
            d for d in devices
            if d.parent_id == olt_id
        ]

    def _wait_for_onu_discovery_grpc(self, stub, olt_id, count=4):
        # shortly after we shall see the discovery of four new onus, linked to
        # the olt device
        self.wait_till(
            'find ONUs linked to the olt device',
            lambda: len(self._find_onus_grpc(stub, olt_id)) >= count,
            2
        )
        # verify that they are properly set
        onus = self._find_onus_grpc(stub, olt_id)
        for onu in onus:
            self.assertEqual(onu.admin_state, 3)  # ENABLED
            self.assertEqual(onu.oper_status, 4)  # ACTIVE

        return [onu.id for onu in onus]

    def _verify_device_preprovisioned_state_rest(self, olt_id):
        # we also check that so far what we read back is same as what we get
        # back on create
        device = self.get('/api/v1/devices/{}'.format(olt_id))
        self.assertNotEqual(device['id'], '')
        self.assertEqual(device['adapter'], 'simulated_olt')
        self.assertEqual(device['admin_state'], 'PREPROVISIONED')
        self.assertEqual(device['oper_status'], 'UNKNOWN')

    def _activate_device_rest(self, olt_id):
        path = '/api/v1/devices/{}'.format(olt_id)
        self.post(path + '/enable', expected_code=200)
        device = self.get(path)
        self.assertEqual(device['admin_state'], 'ENABLED')

        self.wait_till(
            'admin state moves to ACTIVATING or ACTIVE',
            lambda: self.get(path)['oper_status'] in ('ACTIVATING', 'ACTIVE'),
            timeout=0.5)

        # eventually, it shall move to active state and by then we shall have
        # device details filled, connect_state set, and device ports created
        self.wait_till(
            'admin state ACTIVE',
            lambda: self.get(path)['oper_status'] == 'ACTIVE',
            timeout=0.5)
        device = self.get(path)
        images = device['images']
        image = images['image']
        image_1 = image[0]
        version = image_1['version']
        self.assertNotEqual(version, '')
        self.assertEqual(device['connect_status'], 'REACHABLE')

        ports = self.get(path + '/ports')['items']
        self.assertEqual(len(ports), 2)

    def _wait_for_logical_device_rest(self, olt_id):
        # we shall find the logical device id from the parent_id of the olt
        # (root) device
        device = self.get(
            '/api/v1/devices/{}'.format(olt_id))
        self.assertNotEqual(device['parent_id'], '')
        logical_device = self.get(
            '/api/v1/logical_devices/{}'.format(device['parent_id']))

        # the logical device shall be linked back to the hard device,
        # its ports too
        self.assertEqual(logical_device['root_device_id'], device['id'])

        logical_ports = self.get(
            '/api/v1/logical_devices/{}/ports'.format(
                logical_device['id'])
        )['items']
        self.assertGreaterEqual(len(logical_ports), 1)
        logical_port = logical_ports[0]
        self.assertEqual(logical_port['id'], 'nni')
        self.assertEqual(logical_port['ofp_port']['name'], 'nni')
        self.assertEqual(logical_port['ofp_port']['port_no'], 129)
        self.assertEqual(logical_port['device_id'], device['id'])
        self.assertEqual(logical_port['device_port_no'], 2)
        return logical_device['id']

    def _list_logical_devices_rest(self):
        res = self.get('/api/v1/logical_devices')
        self.assertGreaterEqual(len(res['items']), 1)
        return res

    def _get_logical_device_rest(self, id):
        res = self.get('/api/v1/logical_devices/{}'.format(id))
        self.assertIsNotNone(res['datapath_id'])

    def _list_logical_device_ports_rest(self, id):
        res = self.get('/api/v1/logical_devices/{}/ports'.format(id))
        self.assertGreaterEqual(len(res['items']), 1)

    def _list_and_update_logical_device_flows_rest(self, id):

        # retrieve flow list
        res = self.get('/api/v1/logical_devices/{}/flows'.format(id))
        len_before = len(res['items'])

