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# Copyright (c) 2024 Cisco and/or its affiliates.
#
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
# Licensed under the Apache License 2.0 or
# GNU General Public License v2.0 or later; you may not use this file
# except in compliance with one of these Licenses. You
# may obtain a copy of the Licenses at:
#
# http://www.apache.org/licenses/LICENSE-2.0
# https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
#
# Note: If this file is linked with Scapy, which is GPLv2+, your use of it
# must be under GPLv2+. If at any point in the future it is no longer linked
# with Scapy (or other GPLv2+ licensed software), you are free to choose
# Apache 2.
#
# 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.
"""Base class for stream profiles for T-rex traffic generator.
"""
import json
import os
from trex.stl.api import *
CP = os.path.join(os.path.abspath(os.sep), "etc")
class TrafficStreamsJsonClass:
"""Base class for stream profiles for T-rex traffic generator."""
def __init__(self):
# Default value of frame size, it will be overwritten by the value of
# "framesize" parameter of "get_streams" method.
self.framesize = 64
def define_packets(self):
"""Define the packets to be sent from the traffic generator.
This method MUST return:
return pkt, vm
:returns: Packets to be sent from the traffic generator.
:rtype: tuple
"""
raise NotImplementedError
def create_streams(self):
"""Create traffic streams.
Implement your own traffic streams.
:returns: Traffic streams.
:rtype: list
"""
pkt_streams = []
lat_streams = []
with open(os.path.join(CP, "packet-profile.json")) as packets_json:
packets_data = json.load(packets_json)
for profile in packets_data["profiles"]:
for i, stream in enumerate(profile["streams"]):
self.stream_data = stream
pkt, vm = self.define_packets()
packet = STLPktBuilder(pkt=pkt, vm=vm)
pkt_streams.append(
STLStream(
packet=packet,
mode=STLTXCont(pps=9000)
)
)
lat_streams.append(
STLStream(
packet=packet,
flow_stats=STLFlowLatencyStats(pg_id=i),
mode=STLTXCont(pps=9000)
)
)
streams = []
streams.extend(pkt_streams)
streams.extend(lat_streams)
return streams
def get_streams(self, **kwargs):
"""Get traffic streams created by "create_streams" method.
If needed, add your own parameters.
:param kwargs: Key-value pairs used by "create_streams" method while
creating streams.
:returns: Traffic streams.
:rtype: list
"""
self.framesize = kwargs["framesize"]
self.rate = kwargs["rate"]
return self.create_streams()
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