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Setting up Server

  1. CentOS 8 x86_64
  2. Install prerequisites
# root directory
./prerequisites
  1. Start Apache Web Server & MariaDB Server
sudo systemctl enable httpd
sudo systemctl start httpd
sudo systemctl enable mariadb
sudo systemctl start mariadb
  1. gpg
# CodeSensor/tools
./init_gpg
  1. Database
  • Create database database_name
  • Add user user_name (pwd: user_password ) to database database_name
# CodeSensor/tools
sudo /usr/bin/mysql_secure_installation
mysql -h localhost -u root -p;

CREATE USER 'user_name'@'localhost' IDENTIFIED BY 'user_password';
CREATE DATABASE database_name;
GRANT ALL PRIVILEGES ON database_name .* TO 'user_name'@'localhost';
FLUSH PRIVILEGES;
  • Initialze tables for database_name
# CodeSensor/tools
sudo mysql -u user_name -p database_name < db_schema.sql
python3 init_mysql.py database_name user_name user_password
  • Edit CodeSensor/tools/DBLoader_nodejs/student_roster.txt to add user accounts for CodeSensor
    • Each row contains an ID, NAME pair for each account
  • Load user accounts to DB
# Codesensor/tools/DBLoader_nodejs
sudo npm install npm -g
npm install
node dbloader.js
- The default password is 'algo'+ID
- Password hash can be manually generated by the tool 
*Codesensor/tools/DBLoader_nodejs/gen_password_hash.js*
  1. Selinux
# CodeSensor/selinux policy
ln -sf /usr/share/selinux/devel/Makefile
make
sudo semodule -i codesensor.pp
  1. Firewall
sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
sudo firewall-cmd --reload
  1. https support

Directory Layout

Path Files
/usr/bin/HomeworkInspector/<HW_NAME> Executables and scripts are put here
/homeworks_workplace Working directory for the compilation and execution of submitted code
/var/homeworks/<HW_NAME> Submitted source code and analysis result are put here
/var/www/html/<HW_NAME> Webpages for the homework

Upload Homeworks

  1. Homework config & data
  • go to CodeSensor/HomeworkCodes
  • make a folder <HW_NAME> and follow the structure below
<HW_NAME>
│   homework_inspector_config
│
└── skeleton
    │ data.hpp
    │ input.txt
    │ output.txt.gold
    │ verifier.py
    │ verify.sh
    │ hidden_data.hpp (optional)
    │ hidden_input.txt (optional)
    │ hidden_output.txt.gold (optional)
  • modify homework_inspector_config to change the deadline, illegal headers, homework title and description
  • input.txt and output.txt.gold are the input and correct output for the homework
  • verifier.py checks the correctness of the answer
  • data.hpp has struct for storing the input data, load_data(...) function to read in the input data and store it in the struct, and SHM_NAME to distinguish the names of shared memory in the OS
  • hidden_data.hpp, hidden_input.txt and hidden_output.txt.gold are for code re-evaluation, they have the same purposes as the non-hidden ones, but have different test data
  • be sure to change hidden_data.hpp's SHM_NAME if it's copied from data.hpp
  • check out 2021_hw0_copy_paste or 2021_hw1_sort_text for some examples
  1. Upload to website
  • install homework
# root directory
sudo ./install <HW_NAME>
  • change the links in CodeSensor/web_frontpage/index.html
  • install webpage
# root directory
sudo ./install_webpage
  • make the submitted code public
sudo /usr/bin/HomeworkInspector/<HW_NAME>/TextToImage.php
  • uninstall homework
# root directory
sudo ./uninstall <HW_NAME>

Re-evaluate uploaded codes

  • log in to the website using baseline account
  • click "re-evaluation link" in Submit tab
  • click "Re-eval All" button to re-evaluate all the codes using hidden test data, or click "Re-eval <ID>" button for individual user
  • "move results" button to replace all the old results with the newly generated results