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buckets.py
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buckets.py
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#! /usr/bin/env python
"""
A python script that simulates the token bucket and leaky bucket algorithms for
flow control in computer networks.
"""
from __future__ import print_function
import sys
import argparse
import time
ACCEPTED = 'ACCEPTED'
REJECTED = 'REJECTED'
SENT = 'SENT'
class bcolors:
OKGREEN = '\033[92m'
OKBLUE = '\033[94m'
WARNING = '\033[93m'
FAIL = '\033[91m'
ENDC = '\033[0m'
BOLD = '\033[1m'
UNDERLINE = '\033[4m'
def leaky_bucket(r, size, packet_size, time_lapse, packet_dates):
bucket = 0
leak = 0
sent_data = []
queue = 0
sent_packets = 0
r = r / 1000.0 # Converting r to milliseconds
for i in xrange(0, time_lapse + 1):
flag = 0
if i in packet_dates:
queue += 1
bucket += packet_size
flag = 1
if bucket > size and queue > 0:
queue -= 1
bucket -= packet_size
sent_data.append([i, bucket, REJECTED, sent_packets, leak, queue])
elif leak >= packet_size:
leak = 0
queue -= 1
sent_packets += 1
sent_data.append([i, bucket, SENT, sent_packets, leak, queue])
else:
if not flag:
sent_data.append([
i, bucket, '--------', sent_packets, leak, queue])
else:
sent_data.append([
i, bucket, ACCEPTED, sent_packets, leak, queue])
bucket -= r
if queue > 0:
leak += r
elif queue == 0:
leak = 0
if bucket < 0:
bucket = 0
return (sent_packets, sent_data)
def token_bucket(r, size, input_rate, packet_size, time_lapse, packet_dates):
bucket = size
burst_period = float(float(size) / float(input_rate - r))
burst_size = input_rate * burst_period
sent_data = []
sent_packets = 0
r = r / 1000.0 # Converting r to milliseconds
for i in xrange(0, time_lapse + 1):
if i in packet_dates:
if bucket < packet_size:
sent_data.append([i, bucket, REJECTED, sent_packets])
else:
bucket -= packet_size
sent_packets += 1
sent_data.append([i, bucket, ACCEPTED, sent_packets])
else:
sent_data.append([i, bucket, '--------', sent_packets])
bucket += r
if bucket > size:
bucket = size
return (sent_packets, sent_data, burst_period, burst_size)
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument(
"--leaky", default=False, action="store_true",
help="set the bucket to leaky")
parser.add_argument(
"--bucket-size", type=float, default=5000.0, dest='bucket_size',
help="set the bucket size (in bytes) (default 5KB)")
parser.add_argument(
"--input-rate", type=float, default=10000000.0, dest='input_rate',
help="the rate at which packages arrive (in bytes per second) (default 10MB/s)")
parser.add_argument(
"--rate", type=float, default=100000.0,
help="the rate at which tokens arrive to the bucket (in bytes per second) (default 100KB/s)")
parser.add_argument(
"--packet-size", type=float, default=1000.0, dest='packet_size',
help="the size of each incoming packet (in bytes) (default 1KB)")
parser.add_argument(
"--time-lapse", type=int, default=100, dest='time_lapse',
help="the time_lapse in which the bucket functions (in millisecond) (default 100ms)")
parser.add_argument(
"--exec-speed", type=float, default=0.5, dest='exec_speed',
help="the execution speed of the simulation (in seconds) (default 0.5seconds/millisecond)")
# Set the packet array:
p_array = [1, 2, 3, 4, 5, 6, 30, 34, 36, 38, 50, 60, 80, 82, 84, 86,
88, 100]
parser.add_argument(
'--packet-dates', nargs='+', default=p_array, dest='packet_dates',
type=int,
help='Set of packet dates in milliseconds (default %s)' % p_array)
args = parser.parse_args()
if args.input_rate < args.rate:
print(bcolors.FAIL,
"The bucket token rate must be lower than the incomming" +
" traffic rate.", bcolors.ENDC)
elif not args.leaky:
sent_packets, sent_data, burst_period, burst_size = (
token_bucket(
args.rate, args.bucket_size, args.input_rate, args.packet_size,
args.time_lapse, args.packet_dates)
)
print("=" * 60)
print("Time | Bucket | Status | Number of Packs Sent")
print("=" * 60)
for data in sent_data:
if data[2] == ACCEPTED:
print(
bcolors.OKGREEN, str(data[0]) + 'ms', '|', data[1], '|',
data[2], '|', data[3], bcolors.ENDC)
elif data[2] == REJECTED:
print(bcolors.FAIL, str(data[0]) + 'ms', '|', data[1], '|',
data[2], '|', data[3], bcolors.ENDC)
else:
print('', str(data[0]) + 'ms', '|', data[1], '|',
data[2], '|', data[3])
time.sleep(args.exec_speed)
print("\nSENT PACKETS:", sent_packets)
print("BURST SIZE (in KB):", round(burst_size, 2))
print("BURST PERIOD (in seconds):", round(burst_period, 6))
print("=" * 60)
elif args.leaky:
sent_packets, sent_data = (
leaky_bucket(
args.rate, args.bucket_size, args.packet_size,
args.time_lapse, args.packet_dates)
)
print("=" * 60)
print("Time | Bucket | Status | Number of Packs Sent | Leack | Queue")
print("=" * 60)
for data in sent_data:
if data[2] == SENT:
print(bcolors.OKBLUE, str(data[0]) + 'ms', '|', data[1], '| ',
data[2], ' |', data[3], '|', data[4], '|', data[5],
bcolors.ENDC)
elif data[2] == REJECTED:
print(bcolors.FAIL, str(data[0]) + 'ms', '|', data[1], '|',
data[2], '|', data[3], '|', data[4], '|', data[5],
bcolors.ENDC)
elif data[2] == ACCEPTED:
print(bcolors.OKGREEN, str(data[0]) + 'ms', '|', data[1], '|',
data[2], '|', data[3], '|', data[4], '|', data[5],
bcolors.ENDC)
else:
print('', str(data[0]) + 'ms', '|', data[1], '|',
data[2], '|', data[3], '|', data[4], '|', data[5])
time.sleep(args.exec_speed)
print("\nSENT PACKETS:", sent_packets)
print("=" * 60)
if __name__ == "__main__":
main()