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Build Your Own Web Framework in Elixir

You're reading from   Build Your Own Web Framework in Elixir Develop lightning-fast web applications using Phoenix and metaprogramming

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Product type Paperback
Published in Jun 2023
Publisher Packt
ISBN-13 9781801812542
Length 274 pages
Edition 1st Edition
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Author (1):
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Aditya Iyengar Aditya Iyengar
Author Profile Icon Aditya Iyengar
Aditya Iyengar
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Table of Contents (15) Chapters Close

Preface 1. Part 1: Web Server Fundamentals
2. Chapter 1: Introducing the Cowboy Web Server FREE CHAPTER 3. Chapter 2: Building an HTTP Server in Elixir 4. Part 2: Router, Controller, and View
5. Chapter 3: Defining Web Application Specifications Using Plug 6. Chapter 4: Working with Controllers 7. Chapter 5: Adding Controller Plugs and Action Fallback 8. Chapter 6: Working with HTML and Embedded Elixir 9. Chapter 7: Working with Views 10. Part 3: DSL Design
11. Chapter 8: Metaprogramming – Code That Writes Code 12. Chapter 9: Controller and View DSL 13. Chapter 10: Building the Router DSL 14. Index

What is Plug?

Plug is an Elixir module that allows us to easily define the specifications of a web application. If you are from the Ruby world, you can think of Plug as somewhat like Rack, which allows us to define middleware to read and transform requests/responses in a web application.

Plug allows us to add middleware-like behavior by defining a set of composable operations on a connection struct, Plug.Conn. This allows us to define behavior in the form of a plug, which can transform the attributes of a Conn. Unlike in Rack, Conn contains information related to both the request and the response. This, along with Elixir’s |> operator, allows us to define the entire request-response cycle in a single pipeline of composable operations:

Figure 3.1 – Plug life cycle

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