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#!/usr/bin/python

##
## Copyright (c) 2020 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.
##

import sys
import time
from math import ceil
from statistics import mean
from past.utils import old_div
from rapid_log import RapidLog
from rapid_log import bcolors
from rapid_test import RapidTest
inf = float("inf")

class FlowSizeTest(RapidTest):
    """
    Class to manage the flowsizetesting
    """
    def __init__(self, test_param, lat_percentile, runtime, pushgateway,
            environment_file, gen_machine, sut_machine, background_machines):
        self.test = test_param
        self.gen_machine = gen_machine
        self.sut_machine = sut_machine
        self.background_machines = background_machines
        self.test['lat_percentile'] = lat_percentile
        self.test['runtime'] = runtime
        self.test['pushgateway'] = pushgateway
        self.test['environment_file'] = environment_file
        if 'maxr' not in self.test.keys():
            self.test['maxr'] = 1
        if 'maxz' not in self.test.keys():
            self.test['maxz'] = inf
        if self.test['test'] == 'TST009test':
            # This test implements some of the testing as defined in https://docbox.etsi.org/ISG/NFV/open/Publications_pdf/Specs-Reports/NFV-TST%20009v3.2.1%20-%20GS%20-%20NFVI_Benchmarks.pdf
            self.test['TST009_n'] = int(ceil(old_div(self.test['maxframespersecondallingress'], self.test['stepsize'])))
            self.test['TST009'] = True
            self.test['TST009_L'] = 0
            self.test['TST009_R'] = self.test['TST009_n'] - 1
            self.test['TST009_S']= []
            for m in range(0, self.test['TST009_n']):
                self.test['TST009_S'].append((m+1) * self.test['stepsize'])
            self.test['lat_avg_threshold'] = inf
            self.test['lat_perc_threshold'] = inf
            self.test['lat_max_threshold'] = inf
        elif self.test['test'] == 'fixed_rate':
            for key in['drop_rate_threshold','lat_avg_threshold','lat_perc_threshold','lat_max_threshold']:
                self.test[key] = inf

    def new_speed(self, speed,size,success):
        if self.test['test'] == 'fixed_rate':
            return (self.test['startspeed'])
        elif 'TST009' in self.test.keys():
            if success:
                self.test['TST009_L'] = self.test['TST009_m'] + 1
            else:
                self.test['TST009_R'] = max(self.test['TST009_m'] - 1, self.test['TST009_L'])
            self.test['TST009_m'] = int (old_div((self.test['TST009_L'] + self.test['TST009_R']),2))
            return (self.get_percentageof10Gbps(self.test['TST009_S'][self.test['TST009_m']],size))
        else:
            if success:
                self.test['minspeed'] = speed
            else:
                self.test['maxspeed'] = speed
            return (old_div((self.test['minspeed'] + self.test['maxspeed']),2.0))

    def get_start_speed_and_init(self, size):
        if self.test['test'] == 'fixed_rate':
            return (self.test['startspeed'])
        elif 'TST009' in self.test.keys():
            self.test['TST009_L'] = 0
            self.test['TST009_R'] = self.test['TST009_n'] - 1
            self.test['TST009_m'] = int(old_div((self.test['TST009_L'] + self.test['TST009_R']), 2))
            return (self.get_percentageof10Gbps(self.test['TST009_S'][self.test['TST009_m']],size))
        else:
            self.test['minspeed'] = 0
            self.test['maxspeed'] = self.test['startspeed'] 
            return (self.test['startspeed'])

    def resolution_achieved(self):
        if self.test['test'] == 'fixed_rate':
            return (True)
        elif 'TST009' in self.test.keys():
            return (self.test['TST009_L'] == self.test['TST009_R'])
        else:
            return ((self.test['maxspeed'] - self.test['minspeed']) <= self.test['accuracy'])

