Book Image

Mastering Flask Web Development - Second Edition

By : Daniel Gaspar, Jack Stouffer
Book Image

Mastering Flask Web Development - Second Edition

By: Daniel Gaspar, Jack Stouffer

Overview of this book

Flask is a popular Python framework known for its lightweight and modular design. Mastering Flask Web Development will take you on a complete tour of the Flask environment and teach you how to build a production-ready application. You'll begin by learning about the installation of Flask and basic concepts such as MVC and accessing a database using an ORM. You will learn how to structure your application so that it can scale to any size with the help of Flask Blueprints. You'll then learn how to use Jinja2 templates with a high level of expertise. You will also learn how to develop with SQL or NoSQL databases, and how to develop REST APIs and JWT authentication. Next, you'll move on to build role-based access security and authentication using LDAP, OAuth, OpenID, and database. Also learn how to create asynchronous tasks that can scale to any load using Celery and RabbitMQ or Redis. You will also be introduced to a wide range of Flask extensions to leverage technologies such as cache, localization, and debugging. You will learn how to build your own Flask extensions, how to write tests, and how to get test coverage reports. Finally, you will learn how to deploy your application on Heroku and AWS using various technologies, such as Docker, CloudFormation, and Elastic Beanstalk, and will also learn how to develop Jenkins pipelines to build, test, and deploy applications.

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Table of Contents (15 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
Getting Started
Getting Started
Version control with Git
Python package management with pip
Dependency sandboxing with virtualenv
Setting up Docker
The beginning of our project
Summary
2
Creating Models with SQLAlchemy
Creating Models with SQLAlchemy
Setting up SQLAlchemy
Our first model
CRUD
Relationships between models
Constraints and indexing
The convenience of SQLAlchemy sessions
Database migrations with Alembic
Summary
3
Creating Views with Templates
Creating Views with Templates
Jinja's syntax
Creating our views
Flask WTForms
Summary
4
Creating Controllers with Blueprints
Creating Controllers with Blueprints
Sessions and globals
Request setup and teardown
Error pages
Class-based views
Blueprints
Summary
5
Advanced Application Structure
Advanced Application Structure
Modular application
Application factories
Summary
6
Securing Your App
Securing Your App
Authentication methods
Flask-Login overview
OpenID
OAuth
Role-based access control (RBAC)
Summary
7
Using NoSQL with Flask
Using NoSQL with Flask
Types of NoSQL database
RDBMS versus NoSQL
MongoDB in Flask
Leveraging the power of NoSQL
Summary
8
Building RESTful APIs
Building RESTful APIs
What is REST?
Setting up a RESTful Flask API
JWT authentication
Get requests
Post requests
Put requests
Delete requests
Summary
9
Creating Asynchronous Tasks with Celery
Creating Asynchronous Tasks with Celery
What is Celery?
Setting up Celery and RabbitMQ
Creating tasks in Celery
Running Celery tasks
Monitoring Celery
Creating a reminder app
Creating a weekly digest
Summary
10
Useful Flask Extensions
Useful Flask Extensions
Flask CLI
Flask Debug Toolbar
Flask Caching
Flask Assets
Flask Admin
Flask-Babel
Flask Mail
Summary
11
Building Your Own Extension
Building Your Own Extension
Creating a YouTube Flask extension
Modifying the response with Flask extensions
Summary
12
Testing Flask Apps
Testing Flask Apps
What are unit tests?
How does testing work?
Unit testing the application
User interface testing
Test coverage
Test-driven development
Summary
13
Deploying Flask Apps
Deploying Flask Apps
Web servers and gateway interfaces
Deploying on Heroku
Deploying on Amazon Web Services
Using Docker
Building and deploying highly available applications readily
Summary
14
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Web servers and gateway interfaces

In this section, we will make a quick introduction to the most commonly used web servers and Web Server Gateway Interfaces (WSGI), and their differences and configuration. A WSGI is an application-agnostic layer between the web server and the python application itself.

Gevent

The simplest option to get a web server up and running is to use a Python library, named gevent, to host your application. Gevent is a Python library that adds an alternative way of doing concurrent programming,called co-routines, outside of the Python threading library. Gevent has an interface to run WSGI applications that is both simple and has good performance. A simple gevent server can easily handle hundreds of...

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