Microservices Lecture and Demo

See the notebook for all examples.

Justin A. Gould ([email protected])

January 2021

The notebook will provide examples of:

• Lecture on Microservices and APIs:
  • What are Microservices and APIs?
  • How to Create Microservices (in Python)
  • Demonstrations:
    • Modularized vs. non-modularized code
    • Calling demo microservices from a Flask app
      • You MUST run the Flask app (python3 app.py) for these example to work!
    • Calling Internal Packages in a Demo Notebook

What are Microservices and APIs?

IBM defines microservices (or microservices architecture) as: a cloud-native architectural approach in which a single application is composed of many loosely coupled and independently deployable smaller components, or services:

• Deployed and given an endpoint to accept an input payload and provide a response
• Microservices can communicate with one another via REST APIs
• Allows for code reuse by turning modularized code into a callable service

Microservice Architecture:

How to Create Microservices (in Python)

Creating microservices in Python is simple! All you need is modularized code, structured as a function (an example will follow below). From there, you can wrap your function into a Flask app, assign an endpoint (think of it as a URL) that accepts a given input to provide a desired output, and you're done.

Pipleline:

Green: get_data(table)

• Build SQL Alchemy query to retrive data from DB and return to user on screen

Red: add_row(table, row_list)

• Build SQL Alchemy query to add row_list as a row in table and commit changes to DB

Code Hierarchy:

• ./app.py: Flask application (run in your terminal via python3 app.py
• ./src/utils/example.py: File containing all functions used in demo