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# Copyright 2015-2016 Intel Corporation.
#
# 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.
"""Abstract "traffic generator" model.
This is an abstract class for traffic generators.
"""
import copy
from conf import settings
CMD_PREFIX = 'gencmd : '
class ITrafficGenerator(object):
"""Model of a traffic generator device.
"""
def __init__(self):
"""Initialization of interface
"""
self._default_traffic = copy.deepcopy(settings.getValue('TRAFFIC'))
@property
def traffic_defaults(self):
"""Default traffic values.
These can be expected to be constant across traffic generators,
so no setter is provided. Changes to the structure or contents
will likely break traffic generator implementations or tests
respectively.
"""
return self._default_traffic
def __enter__(self):
"""Connect to the traffic generator.
Provide a context manager interface to the traffic generators.
This simply calls the :func:`connect` function.
"""
return self.connect()
def __exit__(self, type_, value, traceback):
"""Disconnect from the traffic generator.
Provide a context manager interface to the traffic generators.
This simply calls the :func:`disconnect` function.
"""
self.disconnect()
def connect(self):
"""Connect to the traffic generator.
This is an optional function, designed for traffic generators
which must be "connected to" (i.e. via SSH or an API) before
they can be used. If not required, simply do nothing here.
Where implemented, this function should raise an exception on
failure.
:returns: None
"""
raise NotImplementedError('Please call an implementation.')
def disconnect(self):
"""Disconnect from the traffic generator.
As with :func:`connect`, this function is optional.
Where implemented, this function should raise an exception on
failure.
:returns: None
"""
raise NotImplementedError('Please call an implementation.')
def send_burst_traffic(self, traffic=None, duration=20):
"""Send a burst of traffic.
Send a ``traffic['burst_size']`` packets of traffic, using ``traffic``
configuration, for ``duration`` seconds.
Attributes:
:param traffic: Detailed "traffic" spec, see design docs for details
:param duration: Time to wait to receive packets
:returns: dictionary of strings with following data:
- List of Tx Frames,
- List of Rx Frames,
- List of Tx Bytes,
- List of List of Rx Bytes,
- Payload Errors and Sequence Errors.
"""
raise NotImplementedError('Please call an implementation.')
def send_cont_traffic(self, traffic=None, duration=20):
"""Send a continuous flow of traffic.
Send packets at given framerate, using ``traffic`` configuration,
for ``duration`` seconds..
:param traffic: Detailed "traffic" spec, see design docs for details
:param duration: Duration to transmit traffic.
:returns: dictionary of strings with following data:
- Tx Throughput (fps),
- Rx Throughput (fps),
- Tx Throughput (mbps),
- Rx Throughput (mbps),
- Tx Throughput (% linerate),
- Rx Throughput (% linerate),
- Min Latency (ns),
- Max Latency (ns),
- Avg Latency (ns)
"""
raise NotImplementedError('Please call an implementation.')
def start_cont_traffic(self, traffic=None, duration=30):
"""Non-blocking version of 'send_cont_traffic'.
Start transmission and immediately return. Do not wait for
results.
"""
raise NotImplementedError('Please call an implementation.')
def stop_cont_traffic(self):
"""Stop continuous transmission and return results.
"""
raise NotImplementedError('Please call an implementation.')
def send_rfc2544_throughput(self, traffic=None, tests=1, duration=20,
lossrate=0.0):
"""Send traffic per RFC2544 throughput test specifications.
Send packets at a variable rate, using ``traffic``
configuration, until minimum rate at which no packet loss is
detected is found.
:param traffic: Detailed "traffic" spec, see design docs for details
:param tests: Number of tests to execute
:param duration: Per iteration duration
:param lossrate: Acceptable lossrate percentage
:returns: dictionary of strings with following data:
- Tx Throughput (fps),
- Rx Throughput (fps),
- Tx Throughput (mbps),
- Rx Throughput (mbps),
- Tx Throughput (% linerate),
- Rx Throughput (% linerate),
- Min Latency (ns),
- Max Latency (ns),
- Avg Latency (ns)
"""
raise NotImplementedError('Please call an implementation.')
def start_rfc2544_throughput(self, traffic=None, tests=1, duration=20,
lossrate=0.0):
"""Non-blocking version of 'send_rfc2544_throughput'.
Start transmission and immediately return. Do not wait for
results.
"""
raise NotImplementedError('Please call an implementation.')
def wait_rfc2544_throughput(self):
"""Wait for and return results of RFC2544 test.
"""
raise NotImplementedError('Please call an implementation.')
def send_rfc2544_back2back(self, traffic=None, tests=1, duration=20,
lossrate=0.0):
"""Send traffic per RFC2544 back2back test specifications.
Send packets at a fixed rate, using ``traffic``
configuration, for duration seconds.
:param traffic: Detailed "traffic" spec, see design docs for details
:param tests: Number of tests to execute
:param duration: Per iteration duration
:param lossrate: Acceptable loss percentage
:returns: Named tuple of Rx Throughput (fps), Rx Throughput (mbps),
Tx Rate (% linerate), Rx Rate (% linerate), Tx Count (frames),
Back to Back Count (frames), Frame Loss (frames), Frame Loss (%)
:rtype: :class:`Back2BackResult`
"""
raise NotImplementedError('Please call an implementation.')
def start_rfc2544_back2back(self, traffic=None, tests=1, duration=20,
lossrate=0.0):
"""Non-blocking version of 'send_rfc2544_back2back'.
Start transmission and immediately return. Do not wait for
results.
"""
raise NotImplementedError('Please call an implementation.')
def wait_rfc2544_back2back(self):
"""Wait and set results of RFC2544 test.
"""
raise NotImplementedError('Please call an implementation.')
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