I tried to keep the api structure in such a way so that it be used to write both the admin site and general user site. Check TODO for new ideas.

Run the api server

• docker-compose up -d
• python manage.py migrate
• python manage.py runserver

Run celery and beat server

• celery -A ticket_world worker --loglevel=info
• celery -A ticket_world beat -l info

Celery tasks

I have wrote 3 celery periodic tasks :

• event_starter : every 1 minute this tries to make event status RUNNING
• event_stopper : every 1 minute it tries to invalidate, stopped or complete the event status.
• start_reservation_invalidator : tries to invalidate reservation if 15 minutes passed after creation without making actual payment.

I am using django-celery-beat. This extension enables you to store the periodic task schedule in the database. The periodic tasks can be managed from the Django Admin interface, where you can create, edit and delete periodic tasks and how often they should run. So we need to create these 3 tasks from admin panel.

Run tests

• python manage.py test --keepdb

TODO

• write more tests
• Implement avoid one - we can only buy tickets in a quantity that will not leave only 1 ticket
• Integrate flower for celery task monitoring.
• Lock all rows of reservations of an event during changing a status of single reservation.
• Query optimization in few areas.