Book Image

Python Programming Blueprints

By : Daniel Furtado, Marcus Pennington
Book Image

Python Programming Blueprints

By: Daniel Furtado, Marcus Pennington

Overview of this book

Python is a very powerful, high-level, object-oriented programming language. It's known for its simplicity and huge community support. Python Programming Blueprints will help you build useful, real-world applications using Python. In this book, we will cover some of the most common tasks that Python developers face on a daily basis, including performance optimization and making web applications more secure. We will familiarize ourselves with the associated software stack and master asynchronous features in Python. We will build a weather application using command-line parsing. We will then move on to create a Spotify remote control where we'll use OAuth and the Spotify Web API. The next project will cover reactive extensions by teaching you how to cast votes on Twitter the Python way. We will also focus on web development by using the famous Django framework to create an online game store. We will then create a web-based messenger using the new Nameko microservice framework. We will cover topics like authenticating users and, storing messages in Redis. By the end of the book, you will have gained hands-on experience in coding with Python.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Dedication
Contributors
Packt Upsell
Preface
Index

Exposing HTTP entrypoints


We will now create a new microservice responsible for handling HTTP requests. First of all, let's amend our imports in the service.py file:

from nameko.rpc import rpc, RpcProxy 
from nameko.web.handlers import http 

Beneath the KonnichiwaService we made earlier, insert the following:

class WebServer: 
 
    name = 'web_server' 
    konnichiwa_service = RpcProxy('konnichiwa_service') 
 
    @http('GET', '/') 
    def home(self, request): 
        return self.konnichiwa_service.konnichiwa() 

Notice how the follows a similar pattern to the KonnichiwaService. It has a name attribute and a method decorated in order to expose it as an entrypoint. In this case, it is decorated with the http entrypoint. We specify inside the http decorator that it is a GET request and the location of that request - in this case, the root of our website.

There is also one more crucial difference: This service holds a reference to the Konnichiwa Service via an RpcProxy object. RpcProxy allows...