aboutsummaryrefslogtreecommitdiffstats
path: root/tools/pkt_gen/xena/xena_json.py
blob: 971426cf27061b79752a8faabbf5d79b82f51bbf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
# Copyright 2016 Red Hat Inc & Xena Networks.
#
# 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.

# Contributors:
#   Dan Amzulescu, Xena Networks
#   Christian Trautman, Red Hat Inc.
#
# Usage can be seen below in unit test. This implementation is designed for one
# module two port Xena chassis runs only.

"""
Xena JSON module
"""

import base64
from collections import OrderedDict
import json
import locale
import logging
import uuid

import scapy.layers.inet as inet

_LOGGER = logging.getLogger(__name__)
_LOCALE = locale.getlocale()[1]


class XenaJSON(object):
    """
    Class to modify and read Xena JSON configuration files.
    """
    def __init__(self, json_path='./profiles/baseconfig.x2544'):
        """
        Constructor
        :param json_path: path to JSON file to read. Expected files must have
         two module ports with each port having its own stream config profile.
        :return: XenaJSON object
        """
        self.json_data = read_json_file(json_path)

        self.packet_data = OrderedDict()
        self.packet_data['layer2'] = None
        self.packet_data['vlan'] = None
        self.packet_data['layer3'] = None
        self.packet_data['layer4'] = None

    def _add_multistream_layer(self, entity, seg_uuid, stop_value, layer):
        """
        Add the multi stream layers to the json file based on the layer provided
        :param entity: Entity to append the segment to in entity list
        :param seg_uuid: The UUID to attach the multistream layer to
        :param stop_value: The number of flows to configure
        :param layer: the layer that the multistream will be attached to
        :return: None
        """
        field_name = {
            2: ('Dst MAC addr', 'Src MAC addr'),
            3: ('Dest IP Addr', 'Src IP Addr'),
            4: ('Dest Port', 'Src Port')
        }
        segments = [
            {
                "Offset": 0,
                "Mask": "//8=",  # mask of 255/255
                "Action": "INC",
                "StartValue": 0,
                "StopValue": stop_value,
                "StepValue": 1,
                "RepeatCount": 1,
                "SegmentId": seg_uuid,
                "FieldName": field_name[int(layer)][0]
            },
            {
                "Offset": 0,
                "Mask": "//8=",  # mask of 255/255
                "Action": "INC",
                "StartValue": 0,
                "StopValue": stop_value,
                "StepValue": 1,
                "RepeatCount": 1,
                "SegmentId": seg_uuid,
                "FieldName": field_name[int(layer)][1]
            }
        ]

        self.json_data['StreamProfileHandler']['EntityList'][entity][
            'StreamConfig']['HwModifiers'].append(segments)

    def _create_packet_header(self):
        """
        Create the scapy packet header based on what has been built in this
        instance using the set header methods. Return tuple of the two byte
        arrays, one for each port.
        :return: Scapy packet headers as bytearrays
        """
        if not self.packet_data['layer2']:
            _LOGGER.warning('Using dummy info for layer 2 in Xena JSON file')
            self.set_header_layer2()
        packet1, packet2 = (self.packet_data['layer2'][0],
                            self.packet_data['layer2'][1])
        for packet_header in list(self.packet_data.copy().values())[1:]:
            if packet_header:
                packet1 /= packet_header[0]
                packet2 /= packet_header[1]
        ret = (bytes(packet1), bytes(packet2))
        return ret

