Gru

Gru is an open source adaptive test system for screening candidates for software engineering roles. It helps us identify and recruit the right minions.

You can read more about why we built Gru on our blog. Gru uses Dgraph as the database.

Running

Gru has three components, Gru server, Dgraph(v0.7.5) as the database and Caddy as a web server.

Gru server

  # Make sure you have Go installed on the server (https://golang.org/doc/install).
  go get github.com/dgraph-io/gru
  cd $GOPATH/src/github.com/dgraph-io/gru
  go build .
  ./gru --user=<gru_ui_username> --pass=<gru_ui_password> --secret="<long_secret_to_sign_jwt_token>" --sendgrid="<sendgrid_api_key>" -ip "https://gru.dgraph.io" -debug=true 2>&1 | tee -a gru.log

• Note we use sendgrid for sending invite mails to the candidates. That won't work without the sendgrid key. For development purposes when the --sendgrid flag is empty, we just print out the invite link for taking the quiz to the console.
• The -ip flag is used to specify the ip address of the Gru server.

Dgraph

  wget https://github.com/dgraph-io/dgraph/releases/download/v0.7.5/dgraph-linux-amd64-v0.7.5.tar.gz
  tar -xzvf dgraph-linux-amd64-v0.7.5.tar.gz
  ./dgraph/dgraph

In case you are reloading data into Dgraph from an export, you can use dgraphloader to load the rdf.gz exported file.

Dgraph runs on port 8080 by default.

Caddy

Note, you should modify the the address on the first line of the admin/webUI/Caddyfile and also the value of hostname in admin/webUI/app/app.module.js to either http://localhost:2020 for the purposes of local development or to the address of your production server before running Caddy web server.

  mkdir caddy
  wget https://github.com/mholt/caddy/releases/download/v0.10.8/caddy_v0.10.8_linux_amd64.tar.gz
  tar -xzvf caddy_v0.10.8_linux_amd64.tar.gz
  ./caddy --conf ../admin/webUI/Caddyfile

After this Gru should be up and running for you. You can visit http://localhost:2020 (if running locally) and login. Go ahead and add some questions, create some quizzes and invite some candidates.