Write a rest-service that listen on localhost:9090 for POST requests on /callback. Run the go service attached to this task. It will send requests to your service at a fixed interval of 5 seconds. The request body will look like this:
{
"object_ids": [1,2,3,4,5,6]
}
The amount of IDs varies each request. Expect up to 200 IDs.
Every ID is linked to an object whose details can be fetched from the provided
service. Our service listens on localhost:9010/objects/:id and returns the
following respone:
{
"id": <id>,
"online": true|false
}
Note that this endpoint has a unpredictable response time between 300ms and 4s!
- Your task is to request the object information for every incoming
object_idand filter the objects by theironlinestatus. - Store all objects in a postgres database along with a timestamp when the object was last seen.
- Let your service delete objects in the database when they have not been received for more than 30 seconds. Important: due to business constraints we are not allowed to miss any callback to our service. Write code in such a way that all errors are properly recovered and that the endpoint is always available. Optimize for very high throughput so that this service could work in production. Bonus:
- some comments in the code to explain the more complicated parts are appreciated
- it a nice bonus if you provide some way to setup the things needed for us to
test your code
The
tester_service.gois attached you need to use.