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README

Setting up

  1. This project assumes you're on Python3
  2. pip3 install -r requirements.txt
  3. Install and create postgres db + user.
  4. Update the DATABASE in settings.py with the step 3 info.
  5. python manage.py migrate
  6. python manage.py populate_exchange_rates
  7. python manage.py runserver
  8. Go to your browser and check http://127.0.0.1:8000/api/rates/ to see the expected output
  9. http://127.0.0.1:8000/api/rates/?currency=USD will give filtered output.
  10. Run pytest to run the tests.
  11. As a proper app, we would run celery too as such celery -A rator worker --loglevel=info

What is this about?

This app reads the RSS feeds for each currecy's exchange rate from https://www.ecb.europa.eu/home/html/rss.en.html, saves it into the database and exposes it via an API endpoint.

  • The database consists of a single table that stores the currency <-> rate mapping
  • All rates are equivalent to 1 EURO.
  • Contains a single endpoint with filters to fetch the exchange rates.

Improvements

  1. Celerybeat

The feeds are updated at 2.15PM. Need to figure out the timeone and setup celerybeat to run the task and update the exchange rates on a daily basis.

  1. Redis cache

Since the rates are updated only on a daily basis, setup redis cache with daily expiry to serve the exchange rates. Would probably use redis-py library to achieve this.

  1. urllib mocking

The tests now mock the requests call with the proper HTML response but mocks the feedparser.parse call directly since that was taking some time to figure out how to mock the correspoding urllib methods that feedparser uses underneath.