I have the following code to run a shell command and kill it if it
does not return within a certain amount of time:
def run_with_time_limit(command, limit):
"""Run the given command via a shell.
Kill the command, and raise an exception, if the
execution time exceeds <limit> seconds.
Else return (exit_code, stdout, stderr, duration)."""
class Alarm(Exception):
pass
def alarm_handler(signum, frame):
raise Alarm
start_stamp = time.time()
signal.signal(signal.SIGALRM, alarm_handler)
signal.alarm(limit)
try:
process = subprocess.Popen(
command,
stderr=subprocess.PIPE,
stdout=subprocess.PIPE,
shell=True)
stdout, stderr = process.communicate()
duration = time.time() - start_stamp
signal.alarm(0) # reset the alarm
except Alarm:
process.kill()
raise Alarm("The command did not return within %(limit)s
seconds." % locals())
return (process.returncode, stdout, stderr, duration)
run_with_time_limit("sleep 2", 1)
This works as desired.
But, I'd like to expand this to take some generic code, not just a
shell command, and terminate it if it does not return quickly.
@time_limiter
def generic_function(arg1, arg2, time_limit=10):
do_some_stuff()
do_some_other_stuff()
return val1, val2
If generic_function does not finish within 10 seconds it would stop
executing and throw an exception.
May I have some hints, please?
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