def import_captured(name, our_code=False):
"""
Import the module `name`, capturing stdout, and any exceptions that happen.
Returns the module, and a dict of results.
If `our_code` is true, then the code is edX-authored, and any exception output
can include full context. If `our_code` is false, then this is student-submitted
code, and should have only student-provided information visible in exception
traces. This isn't a security precaution, it just keeps us from showing confusing
and unhelpful information to students.
"""
result = {
'status': 'notrun',
}
try:
with graderutil.captured_stdout() as stdout:
mod = __import__(name)
except:
result['status'] = 'error'
if our_code:
exc = graderutil.format_exception()
else:
exc = graderutil.format_exception(main_file=name, hide_file=True)
result['exception'] = exc
mod = None
else:
result['status'] = 'ok'
result['stdout'] = stdout.getvalue()
return mod, result
def import_captured(name, our_code=False):
"""
Import the module `name`, capturing stdout, and any exceptions that happen.
Returns the module, and a dict of results.
If `our_code` is true, then the code is edX-authored, and any exception output
can include full context. If `our_code` is false, then this is student-submitted
code, and should have only student-provided information visible in exception
traces. This isn't a security precaution, it just keeps us from showing confusing
and unhelpful information to students.
"""
result = {
'status': 'notrun',
}
try:
with graderutil.captured_stdout() as stdout:
mod = __import__(name)
except:
result['status'] = 'error'
if our_code:
exc = graderutil.format_exception()
else:
exc = graderutil.format_exception(main_file=name, hide_file=True)
result['exception'] = exc
mod = None
else:
result['status'] = 'ok'
result['stdout'] = stdout.getvalue()
return mod, result
def run(grader_name, submission_name, seed=1):
"""
`grader_name`: importable module name of the grader
`submission_name`: importable module name of the submission
`seed`: A value to seed randomness with.
Returns a data structure:
{
'grader': {
'status': 'ok', # or 'error', 'nograder'
'stdout': 'whatever grader printed',
'exception': 'a stack trace if error'
},
'submission': {
'status': 'ok', # or 'error', 'caught'
'stdout': 'whatever the submission printed',
'exception': 'a stack trace if error'
},
'results': [
["Test short desc", "test detailed description", "test output..."],
...
],
'exceptions': 0, # or however many were caught.
}
"""
output = {
'grader': {
'status': 'notrun',
},
'submission': {
'status': 'notrun',
},
'results': [],
'exceptions': 0,
}
# Use a private random number generator, so student code won't accidentally
# mess it up. (if they mess it up deliberately, we don't care--it only
# hurts them).
gradelib.rand = random.Random(seed)
# Also seed the random singleton in case the exercise uses random numbers.
random.seed(seed + 1)
grader_mod, results = import_captured(grader_name, our_code=True)
if grader_mod:
try:
grader = grader_mod.grader
except:
results['status'] = 'error'
results['exception'] = graderutil.format_exception()
output['exceptions'] += 1
else:
output['exceptions'] += 1
output['grader'].update(results)
if output['grader']['status'] == 'ok':
submission, results = import_captured(submission_name)
output['submission'].update(results)
if submission and output['submission']['status'] == 'ok':
# results is a list of ("short description", "detailed desc", "output") tuples.
try:
for test in grader.tests():
with graderutil.captured_stdout() as test_stdout:
try:
exception_output = ""
test(submission)
except gradelib.EndTest:
grader.caught_end_test()
except:
# The error could be either the grader code or the submission code,
# so hide information.
exception_output = graderutil.format_exception(
main_file=submission_name, hide_file=True)
output['exceptions'] += 1
else:
exception_output = ""
# Get the output, including anything printed, and any exception.
test_output = test_stdout.getvalue()
if test_output and test_output[-1] != '\n':
test_output += '\n'
test_output += exception_output
output['results'].append(
(test.short_description, test.detailed_description,
test_output))
except:
output['grader']['status'] = 'error'
output['grader']['exception'] = graderutil.format_exception()
output['exceptions'] += 1
else:
output['exceptions'] += 1
if grader.uncaught_end_tests():
# We raised EndTest more than we caught them, the student must be
# catching them, inadvertently or not.
output['submission']['exception'] = _(
"Your code interfered with our grader. Don't use bare 'except' clauses."
)
output['submission']['status'] = 'caught'
return output
def run(grader_name, submission_name, seed=1):
"""
`grader_name`: importable module name of the grader
`submission_name`: importable module name of the submission
`seed`: A value to seed randomness with.
Returns a data structure:
{
'grader': {
'status': 'ok', # or 'error', 'nograder'
'stdout': 'whatever grader printed',
'exception': 'a stack trace if error'
},
'submission': {
'status': 'ok', # or 'error', 'caught'
'stdout': 'whatever the submission printed',
'exception': 'a stack trace if error'
},
'results': [
["Test short desc", "test detailed description", "test output..."],
...
],
'exceptions': 0, # or however many were caught.
}
"""
output = {
'grader': {
'status': 'notrun',
},
'submission': {
'status': 'notrun',
},
'results': [],
'exceptions': 0,
}
# Use a private random number generator, so student code won't accidentally
# mess it up. (if they mess it up deliberately, we don't care--it only
# hurts them).
gradelib.rand = random.Random(seed)
# Also seed the random singleton in case the exercise uses random numbers.
random.seed(seed+1)
grader_mod, results = import_captured(grader_name, our_code=True)
if grader_mod:
try:
grader = grader_mod.grader
except:
results['status'] = 'error'
results['exception'] = graderutil.format_exception()
output['exceptions'] += 1
else:
output['exceptions'] += 1
output['grader'].update(results)
if output['grader']['status'] == 'ok':
submission, results = import_captured(submission_name)
output['submission'].update(results)
if submission and output['submission']['status'] == 'ok':
# results is a list of ("short description", "detailed desc", "output") tuples.
try:
for test in grader.tests():
with graderutil.captured_stdout() as test_stdout:
try:
exception_output = ""
test(submission)
except gradelib.EndTest:
grader.caught_end_test()
except:
# The error could be either the grader code or the submission code,
# so hide information.
exception_output = graderutil.format_exception(main_file=submission_name, hide_file=True)
output['exceptions'] += 1
else:
exception_output = ""
# Get the output, including anything printed, and any exception.
test_output = test_stdout.getvalue()
if test_output and test_output[-1] != '\n':
test_output += '\n'
test_output += exception_output
output['results'].append((test.short_description, test.detailed_description, test_output))
except:
output['grader']['status'] = 'error'
output['grader']['exception'] = graderutil.format_exception()
output['exceptions'] += 1
else:
output['exceptions'] += 1
if grader.uncaught_end_tests():
# We raised EndTest more than we caught them, the student must be
# catching them, inadvertently or not.
output['submission']['exception'] = _("Your code interfered with our grader. Don't use bare 'except' clauses.")
output['submission']['status'] = 'caught'
return output