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# IVLE - Informatics Virtual Learning Environment
# Copyright (C) 2007-2008 The University of Melbourne
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# Module: TutorialService
# Author: Matt Giuca
# Date: 25/1/2008
# Provides the AJAX backend for the tutorial application.
# This allows several actions to be performed on the code the student has
# typed into one of the exercise boxes.
# Calling syntax
# Path must be empty.
# The arguments determine what is to be done on this file.
# "exercise" - The path to a exercise file (including the .xml extension),
# relative to the subjects base directory.
# "code" - Full text of the student's code being submitted.
# "action". May be "test". (More to come).
# Returns a JSON response string indicating the results.
import os
import time
import cjson
from common import (db, util)
import test
import conf
def handle(req):
"""Handler for Ajax backend TutorialService app."""
# Set request attributes
req.write_html_head_foot = False # No HTML
if req.path != "":
req.throw_error(req.HTTP_BAD_REQUEST)
# Get all the arguments, if POST.
# Ignore arguments if not POST, since we aren't allowed to cause
# side-effects on the server.
fields = req.get_fieldstorage()
act = fields.getfirst('action')
exercise = fields.getfirst('exercise')
code = fields.getfirst('code')
if exercise == None or code == None or act == None:
req.throw_error(req.HTTP_BAD_REQUEST)
act = act.value
exercise = exercise.value
code = code.value
if act == "save":
handle_save(req, exercise, code, fields)
elif act == "test":
handle_test(req, exercise, code, fields)
elif act == "run":
handle_run(req, exercise, code, fields)
else:
req.throw_error(req.HTTP_BAD_REQUEST)
def handle_save(req, exercise, code, fields):
"""Handles a save action. This saves the user's code without executing it.
"""
# Need to open JUST so we know this is a real exercise.
# (This avoids users submitting code for bogus exercises).
exercisefile = util.open_exercise_file(exercise)
if exercisefile is None:
req.throw_error(req.HTTP_NOT_FOUND,
"The exercise was not found.")
exercisefile.close()
req.write('{"result": "ok"}')
conn = db.DB()
try:
conn.write_problem_save(
login = req.user.login,
exercisename = exercise,
date = time.localtime(),
text = code)
finally:
conn.close()
def handle_test(req, exercise, code, fields):
"""Handles a test action."""
exercisefile = util.open_exercise_file(exercise)
if exercisefile is None:
req.throw_error(req.HTTP_NOT_FOUND,
"The exercise was not found.")
# Parse the file into a exercise object using the test suite
exercise_obj = test.parse_exercise_file(exercisefile)
exercisefile.close()
# Run the test cases. Get the result back as a JSONable object.
# Return it.
test_results = exercise_obj.run_tests(code)
conn = db.DB()
try:
conn.insert_problem_attempt(
login = req.user.login,
exercisename = exercise,
date = time.localtime(),
complete = test_results['passed'],
attempt = code)
# Query the DB to get an updated score on whether or not this problem
# has EVER been completed (may be different from "passed", if it has
# been completed before), and the total number of attempts.
completed, attempts = conn.get_problem_status(req.user.login,
exercise)
test_results["completed"] = completed
test_results["attempts"] = attempts
req.write(cjson.encode(test_results))
finally:
conn.close()
def handle_run(req, exercise, code, fields):
"""Handles a run action."""
# Extremely makeshift.
# For now, just echo the code back
output = code
out_json = {"stdout": output}
req.write(cjson.encode(out_json))
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