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596
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1 #!/usr/bin/env python
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2
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3 """
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4 multiprocessing/subprocess experiments
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5 """
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6
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7 import argparse
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8 import os
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9 import subprocess
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10 import sys
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11 import time
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12 import tempfile
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13
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599
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14 progs = {'yes': ["yes"],
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15 'ping': ['ping', 'google.com']}
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596
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16
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17 def main(args=sys.argv[1:]):
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599
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18 """CLI"""
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596
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19
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599
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20 # parse command line
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596
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21 usage = '%prog [options]'
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22 parser = argparse.ArgumentParser(usage=usage, description=__doc__)
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23 parser.add_argument("-t", "--time", dest="time",
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599
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24 type=float, default=4.,
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25 help="seconds to run for")
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26 parser.add_argument("-s", "--sleep", dest="sleep",
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596
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27 type=float, default=1.,
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599
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28 help="")
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596
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29 options = parser.parse_args(args)
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30
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599
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31
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32 # select program
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33 prog = progs['ping']
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34
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35 # start the main subprocess loop
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36 # TODO -> OO
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596
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37 output = tempfile.SpooledTemporaryFile()
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38 start = time.time()
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39 proc = subprocess.Popen(prog, stdout=output)
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599
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40 location = 0
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596
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41 while proc.poll() is None:
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599
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42 curr_time = time.time()
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43 run_time = curr_time - start
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44 if run_time > options.time:
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596
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45 proc.kill()
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599
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46 if options.sleep:
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47 time.sleep(options.sleep)
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48 output.seek(location)
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49 read = output.read()
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50 location += len(read)
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51 print ('[{}] {}\n{}'.format(run_time, read, '-==-'*10))
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596
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52
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53 # reset tempfile
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54 output.seek(0)
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55
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56 n_lines = len(output.read().splitlines())
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57 print ("{}: {} lines".format(subprocess.list2cmdline(prog), n_lines))
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58
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59 if __name__ == '__main__':
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60 main()
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