#Yahoo Finance API Commodities Capture Example

This application was developed for a job test to work in YouDo.

The goal is to capture five commodity prices from Yahoo Finance at a configurable regular time interval.

Technologies used

• Ruby 2.3.0
• Rails 4.2.6
• Redis
• SSE with Rails Live Stream technology
• minitest
• Capybara
• Jquery
• Twitter bootstrap

How it works

The application have a web page with the last commodities captured from the Yahoo API and a button to start the capture process. There is an input to configure the time to get new commodities from the API and a button to stop the process too. Every commodity the process collect, is shown in the screen. Errors are handled too, if the Yahoo API does not respond or respond with error or invalid json, an error message is shown in the screen.

Faced obstacles

• Tried to do integrations tests with SSE events with Capybara, Poltergeist and Capybara-webkit without success. Rails documentation does not provides a way to test the Live Stream. I was forced to abandon the idea of testing the SSE.
• I do not know much about finances, that's why I'm not sure if the data that I've got from the API is useful.
• To SSE thread does not lock the server and prevent new requests, I had to change development environment configs: config.cache_classes and config.eager_load to true.

Final considerations

Thank you for the challenge.