Book Image

Hands-On Reactive Programming with Python

By : Romain Picard
Book Image

Hands-On Reactive Programming with Python

By: Romain Picard

Overview of this book

Reactive programming is central to many concurrent systems, but it’s famous for its steep learning curve, which makes most developers feel like they're hitting a wall. With this book, you will get to grips with reactive programming by steadily exploring various concepts This hands-on guide gets you started with Reactive Programming (RP) in Python. You will learn abouta the principles and benefits of using RP, which can be leveraged to build powerful concurrent applications. As you progress through the chapters, you will be introduced to the paradigm of Functional and Reactive Programming (FaRP), observables and observers, and concurrency and parallelism. The book will then take you through the implementation of an audio transcoding server and introduce you to a library that helps in the writing of FaRP code. You will understand how to use third-party services and dynamically reconfigure an application. By the end of the book, you will also have learned how to deploy and scale your applications with Docker and Traefik and explore the significant potential behind the reactive streams concept, and you'll have got to grips with a comprehensive set of best practices.
Table of Contents (16 chapters)

Using S3 as storage

With an S3 service ready to use (either as a private Minio installation, or directly on AWS), it can now be used to store transcoded audio files instead of storing them directly on a filesystem. Amazon provides an SDK to use many AWS services from Python (S3, EC2, Elasticsearch, and so on). This SDK is open-source (https://github.com/boto/boto3), and available on PyPI in the boto3 package. This is the package that will be used to store the encoded files in the S3 database.

Several evolutions are needed to use S3 storage instead of the local filesystem:

  • Implementing an S3 driver
  • Returning FLAC data in the encode driver
  • Adding S3 information in the configuration file
  • Using the new driver in the application

These evolutions mainly consist of using a new driver in the application. So, the reactivity diagram of the application evolves to the following example...