NB: Exact replica from the book: Asynchronous Event Handling Using Microservices and Kafka

In this milestone:

1. a Go microservice was created called Order
2. a Go function for publishing events to a Kafka topic was created called PublishEvent

I was able to test all of the code created in this milestone on my local machine. The instructions below assume you are running on your local machine. I implemented this on a Mac, so references to the command-line will show as a UNIX shell.

1. Kafka and Zookeeper need to be running
2. The OrderReceived topic should be created
3. The Order service needs to be running (assumes you are in the milestone2/code folder)
   1. If this is the first time you are running this code, you will need to setup Go modules
      1. In your ~/.bash_profile, make sure you have the following ENV var set: export GO111MODULE=on and make sure the file is sourced.
      2. Initialize Go modules

         $ go mod init

         $ go mod tidy

   2. Run the Order service

      $ go run order/main.go

4. Send a HTTP request to the order service:

   $ curl -v -H "Content-Type: application/json" -d '{"id":"6e042f29-350b-4d51-8849-5e36456dfa48","products":[{"productCode":"12345","quantity":2}],"customer":{"firstName":"Tom","lastName":"Hardy","emailAddress":"[email protected]","shippingAddress":{"line1":"123 Anywhere St","city":"Anytown","state":"AL","postalCode":"12345"}}}' http://localhost:8080/orders

5. You should see output in the console of the order service, and no errors. You can also check the contents of the OrderReceived topic in Kafka.

   $ $KAFKA_HOME/bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic OrderReceived --from-beginning