Times each line of stdin

timeline

#!/usr/bin/env python

import time
from sys import stdin, stdout, argv, exit

try:
    if argv[1] == 'help' or argv[1] == '--help' or argv[1] == '-h':
        print "%s: times each line of stdin.\n  Optional parameter is a float of a threshold. (defaults to 2.0)" % argv[0]
        exit(255);
    else:
        threshold = argv[1]
except IndexError:
    threshold = 2.0

timeline_last = time.time()

while 1:
    try:
        line = stdin.readline()
    except KeyboardInterrupt:
        break

    if not line:
        break

    diff = time.time() - timeline_last
    
    if diff > threshold:
        indicator = '!'
    else:
        indicator = ' '

    print "[%s%0.2f] %s" % (indicator, diff, line.rstrip())
    timeline_last = time.time()
    stdout.flush()

usage example: puppet agent … | /path/to/timeline | tee /path/to/file.log