    def add_header_segments(self, flows=0, multistream_layer=None):
        """
        Build the header segments to write to the JSON file.
        :param flows: Number of flows to configure for multistream if enabled
        :param multistream_layer: layer to set multistream flows as string.
        Acceptable values are L2, L3 or L4
        :return: None
        """
        packet = self._create_packet_header()
        segment1 = list()
        segment2 = list()
        header_pos = 0
        if self.packet_data['layer2']:
            # slice out the layer 2 bytes from the packet header byte array
            layer2 = packet[0][header_pos: len(self.packet_data['layer2'][0])]
            seg = create_segment(
                "ETHERNET", encode_byte_array(layer2).decode(_LOCALE))
            if multistream_layer == 'L2' and flows > 0:
                self._add_multistream_layer(entity=0, seg_uuid=seg['ItemID'],
                                            stop_value=flows, layer=2)
            segment1.append(seg)
            # now do the other port data with reversed src, dst info
            layer2 = packet[1][header_pos: len(self.packet_data['layer2'][1])]
            seg = create_segment(
                "ETHERNET", encode_byte_array(layer2).decode(_LOCALE))
            segment2.append(seg)
            if multistream_layer == 'L2' and flows > 0:
                self._add_multistream_layer(entity=1, seg_uuid=seg['ItemID'],
                                            stop_value=flows, layer=2)
            header_pos = len(layer2)
        if self.packet_data['vlan']:
            # slice out the vlan bytes from the packet header byte array
            vlan = packet[0][header_pos: len(
                self.packet_data['vlan'][0]) + header_pos]
            segment1.append(create_segment(
                "VLAN", encode_byte_array(vlan).decode(_LOCALE)))
            segment2.append(create_segment(
                "VLAN", encode_byte_array(vlan).decode(_LOCALE)))
            header_pos += len(vlan)
        if self.packet_data['layer3']:
            # slice out the layer 3 bytes from the packet header byte array
            layer3 = packet[0][header_pos: len(
                self.packet_data['layer3'][0]) + header_pos]
            seg = create_segment(
                "IP", encode_byte_array(layer3).decode(_LOCALE))
            segment1.append(seg)
            if multistream_layer == 'L3' and flows > 0:
                self._add_multistream_layer(entity=0, seg_uuid=seg['ItemID'],
                                            stop_value=flows, layer=3)
            # now do the other port data with reversed src, dst info
            layer3 = packet[1][header_pos: len(
                self.packet_data['layer3'][1]) + header_pos]
            seg = create_segment(
                "IP", encode_byte_array(layer3).decode(_LOCALE))
            segment2.append(seg)
            if multistream_layer == 'L3' and flows > 0:
                self._add_multistream_layer(entity=1, seg_uuid=seg['ItemID'],
                                            stop_value=flows, layer=3)
            header_pos += len(layer3)
        if self.packet_data['layer4']:
            # slice out the layer 4 bytes from the packet header byte array
            layer4 = packet[0][header_pos: len(
                self.packet_data['layer4'][0]) + header_pos]
            seg = create_segment(
                "UDP", encode_byte_array(layer4).decode(_LOCALE))
            segment1.append(seg)
            if multistream_layer == 'L4' and flows > 0:
                self._add_multistream_layer(entity=0, seg_uuid=seg['ItemID'],
                                            stop_value=flows, layer=4)
            # now do the other port data with reversed src, dst info
            layer4 = packet[1][header_pos: len(
                self.packet_data['layer4'][1]) + header_pos]
            seg = create_segment(
                "UDP", encode_byte_array(layer4).decode(_LOCALE))
            segment2.append(seg)
            if multistream_layer == 'L4' and flows > 0:
                self._add_multistream_layer(entity=1, seg_uuid=seg['ItemID'],
                                            stop_value=flows, layer=4)
            header_pos += len(layer4)

        self.json_data['StreamProfileHandler']['EntityList'][0][
            'StreamConfig']['HeaderSegments'] = segment1
        self.json_data['StreamProfileHandler']['EntityList'][1][
            'StreamConfig']['HeaderSegments'] = segment2

    def disable_back2back_test(self):
        """
        Disable the rfc2544 back to back test
        :return: None
        """
        self.json_data['TestOptions']['TestTypeOptionMap']['Back2Back'][
            'Enabled'] = 'false'

    def disable_throughput_test(self):
        """
        Disable the rfc2544 throughput test
        :return: None
        """
        self.json_data['TestOptions']['TestTypeOptionMap']['Throughput'][
            'Enabled'] = 'false'

    def enable_back2back_test(self):
        """
        Enable the rfc2544 back to back test
        :return: None
        """
        self.json_data['TestOptions']['TestTypeOptionMap']['Back2Back'][
            'Enabled'] = 'true'

