Wattx-challenge-top-coins

Full description of a challenge is available here

Architecture

Full solution consists of several services:

• API
• pricelist
• rank
• price

API service accept HTTP requests with json and csv headers and provides corresponding responces. pricelist serves gRPC calls from API, this also rules cached results. It has its own database with prepared results. rank service drains data from https://min-api.cryptocompare.com/. This service contains all the data about ranks. price service drains data from https://coinmarketcap.com/api/. This service contains all the data about prices.

Client request -> 
    API -> 
        pricelist ->
                request top_<limit> currencies  -> rank
                response top_<limit> currencies <- rank
                request prices for currencies   -> price
                prices for given currencies     <- price
            aggregate responses
        <- return pricelist data
    <- return compiled response

What I'd add if I have time:

- auto registrator service. It's already there, but I have some troubles with it.
- small fast database with support of TTL tailored to `pricelist` service for cache
- healthchecks across the infrastructure

How to start:

Make sure you have docker, docker-compose and make installed.

Clone repository:

git clone https://github.com/filatovw/Wattx-challenge-top-coins.git
cd Wattx-challenge-top-coins 

Download images:

make pull

Start infrastructure:

make infra

Rollout configs:

make configure

Start services:

make restart

Watch logs:

make logs

Get report in CSV:

curl -X GET "http://0.0.0.0:8667/?limit=100" -H "content-type:text/csv"

Get report in JSON:

curl -X GET "http://0.0.0.0:8667/?limit=100" -H "content-type:application/json"

or

curl -X GET "http://0.0.0.0:8667/?limit=100"