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send_stream.py
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#!/usr/bin/env python
import sys
import time
import argparse
from scapy.all import bind_layers
from scapy.all import Ether
from scapy.all import sendp
import time
from scapy.all import Packet, XStrFixedLenField, StrFixedLenField, XByteField, IntField
import numpy as np
parser = argparse.ArgumentParser(description='send stream')
parser.add_argument('--npackets',dest="npackets", help='n_packets td send',
type=int, action="store", required=True)
parser.add_argument('--payload', dest="payload", help='payload size',
action="store", required=True)
parser.add_argument('--iface', dest="iface", help='Interface name',
type=str, action="store", default="h1-eth0")
parser.add_argument('--rate', dest="rate", action="store", type=float, default=0.0, help="send rate in Mbits per sec")
parser.add_argument('--type', dest="type", help='experiment type', action="store", default="diversity", required=False)
args = parser.parse_args()
num_pkts = int(args.npackets)
payload_size = int(args.payload)
class CodingHdrS(Packet):
global payload_size
fields_desc = [
XByteField("num_switch_stats", 0x01),
StrFixedLenField("P", "P", length=1),
StrFixedLenField("Four", "4", length=1),
XByteField("version", 0x01),
XByteField("stream_id", 0x01),
XByteField("packet_todo", 0x01),
StrFixedLenField("packet_contents", ' ', length=1),
IntField("coded_packets_batch_num", 0),
StrFixedLenField("packet_payload", ' '*(payload_size/8), length=payload_size/8)]
bind_layers(Ether, CodingHdrS, type=0x1234)
def main():
global payload_size, args, num_pkts
if payload_size <= 0 :
payload_size = 1
time.sleep(2)
n_bits = 2*payload_size
if args.rate == 0.0 :
avg_time_to_sleep = 0.0
else:
rate = float(args.rate)*1000000.0
time_to_sleep = float(n_bits)/float(rate)
avg_time_to_sleep = float(payload_size)/float(rate)
print "Time to sleep (secs) = ", time_to_sleep
payload_A = "A"*(payload_size/8)
payload_B = "B"*(payload_size/8)
pktAd = Ether(type=0x1234) / CodingHdrS(num_switch_stats=0, packet_contents='A', packet_payload=payload_A)
pktAd = pktAd/' '
pktBd = Ether(type=0x1234) / CodingHdrS(num_switch_stats=0, packet_contents='B', packet_payload=payload_B)
pktBd = pktBd/' '
curr_send_rate = float(args.rate)
for i in range(num_pkts/2):
if i == 0:
curr_time = str(time.time())
first_pkt_time = float(curr_time)
n_chars = (payload_size/8)
payload_A = "A"
payload_B = "B"
n_chars_left = n_chars - 1 - len(curr_time)
payload_A = payload_A + ("0"* n_chars_left)
payload_B = payload_B + ("0"* n_chars_left)
payload_A = payload_A + curr_time
payload_B = payload_B + curr_time
pktA = Ether(type=0x1234) / CodingHdrS(num_switch_stats=0, packet_contents='A', packet_payload=payload_A)
pktA = pktA/' '
pktB = Ether(type=0x1234) / CodingHdrS(num_switch_stats=0, packet_contents='B', packet_payload=payload_B)
pktB = pktB/' '
start_time = float(curr_time)
sendp(pktA, iface=args.iface)
end_time = float(time.time())
elapsed = end_time - start_time
time_to_sleep = np.random.exponential(scale=avg_time_to_sleep)
if time_to_sleep - elapsed > 0 :
time.sleep(time_to_sleep - elapsed)
start_time = float(time.time())
sendp(pktB, iface=args.iface)
end_time = float(time.time())
elapsed = end_time - start_time
time_to_sleep = np.random.exponential(scale=avg_time_to_sleep)
if time_to_sleep - elapsed > 0 :
time.sleep(time_to_sleep - elapsed)
elif i == num_pkts/2 - 1:
curr_send_rate_str = str(curr_send_rate)
payload_A = "A"
payload_B = "B"
n_chars_left = n_chars - 1 - len(curr_send_rate_str)
payload_A = payload_A + ("0"* n_chars_left)
payload_B = payload_B + ("0"* n_chars_left)
payload_A = payload_A + curr_send_rate_str
payload_B = payload_B + curr_send_rate_str
pktA = Ether(type=0x1234) / CodingHdrS(num_switch_stats=0, packet_contents='A', packet_payload=payload_A)
pktA = pktA/' '
pktB = Ether(type=0x1234) / CodingHdrS(num_switch_stats=0, packet_contents='B', packet_payload=payload_B)
pktB = pktB/' '
start_time = float(time.time())
sendp(pktA, iface=args.iface)
end_time = float(time.time())
elapsed = end_time - start_time
time_to_sleep = np.random.exponential(scale=avg_time_to_sleep)
if time_to_sleep - elapsed > 0 :
time.sleep(time_to_sleep - elapsed)
start_time = float(time.time())
sendp(pktB, iface=args.iface)
end_time = float(time.time())
elapsed = end_time - start_time
last_pkt_time = float(end_time)
time_to_sleep = np.random.exponential(scale=avg_time_to_sleep)
if time_to_sleep - elapsed > 0 :
time.sleep(time_to_sleep - elapsed)
else:
start_time = float(time.time())
sendp(pktA, iface=args.iface)
end_time = float(time.time())
elapsed = end_time - start_time
time_to_sleep = np.random.exponential(scale=avg_time_to_sleep)
if time_to_sleep - elapsed > 0 :
time.sleep(time_to_sleep - elapsed)
start_time = float(time.time())
sendp(pktB, iface=args.iface)
end_time = float(time.time())
elapsed = end_time - start_time
last_pkt_time = float(end_time)
time_to_sleep = np.random.exponential(scale=avg_time_to_sleep)
if time_to_sleep - elapsed > 0 :
time.sleep(time_to_sleep - elapsed)
curr_send_rate = float(payload_size*2*(i+1))/float((last_pkt_time - first_pkt_time)*10**6)
print "Pkt batch send time: ", time.time()
#if(time_to_sleep > 0.0) :
# if time_to_sleep - elapsed > 0.0 :
# time.sleep(float(time_to_sleep) - elapsed)
print "Send Rate (Mbits per sec): ", curr_send_rate
if __name__ == '__main__':
main()