    def enable_throughput_test(self):
        """
        Enable the rfc2544 throughput test
        :return: None
        """
        self.json_data['TestOptions']['TestTypeOptionMap']['Throughput'][
            'Enabled'] = 'true'

    def set_chassis_info(self, hostname, pwd):
        """
        Set the chassis info
        :param hostname: hostname as string of ip
        :param pwd: password to chassis as string
        :return: None
        """
        self.json_data['ChassisManager']['ChassisList'][0][
            'HostName'] = hostname
        self.json_data['ChassisManager']['ChassisList'][0][
            'Password'] = pwd

    def set_header_layer2(self, dst_mac='cc:cc:cc:cc:cc:cc',
                          src_mac='bb:bb:bb:bb:bb:bb', **kwargs):
        """
        Build a scapy Ethernet L2 objects inside instance packet_data structure
        :param dst_mac: destination mac as string. Example "aa:aa:aa:aa:aa:aa"
        :param src_mac: source mac as string. Example "bb:bb:bb:bb:bb:bb"
        :param kwargs: Extra params per scapy usage.
        :return: None
        """
        self.packet_data['layer2'] = [
            inet.Ether(dst=dst_mac, src=src_mac, **kwargs),
            inet.Ether(dst=src_mac, src=dst_mac, **kwargs)]

    def set_header_layer3(self, src_ip='192.168.0.2', dst_ip='192.168.0.3',
                          protocol='UDP', **kwargs):
        """
        Build scapy IPV4 L3 objects inside instance packet_data structure
        :param src_ip: source IP as string in dot notation format
        :param dst_ip: destination IP as string in dot notation format
        :param protocol: protocol for l4
        :param kwargs: Extra params per scapy usage
        :return: None
        """
        self.packet_data['layer3'] = [
            inet.IP(src=src_ip, dst=dst_ip, proto=protocol.lower(), **kwargs),
            inet.IP(src=dst_ip, dst=src_ip, proto=protocol.lower(), **kwargs)]

    def set_header_layer4_udp(self, source_port, destination_port, **kwargs):
        """
        Build scapy UDP L4 objects inside instance packet_data structure
        :param source_port: Source port as int
        :param destination_port: Destination port as int
        :param kwargs: Extra params per scapy usage
        :return: None
        """
        self.packet_data['layer4'] = [
            inet.UDP(sport=source_port, dport=destination_port, **kwargs),
            inet.UDP(sport=source_port, dport=destination_port, **kwargs)]

    def set_header_vlan(self, vlan_id=1, **kwargs):
        """
        Build a Dot1Q scapy object inside instance packet_data structure
        :param vlan_id: The VLAN ID
        :param kwargs: Extra params per scapy usage
        :return: None
        """
        self.packet_data['vlan'] = [
            inet.Dot1Q(vlan=vlan_id, **kwargs),
            inet.Dot1Q(vlan=vlan_id, **kwargs)]

    def set_port(self, index, module, port):
        """
        Set the module and port for the 0 index port to use with the test
        :param index: Index of port to set, 0 = port1, 1=port2, etc..
        :param module: module location as int
        :param port: port location in module as int
        :return: None
        """
        self.json_data['PortHandler']['EntityList'][index]['PortRef'][
            'ModuleIndex'] = module
        self.json_data['PortHandler']['EntityList'][index]['PortRef'][
            'PortIndex'] = port

    def set_port_ip_v4(self, port, ip_addr, netmask, gateway):
        """
        Set the port IP info
        :param port: port number as int of port to set ip info
        :param ip_addr: ip address in dot notation format as string
        :param netmask: cidr number for netmask (ie 24/16/8) as int
        :param gateway: gateway address in dot notation format
        :return: None
        """
        available_ports = range(len(
            self.json_data['PortHandler']['EntityList']))
        if port not in available_ports:
            raise ValueError("{}{}{}".format(
                'Port assignment must be an available port ',
                'number in baseconfig file. Port=', port))
        self.json_data['PortHandler']['EntityList'][
            port]["IpV4Address"] = ip_addr
        self.json_data['PortHandler']['EntityList'][
            port]["IpV4Gateway"] = gateway
        self.json_data['PortHandler']['EntityList'][
            port]["IpV4RoutingPrefix"] = int(netmask)