    def run(self):
    #    global fieldnames
    #    global writer
    #    #fieldnames = ['Flows','PacketSize','Gbps','Mpps','AvgLatency','MaxLatency','PacketsDropped','PacketDropRate']
    #    fieldnames = ['Flows','PacketSize','RequestedPPS','GeneratedPPS','SentPPS','ForwardedPPS','ReceivedPPS','AvgLatencyUSEC','MaxLatencyUSEC','Sent','Received','Lost','LostTotal']
    #    writer = csv.DictWriter(data_csv_file, fieldnames=fieldnames)
    #    writer.writeheader()
        self.gen_machine.start_latency_cores()
        TestPassed = True
        for imix in self.test['imixs']:
            size = mean(imix)
            self.gen_machine.set_udp_packet_size(imix)
            if self.background_machines:
                backgroundinfo = '{}Running {} x background traffic not represented in the table{}'.format(bcolors.FLASH,len(self.background_machines),bcolors.ENDC)
            else:
                backgroundinfo = '{}{}'.format(bcolors.FLASH,bcolors.ENDC)
            self.set_background_size(self.background_machines, imix)
            RapidLog.info("+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+")
            RapidLog.info('| UDP, {:>5} bytes, different number of flows by randomizing SRC & DST UDP port. {:116.116}|'.format(size, backgroundinfo))
            RapidLog.info("+--------+------------------+-------------+-------------+-------------+------------------------+----------+----------+----------+-----------+-----------+-----------+-----------+-------+----+")
            RapidLog.info('| Flows  | Speed requested  | Gen by core | Sent by NIC | Fwrd by SUT | Rec. by core           | Avg. Lat.|{:.0f} Pcentil| Max. Lat.|   Sent    |  Received |    Lost   | Total Lost|L.Ratio|Time|'.format(self.test['lat_percentile']*100))
            RapidLog.info("+--------+------------------+-------------+-------------+-------------+------------------------+----------+----------+----------+-----------+-----------+-----------+-----------+-------+----+")
            for flow_number in self.test['flows']:
                attempts = 0
                self.gen_machine.reset_stats()
                if self.sut_machine:
                    self.sut_machine.reset_stats()
                flow_number = self.gen_machine.set_flows(flow_number)
                self.set_background_flows(self.background_machines, flow_number)
                endspeed = None
                speed = self.get_start_speed_and_init(size)
                while True:
                    attempts += 1
                    endwarning = False
                    print(str(flow_number)+' flows: Measurement ongoing at speed: ' + str(round(speed,2)) + '%      ',end='\r')
                    sys.stdout.flush()
                    # Start generating packets at requested speed (in % of a 10Gb/s link)
                    self.gen_machine.set_generator_speed(speed)
                    self.set_background_speed(self.background_machines, speed)
                    self.start_background_traffic(self.background_machines)
                    # Get statistics now that the generation is stable and initial ARP messages are dealt with
                    pps_req_tx,pps_tx,pps_sut_tx,pps_rx,lat_avg,lat_perc , lat_perc_max, lat_max, abs_tx,abs_rx,abs_dropped, abs_tx_fail, drop_rate, lat_min, lat_used, r, actual_duration = self.run_iteration(float(self.test['runtime']),flow_number,size,speed)
                    self.stop_background_traffic(self.background_machines)
                    if r > 1:
                        retry_warning = bcolors.WARNING + ' {:1} retries needed'.format(r) +  bcolors.ENDC
                    else:
                        retry_warning = ''
                    # Drop rate is expressed in percentage. lat_used is a ratio (0 to 1). The sum of these 2 should be 100%.
                    # If the sum is lower than 95, it means that more than 5% of the latency measurements where dropped for accuracy reasons.
                    if (drop_rate + lat_used * 100) < 95:
                        lat_warning = bcolors.WARNING + ' Latency accuracy issue?: {:>3.0f}%'.format(lat_used*100) +  bcolors.ENDC
                    else:
                        lat_warning = ''
                    if self.test['test'] == 'fixed_rate':
