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# 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.
"""Base class for profiles for T-rex advanced stateful (astf) traffic generator.
"""
from random import choices
from string import ascii_letters
from trex.astf.api import *
class TrafficProfileBaseClass:
"""Base class for profiles for T-rex astf traffic generator."""
STREAM_TABLE = {
u"IMIX_v4": [
{u"size": 60, u"pps": 28, u"isg": 0},
{u"size": 590, u"pps": 20, u"isg": 0.1},
{u"size": 1514, u"pps": 4, u"isg": 0.2}
],
'IMIX_v4_1': [
{u"size": 64, u"pps": 28, u"isg": 0},
{u"size": 570, u"pps": 16, u"isg": 0.1},
{u"size": 1518, u"pps": 4, u"isg": 0.2}
]
}
def __init__(self):
# Default values of required parameters; can be overwritten in
# "get_profile" method.
self.framesize = 64
self._pcap_dir = u""
# If needed, add your own parameters.
@property
def pcap_dir(self):
"""Pcap file directory.
If needed, implement your own algorithm.
:returns: Pcap file directory.
:rtype: str
"""
return self._pcap_dir
def _gen_padding(self, current_length, required_length=0):
"""Generate padding.
If needed, implement your own algorithm.
:param current_length: Current length of the packet.
:param required_length: Required length of the packet. If set to 0 then
self.framesize value is used.
:type current_length: int
:type required_length: int
:returns: The generated padding.
:rtype: str
"""
# TODO: Add support for IMIX frame size;
# use random.randrange(0, len(self.STREAM_TABLE[self.framesize])) ?
if not required_length:
required_length = self.framesize
return str(choices(ascii_letters, k=required_length - current_length))
def define_profile(self):
"""Define profile to be used by T-Rex astf traffic generator.
This method MUST return:
return ip_gen, templates, cap_list
templates or cap_list CAN be None.
:returns: IP generator and profile templates or list of pcap files for
traffic generator.
:rtype: tuple
"""
raise NotImplementedError
def create_profile(self):
"""Create traffic profile.
Implement your own traffic profiles.
:returns: Traffic profile.
:rtype: trex.astf.trex_astf_profile.ASTFProfile
"""
ip_gen, templates, cap_list = self.define_profile()
# In most cases you will not have to change the code below:
# profile
profile = ASTFProfile(
default_ip_gen=ip_gen,
templates=templates,
cap_list=cap_list
)
return profile
def get_profile(self, **kwargs):
"""Get traffic profile created by "create_profile" method.
If needed, add your own parameters.
:param kwargs: Key-value pairs used by "create_profile" method while
creating the profile.
:returns: Traffic profile.
:rtype: trex.astf.trex_astf_profile.ASTFProfile
"""
self.framesize = kwargs[u"framesize"]
self._pcap_dir = kwargs.get(
u"pcap_dir",u"/opt/trex-core-2.73/scripts/avl"
)
return self.create_profile()
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