Hexagonal Architecture / Ports and Adapter Kata

This is a kata on ports and adapters architecture. The task is to retrieve a list of weather observations on Iceland from the following API:

http://apis.is/weather/observations/en?stations=

and output the result into a CSV file of the following format:

id,name,date,time,temperature,pressure,wind_direction (optional)

The API documentation can be found here: http://docs.apis.is/#endpoint-weather

The goal is not to get this done as quickly as possible, but to follow the rules of ports and adapters architecture:

• The application itself does not depend directly on any external systems, but only on ports
• The protocol for a port is given by the purpose of the conversation it describes
• For each external system there is an ‘’adapter’’ that converts the API definition to the format needed by that system and vice versa

Now have some fun!