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'''
Created on Feb 4, 2013
@author: steger, jozsef
@organization: ELTE
@contact: steger@complex.elte.hu
'''
#TODO: nested command execution is not working properly: e.g.: echo `hostname`
from Driver import Driver
from subprocess import Popen, PIPE
class LocalExec(Driver):
'''
@summary: implements a driver to execute local commands
@ivar command: the default command
@type command: str
@ivar p: the process api
@type p: subprocess.Popen or None
'''
def __init__(self, command = "echo -n helloworld"):
'''
@summary: save a default command
@param command: the default command
@type command: str
'''
self.command = command
self.p = None
def __del__(self):
'''
@summary: an implicit deletion of the driver triggers a kill signal on a running process
'''
if self.p:
self.p.kill()
self.p = None
def execute(self, command = None):
'''
@summary: executes a local command
@param command: the command to run, if None, the default command is issued
@type command: str or None
@return: the standard output of the command run
@rtype: str
'''
if command is None:
command = self.command
self.p = Popen(args = command.split(' '), stdout = PIPE, stderr = PIPE)
stout, sterr = self.p.communicate()
self.p = None
self.logger.debug("executed '%s'" % (command))
if len(sterr):
self.logger.warning("execution '%s' failed: %s" % (command, sterr))
return stout
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