        # add some flows
        req = ofp.FlowTableUpdate(
            id=id,
            flow_mod=mk_simple_flow_mod(
                cookie=randint(1, 10000000000),
                priority=len_before,
                match_fields=[
                    in_port(129)
                ],
                actions=[
                    output(1)
                ]
            )
        )
        res = self.post('/api/v1/logical_devices/{}/flows'.format(id),
                        MessageToDict(req, preserving_proto_field_name=True),
                        expected_code=200)
        # TODO check some stuff on res

        res = self.get('/api/v1/logical_devices/{}/flows'.format(id))
        len_after = len(res['items'])
        self.assertGreater(len_after, len_before)

    def _list_and_update_logical_device_flow_groups_rest(self, id):

        # retrieve flow list
        res = self.get('/api/v1/logical_devices/{}/flow_groups'.format(id))
        len_before = len(res['items'])

        # add some flows
        req = ofp.FlowGroupTableUpdate(
            id=id,
            group_mod=ofp.ofp_group_mod(
                command=ofp.OFPGC_ADD,
                type=ofp.OFPGT_ALL,
                group_id=len_before + 1,
                buckets=[
                    ofp.ofp_bucket(
                        actions=[
                            ofp.ofp_action(
                                type=ofp.OFPAT_OUTPUT,
                                output=ofp.ofp_action_output(
                                    port=1
                                )
                            )
                        ]
                    )
                ]
            )
        )
        res = self.post('/api/v1/logical_devices/{}/flow_groups'.format(id),
                        MessageToDict(req, preserving_proto_field_name=True),
                        expected_code=200)
        # TODO check some stuff on res

        res = self.get('/api/v1/logical_devices/{}/flow_groups'.format(id))
        len_after = len(res['items'])
        self.assertGreater(len_after, len_before)

    def _list_devices_rest(self, count=2):
        res = self.get('/api/v1/devices')
        self.assertGreaterEqual(len(res['items']), count)
        return res

    def _get_device_rest(self, id):
        res = self.get('/api/v1/devices/{}'.format(id))
        # TODO test result

    def _list_device_ports_rest(self, id, count=2):
        res = self.get('/api/v1/devices/{}/ports'.format(id))
        self.assertGreaterEqual(len(res['items']), count)

    def _list_device_flows_rest(self, id, count=1):
        # pump some flows into the logical device
        res = self.get('/api/v1/devices/{}/flows'.format(id))
        self.assertGreaterEqual(len(res['items']), count)

    def _list_device_flow_groups_rest(self, id, count=0):
        res = self.get('/api/v1/devices/{}/flow_groups'.format(id))
        self.assertGreaterEqual(len(res['items']), count)

    def _list_device_types_rest(self, count=2):
        res = self.get('/api/v1/device_types')
        self.assertGreaterEqual(len(res['items']), count)
        return res

    def _get_device_type_rest(self, dtype):
        res = self.get('/api/v1/device_types/{}'.format(dtype))
        self.assertIsNotNone(res)
        # TODO test the result

    def _list_device_groups(self):
        pass
        # res = self.get('/api/v1/device_groups')
        # self.assertGreaterEqual(len(res['items']), 1)

    def _get_device_group(self):
        pass
        # res = self.get('/api/v1/device_groups/1')
        # # TODO test the result

    def _get_images_rest(self, id):
        res = self.get('/api/v1/devices/{}/images'.format(id))
        self.assertIsNotNone(res)

    def _self_test_rest(self, id):
        res = self.post('/api/v1/devices/{}/self_test'.format(id),
                        expected_code=200)
        self.assertIsNotNone(res)

    def _create_device_filter_rest(self, device_id):
        rules = list()
        rule = dict()

