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March 25, 2021 18:02
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compute load time stats for web page
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import os | |
import sys | |
import json | |
import pprint | |
import argparse | |
import subprocess | |
""" | |
Reference: https://blog.cloudflare.com/a-question-of-timing/ | |
Usage: | |
single url: | |
$> python3 ttfb.py -u www.zasag.mn | |
$> {'proctime_server': 0.266721, | |
'tcp_handshake': 0.421435, | |
'time_appconnect': 1.302903, | |
'time_connect': 0.423711, | |
'time_namelookup': 0.002276, | |
'time_starttransfer': 1.991059, | |
'ttfb': 0.688156} | |
single or multiple urls: | |
$> python3 ttfb.py -U www.zasag.mn | |
$> {'proctime_server': 0.266721, | |
'tcp_handshake': 0.421435, | |
'time_appconnect': 1.302903, | |
'time_connect': 0.423711, | |
'time_namelookup': 0.002276, | |
'time_starttransfer': 1.991059, | |
'ttfb': 0.688156} | |
$> python3 ttfb.py -U www.zasag.mn www.zasag.mn | |
{'proctime_server': 0.3054720000000001, | |
'tcp_handshake': 0.41525, | |
'time_appconnect': 1.270451, | |
'time_connect': 0.417553, | |
'time_namelookup': 0.002303, | |
'time_starttransfer': 1.991173, | |
'ttfb': 0.7207220000000001, | |
'url': 'www.zasag.mn'} | |
{'proctime_server': 0.30917799999999995, | |
'tcp_handshake': 0.400841, | |
'time_appconnect': 1.295195, | |
'time_connect': 0.403332, | |
'time_namelookup': 0.002491, | |
'time_starttransfer': 2.005214, | |
'ttfb': 0.710019, | |
'url': 'www.zasag.mn'} | |
multiple urls from file: | |
$> cat urls.txt | xargs python3 ttfb.py -U | |
{'proctime_server': 0.3054720000000001, | |
'tcp_handshake': 0.41525, | |
'time_appconnect': 1.270451, | |
'time_connect': 0.417553, | |
'time_namelookup': 0.002303, | |
'time_starttransfer': 1.991173, | |
'ttfb': 0.7207220000000001, | |
'url': 'www.zasag.mn'} | |
{'proctime_server': 0.30917799999999995, | |
'tcp_handshake': 0.400841, | |
'time_appconnect': 1.295195, | |
'time_connect': 0.403332, | |
'time_namelookup': 0.002491, | |
'time_starttransfer': 2.005214, | |
'ttfb': 0.710019, | |
'url': 'www.zasag.mn'} | |
""" | |
parser = argparse.ArgumentParser( | |
description="compute Time To First Byte (TTFB) for a given page" | |
) | |
parser.add_argument("-u", "--url", type=str, help="url to compute TTFB") | |
parser.add_argument("-U", "--urls", nargs="+", type=str, help="urls to compute TTFB") | |
args = parser.parse_args() | |
if args.url: | |
urls = [args.url] | |
elif args.urls: | |
urls = args.urls | |
else: | |
os.system("python3 ttfb.py -h") | |
sys.exit(1) | |
for url in urls: | |
result_raw = subprocess.run( | |
[ | |
"curl", | |
"--no-sessionid", | |
"-w", | |
'{"time_appconnect": %{time_appconnect}, ' | |
'"time_starttransfer": %{time_starttransfer}, ' | |
'"time_namelookup": %{time_namelookup}, ' | |
'"time_connect": %{time_connect}}', | |
"-H 'Cache-Control: no-cache'", | |
"-so", | |
"/dev/null", | |
url, | |
], | |
capture_output=True, | |
text=True, | |
) | |
result_dict = json.loads(result_raw.stdout) | |
result_dict["ttfb"] = ( | |
result_dict["time_starttransfer"] - result_dict["time_appconnect"] | |
) | |
result_dict["tcp_handshake"] = ( | |
result_dict["time_connect"] - result_dict["time_namelookup"] | |
) | |
result_dict["proctime_server"] = result_dict["ttfb"] - result_dict["tcp_handshake"] | |
result_dict["url"] = url | |
pprint.pprint(result_dict) |
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