automatically test if the sandbox can show up

[chunhualiao]

Right now we have to manually check if the sandbox can show up when a tutorial is openned.

Ideally, we should test this automatically and be the first to know if our sandbox has problems. There are some online site availability testing tools. If a site/URL is not available , they will send out email notifications.

Can you take a look if we can leverage them?

[ouankou]

The following command can be used to test a websocket connection in FreeCC.
It connects the socket for 2s and disconnects automatically.

curl --include \
     --no-buffer \
     --max-time 2 \
     --header "Connection: Upgrade" \
     --header "Upgrade: websocket" \
     --header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \
     --header "Sec-WebSocket-Version: 13" \
     http://lab.freecompilercamp.org:5010/sessions/bsqkfeoq4uig0s27i4q0/ws/

If a sandbox works, the following welcome message should be shown.

Otherwise, it either shows nothing or other unexpected message.

By checking the output via grep, we can know whether the docker container works correctly.

We can either run a cron job to test FreeCC on our server periodically, or develop an app on some cloud service, such as Heroku, to monitor FreeCC.