                        endspeed = speed
                        endpps_req_tx = None
                        endpps_tx = None
                        endpps_sut_tx = None
                        endpps_rx = None
                        endlat_avg = lat_avg
                        endlat_perc = lat_perc
                        endlat_perc_max = lat_perc_max
                        endlat_max = lat_max
                        endabs_dropped = abs_dropped
                        enddrop_rate = drop_rate
                        endabs_tx = abs_tx
                        endabs_rx = abs_rx
                        if lat_warning or retry_warning:
                            endwarning = '|        | {:177.177} |'.format(retry_warning + lat_warning)
                        success = True
                        TestPassed = False # fixed rate testing cannot be True, it is just reported numbers every second
                        speed_prefix = lat_avg_prefix = lat_perc_prefix = lat_max_prefix = abs_drop_rate_prefix = drop_rate_prefix = bcolors.ENDC
                    # The following if statement is testing if we pass the success criteria of a certain drop rate, average latency and maximum latency below the threshold
                    # The drop rate success can be achieved in 2 ways: either the drop rate is below a treshold, either we want that no packet has been lost during the test
                    # This can be specified by putting 0 in the .test file
                    elif ((drop_rate < self.test['drop_rate_threshold']) or (abs_dropped==self.test['drop_rate_threshold']==0)) and (lat_avg< self.test['lat_avg_threshold']) and (lat_perc< self.test['lat_perc_threshold']) and (lat_max < self.test['lat_max_threshold']):
                        if (old_div((self.get_pps(speed,size) - pps_tx),self.get_pps(speed,size)))>0.01:
                            speed_prefix = bcolors.WARNING
                            if abs_tx_fail > 0:
                                gen_warning = bcolors.WARNING + ' Network limit?: requesting {:<.3f} Mpps and getting {:<.3f} Mpps - {} failed to be transmitted'.format(self.get_pps(speed,size), pps_tx, abs_tx_fail) + bcolors.ENDC
                            else:
                                gen_warning = bcolors.WARNING + ' Generator limit?: requesting {:<.3f} Mpps and getting {:<.3f} Mpps'.format(self.get_pps(speed,size), pps_tx) + bcolors.ENDC
                        else:
                            speed_prefix = bcolors.ENDC
                            gen_warning = ''
                        endspeed = speed
                        endspeed_prefix = speed_prefix
                        endpps_req_tx = pps_req_tx
                        endpps_tx = pps_tx
                        endpps_sut_tx = pps_sut_tx
                        endpps_rx = pps_rx
                        endlat_avg = lat_avg
                        endlat_perc = lat_perc
                        endlat_perc_max = lat_perc_max
                        endlat_max = lat_max
                        endabs_dropped = None
                        enddrop_rate = drop_rate
                        endabs_tx = abs_tx
                        endabs_rx = abs_rx
                        if lat_warning or gen_warning or retry_warning:
                            endwarning = '|        | {:186.186} |'.format(retry_warning + lat_warning + gen_warning)
                        success = True
                        success_message=' SUCCESS'
                        speed_prefix = lat_avg_prefix = lat_perc_prefix = lat_max_prefix = abs_drop_rate_prefix = drop_rate_prefix = bcolors.ENDC
                        RapidLog.debug(self.report_result(-attempts,size,speed,pps_req_tx,pps_tx,pps_sut_tx,pps_rx,lat_avg,lat_perc,lat_perc_max,lat_max,abs_tx,abs_rx,abs_dropped,actual_duration,speed_prefix,lat_avg_prefix,lat_max_prefix,abs_drop_rate_prefix,drop_rate_prefix)+ success_message + retry_warning + lat_warning + gen_warning)
                    else:
                        success_message=' FAILED'
                        abs_drop_rate_prefix = bcolors.ENDC
                        if ((abs_dropped>0) and (self.test['drop_rate_threshold'] ==0)):
                            abs_drop_rate_prefix = bcolors.FAIL