    def set_port_ip_v6(self, port, ip_addr, netmask, gateway):
        """
        Set the port IP info
        :param port: port number as int of port to set ip info
        :param ip_addr: ip address as 8 groups of 4 hexadecimal groups separated
         by a colon.
        :param netmask: cidr number for netmask (ie 24/16/8) as int
        :param gateway: gateway address as string in 8 group of 4 hexadecimal
                        groups separated by a colon.
        :return: None
        """
        available_ports = range(len(
            self.json_data['PortHandler']['EntityList']))
        if port not in available_ports:
            raise ValueError("{}{}{}".format(
                'Port assignment must be an available port ',
                'number in baseconfig file. Port=', port))
        self.json_data['PortHandler']['EntityList'][
            port]["IpV6Address"] = ip_addr
        self.json_data['PortHandler']['EntityList'][
            port]["IpV6Gateway"] = gateway
        self.json_data['PortHandler']['EntityList'][
            port]["IpV6RoutingPrefix"] = int(netmask)

    def set_test_options(self, packet_sizes, duration, iterations, loss_rate,
                         micro_tpld=False):
        """
        Set the test options
        :param packet_sizes: List of packet sizes to test, single int entry is
         acceptable for one packet size testing
        :param duration: time for each test in seconds as int
        :param iterations: number of iterations of testing as int
        :param loss_rate: acceptable loss rate as float
        :param micro_tpld: boolean if micro_tpld should be enabled or disabled
        :return: None
        """
        if isinstance(packet_sizes, int):
            packet_sizes = [packet_sizes]
        self.json_data['TestOptions']['PacketSizes'][
            'CustomPacketSizes'] = packet_sizes
        self.json_data['TestOptions']['TestTypeOptionMap']['Throughput'][
            'Duration'] = duration
        self.json_data['TestOptions']['TestTypeOptionMap']['Throughput'][
            'RateIterationOptions']['AcceptableLoss'] = loss_rate
        self.json_data['TestOptions']['FlowCreationOptions'][
            'UseMicroTpldOnDemand'] = 'true' if micro_tpld else 'false'
        self.json_data['TestOptions']['TestTypeOptionMap']['Throughput'][
            'Iterations'] = iterations

    def set_topology_blocks(self):
        """
        Set the test topology to a West to East config for half duplex flow with
        port 0 as the sender and port 1 as the receiver.
        :return: None
        """
        self.json_data['TestOptions']['TopologyConfig']['Topology'] = 'BLOCKS'
        self.json_data['TestOptions']['TopologyConfig'][
            'Direction'] = 'WEST_EAST'
        self.json_data['PortHandler']['EntityList'][0][
            'PortGroup'] = "WEST"
        self.json_data['PortHandler']['EntityList'][1][
            'PortGroup'] = "EAST"

    def set_topology_mesh(self):
        """
        Set the test topology to Mesh for bi directional full duplex flow
        :return: None
        """
        self.json_data['TestOptions']['TopologyConfig']['Topology'] = 'MESH'
        self.json_data['TestOptions']['TopologyConfig']['Direction'] = 'BIDIR'
        self.json_data['PortHandler']['EntityList'][0][
            'PortGroup'] = "UNDEFINED"
        self.json_data['PortHandler']['EntityList'][1][
            'PortGroup'] = "UNDEFINED"

    def write_config(self, path='./2bUsed.x2544'):
        """
        Write the config to out as file
        :param path: Output file to export the json data to
        :return: None
        """
        if not write_json_file(self.json_data, path):
            raise RuntimeError("Could not write out file, please check config")


def create_segment(header_type, encode_64_string):
    """
    Create segment for JSON file
    :param header_type: Type of header as string
    :param encode_64_string: 64 byte encoded string value of the hex bytes
    :return: segment as dictionary
    """
    return {
        "SegmentType": header_type.upper(),
        "SegmentValue": encode_64_string,
        "ItemID": str(uuid.uuid4()),
        "ParentID": "",
        "Label": ""}


