Shopping Cart Microservice

This is a Go REST API microservice for a typical shopping cart. The microservice has the following routes:

#	HTTP Method	Endpoint	Description
1	GET	/	Base route
2	GET	/items	Returns a list of cart items
3	POST	/items	Creates a new cart item
4	GET	/item/{id}	Returns an item with the given id
5	PUT	/item/{id}	Updates an item with the given id
6	DELETE	/item/{id}	Removes an item from the cart with the given id

Running the app

To run the code, you need to build the application first. Run the command below to build the executable:

go get && go build

Now, run the executable:

./main

Building the Docker image

To build the docker image, navigate to the root directory of the repo and run the command below:

docker build -t <your name>/shopping-cart-microservice .

Replace with your dockerhub username. If you are pushing to a different registry, you might want to remove the section entirely.

After building the image, you can run it using the command below:

docker run -p 8081:8080 <your name>/shopping-cart-microservice

This builds a docker container and runs it with port 8081 forwarded. If you open localhost:8081, you should see Shopping Cart Microservice.

Deploying using Kubernetes

You can deploy the microservice using Kubernetes. First, you want to get Kubernetes running using Minikube, Kind, Docker Desktop, etc. Then, you'd want to apply the manifest. Run the command below to apply the manifest:

kubectl apply -f shopping-cart.yaml

This create a Kubernetes manifest and exposes port 8080 through a service.

Expose the deployment using this command:

kubectl expose deployment shopping-cart-deployment --type=LoadBalancer --port=80 --target-port=8080

Get the exposed URL using the command below:

minikube service shopping-cart-service --url