The Challenge

Your task is to build an app which reads customer data from a CSV file (customers.csv) and sends out reminders of unsettled invoices based on the specified schedule. The schedule's values are offsets relative to the first message being sent. To send a message make a POST request to the commservice's /messages endpoint. It expects the message to be JSON encoded in the request body and contain the customer's email and message's text, e.g. look like

{
    "email": "user@mail.com",
    "text": "hello user"
}

If the communication service has been able to decode the message successfully, it responds with a 201 HTTP status code. It is possible that a customer settles an invoice. In this case, the communication service's JSON encoded response body additionally contains {"paid": true} and the customer shouldn't receive any additional messages. After your service has sent out all messages terminate the commservice to get a report.

Develop

Requiremets:

https://github.com/golang/dep

For tests testify/assert framework is used.

All artifacts are placed inside /bin/<platform>/ directory. Supported platforms are darwin and linux.

Install

make install

How to build

make build

Run tests

make test

Clear environment

make clean

Run

start corresponding commservice and then execute built artefact:

./commservice/commservice.mac

./bin/darwin/reminder -commservice-host=http://localhost:9090 -schedule-path=./fixtures/customers.csv