Quotes API

How to use

Given the service is running on the localhost (see the next "How to run" section) you can issue a GET request in the following format:

curl http://localhost:5000/api/quote?from_currency_code=USD&amount=100&to_currency_code=EUR

If your host IP and/or port differ then substitute accordingly

 docker build . -t svlasov/quotes_api:latest
 docker run -it -p 5000:5000 svlasov/quotes_api:latest

Install prerequisites Python 3.8 (probably should work with other 3+ versions)

Install requirements:

pip install -r requirements.txt

Run Flask app with default settings:

python -m flask run

Run Flask app in development + debug mode on port 8000

FLASK_ENV=development FLASK_DEBUG=1 python -m flask run --port=8000

Several dilemmas I had to resolve are around data feed polling strategy.

I took into considerations the following options:

sequentially poll all (both) providers in the web request thread
run a thread per provider and join them
run a scheduler which will poll providers and fill a storage (in-memory cache etc.) where latest values would be available on demand

For the sake of the exercise I've chosen a compromise variant: join on threads

While the task states there are only 2 providers I tried to get it to work with any amount of providers