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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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610
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20 defaults = {'bufsize': 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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607
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30 # on unix, ``shell={True|False}`` should always come from the
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31 # type of command (string or list)
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609
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32 if not subprocess.mswindows:
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607
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33 _kwargs['shell'] = isinstance(command, string)
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34
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606
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35 # output buffer
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36 self.output_buffer = tempfile.SpooledTemporaryFile()
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37 self.location = 0
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610
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38 self.output = ''
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606
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39 _kwargs['stdout'] = self.output_buffer
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40
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41 # launch subprocess
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42 self.start = time.time()
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607
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43 subprocess.Popen.__init__(self, command, **_kwargs)
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606
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44
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45 def wait(self, maxtime=None, sleep=1.):
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46 """
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47 maxtime -- timeout in seconds
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48 sleep -- number of seconds to sleep between polling
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49 """
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50 while self.poll() is None:
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51
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52 # check for timeout
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53 curr_time = time.time()
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54 run_time = curr_time - self.start
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55 if run_time > maxtime:
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56 # TODO: read from output
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57 return process.kill()
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58
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607
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59 # read from output buffer
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610
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60 read = self.read()
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607
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61
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606
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62 # naptime
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63 if sleep:
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64 time.sleep(sleep)
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65
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608
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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 return self.returncode # set by ``.poll()``
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606
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70
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610
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71 def read(self):
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72 """read from the output buffer"""
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73 self.output_buffer.seek(self.location)
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74 read = self.output_buffer.read()
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75 self.output += read
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76 self.location += len(read)
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77 return read
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78
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606
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79 def commandline(self):
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80 """returns string of command line"""
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81
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82 if isinstance(self.command, string):
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83 return self.command
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84 return subprocess.list2cmdline(self.command)
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85
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86 __str__ = commandline
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87
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596
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88
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89 def main(args=sys.argv[1:]):
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599
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90 """CLI"""
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596
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91
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600
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92 # available programs
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93 progs = {'yes': ["yes"],
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94 'ping': ['ping', 'google.com']}
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95
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96
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599
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97 # parse command line
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596
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98 usage = '%prog [options]'
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99 parser = argparse.ArgumentParser(usage=usage, description=__doc__)
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100 parser.add_argument("-t", "--time", dest="time",
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599
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101 type=float, default=4.,
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102 help="seconds to run for")
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103 parser.add_argument("-s", "--sleep", dest="sleep",
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596
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104 type=float, default=1.,
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600
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105 help="sleep this number of seconds between polling")
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106 parser.add_argument("-p", "--prog", dest='program',
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606
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107 choices=progs.keys(), default='ping',
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600
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108 help="subprocess to run")
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606
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109 parser.add_argument("--list-programs", dest='list_programs',
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110 action='store_true', default=False,
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111 help="list available programs")
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596
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112 options = parser.parse_args(args)
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113
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608
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114 # list programs
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115 if options.list_programs:
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116 for key in sorted(progs.keys()):
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117 print ('{}: {}'.format(key, subprocess.list2cmdline(progs[key])))
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610
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118 sys.exit(0)
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599
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119
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120 # select program
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600
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121 prog = progs[options.program]
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599
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122
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608
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123 proc = Process(prog)
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596
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124
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608
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125 # # start the main subprocess loop
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126 # # TODO -> OO
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127 # output = tempfile.SpooledTemporaryFile()
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128 # start = time.time()
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129 # proc = subprocess.Popen(prog, stdout=output)
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130 # location = 0
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131 # while proc.poll() is None:
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132 # curr_time = time.time()
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133 # run_time = curr_time - start
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134 # if run_time > options.time:
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135 # proc.kill()
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136 # output.seek(location)
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137 # read = output.read()
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138 # location += len(read)
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139 # print ('[{}] {}\n{}'.format(run_time, read, '-==-'*10))
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140 # if options.sleep:
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141 # time.sleep(options.sleep)
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142
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143 # # reset tempfile
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144 # output.seek(0)
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596
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145
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146 n_lines = len(output.read().splitlines())
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147 print ("{}: {} lines".format(subprocess.list2cmdline(prog), n_lines))
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148
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149 if __name__ == '__main__':
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150 main()
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