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#!/usr/bin/python3
# Copyright (c) 2020 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.
"""This script uses T-REX stateless API to drive t-rex instance.
Requirements:
- T-REX: https://github.com/cisco-system-traffic-generator/trex-core
- compiled and running T-REX process (eg. ./t-rex-64 -i)
- trex.stl.api library
- Script must be executed on a node with T-REX instance
Functionality:
1. Stop any running traffic
2. Optionally restore reference counter values.
3. Return conter differences.
"""
import argparse
import json
import sys
from collections import OrderedDict # Needed to parse xstats representation.
sys.path.insert(
0, u"/opt/trex-core-2.82/scripts/automation/trex_control_plane/interactive/"
)
from trex.stl.api import *
def main():
"""Stop traffic if any is running. Report xstats."""
parser = argparse.ArgumentParser()
parser.add_argument(
u"--xstat0", type=str, default=u"",
help=u"Reference xstat object if any."
)
parser.add_argument(
u"--xstat1", type=str, default=u"",
help=u"Reference xstat object if any."
)
args = parser.parse_args()
client = STLClient()
try:
# connect to server
client.connect()
client.acquire(force=True)
# TODO: Support unidirection.
client.stop(ports=[0, 1])
# Read the stats after the test,
# we need to update values before the last trial started.
if args.xstat0:
snapshot = eval(args.xstat0)
client.ports[0].get_xstats().reference_stats = snapshot
if args.xstat1:
snapshot = eval(args.xstat1)
client.ports[1].get_xstats().reference_stats = snapshot
# Now we can call the official method to get differences.
xstats0 = client.get_xstats(0)
xstats1 = client.get_xstats(1)
# If STLError happens, let the script fail with stack trace.
finally:
client.disconnect()
print(u"##### statistics port 0 #####")
print(json.dumps(xstats0, indent=4, separators=(u",", u": ")))
print(u"##### statistics port 1 #####")
print(json.dumps(xstats1, indent=4, separators=(u",", u": ")))
tx_0, rx_0 = xstats0[u"tx_good_packets"], xstats0[u"rx_good_packets"]
tx_1, rx_1 = xstats1[u"tx_good_packets"], xstats1[u"rx_good_packets"]
lost_a, lost_b = tx_0 - rx_1, tx_1 - rx_0
print(f"\npackets lost from 0 --> 1: {lost_a} pkts")
print(f"packets lost from 1 --> 0: {lost_b} pkts")
total_rcvd, total_sent = rx_0 + rx_1, tx_0 + tx_1
total_lost = total_sent - total_rcvd
print(
f"rate='unknown'; "
f"total_received={total_rcvd}; "
f"total_sent={total_sent}; "
f"frame_loss={total_lost}; "
f"target_duration='manual'; "
f"approximated_duration='manual'; "
f"approximated_rate='unknown'; "
f"latency_stream_0(usec)=-1/-1/-1; "
f"latency_stream_1(usec)=-1/-1/-1; "
)
if __name__ == u"__main__":
main()
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