1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
#!/usr/bin/env python
"""This server runs an XMLRPC server that can be submitted code and tests
and returns the output. It *should* be run as root and will run as the user
'nobody' so as to minimize any damange by errant code.
"""
import sys
from SimpleXMLRPCServer import SimpleXMLRPCServer
import pwd
import os
# Set the effective uid
nobody = pwd.getpwnam('nobody')
os.seteuid(nobody.pw_uid)
def run_code(answer, test_code, in_dir=None):
"""Tests given Python function (`answer`) with the `test_code` supplied.
If the optional `in_dir` keyword argument is supplied it changes the
directory to that directory (it does not change it back to the original when
done).
Returns
-------
A tuple: (success, error message).
"""
if in_dir is not None:
os.chdir(in_dir)
success = False
tb = None
try:
submitted = compile(answer, '<string>', mode='exec')
g = {}
exec submitted in g
_tests = compile(test_code, '<string>', mode='exec')
exec _tests in g
except AssertionError:
type, value, tb = sys.exc_info()
info = traceback.extract_tb(tb)
fname, lineno, func, text = info[-1]
text = str(test_code).splitlines()[lineno-1]
err = "{0} {1} in: {2}".format(type.__name__, str(value), text)
except:
type, value = sys.exc_info()[:2]
err = "Error: {0}".format(repr(value))
else:
success = True
err = 'Correct answer'
finally:
del tb
return success, err
def main():
server = SimpleXMLRPCServer(("localhost", 8001))
server.register_function(run_code)
server.serve_forever()
if __name__ == '__main__':
main()
|
