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Flask REST API Clean Architecture Practice

A Clean Architecture Practice with Flask REST API.

This is a practice project I used to learn Clean Architecture by implementing the REST API with a full Authentication/Authorization Protocols, Dependency Injection and furthermore the Swagger documentation.

Basic Folder Structure

application.py

The major application declaration file.

apps

The Application Layer that defines API controller endpoint, global exceptions and also Request/Response/Presenter/Validator adapters.

config

Application Configuration files are here.

core

The core concept of the Clean Architecture practice. The kernel part is about the interface and abstract class definitions. The core part contains the business logic and the domains objects such as entity, value object, use case and also the repository.

extensions

Some configuration and plugins I used, to make the application itself cleaner.

infra

The Infrastructure Layer that provides the actual implementation of network, persistent, cache layer... etc.

tests

Test folder, not implemented yet.

Dependencies

  • flask: Base Web Framework
  • werkzeug: Utility Library under Flask
  • authlib: OpenID Connect Provider Library
  • flask-restplus = REST API, Swagger Library
  • flask-injector = Dependency Injection
  • attrs = Data Classes Utility LIbrary
  • cattrs = Serialization / Deserialization

Run the project

> pipenv sync

Enter Shell

> pipenv shell

Start App

> flask run

Sample API request

API Documentation

TODO Items for POC

  • Apply Clean Architecture
  • Layer Abstraction
  • Dependency Injection
  • UseCase Implementation
  • Serialization / Deserialization
  • Mock Repo Implementation
  • Handle Exceptions
  • Response Marshalling
  • Review usecase.execute() with Req/Resp
  • Review API Documentation
  • Implement Full Story with Entity, ValueObject
  • Request Validation with Marshmallow
  • Deal with Date/DateTime
  • Database with SQLAlchemy
  • Logging
  • OAuth2 with Authlib Implementation
  • Authentication to Resource API
  • Dev/Prod Configuration
  • Apply Tests
  • WSGI Settings

Reference