def decode_byte_array(enc_str):
    """ Decodes the base64-encoded string to a byte array
    :param enc_str: The base64-encoded string representing a byte array
    :return: The decoded byte array
    """
    dec_string = base64.b64decode(enc_str)
    barray = bytearray()
    barray.extend(dec_string)
    return barray


def encode_byte_array(byte_arr):
    """ Encodes the byte array as a base64-encoded string
    :param byte_arr: A bytearray containing the bytes to convert
    :return: A base64 encoded string
    """
    enc_string = base64.b64encode(bytes(byte_arr))
    return enc_string


def print_json_report(json_data):
    """
    Print out info from the json data for testing purposes only.
    :param json_data: json loaded data from json.loads
    :return: None
    """
    print("<<Xena JSON Config Report>>\n")
    try:
        print("### Chassis Info ###")
        print("Chassis IP: {}".format(json_data['ChassisManager'][
            'ChassisList'][0]['HostName']))
        print("Chassis Password: {}".format(json_data['ChassisManager'][
            'ChassisList'][0]['Password']))
        print("### Port Configuration ###")
        print("Port 1 IPv4:{}/{} gateway:{}".format(
            json_data['PortHandler']['EntityList'][0]["IpV4Address"],
            json_data['PortHandler']['EntityList'][0]["IpV4RoutingPrefix"],
            json_data['PortHandler']['EntityList'][0]["IpV4Gateway"]))
        print("Port 1 IPv6:{}/{} gateway:{}".format(
            json_data['PortHandler']['EntityList'][0]["IpV6Address"],
            json_data['PortHandler']['EntityList'][0]["IpV6RoutingPrefix"],
            json_data['PortHandler']['EntityList'][0]["IpV6Gateway"]))
        print("Port 2 IPv4:{}/{} gateway:{}".format(
            json_data['PortHandler']['EntityList'][1]["IpV4Address"],
            json_data['PortHandler']['EntityList'][1]["IpV4RoutingPrefix"],
            json_data['PortHandler']['EntityList'][1]["IpV4Gateway"]))
        print("Port 2 IPv6:{}/{} gateway:{}".format(
            json_data['PortHandler']['EntityList'][1]["IpV6Address"],
            json_data['PortHandler']['EntityList'][1]["IpV6RoutingPrefix"],
            json_data['PortHandler']['EntityList'][1]["IpV6Gateway"]))
        print("Port 1: {}/{} group: {}".format(
            json_data['PortHandler']['EntityList'][0]['PortRef']['ModuleIndex'],
            json_data['PortHandler']['EntityList'][0]['PortRef']['PortIndex'],
            json_data['PortHandler']['EntityList'][0]['PortGroup']))
        print("Port 2: {}/{} group: {}".format(
            json_data['PortHandler']['EntityList'][1]['PortRef']['ModuleIndex'],
            json_data['PortHandler']['EntityList'][1]['PortRef']['PortIndex'],
            json_data['PortHandler']['EntityList'][1]['PortGroup']))
        print("### Tests Enabled ###")
        print("Back2Back Enabled: {}".format(json_data['TestOptions'][
            'TestTypeOptionMap']['Back2Back']['Enabled']))
        print("Throughput Enabled: {}".format(json_data['TestOptions'][
            'TestTypeOptionMap']['Throughput']['Enabled']))
        print("### Test Options ###")
        print("Test topology: {}/{}".format(
            json_data['TestOptions']['TopologyConfig']['Topology'],
            json_data['TestOptions']['TopologyConfig']['Direction']))
        print("Packet Sizes: {}".format(json_data['TestOptions'][
            'PacketSizes']['CustomPacketSizes']))
        print("Test duration: {}".format(json_data['TestOptions'][
            'TestTypeOptionMap']['Throughput']['Duration']))
        print("Acceptable loss rate: {}".format(json_data['TestOptions'][
            'TestTypeOptionMap']['Throughput']['RateIterationOptions'][
                'AcceptableLoss']))
        print("Micro TPLD enabled: {}".format(json_data['TestOptions'][
            'FlowCreationOptions']['UseMicroTpldOnDemand']))
        print("Test iterations: {}".format(json_data['TestOptions'][
            'TestTypeOptionMap']['Throughput']['Iterations']))
        if 'StreamConfig' in json_data['StreamProfileHandler']['EntityList'][0]:
            print("### Header segments ###")
            for seg in json_data['StreamProfileHandler']['EntityList']:
                for header in seg['StreamConfig']['HeaderSegments']:
                    print("Type: {}".format(
                        header['SegmentType']))
                    print("Value: {}".format(decode_byte_array(
                        header['SegmentValue'])))
            print("### Multi Stream config ###")
            for seg in json_data['StreamProfileHandler']['EntityList']:
                for header in seg['StreamConfig']['HwModifiers']:
                    print(header)
    except KeyError as exc:
        print("Error setting not found in JSON data: {}".format(exc))


