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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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606
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14 string = (str, unicode)
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15
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601
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16 class Process(subprocess.Popen):
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17 """why would you name a subprocess object Popen?"""
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18
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606
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19 # http://docs.python.org/2/library/subprocess.html#popen-constructor
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20 defaults = {'buffsize': 1, # line buffered
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603
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21 }
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22
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606
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23 def __init__(self, command, **kwargs):
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24
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25 # setup arguments
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26 self.command = command
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27 _kwargs = self.defaults.copy()
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28 _kwargs.update(kwargs)
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29
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30 # output buffer
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31 self.output_buffer = tempfile.SpooledTemporaryFile()
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32 self.location = 0
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33 self.output = []
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34 _kwargs['stdout'] = self.output_buffer
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35
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36 # launch subprocess
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37 self.start = time.time()
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38 subprocess.Popen.__init__(self, *args, **_kwargs)
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39
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40 def wait(self, maxtime=None, sleep=1.):
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41 """
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42 maxtime -- timeout in seconds
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43 sleep -- number of seconds to sleep between polling
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44 """
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45 while self.poll() is None:
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46
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47 # check for timeout
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48 curr_time = time.time()
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49 run_time = curr_time - self.start
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50 if run_time > maxtime:
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51 # TODO: read from output
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52 return process.kill()
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53
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54 # naptime
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55 if sleep:
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56 time.sleep(sleep)
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57
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58 # read from output buffer
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59 self.output_buffer.seek(self.location)
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60 read = self.output_buffer.read()
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61 self.location += len(read)
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62
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63 def commandline(self):
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64 """returns string of command line"""
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65
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66 if isinstance(self.command, string):
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67 return self.command
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68 return subprocess.list2cmdline(self.command)
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69
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70 __str__ = commandline
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71
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596
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72
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73 def main(args=sys.argv[1:]):
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599
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74 """CLI"""
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596
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75
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600
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76 # available programs
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77 progs = {'yes': ["yes"],
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78 'ping': ['ping', 'google.com']}
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79
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80
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599
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81 # parse command line
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596
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82 usage = '%prog [options]'
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83 parser = argparse.ArgumentParser(usage=usage, description=__doc__)
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84 parser.add_argument("-t", "--time", dest="time",
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599
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85 type=float, default=4.,
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86 help="seconds to run for")
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87 parser.add_argument("-s", "--sleep", dest="sleep",
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596
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88 type=float, default=1.,
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600
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89 help="sleep this number of seconds between polling")
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90 parser.add_argument("-p", "--prog", dest='program',
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606
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91 choices=progs.keys(), default='ping',
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600
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92 help="subprocess to run")
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606
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93 parser.add_argument("--list-programs", dest='list_programs',
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94 action='store_true', default=False,
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95 help="list available programs")
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596
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96 options = parser.parse_args(args)
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97
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599
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98
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99 # select program
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600
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100 prog = progs[options.program]
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599
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101
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102 # start the main subprocess loop
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103 # TODO -> OO
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596
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104 output = tempfile.SpooledTemporaryFile()
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105 start = time.time()
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106 proc = subprocess.Popen(prog, stdout=output)
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599
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107 location = 0
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596
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108 while proc.poll() is None:
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599
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109 curr_time = time.time()
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110 run_time = curr_time - start
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111 if run_time > options.time:
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596
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112 proc.kill()
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599
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113 output.seek(location)
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114 read = output.read()
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115 location += len(read)
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116 print ('[{}] {}\n{}'.format(run_time, read, '-==-'*10))
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606
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117 if options.sleep:
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118 time.sleep(options.sleep)
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596
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119
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120 # reset tempfile
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121 output.seek(0)
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122
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123 n_lines = len(output.read().splitlines())
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124 print ("{}: {} lines".format(subprocess.list2cmdline(prog), n_lines))
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125
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126 if __name__ == '__main__':
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127 main()
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