Homework 05

Due Date: Tuesday, Apr 5, by 11:00am CDT

Back to the Flask

A database server (like Redis) is a critical addition to our applications for data persistence. In this short homework assignment, we will launch a Redis container, then build a small Flask app to load data into and retrieve data from the database.

PART 1

Launch a new containerized instance of a Redis database server using the stock redis:6 image. Be sure to:

Run the container in the background
Connect your assigned Redis port on ISP to the default Redis port inside the container
Mount a local folder to the /data folder inside the container for Redis to write its backups to
Configure the database server (as we did in class) to save to 1 backup file every 1 second

The command to do the above plus a description of what it is doing should be included in the README.

Tip

After creating the Redis container, do:

docker inspect <container ID> | grep IPAddress to find the IP (e.g. 172.xx.x.x)
Create the redis client in your Flask app as: redis.Redis(host='172.xx.x.x', port=6379)
Replace 172.xx.x.x with the actual IP you find in the first part
Use the default port 6379 when communicating over the docker bridge network
More info here

PART 2

Write a containerized Flask app with one route that handles both a POST and a GET request.

The route should be called /data
A POST request to /data should load some Meteorite Landings data into your Redis database instance
A GET request to /data should read the data out of Redis and return it as a JSON list
For bonus points, implement an optional start query parameter that takes an integer and returns the Meteorite Landing data starting at that index. Make sure to handle the case where start is provided but is not an integer!

Use the Meterorite Landing data found at this link:

https://raw.githubusercontent.com/wjallen/coe332-sample-data/main/ML_Data_Sample.json

Please include docstrings and type annotations in your Python3 code.

PART 3

A Dockerfile and a README should be included in your homework repository. The usual Dockerfile and README guidelines apply. Make sure to provide instructions to launch the Redis database, instructions to pull/build/launch the Flask app, instructions to perform POST and GET requests to your Flask app, and a description of the data.

What to Turn In

A sample Git repository may contain the following new files after completing homework 05:

my-coe332-hws/
├── homework01
│   └── ...
├── homework02
│   └── ...
├── ... etc
├── homework05
│   ├── Dockerfile               # your file names may vary
│   ├── app.py
│   └── README.md
└── README.md