def read_json_file(json_file):
    """
    Read the json file path and return a dictionary of the data
    :param json_file: path to json file
    :return: dictionary of json data
    """
    try:
        with open(json_file, 'r', encoding=_LOCALE) as data_file:
            file_data = json.loads(data_file.read())
    except ValueError as exc:
        # general json exception, Python 3.5 adds new exception type
        _LOGGER.exception("Exception with json read: %s", exc)
        raise
    except IOError as exc:
        _LOGGER.exception(
            'Exception during file open: %s file=%s', exc, json_file)
        raise
    return file_data


def write_json_file(json_data, output_path):
    """
    Write out the dictionary of data to a json file
    :param json_data: dictionary of json data
    :param output_path: file path to write output
    :return: Boolean if success
    """
    try:
        with open(output_path, 'w', encoding=_LOCALE) as fileh:
            json.dump(json_data, fileh, indent=2, sort_keys=True,
                      ensure_ascii=True)
        return True
    except ValueError as exc:
        # general json exception, Python 3.5 adds new exception type
        _LOGGER.exception(
            "Exception with json write: %s", exc)
        return False
    except IOError as exc:
        _LOGGER.exception(
            'Exception during file write: %s file=%s', exc, output_path)
        return False


if __name__ == "__main__":
    print("Running UnitTest for XenaJSON")
    JSON = XenaJSON()
    print_json_report(JSON.json_data)
    JSON.set_chassis_info('192.168.0.5', 'vsperf')
    JSON.set_port(0, 1, 0)
    JSON.set_port(1, 1, 1)
    JSON.set_port_ip_v4(0, '192.168.240.10', 32, '192.168.240.1')
    JSON.set_port_ip_v4(1, '192.168.240.11', 32, '192.168.240.1')
    JSON.set_port_ip_v6(0, 'a1a1:a2a2:a3a3:a4a4:a5a5:a6a6:a7a7:a8a8', 128,
                        'a1a1:a2a2:a3a3:a4a4:a5a5:a6a6:a7a7:1111')
    JSON.set_port_ip_v6(1, 'b1b1:b2b2:b3b3:b4b4:b5b5:b6b6:b7b7:b8b8', 128,
                        'b1b1:b2b2:b3b3:b4b4:b5b5:b6b6:b7b7:1111')
    JSON.set_header_layer2(dst_mac='dd:dd:dd:dd:dd:dd',
                           src_mac='ee:ee:ee:ee:ee:ee')
    JSON.set_header_vlan(vlan_id=5)
    JSON.set_header_layer3(src_ip='192.168.100.2', dst_ip='192.168.100.3',
                           protocol='udp')
    JSON.set_header_layer4_udp(source_port=3000, destination_port=3001)
    JSON.set_test_options(packet_sizes=[64], duration=10, iterations=1,
                          loss_rate=0.0, micro_tpld=True)
    JSON.add_header_segments(flows=4000, multistream_layer='L4')
    JSON.set_topology_blocks()
    write_json_file(JSON.json_data, './testthis.x2544')
    JSON = XenaJSON('./testthis.x2544')
    print_json_report(JSON.json_data)