retail_checkout

This is a small python 3.6 Flask RESTful API application that emulates the online-shopping checkout process based on a predefined business logic.

For development purposes the project uses the local file system to store the data but it has been coded in such way that other DBs such as mongo can be easily integrated by extending the data_access package and the DB_Factory class

Dependencies

• python 3.6
• pip
• Docker (only if you want to run the app using docker)

Run the tests

Clone the project and install the test requirements:

git clone https://github.com/ldcastell/retail_checkout.git
cd retail_checkout
pip install -r src/test_requirements.txt
cd src
export PYTHONPATH=`pwd`

Run the tests:

# from the src directory
pytest 

Understanding the default Configuration

Under src directory there is a config module which is essentially holding some default configurations. The app uses environment variables to override the configurations. some of the current supported environment variables and its default values are:

Variable	Default	Description	Supported Values
RETAIL_STORAGE_BACKEND	"local_fs"	the DB backend to use	"local_fs", ("mongo" in the future)
RETAIL_LOCAL_STORAGE_BASE_PATH	"/tmp/data"	only used if using local fs as DB	any valid directory path
RETAIL_API_PORT	5000	the port where the API will be served	any valid available port
RETAIL_API_LOG_LEVEL	"INFO"	The log level for the app logger	"INFO", "DEBUG", "ERROR", "CRITICAL"

Running the application

Locally running the app:

First install the python dependencies:

#from the retail_checkout directory
pip install -r src/requirements.txt

Now you can run the app locally using the local FS as DB by first setting some configurations like the data directory path:

#from the retail_checkout directory
export RETAIL_LOCAL_STORAGE_BASE_PATH=`pwd`/data

After that you can run the API and test the endpoints

# From the src directory
python retail_app.py

Running the app with docker

There is also support for Docker in order to run the app in docker you will first need to build the image using the provided Dockerfile

# to build the image with the default configuration run the following 
# command from the retail_checkout directory:
docker build -t retail_checkout_app:0.0.1 -f docker/Dockerfile .

Now you can run the app by executing the following command:

docker run -p 5000:5000 -t retail_checkout_app:0.0.1