        # Create a filter with a single rule
        rule['key'] = 'device_id'
        rule['value'] = device_id
        rules.append(rule)

        alarm_filter = AlarmFilter(rules=rules)
        alarm_filter = self.post('/api/v1/alarm_filters',
                                 MessageToDict(alarm_filter),
                                 expected_code=200)
        self.assertIsNotNone(alarm_filter)
        return alarm_filter

    def _remove_device_filter_rest(self, alarm_filter_id):
        path = '/api/v1/alarm_filters/{}'.format(alarm_filter_id)
        self.delete(path, expected_code=200)
        alarm_filter = self.get(path, expected_code=404)
        self.assertIsNone(alarm_filter)

    def _get_alarm_filter_grpc(self, stub, alarm_filter_id):
        res = stub.GetAlarmFilter(voltha_pb2.ID(id=alarm_filter_id))
        return res

    def _get_alarm_filters_grpc(self, stub):
        res = stub.ListAlarmFilters(Empty())
        return res

    def _get_alarm_filters_rest(self):
        res = self.get('/api/v1/alarm_filters')
        return res

    def _install_eapol_flow_grpc(self, stub, logical_device_id):
        """
        Install an EAPOL flow on the given logical device. If device is not
        given, it will be applied to logical device of the last pre-provisioned
        OLT device.
        """

        # gather NNI and UNI port IDs
        nni_port_no, unis = self._get_logical_ports(stub, logical_device_id)

        # construct and push flow rule
        for uni_port_no, _ in unis:
            update = FlowTableUpdate(
                id=logical_device_id,
                flow_mod=mk_simple_flow_mod(
                    priority=2000,
                    match_fields=[in_port(uni_port_no), eth_type(0x888e)],
                    actions=[
                        # push_vlan(0x8100),
                        # set_field(vlan_vid(4096 + 4000)),
                        output(ofp.OFPP_CONTROLLER)
                    ]
                )
            )
            res = stub.UpdateLogicalDeviceFlowTable(update)
            self.pt('success for uni {} ({})'.format(uni_port_no, res))

    def _get_logical_ports(self, stub, logical_device_id):
        """
        Return the NNI port number and the first usable UNI port of logical
        device, and the vlan associated with the latter.
        """
        ports = stub.ListLogicalDevicePorts(
            voltha_pb2.ID(id=logical_device_id)).items
        nni = None
        unis = []
        for port in ports:
            if port.root_port:
                assert nni is None, "There shall be only one root port"
                nni = port.ofp_port.port_no
            else:
                uni = port.ofp_port.port_no
                uni_device = self._get_device_grpc(stub, port.device_id)
                vlan = uni_device.vlan
                unis.append((uni, vlan))

        assert nni is not None, "No NNI port found"
        assert unis, "Not a single UNI?"

        return nni, unis

    def _get_device_grpc(self, stub, device_id, depth=0):
        res = stub.GetDevice(voltha_pb2.ID(id=device_id),
                             metadata=(('get-depth', str(depth)),))
        return res

    def _verify_olt_eapol_flow_rest(self, logical_device_id):
        flows = self.get('/api/v1/devices/{}/flows'.format(logical_device_id))[
            'items']
        self.assertEqual(len(flows), 2)
        flow = flows[1]
        self.assertEqual(flow['table_id'], 0)
        self.assertEqual(flow['priority'], 2000)


    def _get_olt_flows_grpc(self, stub, logical_device_id):
        res = stub.ListLogicalDeviceFlows(voltha_pb2.ID(id=logical_device_id))
        return res

    #For xPon objects
    def _get_channel_terminations_rest(self, device_id):
        res = self.get('/api/v1/devices/{}/channel_terminations'.format(
            device_id))
        return res

    def _get_channel_terminations_grpc(self, stub, device_id):
        res = stub.GetAllChannelterminationConfig(voltha_pb2.ID(id=device_id))
        return res

    def _create_channel_termination_rest(self, device_id):
        value = xpon_scenario[0]['cterm-add']
        ParseDict(value['rpc'], value['pb2'])
        request = value['pb2']
        self.post('/api/v1/devices/{}/channel_terminations/{}'.format(
            device_id, value['rpc']['name']),
                  MessageToDict(request, preserving_proto_field_name = True),
                  expected_code = 200)
        return request

    def _delete_channel_termination_rest(self, device_id):
        value = xpon_scenario[1]['cterm-del']
        self.delete('/api/v1/devices/{}/channel_terminations/{}/delete'.format(
            device_id, value['rpc']['name']),
                  expected_code = 200)

if __name__ == '__main__':
    main()