143 lines
3.9 KiB
Python
143 lines
3.9 KiB
Python
#!/usr/bin/python
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from subprocess import Popen, call, PIPE
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import time
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class Process(object):
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''' Represents a running/ran process '''
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@staticmethod
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def devnull():
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''' Helper method for opening devnull '''
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return open('/dev/null', 'w')
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@staticmethod
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def call(command):
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'''
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Calls a command (either string or list of args).
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Returns tuple:
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(stdout, stderr)
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'''
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if type(command) != str or ' ' in command:
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shell = True
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else:
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shell = False
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pid = Popen(command, stdout=PIPE, stderr=PIPE, shell=shell)
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pid.wait()
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return pid.communicate()
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@staticmethod
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def exists(program):
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''' Checks if program is installed on this system '''
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p = Process(['which', program])
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if p.stdout().strip() == '' and p.stderr().strip() == '':
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return False
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return True
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def __init__(self, command, devnull=False):
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''' Starts executing command '''
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if type(command) == str:
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# Commands have to be a list
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command = command.split(' ')
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self.command = command
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self.out = None
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self.err = None
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if devnull:
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sout = Process.devnull()
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serr = Process.devnull()
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else:
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sout = PIPE
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serr = PIPE
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self.start_time = time.time()
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self.pid = Popen(command, stdout=sout, stderr=serr)
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def __del__(self):
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'''
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Ran when object is GC'd.
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If process is still running at this point, it should die.
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'''
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if self.pid and self.pid.poll() == None:
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self.interrupt()
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def stdout(self):
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''' Waits for process to finish, returns stdout output '''
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self.get_output()
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return self.out
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def stderr(self):
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''' Waits for process to finish, returns stderr output '''
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self.get_output()
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return self.err
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def get_output(self):
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''' Waits for process to finish, sets stdout & stderr '''
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if self.pid.poll() == None:
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self.pid.wait()
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if self.out == None:
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(self.out, self.err) = self.pid.communicate()
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def poll(self):
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''' Returns exit code if process is dead, otherwise "None" '''
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return self.pid.poll()
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def running_time(self):
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''' Returns number of seconds since process was started '''
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return int(time.time() - self.start_time)
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def interrupt(self):
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'''
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Send interrupt to current process.
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If process fails to exit within 1 second, terminates it.
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'''
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from signal import SIGINT, SIGTERM
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from os import kill
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from time import sleep
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try:
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pid = self.pid.pid
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kill(pid, SIGINT)
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wait_time = 0 # Time since Interrupt was sent
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while self.pid.poll() == None:
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# Process is still running
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wait_time += 0.1
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sleep(0.1)
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if wait_time > 1:
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# We waited over 1 second for process to die
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# Terminate it and move on
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kill(pid, SIGTERM)
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self.pid.terminate()
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break
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except OSError, e:
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if 'No such process' in e.__str__():
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return
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raise e # process cannot be killed
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if __name__ == '__main__':
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p = Process('ls')
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print p.stdout(), p.stderr()
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p.interrupt()
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# Calling as list of arguments
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(out,err) = Process.call(['ls', '-lah'])
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print out,err
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print '\n---------------------\n'
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# Calling as string
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(out,err) = Process.call('ls -l | head -2')
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print out,err
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print '"reaver" exists:', Process.exists('reaver')
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# Test on never-ending process
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p = Process('yes')
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# After program loses reference to instance in 'p', process dies.
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