diff options
Diffstat (limited to 'resources/libraries/python/TrafficGenerator.py')
| -rw-r--r-- | resources/libraries/python/TrafficGenerator.py | 195 |
1 files changed, 122 insertions, 73 deletions
diff --git a/resources/libraries/python/TrafficGenerator.py b/resources/libraries/python/TrafficGenerator.py index 334e299f3e..57ff22424d 100644 --- a/resources/libraries/python/TrafficGenerator.py +++ b/resources/libraries/python/TrafficGenerator.py @@ -13,6 +13,8 @@ """Performance testing traffic generator library.""" +import time + from robot.api import logger from robot.libraries.BuiltIn import BuiltIn @@ -30,6 +32,31 @@ from .PLRsearch.PLRsearch import PLRsearch __all__ = ['TGDropRateSearchImpl', 'TrafficGenerator', 'OptimizedSearch'] +def check_subtype(node): + """Return supported subtype of given node, or raise an exception. + + Currently only one subtype is supported, + but we want our code to be ready for other ones. + + :param node: Topology node to check. Can be None. + :type node: dict or NoneType + :returns: Subtype detected. + :rtype: NodeSubTypeTG + :raises RuntimeError: If node is not supported, message explains how. + """ + if node.get('type') is None: + raise RuntimeError('Node type is not defined') + elif node['type'] != NodeType.TG: + raise RuntimeError('Node type is {typ!r}, not a TG'.format( + typ=node['type'])) + elif node.get('subtype') is None: + raise RuntimeError('TG subtype is not defined') + elif node['subtype'] == NodeSubTypeTG.TREX: + return NodeSubTypeTG.TREX + raise RuntimeError('TG subtype {sub!r} is not supported'.format( + sub=node['subtype'])) + + class TGDropRateSearchImpl(DropRateSearch): """Drop Rate Search implementation.""" @@ -62,34 +89,23 @@ class TGDropRateSearchImpl(DropRateSearch): # to be able to use trex_stl-*() tg_instance = BuiltIn().get_library_instance( 'resources.libraries.python.TrafficGenerator') - - if tg_instance.node['subtype'] is None: - raise RuntimeError('TG subtype not defined') - elif tg_instance.node['subtype'] == NodeSubTypeTG.TREX: + subtype = check_subtype(tg_instance.node) + if subtype == NodeSubTypeTG.TREX: unit_rate = str(rate) + self.get_rate_type_str() if skip_warmup: - tg_instance.trex_stl_start_remote_exec(self.get_duration(), - unit_rate, frame_size, - traffic_profile, - warmup_time=0.0) + tg_instance.trex_stl_start_remote_exec( + self.get_duration(), unit_rate, frame_size, traffic_profile, + warmup_time=0.0) else: - tg_instance.trex_stl_start_remote_exec(self.get_duration(), - unit_rate, frame_size, - traffic_profile) + tg_instance.trex_stl_start_remote_exec( + self.get_duration(), unit_rate, frame_size, traffic_profile) loss = tg_instance.get_loss() sent = tg_instance.get_sent() if self.loss_acceptance_type_is_percentage(): loss = (float(loss) / float(sent)) * 100 - - logger.trace("comparing: {} < {} {}".format(loss, - loss_acceptance, - loss_acceptance_type)) - if float(loss) > float(loss_acceptance): - return False - else: - return True - else: - raise NotImplementedError("TG subtype not supported") + logger.trace("comparing: {los} < {acc} {typ}".format( + los=loss, acc=loss_acceptance, typ=loss_acceptance_type)) + return float(loss) <= float(loss_acceptance) def get_latency(self): """Returns min/avg/max latency. @@ -114,15 +130,20 @@ class TrafficGenerator(AbstractMeasurer): ROBOT_LIBRARY_SCOPE = 'TEST SUITE' def __init__(self): + # TODO: Number of fields will be reduced with CSIT-1378. + self._node = None + # T-REX interface order mapping + self._ifaces_reordered = False + # Result holding fields, to be removed. self._result = None self._loss = None self._sent = None self._latency = None self._received = None - self._node = None - # T-REX interface order mapping - self._ifaces_reordered = False - # Parameters not given by measure(). + # Measurement input fields, needed for async stop result. + self._start_time = None + self._rate = None + # Other input parameters, not knowable from measure() signature. self.frame_size = None self.traffic_profile = None self.warmup_time = None @@ -199,11 +220,10 @@ class TrafficGenerator(AbstractMeasurer): :returns: nothing :raises RuntimeError: In case of issue during initialization. """ - if tg_node['type'] != NodeType.TG: - raise RuntimeError('Node type is not a TG') - self._node = tg_node + subtype = check_subtype(tg_node) + if subtype == NodeSubTypeTG.TREX: + self._node = tg_node - if self._node['subtype'] == NodeSubTypeTG.TREX: ssh = SSH() ssh.connect(self._node) @@ -293,9 +313,7 @@ class TrafficGenerator(AbstractMeasurer): :type osi_layer: str :raises RuntimeError: If node subtype is not a TREX or startup failed. """ - if self._node['subtype'] != NodeSubTypeTG.TREX: - raise RuntimeError('Node subtype is not a TREX!') - + # No need to check subtype, we know it is TREX. for _ in range(0, 3): # Kill TRex only if it is already running. cmd = "sh -c 'pgrep t-rex && pkill t-rex && sleep 3 || true'" @@ -357,8 +375,7 @@ class TrafficGenerator(AbstractMeasurer): :rtype: bool :raises RuntimeError: If node type is not a TG. """ - if node['type'] != NodeType.TG: - raise RuntimeError('Node type is not a TG') + # No need to check subtype, we know it is TREX. ssh = SSH() ssh.connect(node) @@ -375,9 +392,8 @@ class TrafficGenerator(AbstractMeasurer): :raises RuntimeError: If node type is not a TG, or if TRex teardown fails. """ - if node['type'] != NodeType.TG: - raise RuntimeError('Node type is not a TG') - if node['subtype'] == NodeSubTypeTG.TREX: + subtype = check_subtype(node) + if subtype == NodeSubTypeTG.TREX: ssh = SSH() ssh.connect(node) (ret, _, _) = ssh.exec_command( @@ -385,25 +401,49 @@ class TrafficGenerator(AbstractMeasurer): if int(ret) != 0: raise RuntimeError('pkill t-rex failed') - @staticmethod - def trex_stl_stop_remote_exec(node): + def _parse_traffic_results(self, stdout): + """Parse stdout of scripts into fieds of self. + + Block of code to reuse, by sync start, or stop after async. + TODO: Is the output TG subtype dependent? + + :param stdout: Text containing the standard output. + :type stdout: str + """ + # last line from console output + line = stdout.splitlines()[-1] + self._result = line + logger.info('TrafficGen result: {0}'.format(self._result)) + self._received = self._result.split(', ')[1].split('=')[1] + self._sent = self._result.split(', ')[2].split('=')[1] + self._loss = self._result.split(', ')[3].split('=')[1] + self._latency = [] + self._latency.append(self._result.split(', ')[4].split('=')[1]) + self._latency.append(self._result.split(', ')[5].split('=')[1]) + + def trex_stl_stop_remote_exec(self, node): """Execute script on remote node over ssh to stop running traffic. + Internal state is updated with results. + :param node: TRex generator node. :type node: dict :returns: Nothing :raises RuntimeError: If stop traffic script fails. """ + # No need to check subtype, we know it is TREX. ssh = SSH() ssh.connect(node) - (ret, _, _) = ssh.exec_command( + (ret, stdout, _) = ssh.exec_command( "sh -c '{}/resources/tools/trex/" "trex_stateless_stop.py'".format(Constants.REMOTE_FW_DIR)) if int(ret) != 0: raise RuntimeError('TRex stateless runtime error') + self._parse_traffic_results(stdout) + def trex_stl_start_remote_exec( self, duration, rate, frame_size, traffic_profile, async_call=False, latency=True, warmup_time=5.0, unidirection=False, tx_port=0, @@ -435,6 +475,7 @@ class TrafficGenerator(AbstractMeasurer): :type rx_port: int :raises RuntimeError: In case of TG driver issue. """ + # No need to check subtype, we know it is TREX. ssh = SSH() ssh.connect(self._node) reorder = self._ifaces_reordered # Just to make the next line fit. @@ -471,21 +512,16 @@ class TrafficGenerator(AbstractMeasurer): raise RuntimeError('TRex stateless runtime error') elif async_call: #no result + self._start_time = time.time() + self._rate = float(rate[:-3]) if "pps" in rate else rate self._received = None self._sent = None self._loss = None self._latency = None else: - # last line from console output - line = stdout.splitlines()[-1] - self._result = line - logger.info('TrafficGen result: {0}'.format(self._result)) - self._received = self._result.split(', ')[1].split('=')[1] - self._sent = self._result.split(', ')[2].split('=')[1] - self._loss = self._result.split(', ')[3].split('=')[1] - self._latency = [] - self._latency.append(self._result.split(', ')[4].split('=')[1]) - self._latency.append(self._result.split(', ')[5].split('=')[1]) + self._parse_traffic_results(stdout) + self._start_time = None + self._rate = None def stop_traffic_on_tg(self): """Stop all traffic on TG. @@ -493,9 +529,8 @@ class TrafficGenerator(AbstractMeasurer): :returns: Nothing :raises RuntimeError: If TG is not set. """ - if self._node is None: - raise RuntimeError("TG is not set") - if self._node['subtype'] == NodeSubTypeTG.TREX: + subtype = check_subtype(self._node) + if subtype == NodeSubTypeTG.TREX: self.trex_stl_stop_remote_exec(self._node) def send_traffic_on_tg( @@ -547,22 +582,11 @@ class TrafficGenerator(AbstractMeasurer): or if subtype is not specified. :raises NotImplementedError: If TG is not supported. """ - - node = self._node - if node is None: - raise RuntimeError("TG is not set") - - if node['type'] != NodeType.TG: - raise RuntimeError('Node type is not a TG') - - if node['subtype'] is None: - raise RuntimeError('TG subtype not defined') - elif node['subtype'] == NodeSubTypeTG.TREX: + subtype = check_subtype(self._node) + if subtype == NodeSubTypeTG.TREX: self.trex_stl_start_remote_exec( duration, rate, frame_size, traffic_profile, async_call, latency, warmup_time, unidirection, tx_port, rx_port) - else: - raise NotImplementedError("TG subtype not supported") return self._result @@ -629,6 +653,36 @@ class TrafficGenerator(AbstractMeasurer): self.traffic_profile = str(traffic_profile) self.warmup_time = float(warmup_time) + def get_measurement_result(self, duration=None, transmit_rate=None): + """Return the result of last measurement as ReceiveRateMeasurement. + + Separate function, as measurements can end either by time + or by explicit call, this is the common block at the end. + + TODO: Fail on running or already reported measurement. + + :param duration: Measurement duration [s] if known beforehand. + For explicitly stopped measurement it is estimated. + :param transmit_rate: Target aggregate transmit rate [pps]. + If not given, computed assuming it was bidirectional. + :type duration: float or NoneType + :type transmit_rate: float or NoneType + :returns: Structure containing the result of the measurement. + :rtype: ReceiveRateMeasurement + """ + if duration is None: + duration = time.time() - self._start_time + self._start_time = None + if transmit_rate is None: + # Assuming bi-directional traffic here. + transmit_rate = self._rate * 2.0 + transmit_count = int(self.get_sent()) + loss_count = int(self.get_loss()) + measurement = ReceiveRateMeasurement( + duration, transmit_rate, transmit_count, loss_count) + measurement.latency = self.get_latency_int() + return measurement + def measure(self, duration, transmit_rate): """Run bi-directional measurement, parse and return results. @@ -644,17 +698,12 @@ class TrafficGenerator(AbstractMeasurer): """ duration = float(duration) transmit_rate = float(transmit_rate) - # Trex needs target Tr per stream, but reports aggregate Tx and Dx. + # TG needs target Tr per stream, but reports aggregate Tx and Dx. unit_rate = str(transmit_rate / 2.0) + "pps" self.send_traffic_on_tg( duration, unit_rate, self.frame_size, self.traffic_profile, warmup_time=self.warmup_time, latency=True) - transmit_count = int(self.get_sent()) - loss_count = int(self.get_loss()) - measurement = ReceiveRateMeasurement( - duration, transmit_rate, transmit_count, loss_count) - measurement.latency = self.get_latency_int() - return measurement + return self.get_measurement_result(duration, transmit_rate) class OptimizedSearch(object): |