Carts Service

The Carts web service provides a RESTful API for adding, changing, and deleting shopping carts. The Web UI makes calls to this service as a user adds and removes items from their cart and during checkout.

When deployed to AWS, CodePipeline is used to build and deploy the Carts service as a Docker container to Amazon ECS behind an Application Load Balancer. The Carts service can also be run locally in a Docker container. This makes it easier to iterate on and test changes locally before commiting.

Local Development

foo@bar:~$ docker compose up --build -d carts

Once the container is up and running, you can access it in your browser or with a utility such as Postman at http://localhost:8003.

Testing

To run integration tests for the carts service a Python virtual environment and local dynamodb is required. You must have Python 3.8+ installed on your system to run the commands below. The commands are written to be ran from the test directory of the carts service (src/carts/test).

Run Tests

To run integration tests for the carts service a Python virtual environment is required. You must have Python 3.8+ installed on your system to run the commands below. The commands are written to be ran from the test directory of the carts service (src/carts/test).

The following command will create a virtual environment.

python3 -m venv .venv

Some environment variables are required to run the tests and need to be added to the virtual environment. The example below will work for local development. Change as required depending on environment.

echo '
export CARTS_API_URL="http://localhost:8003"
export TEST_USERNAME="user1344"'>> .venv/bin/activate

To activate and enter the virtual environment.

source .venv/bin/activate

To install requirements for the integration tests.

pip install -r integ/requirements.txt

To run the tests.

pytest integ/test_carts.py

You can exit the virtual environment with deactivate.

If you want to edit the request bodies for any of the PUT or POST request tests you can do so in json_request_bodies.json