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#!/usr/bin/env python
from __future__ import unicode_literals
import os
from os.path import abspath, exists
import subprocess
import stat
import signal
# Local imports
from .grader import TimeoutException
class BaseEvaluator(object):
"""Base Evaluator class containing generic attributes
and callable methods"""
def __init__(self):
pass
def check_code(self):
raise NotImplementedError("check_code method not implemented")
def compile_code(self):
pass
def _run_command(self, cmd_args, *args, **kw):
"""Run a command in a subprocess while blocking, the process is killed
if it takes more than 2 seconds to run. Return the Popen object, the
stdout and stderr.
"""
try:
proc = subprocess.Popen(cmd_args,
preexec_fn=os.setpgrp, *args, **kw)
stdout, stderr = proc.communicate()
except TimeoutException:
# Runaway code, so kill it.
os.killpg(os.getpgid(proc.pid), signal.SIGKILL)
# Re-raise exception.
raise
return proc, stdout.decode('utf-8'), stderr.decode('utf-8')
def _remove_null_substitute_char(self, string):
"""Returns a string without any null and substitute characters"""
stripped = ""
for c in string:
if ord(c) != 26 and ord(c) != 0:
stripped = stripped + c
return ''.join(stripped)
def create_submit_code_file(self, file_name):
""" Set the file path for code (`answer`)"""
submit_path = abspath(file_name)
if not exists(submit_path):
submit_f = open(submit_path, 'w')
submit_f.close()
return submit_path
def write_to_submit_code_file(self, file_path, user_answer):
""" Write the code (`answer`) to a file"""
submit_f = open(file_path, 'w')
submit_f.write(user_answer.lstrip())
submit_f.close()
def _set_file_as_executable(self, fname):
os.chmod(fname, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR |
stat.S_IRGRP | stat.S_IWGRP | stat.S_IXGRP | stat.S_IROTH |
stat.S_IWOTH | stat.S_IXOTH)
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