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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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601
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14 class Process(subprocess.Popen):
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15 """why would you name a subprocess object Popen?"""
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16
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17 def __init__(self, *args, **kwargs):
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18 self.output = tempfile.SpooledTemporaryFile()
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19 subprocess.Popen.__init__(self, *args, **kwargs)
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596
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20
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21 def main(args=sys.argv[1:]):
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599
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22 """CLI"""
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596
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23
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600
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24 # available programs
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25 progs = {'yes': ["yes"],
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26 'ping': ['ping', 'google.com']}
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27
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28
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599
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29 # parse command line
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596
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30 usage = '%prog [options]'
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31 parser = argparse.ArgumentParser(usage=usage, description=__doc__)
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32 parser.add_argument("-t", "--time", dest="time",
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599
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33 type=float, default=4.,
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34 help="seconds to run for")
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35 parser.add_argument("-s", "--sleep", dest="sleep",
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596
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36 type=float, default=1.,
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600
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37 help="sleep this number of seconds between polling")
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38 parser.add_argument("-p", "--prog", dest='program',
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39 choices=progs.keys(),
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40 help="subprocess to run")
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41 # TODO parser.add_argument("--list-programs", help="list available programs")
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596
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42 options = parser.parse_args(args)
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43
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599
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44
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45 # select program
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600
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46 prog = progs[options.program]
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599
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47
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48 # start the main subprocess loop
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49 # TODO -> OO
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596
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50 output = tempfile.SpooledTemporaryFile()
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51 start = time.time()
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52 proc = subprocess.Popen(prog, stdout=output)
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599
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53 location = 0
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596
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54 while proc.poll() is None:
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599
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55 curr_time = time.time()
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56 run_time = curr_time - start
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57 if run_time > options.time:
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596
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58 proc.kill()
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599
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59 if options.sleep:
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60 time.sleep(options.sleep)
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61 output.seek(location)
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62 read = output.read()
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63 location += len(read)
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64 print ('[{}] {}\n{}'.format(run_time, read, '-==-'*10))
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596
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65
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66 # reset tempfile
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67 output.seek(0)
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68
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69 n_lines = len(output.read().splitlines())
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70 print ("{}: {} lines".format(subprocess.list2cmdline(prog), n_lines))
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71
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72 if __name__ == '__main__':
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73 main()
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