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#!/usr/bin/python
# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""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 -c 4)
- trex_stl_lib.api library
- Script must be executed on a node with T-REX instance
Functionality:
1. Stop any running traffic
"""
import sys
import json
sys.path.insert(0, "/opt/trex-core-2.34/scripts/automation/"+\
"trex_control_plane/stl/")
from trex_stl_lib.api import *
def stop_all_traffic_streams():
"""Stop traffic if any is running.
:return: nothing
"""
# create client
client = STLClient(verbose_level=LoggerApi.VERBOSE_QUIET)
try:
# connect to server
client.connect()
client.acquire(force=True)
client.stop(ports=[0, 1])
# read the stats after the test
stats = client.get_stats()
print("#####statistics (approx.)#####")
print(json.dumps(stats, indent=4,
separators=(',', ': '), sort_keys=True))
lost_a = stats[0]["opackets"] - stats[1]["ipackets"]
lost_b = stats[1]["opackets"] - stats[0]["ipackets"]
print("\npackets lost from 0 --> 1: {0} pkts".format(lost_a))
print("packets lost from 1 --> 0: {0} pkts".format(lost_b))
except STLError as ex_error:
print_error(str(ex_error))
sys.exit(1)
finally:
client.disconnect()
def print_error(msg):
"""Print error message on stderr.
:param msg: Error message to print.
:type msg: string
:return: nothing
"""
sys.stderr.write(msg+'\n')
def main():
"""Main function."""
stop_all_traffic_streams()
if __name__ == "__main__":
main()
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