#!/usr/bin/python3
import re
import matplotlib.pyplot as plt

pattern = re.compile("cwnd:(\d+)")

with open("sslog.txt") as input_file, open("cwnd.txt", "w") as output_file:
    while True:
        ip = input_file.readline()
        info = input_file.readline()
        if not ip or not info: #  EOF
            break
        if "reno" not in info: #  Take only data connection
            continue
        for match in re.finditer(pattern, info):
            output_file.write(match.group(1) + "\n")