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MIT 6.470 sample grading endpoint

This repository contains all the infrastructure needed to grade CSS and JavaScript problems, together with sample code for a few problems. The actual problems used in 6.470 hackathons are not provided.

Pre-requisites

The grading endpoint is built on Ruby 1.9.3 and uses the Bundler gem to manage its dependencies. The endpoint uses Xvfb to run the Chromium browser in server environments that do not have X servers. The grading endpoint also needs Chromium, or Google's slightly customized build, Google Chrome.

This code is tested on the following platforms.

  • Ubuntu 12.10
  • Fedora 18
  • Max OSX 10.8

The sections below contain setup instructions for each supported platform.

Ubuntu 12.10

Get Ruby, Bundler, and Xvfb.

sudo apt-get install ruby-full xvfb
sudo gem install bundler

Get Google Chrome.

wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
sudo sh -c "echo \"deb https://dl.google.com/linux/deb/ stable main\" > /etc/apt/sources.list.d/google.list"
sudo apt-get -qq update && sudo apt-get -qq install google-chrome-stable

Fedora 17+

Get Ruby, Bundler, and Xvfb.

sudo yum install ruby xorg-x11-server-Xvfb
sudo gem install bundler

Get Google Chrome.

wget -q https://dl-ssl.google.com/linux/linux_signing_key.pub
sudo rpm --import linux_signing_key.pub
rm linux_signing_key.pub
sudo sh -c "echo \"[google-chrome]\" > /etc/yum.repos.d/google-chrome.repo"
sudo sh -c "echo \"name=google-chrome\" >> /etc/yum.repos.d/google-chrome.repo"
sudo sh -c "echo \"baseurl=https://dl.google.com/linux/chrome/rpm/stable/\\\$basearch\" >> /etc/yum.repos.d/google-chrome.repo"
sudo sh -c "echo \"enabled=1\" >> /etc/yum.repos.d/google-chrome.repo"
sudo sh -c "echo \"gpgcheck=1\" >> /etc/yum.repos.d/google-chrome.repo"
sudo yum install google-chrome-stable

Mac OSX 10.7+

Install the Homebrew package manager.

ruby -e "$(curl -fsSkL raw.github.com/mxcl/homebrew/go)"
# Follow the instructions to get Homebrew installed

Get Ruby and Bundler.

brew install ruby
gem install bundler

Install Google Chrome from the official download site.

NOTE: OSX 10.7 and 10.8 come with Ruby 1.8.7, which is very old and not supported by this codebase. You do not need to use Homebrew to get Ruby 1.9.3, if you're willing to do some research.

Setup

Get the code and the libraries.

git clone http://git.pwnb.us/csail/mit6470-grader-sample.git
cd mit6470-grader-sample
bundle install

Start a development instance at http://localhost:9000/.

bundle exec foreman start

Production Deployment

First off, it's probably a good idea to start the production instance on your development machine and do a smoke test.

bundle exec foreman start --port 9500 --procfile Procfile.prod

The production setup is very similar to the development setup, except that you should set up the grading endpoint as a system daemon, instead of starting it manually.

sudo foreman export upstart /etc/init --procfile Procfile.prod --user $USER --port 12300

Problem Development.

Read the code behind the sample problems in the the problem directory.

The docs for webkit_remote and docs for webkit_remote_unstable can help understand and write problem code.

Copyright

Copyright (c) 2012 Victor Costan. See LICENSE.txt for further details.