                        if (drop_rate < self.test['drop_rate_threshold']):
                            drop_rate_prefix = bcolors.ENDC
                        else:
                            drop_rate_prefix = bcolors.FAIL
                        if (lat_avg< self.test['lat_avg_threshold']):
                            lat_avg_prefix = bcolors.ENDC
                        else:
                            lat_avg_prefix = bcolors.FAIL
                        if (lat_perc< self.test['lat_perc_threshold']):
                            lat_perc_prefix = bcolors.ENDC
                        else:
                            lat_perc_prefix = bcolors.FAIL
                        if (lat_max< self.test['lat_max_threshold']):
                            lat_max_prefix = bcolors.ENDC
                        else:
                            lat_max_prefix = bcolors.FAIL
                        if ((old_div((self.get_pps(speed,size) - pps_tx),self.get_pps(speed,size)))<0.001):
                            speed_prefix = bcolors.ENDC
                        else:
                            speed_prefix = bcolors.FAIL
                        success = False 
                        RapidLog.debug(self.report_result(-attempts,size,speed,pps_req_tx,pps_tx,pps_sut_tx,pps_rx,lat_avg,lat_perc,lat_perc_max,lat_max,abs_tx,abs_rx,abs_dropped,actual_duration,speed_prefix,lat_avg_prefix,lat_perc_prefix,lat_max_prefix,abs_drop_rate_prefix,drop_rate_prefix)+ success_message + retry_warning + lat_warning)
                    speed = self.new_speed(speed, size, success)
                    if self.resolution_achieved():
                        break
                if endspeed is not None:
                    if TestPassed and (endpps_rx < self.test['pass_threshold']):
                        TestPassed = False
                    speed_prefix = lat_avg_prefix = lat_perc_prefix = lat_max_prefix = abs_drop_rate_prefix = drop_rate_prefix = bcolors.ENDC
                    RapidLog.info(self.report_result(flow_number,size,endspeed,endpps_req_tx,endpps_tx,endpps_sut_tx,endpps_rx,endlat_avg,endlat_perc,endlat_perc_max,endlat_max,endabs_tx,endabs_rx,endabs_dropped,actual_duration,speed_prefix,lat_avg_prefix,lat_perc_prefix,lat_max_prefix,abs_drop_rate_prefix,drop_rate_prefix))
                    if endwarning:
                        RapidLog.info (endwarning)
                    RapidLog.info("+--------+------------------+-------------+-------------+-------------+------------------------+----------+----------+----------+-----------+-----------+-----------+-----------+-------+----+")
    #                writer.writerow({'Flows':flow_number,'PacketSize':(size+4),'RequestedPPS':self.get_pps(endspeed,size),'GeneratedPPS':endpps_req_tx,'SentPPS':endpps_tx,'ForwardedPPS':endpps_sut_tx,'ReceivedPPS':endpps_rx,'AvgLatencyUSEC':endlat_avg,'MaxLatencyUSEC':endlat_max,'Sent':endabs_tx,'Received':endabs_rx,'Lost':endabs_dropped,'LostTotal':endabs_dropped})
                    if self.test['pushgateway']:
                        URL = self.test['pushgateway'] + '/metrics/job/' + self.test['test']+ '/instance/' + self.test['environment_file']
                        if endabs_dropped == None:
                            ead = 0
                        else:
                            ead = endabs_dropped
                        DATA = 'Flows {}\nPacketSize {}\nRequestedPPS {}\nGeneratedPPS {}\nSentPPS {}\nForwardedPPS {}\nReceivedPPS {}\nAvgLatencyUSEC {}\nMaxLatencyUSEC {}\nSent {}\nReceived {}\nLost {}\nLostTotal {}\n'.format(flow_number,size+4,self.get_pps(endspeed,size),endpps_req_tx,endpps_tx,endpps_sut_tx,endpps_rx,endlat_avg,endlat_max,endabs_tx,endabs_rx,ead,ead)
                        HEADERS = {'X-Requested-With': 'Python requests', 'Content-type': 'text/xml'}
                        response = requests.post(url=URL, data=DATA,headers=HEADERS)
                        if (response.status_code != 202) and (response.status_code != 200):
                            RapidLog.info('Cannot send metrics to {}'.format(URL))
                            RapidLog.info(DATA)
                else:
                    RapidLog.info('|{:>7}'.format(str(flow_number))+" | Speed 0 or close to 0")
        self.gen_machine.stop_latency_cores()
        return (TestPassed)