excute_java_file

# Not all imports are used
from __future__ import absolute_import

from celery import shared_task, current_task
from apps.common.util import kill_process
from django.conf import settings
from django.core.files.base import ContentFile
from django.core.files.storage import default_storage

import subprocess as sub
import os

def java_file(username, title, args, display_execution_time=False):
    execution_time = None
    if display_execution_time:
        command = [
            'time',
            '-p',
            'java',
            '-classpath',
            # str('%s/%s' % (settings.MEDIA_ROOT, path))
            str('%s/submissions/%s' % (settings.MEDIA_ROOT, username)),
            title
        ]
    else:
        command = [
            'java',
            '-classpath',
            # str('%s/%s' % (settings.MEDIA_ROOT, path))
            str('%s/submissions/%s' % (settings.MEDIA_ROOT, username)),
            title
        ]

    if args and len(args) > 0:
        command = command + args

    result = sub.Popen(
        command, stdout=sub.PIPE, stderr=sub.STDOUT).stdout.read()

    # Run the java command in another thread which will be killed after the timeout
    result = kill_process.RunCmd(command, 60).Run().stdout.read()

    # result is none when timeout occurs
    if result is None:
        return "Time out", execution_time

    if display_execution_time:
        start_index = result.rfind('real')
        end_index = result.rfind('user')
        # 4 is length of real, 9 is the number of spaces
        # e.g. output ---- '<output values>        0.21 real         0.10 user         0.03 sys\n'
        execution_time = result[start_index+4:end_index-1].strip(' \t\n\r')
        #result_index = result[:start_index].rfind('        ')
        result = result[0:start_index-1]

    return result, execution_time